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From r..@apache.org
Subject cvs commit: httpd-2.0/server/mpm/worker .cvsignore Makefile.in config5.m4 fdqueue.c fdqueue.h mpm.h mpm_default.h worker.c
Date Mon, 30 Jul 2001 05:02:53 GMT
rbb         01/07/29 22:02:53

  Modified:    .        CHANGES
               server/mpm config.m4
  Added:       server/mpm/worker .cvsignore Makefile.in config5.m4
                        fdqueue.c fdqueue.h mpm.h mpm_default.h worker.c
  Log:
  Add the worker MPM.  The name is probably horrible, but I couldn't come
  up with anything better.  This is a multiple-worker/single listener MPM.
  This MPM is definately not complete, but it is a first step in the
  right direction.
  
  Revision  Changes    Path
  1.263     +5 -0      httpd-2.0/CHANGES
  
  Index: CHANGES
  ===================================================================
  RCS file: /home/cvs/httpd-2.0/CHANGES,v
  retrieving revision 1.262
  retrieving revision 1.263
  diff -u -r1.262 -r1.263
  --- CHANGES	2001/07/28 23:39:06	1.262
  +++ CHANGES	2001/07/30 05:02:52	1.263
  @@ -1,5 +1,10 @@
   Changes with Apache 2.0.23
   
  +  *) Add a single listener/multiple worker MPM.  This MPM is
  +     definately not fully correct, but it allows us to solve many
  +     of the problems that exist in the threaded MPM.  This is a 
  +     modified version of the threaded MPM.  [Ryan Bloom]
  +
     *) Improve content generation throughout Apache, providing closer
        compliance with HTML 3.2, HTML 4.01 Transitional and XHTML 1.0
        Transitional specifications.  [William Rowe]
  
  
  
  1.36      +2 -2      httpd-2.0/server/mpm/config.m4
  
  Index: config.m4
  ===================================================================
  RCS file: /home/cvs/httpd-2.0/server/mpm/config.m4,v
  retrieving revision 1.35
  retrieving revision 1.36
  diff -u -r1.35 -r1.36
  --- config.m4	2001/05/05 08:02:17	1.35
  +++ config.m4	2001/07/30 05:02:53	1.36
  @@ -1,7 +1,7 @@
   AC_MSG_CHECKING(which MPM to use)
   AC_ARG_WITH(mpm,
   [  --with-mpm=MPM          Choose the process model for Apache to use.
  -                          MPM={beos,threaded,prefork,spmt_os2,perchild}],[
  +                          MPM={beos,worker,threaded,prefork,spmt_os2,perchild}],[
     APACHE_MPM=$withval
   ],[
     if test "x$APACHE_MPM" = "x"; then
  @@ -12,7 +12,7 @@
   
   apache_cv_mpm=$APACHE_MPM
   	
  -if test "$apache_cv_mpm" = "threaded" -o "$apache_cv_mpm" = "perchild"; then
  +if test "$apache_cv_mpm" = "threaded" -o "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "perchild"; then
     APR_CHECK_APR_DEFINE(APR_HAS_THREADS, srclib/apr)
   
     if test "x$ac_cv_define_APR_HAS_THREADS" = "xno"; then
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/.cvsignore
  
  Index: .cvsignore
  ===================================================================
  .deps
  .libs
  *.lo
  *.la
  Makefile
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/Makefile.in
  
  Index: Makefile.in
  ===================================================================
  
  LTLIBRARY_NAME    = libworker.la
  LTLIBRARY_SOURCES = worker.c fdqueue.c
  
  include $(top_srcdir)/build/ltlib.mk
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/config5.m4
  
  Index: config5.m4
  ===================================================================
  dnl ## XXX - Need a more thorough check of the proper flags to use
  
  if test "$MPM_NAME" = "worker" ; then
      APACHE_FAST_OUTPUT(server/mpm/$MPM_NAME/Makefile)
  fi
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/fdqueue.c
  
  Index: fdqueue.c
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * Portions of this software are based upon public domain software
   * originally written at the National Center for Supercomputing Applications,
   * University of Illinois, Urbana-Champaign.
   */
  
  #include "fdqueue.h"
  #include "apr_pools.h"
  
  /* Assumption: queue itself is allocated by the user */
  /* Assumption: increment and decrement are atomic on int */
  
  int ap_queue_size(FDQueue *queue) {
      return ((queue->tail - queue->head + queue->bounds) % queue->bounds);
  }
  
  int ap_queue_full(FDQueue *queue) {
      return(queue->blanks <= 0);
  }
  
  int ap_block_on_queue(FDQueue *queue) {
  #if 0
      if (pthread_mutex_lock(&queue->one_big_mutex) != 0) {
          return FD_QUEUE_FAILURE;
      }
  #endif
      if (ap_queue_full(queue)) {
          pthread_cond_wait(&queue->not_full, &queue->one_big_mutex);
      }
  #if 0
      if (pthread_mutex_unlock(&queue->one_big_mutex) != 0) {
          return FD_QUEUE_FAILURE;
      }
  #endif
      return FD_QUEUE_SUCCESS;
  }
  
  static int increase_blanks(FDQueue *queue) {
      queue->blanks++;
      return FD_QUEUE_SUCCESS;
  }
  
  static apr_status_t ap_queue_destroy(void *data) {
      FDQueue *queue = data;
      /* Ignore errors here, we can't do anything about them anyway */
      pthread_cond_destroy(&queue->not_empty);
      pthread_cond_destroy(&queue->not_full);
      pthread_mutex_destroy(&queue->one_big_mutex);
      return FD_QUEUE_SUCCESS;
  }
  
  int ap_queue_init(FDQueue *queue, int queue_capacity, apr_pool_t *a) {
      int i;
      int bounds = queue_capacity + 1;
      pthread_mutex_init(&queue->one_big_mutex, NULL);
      pthread_cond_init(&queue->not_empty, NULL);
      pthread_cond_init(&queue->not_full, NULL);
      queue->head = queue->tail = 0;
      queue->data = apr_palloc(a, bounds * sizeof(FDQueueElement));
      queue->bounds = bounds;
      queue->blanks = queue_capacity;
      apr_pool_cleanup_register(a, queue, ap_queue_destroy, apr_pool_cleanup_null);
      for (i=0; i < bounds; ++i)
          queue->data[i].sd = NULL;
      return FD_QUEUE_SUCCESS;
  }
  
  int ap_queue_push(FDQueue *queue, apr_socket_t *sd, apr_pool_t *p) {
      queue->data[queue->tail].sd = sd;
      queue->data[queue->tail].p  = p;
      queue->tail = (queue->tail + 1) % queue->bounds;
      queue->blanks--;
      pthread_cond_signal(&queue->not_empty);
  #if 0
      if (queue->head == (queue->tail + 1) % queue->bounds) {
  #endif
      if (ap_queue_full(queue)) {
          pthread_cond_wait(&queue->not_full, &queue->one_big_mutex);
      }
      return FD_QUEUE_SUCCESS;
  }
  
  apr_status_t ap_queue_pop(FDQueue *queue, apr_socket_t **sd, apr_pool_t **p, int block_if_empty) {
      increase_blanks(queue);
      /* We have just removed one from the queue.  By definition, it is
       * no longer full.  We can ALWAYS signal the listener thread at
       * this point.  However, the original code didn't do it this way,
       * so I am leaving the original code in, just commented out.  BTW,
       * originally, the increase_blanks wasn't in this function either.
       *
       if (queue->blanks > 0) {
       */
      pthread_cond_signal(&queue->not_full);
  
      /*    }    */
      if (queue->head == queue->tail) {
          if (block_if_empty) {
              pthread_cond_wait(&queue->not_empty, &queue->one_big_mutex);
          }
      } 
      
      *sd = queue->data[queue->head].sd;
      *p  = queue->data[queue->head].p;
      queue->data[queue->head].sd = NULL;
      if (*sd != NULL) {
          queue->head = (queue->head + 1) % queue->bounds;
      }
      return APR_SUCCESS;
  }
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/fdqueue.h
  
  Index: fdqueue.h
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * Portions of this software are based upon public domain software
   * originally written at the National Center for Supercomputing Applications,
   * University of Illinois, Urbana-Champaign.
   */
  
  #ifndef FDQUEUE_H
  #define FDQUEUE_H
  #include "httpd.h"
  #include <stdlib.h>
  #include <unistd.h>
  #include <pthread.h>
  #include <sys/types.h>
  #include <sys/socket.h>
  
  #define FD_QUEUE_SUCCESS 0
  #define FD_QUEUE_FAILURE -1 /* Needs to be an invalid file descriptor because
                                 of queue_pop semantics */
  
  typedef struct fd_queue_elem {
      apr_socket_t *sd;
      apr_pool_t *p;
  } FDQueueElement;
  
  typedef struct fd_queue {
      int head;
      int tail;
      FDQueueElement *data;
      int bounds;
      int blanks;
      pthread_mutex_t one_big_mutex;
      pthread_cond_t not_empty;
      pthread_cond_t not_full;
  } FDQueue;
  
  int ap_queue_init(FDQueue *queue, int queue_size, apr_pool_t *a);
  int ap_queue_push(FDQueue *queue, apr_socket_t *sd, apr_pool_t *p);
  apr_status_t ap_queue_pop(FDQueue *queue, apr_socket_t **sd, apr_pool_t **p, int block_if_empty);
  int ap_queue_size(FDQueue *queue);
  int ap_queue_full(FDQueue *queue);
  int ap_block_on_queue(FDQueue *queue);
  
  #endif /* FDQUEUE_H */
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/mpm.h
  
  Index: mpm.h
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * Portions of this software are based upon public domain software
   * originally written at the National Center for Supercomputing Applications,
   * University of Illinois, Urbana-Champaign.
   */
  #include "scoreboard.h"
  #include "unixd.h"
  
  #ifndef APACHE_MPM_WORKER_H
  #define APACHE_MPM_WORKER_H
  
  #define WORKER_MPM
  
  #define MPM_NAME "Worker"
  
  #define AP_MPM_NEEDS_RECLAIM_CHILD_PROCESSES 1
  #define MPM_SYNC_CHILD_TABLE() (ap_sync_scoreboard_image())
  #define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
  #define MPM_NOTE_CHILD_KILLED(i) (MPM_CHILD_PID(i) = 0)
  
  extern int ap_threads_per_child;
  extern int ap_max_daemons_limit;
  extern server_rec *ap_server_conf;
  extern char ap_coredump_dir[MAX_STRING_LEN];
  
  #endif /* APACHE_MPM_WORKER_H */
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/mpm_default.h
  
  Index: mpm_default.h
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * Portions of this software are based upon public domain software
   * originally written at the National Center for Supercomputing Applications,
   * University of Illinois, Urbana-Champaign.
   */
  
  #ifndef APACHE_MPM_DEFAULT_H
  #define APACHE_MPM_DEFAULT_H
  
  #define AP_ID_FROM_CHILD_THREAD(c, t)    ((c * HARD_THREAD_LIMIT) + t)
  #define AP_CHILD_THREAD_FROM_ID(i)    (i / HARD_THREAD_LIMIT), (i % HARD_THREAD_LIMIT)
  
  /* Number of servers to spawn off by default --- also, if fewer than
   * this free when the caretaker checks, it will spawn more.
   */
  #ifndef DEFAULT_START_DAEMON
  #define DEFAULT_START_DAEMON 3
  #endif
  
  /* Maximum number of *free* server processes --- more than this, and
   * they will die off.
   */
  
  #ifndef DEFAULT_MAX_FREE_DAEMON
  #define DEFAULT_MAX_FREE_DAEMON 10
  #endif
  
  /* Minimum --- fewer than this, and more will be created */
  
  #ifndef DEFAULT_MIN_FREE_DAEMON
  #define DEFAULT_MIN_FREE_DAEMON 3
  #endif
  
  /* Limit on the total --- clients will be locked out if more servers than
   * this are needed.  It is intended solely to keep the server from crashing
   * when things get out of hand.
   *
   * We keep a hard maximum number of servers, for two reasons --- first off,
   * in case something goes seriously wrong, we want to stop the fork bomb
   * short of actually crashing the machine we're running on by filling some
   * kernel table.  Secondly, it keeps the size of the scoreboard file small
   * enough that we can read the whole thing without worrying too much about
   * the overhead.
   */
  #ifdef NO_THREADS
  #define HARD_SERVER_LIMIT 256
  #endif
  #ifndef HARD_SERVER_LIMIT
  #define HARD_SERVER_LIMIT 8 
  #endif
  
  /* Limit on the threads per process.  Clients will be locked out if more than
   * this  * HARD_SERVER_LIMIT are needed.
   *
   * We keep this for one reason it keeps the size of the scoreboard file small
   * enough that we can read the whole thing without worrying too much about
   * the overhead.
   */
  #ifdef NO_THREADS
  #define HARD_THREAD_LIMIT 1
  #endif
  #ifndef HARD_THREAD_LIMIT
  #define HARD_THREAD_LIMIT 64 
  #endif
  
  #ifdef NO_THREADS
  #define DEFAULT_THREADS_PER_CHILD 1
  #endif
  #ifndef DEFAULT_THREADS_PER_CHILD
  #define DEFAULT_THREADS_PER_CHILD 25
  #endif
  
  /* File used for accept locking, when we use a file */
  #ifndef DEFAULT_LOCKFILE
  #define DEFAULT_LOCKFILE "logs/accept.lock"
  #endif
  
  /* Scoreboard file, if there is one */
  #ifndef DEFAULT_SCOREBOARD
  #define DEFAULT_SCOREBOARD "logs/apache_runtime_status"
  #endif
  
  /* Where the main/parent process's pid is logged */
  #ifndef DEFAULT_PIDLOG
  #define DEFAULT_PIDLOG "logs/httpd.pid"
  #endif
  
  /*
   * Interval, in microseconds, between scoreboard maintenance.
   */
  #ifndef SCOREBOARD_MAINTENANCE_INTERVAL
  #define SCOREBOARD_MAINTENANCE_INTERVAL 1000000
  #endif
  
  /* Number of requests to try to handle in a single process.  If <= 0,
   * the children don't die off.
   */
  #ifndef DEFAULT_MAX_REQUESTS_PER_CHILD
  #define DEFAULT_MAX_REQUESTS_PER_CHILD 10000
  #endif
  
  #endif /* AP_MPM_DEFAULT_H */
  
  
  
  1.1                  httpd-2.0/server/mpm/worker/worker.c
  
  Index: worker.c
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2001 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" must
   *    not be used to endorse or promote products derived from this
   *    software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    nor may "Apache" appear in their name, without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * Portions of this software are based upon public domain software
   * originally written at the National Center for Supercomputing Applications,
   * University of Illinois, Urbana-Champaign.
   */
  
  #include "apr.h"
  #include "apr_portable.h"
  #include "apr_strings.h"
  #include "apr_file_io.h"
  #include "apr_thread_proc.h"
  #include "apr_signal.h"
  #define APR_WANT_STRFUNC
  #include "apr_want.h"
  
  #if APR_HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  #if APR_HAVE_SYS_SOCKET_H
  #include <sys/socket.h>
  #endif
  #if APR_HAVE_SYS_WAIT_H
  #include <sys/wait.h> 
  #endif
  #ifdef HAVE_SYS_PROCESSOR_H
  #include <sys/processor.h> /* for bindprocessor() */
  #endif
  
  #if !APR_HAS_THREADS
  #error The Worker MPM requires APR threads, but they are unavailable.
  #endif
  
  #define CORE_PRIVATE 
   
  #include "ap_config.h"
  #include "httpd.h" 
  #include "http_main.h" 
  #include "http_log.h" 
  #include "http_config.h"	/* for read_config */ 
  #include "http_core.h"		/* for get_remote_host */ 
  #include "http_connection.h"
  #include "ap_mpm.h"
  #include "unixd.h"
  #include "mpm_common.h"
  #include "ap_listen.h"
  #include "scoreboard.h" 
  #include "fdqueue.h"
  
  #include <signal.h>
  #include <limits.h>             /* for INT_MAX */
  
  /*
   * Actual definitions of config globals
   */
  
  int ap_threads_per_child=0;         /* Worker threads per child */
  static int ap_max_requests_per_child=0;
  static const char *ap_pid_fname=NULL;
  static int ap_daemons_to_start=0;
  static int min_spare_threads=0;
  static int max_spare_threads=0;
  static int ap_daemons_limit=0;
  static int dying = 0;
  static int workers_may_exit = 0;
  static int requests_this_child;
  static int num_listensocks = 0;
  static apr_socket_t **listensocks;
  static FDQueue *worker_queue;
  
  /* The structure used to pass unique initialization info to each thread */
  typedef struct {
      int pid;
      int tid;
      int sd;
      apr_pool_t *tpool; /* "pthread" would be confusing */
  } proc_info;
  
  /* Structure used to pass information to the thread responsible for 
   * creating the rest of the threads.
   */
  typedef struct {
      apr_thread_t **threads;
      int child_num_arg;
      apr_threadattr_t *threadattr;
  } thread_starter;
  
  /*
   * The max child slot ever assigned, preserved across restarts.  Necessary
   * to deal with MaxClients changes across SIGWINCH restarts.  We use this
   * value to optimize routines that have to scan the entire scoreboard.
   */
  int ap_max_daemons_limit = -1;
  
  char ap_coredump_dir[MAX_STRING_LEN];
  
  static apr_file_t *pipe_of_death_in = NULL;
  static apr_file_t *pipe_of_death_out = NULL;
  static apr_lock_t *pipe_of_death_mutex;   /* insures that a child process only
                                               consumes one character */
  
  /* *Non*-shared http_main globals... */
  
  server_rec *ap_server_conf;
  
  /* one_process --- debugging mode variable; can be set from the command line
   * with the -X flag.  If set, this gets you the child_main loop running
   * in the process which originally started up (no detach, no make_child),
   * which is a pretty nice debugging environment.  (You'll get a SIGHUP
   * early in standalone_main; just continue through.  This is the server
   * trying to kill off any child processes which it might have lying
   * around --- Apache doesn't keep track of their pids, it just sends
   * SIGHUP to the process group, ignoring it in the root process.
   * Continue through and you'll be fine.).
   */
  
  static int one_process = 0;
  
  #ifdef DEBUG_SIGSTOP
  int raise_sigstop_flags;
  #endif
  
  static apr_pool_t *pconf;		/* Pool for config stuff */
  static apr_pool_t *pchild;		/* Pool for httpd child stuff */
  
  static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main 
                             thread. Use this instead */
  /* Keep track of the number of worker threads currently active */
  static int worker_thread_count;
  static apr_lock_t *worker_thread_count_mutex;
  
  /* Locks for accept serialization */
  static apr_lock_t *accept_mutex;
  static apr_lockmech_e_np accept_lock_mech = APR_LOCK_DEFAULT;
  static const char *lock_fname;
  
  #ifdef NO_SERIALIZED_ACCEPT
  #define SAFE_ACCEPT(stmt) APR_SUCCESS
  #else
  #define SAFE_ACCEPT(stmt) (stmt)
  #endif
  
  AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
  {
      switch(query_code){
          case AP_MPMQ_MAX_DAEMON_USED:
              *result = ap_max_daemons_limit;
              return APR_SUCCESS;
          case AP_MPMQ_IS_THREADED:
              *result = AP_MPMQ_STATIC;
              return APR_SUCCESS;
          case AP_MPMQ_IS_FORKED:
              *result = AP_MPMQ_DYNAMIC;
              return APR_SUCCESS;
          case AP_MPMQ_HARD_LIMIT_DAEMONS:
              *result = HARD_SERVER_LIMIT;
              return APR_SUCCESS;
          case AP_MPMQ_HARD_LIMIT_THREADS:
              *result = HARD_THREAD_LIMIT;
              return APR_SUCCESS;
          case AP_MPMQ_MAX_THREADS:
              *result = ap_threads_per_child;
              return APR_SUCCESS;
          case AP_MPMQ_MIN_SPARE_DEAMONS:
              *result = 0;
              return APR_SUCCESS;
          case AP_MPMQ_MIN_SPARE_THREADS:    
              *result = min_spare_threads;
              return APR_SUCCESS;
          case AP_MPMQ_MAX_SPARE_DAEMONS:
              *result = 0;
              return APR_SUCCESS;
          case AP_MPMQ_MAX_SPARE_THREADS:
              *result = max_spare_threads;
              return APR_SUCCESS;
          case AP_MPMQ_MAX_REQUESTS_DEAMON:
              *result = ap_max_requests_per_child;
              return APR_SUCCESS;
          case AP_MPMQ_MAX_DAEMONS:
              *result = ap_daemons_limit;
              return APR_SUCCESS;
      }
      return APR_ENOTIMPL;
  }
  
  /* a clean exit from a child with proper cleanup */ 
  static void clean_child_exit(int code) __attribute__ ((noreturn));
  static void clean_child_exit(int code)
  {
      if (pchild) {
  	apr_pool_destroy(pchild);
      }
      exit(code);
  }
  
  /* handle all varieties of core dumping signals */
  static void sig_coredump(int sig)
  {
      chdir(ap_coredump_dir);
      apr_signal(sig, SIG_DFL);
      kill(ap_my_pid, sig);
      /* At this point we've got sig blocked, because we're still inside
       * the signal handler.  When we leave the signal handler it will
       * be unblocked, and we'll take the signal... and coredump or whatever
       * is appropriate for this particular Unix.  In addition the parent
       * will see the real signal we received -- whereas if we called
       * abort() here, the parent would only see SIGABRT.
       */
  }
  
  static void just_die(int sig)
  {
      clean_child_exit(0);
  }
  
  /*****************************************************************
   * Connection structures and accounting...
   */
  
  /* volatile just in case */
  static int volatile shutdown_pending;
  static int volatile restart_pending;
  static int volatile is_graceful;
  ap_generation_t volatile ap_my_generation;
  
  /*
   * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
   * functions to initiate shutdown or restart without relying on signals. 
   * Previously this was initiated in sig_term() and restart() signal handlers, 
   * but we want to be able to start a shutdown/restart from other sources --
   * e.g. on Win32, from the service manager. Now the service manager can
   * call ap_start_shutdown() or ap_start_restart() as appropiate.  Note that
   * these functions can also be called by the child processes, since global
   * variables are no longer used to pass on the required action to the parent.
   *
   * These should only be called from the parent process itself, since the
   * parent process will use the shutdown_pending and restart_pending variables
   * to determine whether to shutdown or restart. The child process should
   * call signal_parent() directly to tell the parent to die -- this will
   * cause neither of those variable to be set, which the parent will
   * assume means something serious is wrong (which it will be, for the
   * child to force an exit) and so do an exit anyway.
   */
  
  static void ap_start_shutdown(void)
  {
      if (shutdown_pending == 1) {
  	/* Um, is this _probably_ not an error, if the user has
  	 * tried to do a shutdown twice quickly, so we won't
  	 * worry about reporting it.
  	 */
  	return;
      }
      shutdown_pending = 1;
  }
  
  /* do a graceful restart if graceful == 1 */
  static void ap_start_restart(int graceful)
  {
  
      if (restart_pending == 1) {
  	/* Probably not an error - don't bother reporting it */
  	return;
      }
      restart_pending = 1;
      is_graceful = graceful;
      if (is_graceful) {
          apr_pool_cleanup_kill(pconf, NULL, ap_cleanup_scoreboard);
      }
  }
  
  static void sig_term(int sig)
  {
      ap_start_shutdown();
  }
  
  static void restart(int sig)
  {
      ap_start_restart(sig == SIGWINCH);
  }
  
  static void set_signals(void)
  {
  #ifndef NO_USE_SIGACTION
      struct sigaction sa;
  
      sigemptyset(&sa.sa_mask);
      sa.sa_flags = 0;
  
      if (!one_process) {
  	sa.sa_handler = sig_coredump;
  #if defined(SA_ONESHOT)
  	sa.sa_flags = SA_ONESHOT;
  #elif defined(SA_RESETHAND)
  	sa.sa_flags = SA_RESETHAND;
  #endif
  	if (sigaction(SIGSEGV, &sa, NULL) < 0)
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
  #ifdef SIGBUS
  	if (sigaction(SIGBUS, &sa, NULL) < 0)
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
  #endif
  #ifdef SIGABORT
  	if (sigaction(SIGABORT, &sa, NULL) < 0)
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
  #endif
  #ifdef SIGABRT
  	if (sigaction(SIGABRT, &sa, NULL) < 0)
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
  #endif
  #ifdef SIGILL
  	if (sigaction(SIGILL, &sa, NULL) < 0)
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
  #endif
  	sa.sa_flags = 0;
      }
      sa.sa_handler = sig_term;
      if (sigaction(SIGTERM, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
  #ifdef SIGINT
      if (sigaction(SIGINT, &sa, NULL) < 0)
          ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
  #endif
  #ifdef SIGXCPU
      sa.sa_handler = SIG_DFL;
      if (sigaction(SIGXCPU, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
  #endif
  #ifdef SIGXFSZ
      sa.sa_handler = SIG_DFL;
      if (sigaction(SIGXFSZ, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
  #endif
  #ifdef SIGPIPE
      sa.sa_handler = SIG_IGN;
      if (sigaction(SIGPIPE, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
  #endif
  
      /* we want to ignore HUPs and WINCH while we're busy processing one */
      sigaddset(&sa.sa_mask, SIGHUP);
      sigaddset(&sa.sa_mask, SIGWINCH);
      sa.sa_handler = restart;
      if (sigaction(SIGHUP, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
      if (sigaction(SIGWINCH, &sa, NULL) < 0)
  	ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
  #else
      if (!one_process) {
  	apr_signal(SIGSEGV, sig_coredump);
  #ifdef SIGBUS
  	apr_signal(SIGBUS, sig_coredump);
  #endif /* SIGBUS */
  #ifdef SIGABORT
  	apr_signal(SIGABORT, sig_coredump);
  #endif /* SIGABORT */
  #ifdef SIGABRT
  	apr_signal(SIGABRT, sig_coredump);
  #endif /* SIGABRT */
  #ifdef SIGILL
  	apr_signal(SIGILL, sig_coredump);
  #endif /* SIGILL */
  #ifdef SIGXCPU
  	apr_signal(SIGXCPU, SIG_DFL);
  #endif /* SIGXCPU */
  #ifdef SIGXFSZ
  	apr_signal(SIGXFSZ, SIG_DFL);
  #endif /* SIGXFSZ */
      }
  
      apr_signal(SIGTERM, sig_term);
  #ifdef SIGHUP
      apr_signal(SIGHUP, restart);
  #endif /* SIGHUP */
  #ifdef SIGWINCH
      apr_signal(SIGWINCH, restart);
  #endif /* SIGWINCH */
  #ifdef SIGPIPE
      apr_signal(SIGPIPE, SIG_IGN);
  #endif /* SIGPIPE */
  
  #endif
  }
  
  /*****************************************************************
   * Here follows a long bunch of generic server bookkeeping stuff...
   */
  
  int ap_graceful_stop_signalled(void)
  {
      /* XXX - Does this really work? - Manoj */
      return is_graceful;
  }
  
  /*****************************************************************
   * Child process main loop.
   */
  
  static void process_socket(apr_pool_t *p, apr_socket_t *sock, int my_child_num, int my_thread_num)
  {
      conn_rec *current_conn;
      long conn_id = AP_ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
      int csd;
  
      (void) apr_os_sock_get(&csd, sock);
  
      if (csd >= FD_SETSIZE) {
          ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
                       "new file descriptor %d is too large; you probably need "
                       "to rebuild Apache with a larger FD_SETSIZE "
                       "(currently %d)", 
                       csd, FD_SETSIZE);
          apr_socket_close(sock);
          return;
      }
  
      ap_sock_disable_nagle(sock);
  
      current_conn = ap_new_connection(p, ap_server_conf, sock, conn_id);
      if (current_conn) {
          ap_process_connection(current_conn);
          ap_lingering_close(current_conn);
      }
  }
  
  /* requests_this_child has gone to zero or below.  See if the admin coded
     "MaxRequestsPerChild 0", and keep going in that case.  Doing it this way
     simplifies the hot path in worker_thread */
  
  static void check_infinite_requests(void)
  {
      if (ap_max_requests_per_child) {
          workers_may_exit = 1;              
      }
      else {
          /* wow! if you're executing this code, you may have set a record.
           * either this child process has served over 2 billion requests, or
           * you're running a threaded 2.0 on a 16 bit machine.  
           *
           * I'll buy pizza and beers at Apachecon for the first person to do
           * the former without cheating (dorking with INT_MAX, or running with
           * uncommitted performance patches, for example).    
           *
           * for the latter case, you probably deserve a beer too.   Greg Ames
           */
              
          requests_this_child = INT_MAX;      /* keep going */ 
      }
  }
  
  /* Sets workers_may_exit if we received a character on the pipe_of_death */
  static void check_pipe_of_death(void)
  {
      apr_lock_acquire(pipe_of_death_mutex);
      if (!workers_may_exit) {
          apr_status_t ret;
          char pipe_read_char;
  	apr_size_t n = 1;
  
          ret = apr_recv(listensocks[0], &pipe_read_char, &n);
          if (APR_STATUS_IS_EAGAIN(ret)) {
              /* It lost the lottery. It must continue to suffer
               * through a life of servitude. */
          }
          else {
              /* It won the lottery (or something else is very
               * wrong). Embrace death with open arms. */
              workers_may_exit = 1;
          }
      }
      apr_lock_release(pipe_of_death_mutex);
  }
  
  static void *listener_thread(apr_thread_t *thd, void * dummy)
  {
      proc_info * ti = dummy;
      int process_slot = ti->pid;
      int thread_slot = ti->tid;
      apr_pool_t *tpool = ti->tpool;
      apr_socket_t *csd = NULL;
      apr_pool_t *ptrans;		/* Pool for per-transaction stuff */
      apr_socket_t *sd = NULL;
      int n;
      int curr_pollfd, last_pollfd = 0;
      apr_pollfd_t *pollset;
      apr_status_t rv;
  
      free(ti);
  
      apr_pool_create(&ptrans, tpool);
  
      apr_lock_acquire(worker_thread_count_mutex);
      worker_thread_count++;
      apr_lock_release(worker_thread_count_mutex);
  
      apr_poll_setup(&pollset, num_listensocks+1, tpool);
      for(n=0 ; n <= num_listensocks ; ++n)
  	apr_poll_socket_add(pollset, listensocks[n], APR_POLLIN);
  
      worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
      ap_queue_init(worker_queue, ap_threads_per_child, pchild);
  
      /* TODO: Switch to a system where threads reuse the results from earlier
         poll calls - manoj */
      while (1) {
          if (requests_this_child <= 0) {
              check_infinite_requests();
          }
          if (workers_may_exit) break;
  
          if ((rv = SAFE_ACCEPT(apr_lock_acquire(accept_mutex)))
              != APR_SUCCESS) {
              ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
                           "apr_lock_acquire failed. Attempting to shutdown "
                           "process gracefully.");
              workers_may_exit = 1;
          }
  
          while (!workers_may_exit) {
  	    apr_status_t ret;
  	    apr_int16_t event;
  
              ret = apr_poll(pollset, &n, -1);
              if (ret != APR_SUCCESS) {
                  if (APR_STATUS_IS_EINTR(ret)) {
                      continue;
                  }
  
                  /* apr_poll() will only return errors in catastrophic
                   * circumstances. Let's try exiting gracefully, for now. */
                  ap_log_error(APLOG_MARK, APLOG_ERR, ret, (const server_rec *)
                               ap_server_conf, "apr_poll: (listen)");
                  workers_may_exit = 1;
              }
  
              if (workers_may_exit) break;
  
  	    apr_poll_revents_get(&event, listensocks[0], pollset);
              if (event & APR_POLLIN) {
                  /* A process got a signal on the shutdown pipe. Check if we're
                   * the lucky process to die. */
                  check_pipe_of_death();
                  continue;
              }
  
              if (num_listensocks == 1) {
                  sd = ap_listeners->sd;
                  goto got_fd;
              }
              else {
                  /* find a listener */
                  curr_pollfd = last_pollfd;
                  do {
                      curr_pollfd++;
                      if (curr_pollfd > num_listensocks) {
                          curr_pollfd = 1;
                      }
                      /* XXX: Should we check for POLLERR? */
  		    apr_poll_revents_get(&event, listensocks[curr_pollfd], pollset);
                      if (event & APR_POLLIN) {
                          last_pollfd = curr_pollfd;
  			sd=listensocks[curr_pollfd];
                          goto got_fd;
                      }
                  } while (curr_pollfd != last_pollfd);
              }
          }
      got_fd:
          if (!workers_may_exit) {
              if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
                  csd = NULL;
                  ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, 
                               "apr_accept");
              }
              if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex)))
                  != APR_SUCCESS) {
                  ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
                               "apr_lock_release failed. Attempting to shutdown "
                               "process gracefully.");
                  workers_may_exit = 1;
              }
              if (csd != NULL) {
                  ap_queue_push(worker_queue, csd, ptrans);
                  ap_block_on_queue(worker_queue);
              }
          }
          else {
              if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex)))
                  != APR_SUCCESS) {
                  ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
                               "apr_lock_release failed. Attempting to shutdown "
                               "process gracefully.");
                  workers_may_exit = 1;
              }
              break;
          }
      }
  
      apr_pool_destroy(tpool);
      ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL,
          (request_rec *) NULL);
      dying = 1;
      apr_lock_acquire(worker_thread_count_mutex);
      worker_thread_count--;
      if (worker_thread_count == 0) {
          /* All the threads have exited, now finish the shutdown process
           * by signalling the sigwait thread */
          kill(ap_my_pid, SIGTERM);
      }
      apr_lock_release(worker_thread_count_mutex);
  
      return NULL;
  }
  
  static void *worker_thread(apr_thread_t *thd, void * dummy)
  {
      proc_info * ti = dummy;
      int process_slot = ti->pid;
      int thread_slot = ti->tid;
      apr_pool_t *tpool = ti->tpool;
      apr_socket_t *csd = NULL;
      apr_pool_t *ptrans;		/* Pool for per-transaction stuff */
      apr_socket_t *sd = NULL;
      int n;
      int curr_pollfd, last_pollfd = 0;
      apr_pollfd_t *pollset;
      apr_status_t rv;
  
      free(ti);
  
      while (!workers_may_exit) {
          ap_queue_pop(worker_queue, &csd, &ptrans, 1);
          process_socket(ptrans, csd, process_slot, thread_slot);
          requests_this_child--;
          apr_pool_clear(ptrans);
      }
  
      apr_pool_destroy(tpool);
      ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL,
          (request_rec *) NULL);
      apr_lock_acquire(worker_thread_count_mutex);
      if (!dying) {
          /* this is the first thread to exit */
          if (ap_my_pid == ap_scoreboard_image->parent[process_slot].pid) {
              /* tell the parent that it may use this scoreboard slot */
              ap_scoreboard_image->parent[process_slot].quiescing = 1;
          }   
          dying = 1;
      }
      worker_thread_count--;
      if (worker_thread_count == 0) {
          /* All the threads have exited, now finish the shutdown process
           * by signalling the sigwait thread */
          kill(ap_my_pid, SIGTERM);
      }
      apr_lock_release(worker_thread_count_mutex);
  
      return NULL;
  }
  
  static int check_signal(int signum)
  {
      switch (signum) {
          case SIGTERM:
          case SIGINT:
              return 1;
      }                                                                           
      return 0;
  }
  
  static void *start_threads(apr_thread_t *thd, void * dummy)
  {
      thread_starter *ts = dummy;
      apr_thread_t **threads = ts->threads;
      apr_threadattr_t *thread_attr = ts->threadattr;
      int child_num_arg = ts->child_num_arg;
      int i;
      int my_child_num = child_num_arg;
      proc_info *my_info = NULL;
      apr_status_t rv;
      int threads_created = 0;
      apr_thread_t *listener;
  
      while (1) {
          my_info = (proc_info *)malloc(sizeof(proc_info));
          my_info->pid = my_child_num;
          my_info->tid = i;
          my_info->sd = 0;
          apr_pool_create(&my_info->tpool, pchild);
  	apr_thread_create(&listener, thread_attr, listener_thread, my_info, pchild);
          for (i=0; i < ap_threads_per_child; i++) {
              int status = ap_scoreboard_image->servers[child_num_arg][i].status;
  
              if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
                  continue;
              }
  
     	    my_info = (proc_info *)malloc(sizeof(proc_info));
              if (my_info == NULL) {
                  ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
  		             "malloc: out of memory");
                  clean_child_exit(APEXIT_CHILDFATAL);
              }
  	    my_info->pid = my_child_num;
              my_info->tid = i;
  	    my_info->sd = 0;
  	    apr_pool_create(&my_info->tpool, pchild);
  	
    	    /* We are creating threads right now */
  	    (void) ap_update_child_status(my_child_num, i, SERVER_STARTING, 
  	  			          (request_rec *) NULL);
              /* We let each thread update its own scoreboard entry.  This is
               * done because it lets us deal with tid better.
  	     */
  	    if ((rv = apr_thread_create(&threads[i], thread_attr, worker_thread, my_info, pchild))) {
  	        ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
  			     "apr_thread_create: unable to create worker thread");
                  /* In case system resources are maxxed out, we don't want
                     Apache running away with the CPU trying to fork over and
                     over and over again if we exit. */
                  sleep(10);
  	        clean_child_exit(APEXIT_CHILDFATAL);
  	    }
              threads_created++;
          }
          if (workers_may_exit || threads_created == ap_threads_per_child) {
              break;
          }
          sleep(1); /* wait for previous generation to clean up an entry */
      }
      
      /* What state should this child_main process be listed as in the scoreboard...?
       *  ap_update_child_status(my_child_num, i, SERVER_STARTING, (request_rec *) NULL);
       * 
       *  This state should be listed separately in the scoreboard, in some kind
       *  of process_status, not mixed in with the worker threads' status.   
       *  "life_status" is almost right, but it's in the worker's structure, and 
       *  the name could be clearer.   gla
       */
      return NULL;
  }
  
  static void child_main(int child_num_arg)
  {
      apr_thread_t **threads;
      int i;
      ap_listen_rec *lr;
      apr_status_t rv;
      thread_starter *ts;
      apr_threadattr_t *thread_attr;
      apr_thread_t *start_thread_id;
  
      ap_my_pid = getpid();
      apr_pool_create(&pchild, pconf);
  
      /*stuff to do before we switch id's, so we have permissions.*/
      reopen_scoreboard(pchild);
  
      rv = SAFE_ACCEPT(apr_lock_child_init(&accept_mutex, lock_fname,
                       pchild));
      if (rv != APR_SUCCESS) {
          ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
                       "Couldn't initialize cross-process lock in child");
          clean_child_exit(APEXIT_CHILDFATAL);
      }
  
      if (unixd_setup_child()) {
  	clean_child_exit(APEXIT_CHILDFATAL);
      }
  
      ap_run_child_init(pchild, ap_server_conf);
  
      /*done with init critical section */
  
      rv = apr_setup_signal_thread();
      if (rv != APR_SUCCESS) {
          ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
                       "Couldn't initialize signal thread");
          clean_child_exit(APEXIT_CHILDFATAL);
      }
  
      if (ap_max_requests_per_child) {
          requests_this_child = ap_max_requests_per_child;
      }
      else {
          /* coding a value of zero means infinity */
          requests_this_child = INT_MAX;
      }
      
      /* Set up the pollfd array */
      listensocks = apr_pcalloc(pchild,
  			    sizeof(*listensocks) * (num_listensocks + 1));
  #if APR_FILES_AS_SOCKETS
      apr_socket_from_file(&listensocks[0], pipe_of_death_in);
  #endif
      for (lr = ap_listeners, i = 1; i <= num_listensocks; lr = lr->next, ++i)
  	listensocks[i]=lr->sd;
  
      /* Setup worker threads */
  
      /* clear the storage; we may not create all our threads immediately, and we want
       * a 0 entry to indicate a thread which was not created
       */
      threads = (apr_thread_t **)calloc(1, sizeof(apr_thread_t *) * ap_threads_per_child);
      if (threads == NULL) {
          ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
                       "malloc: out of memory");
          clean_child_exit(APEXIT_CHILDFATAL);
      }
      worker_thread_count = 0;
      apr_lock_create(&worker_thread_count_mutex, APR_MUTEX, APR_INTRAPROCESS,
                      NULL, pchild);
      apr_lock_create(&pipe_of_death_mutex, APR_MUTEX, APR_INTRAPROCESS, 
                      NULL, pchild);
  
      ts = apr_palloc(pchild, sizeof(*ts));
  
      apr_threadattr_create(&thread_attr, pchild);
      apr_threadattr_detach_set(thread_attr, 0);    /* 0 means PTHREAD_CREATE_JOINABLE */
  
      ts->threads = threads;
      ts->child_num_arg = child_num_arg;
      ts->threadattr = thread_attr;
  
      if ((rv = apr_thread_create(&start_thread_id, thread_attr, start_threads, ts, pchild))) {
          ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
                       "apr_thread_create: unable to create worker thread");
          /* In case system resources are maxxed out, we don't want
             Apache running away with the CPU trying to fork over and
             over and over again if we exit. */
          sleep(10);
          clean_child_exit(APEXIT_CHILDFATAL);
      }
  
      apr_signal_thread(check_signal);
  
      workers_may_exit = 1;   /* helps us terminate a little more quickly when 
                               * the dispatch of the signal thread
                               * beats the Pipe of Death and the browsers
                               */
      
      /* A terminating signal was received. Now join each of the workers to clean them up.
       *   If the worker already exited, then the join frees their resources and returns.
       *   If the worker hasn't exited, then this blocks until they have (then cleans up).
       */
      apr_thread_join(&rv, start_thread_id);
      for (i = 0; i < ap_threads_per_child; i++) {
          if (threads[i]) { /* if we ever created this thread */
              apr_thread_join(&rv, threads[i]);
          }
      }
  
      free(threads);
  
      clean_child_exit(0);
  }
  
  static int make_child(server_rec *s, int slot) 
  {
      int pid;
  
      if (slot + 1 > ap_max_daemons_limit) {
  	ap_max_daemons_limit = slot + 1;
      }
  
      if (one_process) {
  	set_signals();
          ap_scoreboard_image->parent[slot].pid = getpid();
  	child_main(slot);
      }
  
      if ((pid = fork()) == -1) {
          ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
  
          /* fork didn't succeed. Fix the scoreboard or else
           * it will say SERVER_STARTING forever and ever
           */
          (void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL);
  
  	/* In case system resources are maxxed out, we don't want
  	   Apache running away with the CPU trying to fork over and
  	   over and over again. */
  	sleep(10);
  
  	return -1;
      }
  
      if (!pid) {
  #ifdef HAVE_BINDPROCESSOR
          /* By default, AIX binds to a single processor.  This bit unbinds
  	 * children which will then bind to another CPU.
           */
          int status = bindprocessor(BINDPROCESS, (int)getpid(),
  			       PROCESSOR_CLASS_ANY);
  	if (status != OK)
  	    ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno, ap_server_conf,
  			 "processor unbind failed %d", status);
  #endif
          RAISE_SIGSTOP(MAKE_CHILD);
  
          apr_signal(SIGTERM, just_die);
          child_main(slot);
  
          clean_child_exit(0);
      }
      /* else */
      ap_scoreboard_image->parent[slot].quiescing = 0;
      ap_scoreboard_image->parent[slot].pid = pid;
      return 0;
  }
  
  /* If there aren't many connections coming in from the network, the child 
   * processes may need to be awakened from their network i/o waits.
   * The pipe of death is an effective prod.
   */
     
  static void wake_up_and_die(void) 
  {
      int i;
      char char_of_death = '!';
      apr_size_t one = 1;
      apr_status_t rv;
      
      for (i = 0; i < ap_daemons_limit;) {
          if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one)) 
                                   != APR_SUCCESS) {
              if (APR_STATUS_IS_EINTR(rv)) continue;
              ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, 
                           "write pipe_of_death");
          }
          i++;
      }
  }
  
  /* start up a bunch of children */
  static void startup_children(int number_to_start)
  {
      int i;
  
      for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
  	if (ap_scoreboard_image->parent[i].pid != 0) {
  	    continue;
  	}
  	if (make_child(ap_server_conf, i) < 0) {
  	    break;
  	}
  	--number_to_start;
      }
  }
  
  
  /*
   * idle_spawn_rate is the number of children that will be spawned on the
   * next maintenance cycle if there aren't enough idle servers.  It is
   * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
   * without the need to spawn.
   */
  static int idle_spawn_rate = 1;
  #ifndef MAX_SPAWN_RATE
  #define MAX_SPAWN_RATE	(32)
  #endif
  static int hold_off_on_exponential_spawning;
  
  static void perform_idle_server_maintenance(void)
  {
      int i, j;
      int idle_thread_count;
      worker_score *ws;
      process_score *ps;
      int free_length;
      int free_slots[MAX_SPAWN_RATE];
      int last_non_dead;
      int total_non_dead;
      apr_size_t one = 1;
      apr_status_t rv;
  
      /* initialize the free_list */
      free_length = 0;
  
      idle_thread_count = 0;
      last_non_dead = -1;
      total_non_dead = 0;
  
      ap_sync_scoreboard_image();
      for (i = 0; i < ap_daemons_limit; ++i) {
  	/* Initialization to satisfy the compiler. It doesn't know
  	 * that ap_threads_per_child is always > 0 */
  	int status = SERVER_DEAD;
  	int any_dying_threads = 0;
  	int any_dead_threads = 0;
  
  	if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate)
  	    break;
          ps = &ap_scoreboard_image->parent[i];
  	for (j = 0; j < ap_threads_per_child; j++) {
              ws = &ap_scoreboard_image->servers[i][j];
  	    status = ws->status;
  
  	    any_dying_threads = any_dying_threads || (status == SERVER_GRACEFUL);
  	    any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
  
  	    /* We consider a starting server as idle because we started it
  	     * at least a cycle ago, and if it still hasn't finished starting
  	     * then we're just going to swamp things worse by forking more.
  	     * So we hopefully won't need to fork more if we count it.
  	     * This depends on the ordering of SERVER_READY and SERVER_STARTING.
  	     */
  	    if (status <= SERVER_READY && status != SERVER_DEAD &&
                      ps->generation == ap_my_generation && 
                   /* XXX the following shouldn't be necessary if we clean up 
                    *     properly after seg faults, but we're not yet    GLA 
                    */     
                      ps->pid != 0) {
  	        ++idle_thread_count;
  	    }
  	}
          /* XXX any_dead_threads may not be needed any more GLA */
          if (any_dead_threads && free_length < idle_spawn_rate 
                  && (!ps->pid               /* no process in the slot */
                      || ps->quiescing)) {   /* or at least one is going away */
  	    free_slots[free_length] = i;
  	    ++free_length;
  	}
  	if (!any_dying_threads) {
              last_non_dead = i;
              ++total_non_dead;
          }
      }
      ap_max_daemons_limit = last_non_dead + 1;
  
      if (idle_thread_count > max_spare_threads) {
          char char_of_death = '!';
          /* Kill off one child */
          if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
              ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, "write pipe_of_death");
          }
          idle_spawn_rate = 1;
      }
      else if (idle_thread_count < min_spare_threads) {
          /* terminate the free list */
          if (free_length == 0) {
  	    /* only report this condition once */
  	    static int reported = 0;
  	    
  	    if (!reported) {
  	        ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
  			     "server reached MaxClients setting, consider"
  			     " raising the MaxClients setting");
  		reported = 1;
  	    }
  	    idle_spawn_rate = 1;
  	}
  	else {
  	    
  	    if (idle_spawn_rate >= 8) {
  	        ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
  			     "server seems busy, (you may need "
  			     "to increase StartServers, ThreadsPerChild "
                               "or Min/MaxSpareThreads), "
  			     "spawning %d children, there are around %d idle "
                               "threads, and %d total children", free_length,
  			     idle_thread_count, total_non_dead);
  	    }
  	    for (i = 0; i < free_length; ++i) {
  	        make_child(ap_server_conf, free_slots[i]);
  	    }
  	    /* the next time around we want to spawn twice as many if this
  	     * wasn't good enough, but not if we've just done a graceful
  	     */
  	    if (hold_off_on_exponential_spawning) {
  	        --hold_off_on_exponential_spawning;
  	    }
  	    else if (idle_spawn_rate < MAX_SPAWN_RATE) {
  	        idle_spawn_rate *= 2;
  	    }
  	}
      }
      else {
        idle_spawn_rate = 1;
      }
  }
  
  static void server_main_loop(int remaining_children_to_start)
  {
      int child_slot;
      apr_wait_t status;
      apr_proc_t pid;
      int i;
  
      while (!restart_pending && !shutdown_pending) {
          ap_wait_or_timeout(&status, &pid, pconf);
          
          if (pid.pid != -1) {
              ap_process_child_status(&pid, status);
              /* non-fatal death... note that it's gone in the scoreboard. */
              child_slot = find_child_by_pid(&pid);
              if (child_slot >= 0) {
                  for (i = 0; i < ap_threads_per_child; i++)
                      ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL);
                  
                  ap_scoreboard_image->parent[child_slot].pid = 0;
                  ap_scoreboard_image->parent[child_slot].quiescing = 0;
  		if (remaining_children_to_start
  		    && child_slot < ap_daemons_limit) {
  		    /* we're still doing a 1-for-1 replacement of dead
                       * children with new children
                       */
  		    make_child(ap_server_conf, child_slot);
  		    --remaining_children_to_start;
  		}
  #if APR_HAS_OTHER_CHILD
  	    }
  	    else if (apr_proc_other_child_read(&pid, status) == 0) {
  		/* handled */
  #endif
  	    }
  	    else if (is_graceful) {
  		/* Great, we've probably just lost a slot in the
  		 * scoreboard.  Somehow we don't know about this child.
  		 */
  		ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
  		             ap_server_conf,
  		             "long lost child came home! (pid %ld)",
  		             (long)pid.pid);
  	    }
  	    /* Don't perform idle maintenance when a child dies,
               * only do it when there's a timeout.  Remember only a
               * finite number of children can die, and it's pretty
               * pathological for a lot to die suddenly.
               */
  	    continue;
  	}
  	else if (remaining_children_to_start) {
  	    /* we hit a 1 second timeout in which none of the previous
  	     * generation of children needed to be reaped... so assume
  	     * they're all done, and pick up the slack if any is left.
  	     */
  	    startup_children(remaining_children_to_start);
  	    remaining_children_to_start = 0;
  	    /* In any event we really shouldn't do the code below because
  	     * few of the servers we just started are in the IDLE state
  	     * yet, so we'd mistakenly create an extra server.
  	     */
  	    continue;
  	}
  
  	perform_idle_server_maintenance();
      }
  }
  
  int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
  {
      int remaining_children_to_start;
      apr_status_t rv;
  
      pconf = _pconf;
      ap_server_conf = s;
  
      rv = apr_file_pipe_create(&pipe_of_death_in, &pipe_of_death_out, pconf);
      if (rv != APR_SUCCESS) {
          ap_log_error(APLOG_MARK, APLOG_ERR, rv,
                       (const server_rec*) ap_server_conf,
                       "apr_file_pipe_create (pipe_of_death)");
          exit(1);
      }
  
      if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) {
          ap_log_error(APLOG_MARK, APLOG_ERR, rv,
                       (const server_rec*) ap_server_conf,
                       "apr_file_pipe_timeout_set (pipe_of_death)");
          exit(1);
      }
  
      if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
          /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
          ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
              "no listening sockets available, shutting down");
          return 1;
      }
      ap_log_pid(pconf, ap_pid_fname);
  
      /* Initialize cross-process accept lock */
      lock_fname = apr_psprintf(_pconf, "%s.%" APR_OS_PROC_T_FMT,
                               ap_server_root_relative(_pconf, lock_fname),
                               ap_my_pid);
      rv = apr_lock_create_np(&accept_mutex, APR_MUTEX, APR_LOCKALL,
                              accept_lock_mech, lock_fname, _pconf);
      if (rv != APR_SUCCESS) {
          ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
                       "Couldn't create accept lock");
          return 1;
      }
  
      if (!is_graceful) {
          ap_run_pre_mpm(pconf, SB_SHARED);
      }
  
      set_signals();
      /* Don't thrash... */
      if (max_spare_threads < min_spare_threads + ap_threads_per_child)
  	max_spare_threads = min_spare_threads + ap_threads_per_child;
  
      /* If we're doing a graceful_restart then we're going to see a lot
       * of children exiting immediately when we get into the main loop
       * below (because we just sent them SIGWINCH).  This happens pretty
       * rapidly... and for each one that exits we'll start a new one until
       * we reach at least daemons_min_free.  But we may be permitted to
       * start more than that, so we'll just keep track of how many we're
       * supposed to start up without the 1 second penalty between each fork.
       */
      remaining_children_to_start = ap_daemons_to_start;
      if (remaining_children_to_start > ap_daemons_limit) {
  	remaining_children_to_start = ap_daemons_limit;
      }
      if (!is_graceful) {
  	startup_children(remaining_children_to_start);
  	remaining_children_to_start = 0;
      }
      else {
  	/* give the system some time to recover before kicking into
  	    * exponential mode */
  	hold_off_on_exponential_spawning = 10;
      }
  
      ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
  		"%s configured -- resuming normal operations",
  		ap_get_server_version());
      ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
  		"Server built: %s", ap_get_server_built());
      restart_pending = shutdown_pending = 0;
  
      server_main_loop(remaining_children_to_start);
  
      if (shutdown_pending) {
          /* Time to gracefully shut down:
           * Kill child processes, tell them to call child_exit, etc...
           */
          wake_up_and_die();
  
          if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
              ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
          }
          ap_reclaim_child_processes(1);		/* Start with SIGTERM */
      
          /* cleanup pid file on normal shutdown */
          {
              const char *pidfile = NULL;
              pidfile = ap_server_root_relative (pconf, ap_pid_fname);
              if ( pidfile != NULL && unlink(pidfile) == 0)
                  ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
              		 ap_server_conf,
              		 "removed PID file %s (pid=%ld)",
              		 pidfile, (long)getpid());
          }
      
          ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
              "caught SIGTERM, shutting down");
      
  	return 1;
      }
  
      /* we've been told to restart */
      apr_signal(SIGHUP, SIG_IGN);
  
      if (one_process) {
  	/* not worth thinking about */
  	return 1;
      }
  
      /* advance to the next generation */
      /* XXX: we really need to make sure this new generation number isn't in
       * use by any of the children.
       */
      ++ap_my_generation;
      ap_scoreboard_image->global.running_generation = ap_my_generation;
      update_scoreboard_global();
      
      /* wake up the children...time to die.  But we'll have more soon */
      wake_up_and_die();
      
      if (is_graceful) {
  	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
  		    "SIGWINCH received.  Doing graceful restart");
  
  	/* This is mostly for debugging... so that we know what is still
           * gracefully dealing with existing request.
           */
  	
      }
      else {
        /* Kill 'em all.  Since the child acts the same on the parents SIGTERM 
         * and a SIGHUP, we may as well use the same signal, because some user
         * pthreads are stealing signals from us left and right.
         */
  	if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
  	    ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
  	}
          ap_reclaim_child_processes(1);		/* Start with SIGTERM */
  	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
  		    "SIGHUP received.  Attempting to restart");
      }
      return 0;
  }
  
  static void worker_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
  {
      static int restart_num = 0;
      int no_detach = 0;
  
      one_process = !!ap_exists_config_define("ONE_PROCESS");
      no_detach = !!ap_exists_config_define("NO_DETACH");
  
      /* sigh, want this only the second time around */
      if (restart_num++ == 1) {
  	is_graceful = 0;
  
  	if (!one_process && !no_detach) {
  	    apr_proc_detach();
  	}
  	ap_my_pid = getpid();
      }
  
      unixd_pre_config(ptemp);
      ap_listen_pre_config();
      ap_daemons_to_start = DEFAULT_START_DAEMON;
      min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
      max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
      ap_daemons_limit = HARD_SERVER_LIMIT;
      ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
      ap_pid_fname = DEFAULT_PIDLOG;
      ap_scoreboard_fname = DEFAULT_SCOREBOARD;
      lock_fname = DEFAULT_LOCKFILE;
      ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
      ap_extended_status = 0;
  
      apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
  }
  
  static void worker_hooks(apr_pool_t *p)
  {
      one_process = 0;
  
      ap_hook_pre_config(worker_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
  }
  
  
  static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      if (cmd->server->is_virtual) {
  	return "PidFile directive not allowed in <VirtualHost>";
      }
      ap_pid_fname = arg;
      return NULL;
  }
  
  static const char *set_scoreboard(cmd_parms *cmd, void *dummy,
  				  const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      ap_scoreboard_fname = arg;
      return NULL;
  }
  
  static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      lock_fname = arg;
      return NULL;
  }
  
  static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
  					const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      ap_daemons_to_start = atoi(arg);
      return NULL;
  }
  
  static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy,
  					 const char *arg)
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      min_spare_threads = atoi(arg);
      if (min_spare_threads <= 0) {
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      "WARNING: detected MinSpareThreads set to non-positive.");
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      "Resetting to 1 to avoid almost certain Apache failure.");
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      "Please read the documentation.");
         min_spare_threads = 1;
      }
         
      return NULL;
  }
  
  static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
  					 const char *arg)
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      max_spare_threads = atoi(arg);
      return NULL;
  }
  
  static const char *set_server_limit (cmd_parms *cmd, void *dummy,
  				     const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      ap_daemons_limit = atoi(arg);
      if (ap_daemons_limit > HARD_SERVER_LIMIT) {
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      "WARNING: MaxClients of %d exceeds compile time limit "
                      "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      " lowering MaxClients to %d.  To increase, please "
                      "see the", HARD_SERVER_LIMIT);
         ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                      " HARD_SERVER_LIMIT define in %s.",
                      AP_MPM_HARD_LIMITS_FILE);
         ap_daemons_limit = HARD_SERVER_LIMIT;
      } 
      else if (ap_daemons_limit < 1) {
  	ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1");
  	ap_daemons_limit = 1;
      }
      return NULL;
  }
  
  static const char *set_threads_per_child (cmd_parms *cmd, void *dummy,
  					  const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      ap_threads_per_child = atoi(arg);
      if (ap_threads_per_child > HARD_THREAD_LIMIT) {
          ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                       "WARNING: ThreadsPerChild of %d exceeds compile time "
                       "limit of %d threads,", ap_threads_per_child,
                       HARD_THREAD_LIMIT);
          ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                       " lowering ThreadsPerChild to %d. To increase, please"
                       " see the", HARD_THREAD_LIMIT);
          ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                       " HARD_THREAD_LIMIT define in %s.",
                       AP_MPM_HARD_LIMITS_FILE);
          ap_threads_per_child = HARD_THREAD_LIMIT;
      }
      else if (ap_threads_per_child < 1) {
  	ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, 
                       "WARNING: Require ThreadsPerChild > 0, setting to 1");
  	ap_threads_per_child = 1;
      }
      return NULL;
  }
  
  static const char *set_max_requests(cmd_parms *cmd, void *dummy,
  				    const char *arg) 
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      ap_max_requests_per_child = atoi(arg);
  
      return NULL;
  }
  
  static const char *set_coredumpdir (cmd_parms *cmd, void *dummy,
  				    const char *arg) 
  {
      apr_finfo_t finfo;
      const char *fname;
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      fname = ap_server_root_relative(cmd->pool, arg);
      if ((apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS) 
          || (finfo.filetype != APR_DIR)) {
  	return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname, 
  			  " does not exist or is not a directory", NULL);
      }
      apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
      return NULL;
  }
  
  static const char *set_accept_lock_mech(cmd_parms *cmd, void *dummy, const char *arg)
  {
      const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
      if (err != NULL) {
          return err;
      }
  
      if (!strcasecmp(arg, "default")) {
          accept_lock_mech = APR_LOCK_DEFAULT;
      }
  #if APR_HAS_FLOCK_SERIALIZE
      else if (!strcasecmp(arg, "flock")) {
          accept_lock_mech = APR_LOCK_FLOCK;
      }
  #endif
  #if APR_HAS_FCNTL_SERIALIZE
      else if (!strcasecmp(arg, "fcntl")) {
          accept_lock_mech = APR_LOCK_FCNTL;
      }
  #endif
  #if APR_HAS_SYSVSEM_SERIALIZE
      else if (!strcasecmp(arg, "sysvsem")) {
          accept_lock_mech = APR_LOCK_SYSVSEM;
      }
  #endif
  #if APR_HAS_PROC_PTHREAD_SERIALIZE
      else if (!strcasecmp(arg, "proc_pthread")) {
          accept_lock_mech = APR_LOCK_PROC_PTHREAD;
      }
  #endif
      else {
          return apr_pstrcat(cmd->pool, arg, " is an invalid mutex mechanism; valid "
                             "ones for this platform are: default"
  #if APR_HAS_FLOCK_SERIALIZE
                             ", flock"
  #endif
  #if APR_HAS_FCNTL_SERIALIZE
                             ", fcntl"
  #endif
  #if APR_HAS_SYSVSEM_SERIALIZE
                             ", sysvsem"
  #endif
  #if APR_HAS_PROC_PTHREAD_SERIALIZE
                             ", proc_pthread"
  #endif
                             , NULL);
      }
      return NULL;
  }
  
  static const command_rec worker_cmds[] = {
  UNIX_DAEMON_COMMANDS
  LISTEN_COMMANDS
  AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
      "A file for logging the server process ID"),
  AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
      "A file for Apache to maintain runtime process management information"),
  AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
      "The lockfile used when Apache needs to lock the accept() call"),
  AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
    "Number of child processes launched at server startup"),
  AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
    "Minimum number of idle children, to handle request spikes"),
  AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
    "Maximum number of idle children"),
  AP_INIT_TAKE1("MaxClients", set_server_limit, NULL, RSRC_CONF,
    "Maximum number of children alive at the same time"),
  AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
    "Number of threads each child creates"),
  AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
    "Maximum number of requests a particular child serves before dying."),
  AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
    "The location of the directory Apache changes to before dumping core"),
  AP_INIT_TAKE1("AcceptMutex", set_accept_lock_mech, NULL, RSRC_CONF,
                "The system mutex implementation to use for the accept mutex"),
  { NULL }
  };
  
  module AP_MODULE_DECLARE_DATA mpm_worker_module = {
      MPM20_MODULE_STUFF,
      NULL,                       /* hook to run before apache parses args */
      NULL,			/* create per-directory config structure */
      NULL,			/* merge per-directory config structures */
      NULL,			/* create per-server config structure */
      NULL,			/* merge per-server config structures */
      worker_cmds,		/* command apr_table_t */
      worker_hooks		/* register_hooks */
  };
  
  
  
  

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