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From Rodent of Unusual Size <>
Subject [STATUS] (httpd-2.0) Wed Nov 1 23:53:56 2006
Date Thu, 02 Nov 2006 04:53:57 GMT
APACHE 2.0 STATUS:                                              -*-text-*-
Last modified at [$Date: 2006-09-13 15:45:30 -0400 (Wed, 13 Sep 2006) $]

The current version of this file can be found at:


Documentation status is maintained seperately and can be found at:

  * docs/STATUS in this source tree, or

Consult the following STATUS files for information on related projects:


Consult the trunk/ for all new development and documentation efforts:


Release history:

    2.0.60  : in maintenance
    2.0.59  : tagged July 27, 2006
    2.0.58  : released May 1, 2006 as GA. 
    2.0.57  : tagged April 19, 2006, not released.
    2.0.56  : tagged April 16, 2006, not released.
    2.0.55  : released October 16, 2005 as GA.
    2.0.54  : released April 17, 2005 as GA.
    2.0.53  : released February 7, 2005 as GA.
    2.0.52  : released September 28, 2004 as GA.
    2.0.51  : released September 15, 2004 as GA.
    2.0.50  : released June 30, 2004 as GA.
    2.0.49  : released March 19, 2004 as GA.
    2.0.48  : released October 29, 2003 as GA.
    2.0.47  : released July 09, 2003 as GA.
    2.0.46  : released May 28, 2003 as GA.
    2.0.45  : released April 1, 2003 as GA.
    2.0.44  : released January 20, 2003 as GA.
    2.0.43  : released October 3, 2002 as GA.
    2.0.42  : released September 24, 2002 as GA.
    2.0.41  : rolled September 16, 2002.  not released.
    2.0.40  : released August 9, 2002 as GA.
    2.0.39  : released June 17, 2002 as GA.
    2.0.38  : rolled June 16, 2002.  not released.
    2.0.37  : rolled June 11, 2002.  not released.
    2.0.36  : released May 6, 2002 as GA.
    2.0.35  : released April 5, 2002 as GA.
    2.0.34  : tagged March 26, 2002.
    2.0.33  : tagged March 6, 2002.  not released.
    2.0.32  : released Feburary 16, 2002 as beta.
    2.0.31  : rolled Feburary 1, 2002.  not released.
    2.0.30  : tagged January 8, 2002.  not rolled.
    2.0.29  : tagged November 27, 2001.  not rolled.
    2.0.28  : released November 13, 2001 as beta.
    2.0.27  : rolled November 6, 2001
    2.0.26  : tagged October 16, 2001.  not rolled.
    2.0.25  : rolled August 29, 2001
    2.0.24  : rolled August 18, 2001
    2.0.23  : rolled August 9, 2001
    2.0.22  : rolled July 29, 2001
    2.0.21  : rolled July 20, 2001
    2.0.20  : rolled July 8, 2001
    2.0.19  : rolled June 27, 2001
    2.0.18  : rolled May 18, 2001
    2.0.17  : rolled April 17, 2001
    2.0.16  : rolled April 4, 2001
    2.0.15  : rolled March 21, 2001
    2.0.14  : rolled March 7, 2001
    2.0a9   : released December 12, 2000
    2.0a8   : released November 20, 2000
    2.0a7   : released October 8, 2000
    2.0a6   : released August 18, 2000
    2.0a5   : released August 4, 2000
    2.0a4   : released June 7, 2000
    2.0a3   : released April 28, 2000
    2.0a2   : released March 31, 2000
    2.0a1   : released March 10, 2000

Contributors looking for a mission:

    * Just do an egrep on "TODO" or "XXX" in the source.

    * Review the bug database at:

    * Review the "PatchAvailable" bugs in the bug database:

      After testing, you can append a comment saying "Reviewed and tested".

    * Open bugs in the bug database.


    * Forward binary compatibility is expected of Apache 2.0.x releases, such
      that no MMN major number changes will occur.  Such changes can only be
      made in the trunk.

    * All commits to branches/2.0.x must be reflected in SVN trunk,
      as well, if they apply.  Logical progression is commit to trunk,
      get feedback and votes on list or in STATUS, then merge into 
      branches/2.2.x, and finally merge into branches/2.0.x, as applicable.


  [ start all new proposals below, under PATCHES PROPOSED. ]

  [ please place SVN revisions from trunk here, so it is easy to
    identify exactly what the proposed changes are!  Add all new
    proposals to the end of this list. ]

    *) Reverse Proxy fixes: <Location> bug and Cookie support
        Patch is at
        and is in production with Clients.
       +1: niq, wrowe
         wrowe adds; looks good, no way to apply this without a minor bump

    *) Backport 102870; PR 17217; stop linking OpenSSL .so's to support/*
       binaries (especially when compiled --with-static-support (!)) and
       fix to compile against .a openssl archives.
       +1: wrowe, colm

    * htdbm: Fix crash in 64-bit mode on HP-UX caused by unexpected
      placement of crypt() prototype (unistd.h).
        Trunk version of patch:

        2.0.x version of patch:
          Trunk version works
      +1: trawick, wrowe
        wrowe adds; even if ineffective for some oddball machine, this
                    patch is entirely harmless.

    * mod_isapi: Simply backport the host of fixes for compilation on unix,
      PR#'s 15993 29098 30022 16637 30033 28089
      by pushing to trunk/ rev 416293 of modules/arch/win32/mod_isapi.[ch]
      which compiles with the addition of [apr_]brigade_insert_file() as
      cribbed from apr-util 1.x trunk.  Source + Binary posted at
      and delta posted at
      +1: wrowe 

    * mod_ssl: Solve POST incompatible w/ renegotiate HTTPS connection
      (This was already committed to 2.2.x, and the reports persist.)
      +1: wrowe, rpluem

    * mod_cgi and mod_cgid: Don't use apr_status_t error return
      from input filters as HTTP return value from the handler.
      +1: niq


    *) mod_headers: Support {...}s tag for SSL variable lookup.
       +1: jorton, trawick
       nd: two comments:
         (1) is the use of APR_ASCII_* ebcdic-safe? I.e. shouldn't we use the
             native chars here and it will be converted later? (I'm not sure)
       jorton: I have no idea, let an EBCDIC-er complain if it breaks?
       trawick: seems that '\r' and '\n' are the better chars to check
                for; this is not raw data read from the network (or directly
                from SSL) but instead it is either protocol data that has 
                already been converted to the native charset or it is other
                data which was created inside the server in the native charset
         (2) I'd put out (null) only if val is NULL, not if it's empty.
       jorton: ssl_var_lookup() returns "" in place of NULL, that was really
          a deliberate choice... but maybe you're right.

    *) Provide TLS/SSL upgrade functionality in mod_ssl allowing an unsecure
       connection to be upgraded to a secure connection upon request by the
       client.  The full patch is available at
       as well as a test client tlsupgrade.c. This functionality is mainly used
       by IPP clients today.
          modules/ssl/mod_ssl.c: r1.75, r1.97, r1.100
          modules/ssl/mod_ssl.h: r1.123
          modules/ssl/ssl_engine_config.c: r1.71, r1.90
          modules/ssl/ssl_engine_init.c: r1.107, r1.126
          modules/ssl/ssl_engine_io.c: r1.102, r1.124
          modules/ssl/ssl_engine_kernel.c: r1.83, r1.105, r1.108
          modules/ssl/ssl_util.c: r1.36
          modules/ssl/ssl_private.h: r1.2
       +1: bnicholes, wrowe                             
       -0: jerenkrantz (should wait for 2.2)
       -0: pquerna (2.2)
       -0: jorton (msgid <>)

    *) Replace some of the mutex locking in the worker MPM with
       atomic operations for higher concurrency.
         server/mpm/worker/fdqueue.c 1.24, 1.25
       +1: brianp, ianh, jjclar
       trawick: Doesn't this make Apache slower except
                when the right atomic operations are available/
                implemented?  (Due to under-the-covers mutex
                operations when the dummy atomics are used?)
       pquerna: Has anyone tested the performance differences 
                for different platforms? At this point I would 
                favour waiting for 2.2.
       -0: stoddard (at least until the performance implications are clarified)

    *) Allow mod_dav to do weak entity comparison functions.
       modules/dav/main/util.c: r1.45
       [ This one is under review.  Don't merge.  ]

    *) mod_negotiation: parse quality values independent from
       the current locale and level values as integers. PR 17564.
       (essentially: get a rid of atof()) (2.0 + 1.3)
       modules/mappers/mod_negotiation.c: r1.114
       +1: nd
         We need to decide what happens with unparsable qvalues. RFC 2616
         states that q defaults to 1. (see 14.1 - 14.4). So should wrong
         qvalues be returned as 1.0 or 0.0 (as atof() did)?
         1.0: nd
         0.0: jim (a default != an "errored" value)

    *) Keep the same SSLMutex for the lifetime of the parent process
       (instead of having children using different mutexes and failing
       to lock the session cache across restarts.)
       New patch forthcoming - JimJag's changes make the merge ugly.
       +1: wrowe
       +1 (concept): jim (final vote when the patch is available)

    *) Fix the SSLMutex config parser so that all 'mechanisms' can take
       a filename, even if ignored, and they are rooted to the full path
       to the server (except for posixsem locks).  This allows a very
       cross-platform default:logs/ssl_mutex to be used everywhere.  Also
       eliminates the '.pid' suffix so that the name given is the name.
       Allows Win32 and other non-unicies to use named locks.
       New patch forthcoming - JimJag's changes make the merge ugly.
       +1: wrowe
       +1 (concept): jim (final vote when the patch is available)

    *) mod_ssl: Drop SSL_EXPERIMENTAL_ENGINE test in favor of testing for the
       ENGINE_init() function in config.m4, and use HAVE_ENGINE_INIT instead.
       wrowe notes that this feature is a noop until configured with SSLEngine. for a clean 2.0 patch.
       modules/ssl/README 1.40
       modules/ssl/config.m4 1.14
       modules/ssl/mod_ssl.c 1.79
       modules/ssl/mod_ssl.h 1.135
       modules/ssl/ssl_engine_config.c 1.78
       modules/ssl/ssl_engine_init.c 1.113
       modules/ssl/ssl_toolkit_compat.c 1.33
       +0: wrowe {Pending research into how to get AC to use -lsockets et. al.,
                  shows breakage on Solaris which can't -lcrypto -lssl without
                  the extra pkgconfig/openssl.pc Libs: * foo }

    *) mod_ssl: fix a link failure when the openssl-engine libraries are
       present but the engine headers are missing.
         modules/ssl/mod_ssl.c: r1.87
         modules/ssl/mod_ssl.h: r1.139
         modules/ssl/ssl_engine_config.c: r1.82
       PREREQ: Blow away of SSL_EXPERIMENTAL_ENGINE (see above)
       +1: jwoolley, trawick, jim, jerenkrantz

    *) When UseCanonicalName is set to OFF, allow ap_get_server_port to 
       check r->connection->local_addr->port before defaulting to 
       server->port or ap_default_port()
         server/core.c r1.247
       +1: bnicholes, jim, wrowe
       0: nd, jerenkrantz
          nd: can the local_addr->port ever be 0?
	  bnicholes response: I couldn't tell you for sure if local_addr->port
	    could be 0.  But it makes sense that if it were then Apache 
	    wouldn't be listening on any port so it wouldn't matter anyway.
          nd replies: But if it can't be 0 the alternatives thereafter make no
            sense anymore, right?
	  jim proposes: UseCanonicalName Client directive
	    which implements this, keeping UseCanonicalName Off
 	    "as is".

    *) ThreadStackSize for Win32 and threaded MPMs
       trawick will eventually put together a patch for httpd
       +1 concept: trawick, nd, stoddard, wrowe
    *) don't propagate input headers describing a body to a GET subrequest
       with no body
       +1: gregames, wrowe (provided this is applied to ALL subreq types!)
       -1: jerenkrantz (read_length isn't a sufficient check to see if a body
                       is present in the request; presence of T-E and C-L in
                       the headers is the correct flag.)
           gregames: addressed jerenkrantz' objection in rev 160573
           wrowe: this has a negative impact on modules who wish to 'inspect'
             the headers, e.g. an xml transformation affected by the query
             string or request POST args.  The right solution is adopt apreq,
             providing an API for filters to participate in POST bodies.
           gregames: this does not affect POSTs.  the affected function helps
             create a GET subrequest with no body and is unprepared to deal with
             subrequest bodies.  any modules or applications wishing to
             inspect headers will in fact work better because the headers will
             reflect reality.
           wrowe: I've reconsidered - the simple fact is that subrequests
             don't have a good mechanism to 'share' the input body with the
             main request, and it's gotta be up to the main request to handle
             the input body.  If the module wants to use apreq-provided data,
             then it's going to have to ask apreq for the data instead of
             looking at the headers.  For that matter, why are subreq's even
             propogating POST or other non-GET types?  It seems that almost
             any subreq should be handled as a GET in 2.0.


    *) httpd-std.conf and friends;

      a) httpd-std.conf should be tailored by install (from src or
         binbuild) even if user has existing httpd.conf
         +1:   trawick, slive, gregames, ianh, Ken, wrowe, jwoolley, jim, nd,
           wrowe - prefer httpd.default.conf to avoid ambiguity with cvs,
                   note that win32 installer creates just that file
                   (.default.conf rather than .conf.default so that win32
                    can recognize .conf files as text configuration files.)

      c) tailored httpd-std.conf should be installed to
         sysconfdir/examples or manualdir/exampleconf/
         +1:   slive, trawick, Ken, nd (prefer the latter), erikabele

    *) If the parent process dies, should the remaining child processes
       "gracefully" self-terminate. Or maybe we should make it a runtime
       option, or have a concept of 2 parent processes (one being a 
       "hot spare").
       See: Message-ID: <3C58232C.FE91F19F@Golux.Com>

       Self-destruct: Ken, Martin
       Not self-destruct: BrianP, Ian, Cliff, BillS
       Make it runtime configurable: Aaron, Justin, wrowe, rederpj, jim, nd

       /* The below was a concept on *how* to handle the problem */
       Have 2 parents: +1: jim
                       -1: Justin, wrowe, rederpj, nd
                       +0: Martin (while standing by, could it do
                                  something useful?)

    *) Make the worker MPM the default MPM for threaded Unix boxes.
       +1:   Justin, Ian, Cliff, BillS, striker
       +0:   BrianP, Aaron (mutex contention is looking better with the
             latest code, let's continue tuning and testing), rederpj, jim
       -0:   Lars, wrowe (let's make this defacto for the 2.2 release.),
             nd (for 2.0)


    * There is a bug in how we sort some hooks, at least the pre-config
      hook.  The first time we call the hooks, they are in the correct 
      order, but the second time, we don't sort them correctly.  Currently,
      the modules/http/config.m4 file has been renamed to 
      modules/http/config2.m4 to work around this problem, it should moved
      back when this is fixed.

        OtherBill offers that this is a SERIOUS problem.  We do not sort
        correctly by the ordering arguments passed to the register hook
        functions.  This was proven when I reordered the open_logs hook
        to attempt to open the error logs prior to the access logs.  Possibly
        the entire sorting code needs to be refactored.

    * pipes deadlock on all platforms with limited pipe buffers (e.g. both
      Linux and Win32, as opposed to only Win32 on 1.3).  The right solution
      is either GStein's proposal for a "CGI Brigade", or OtherBill's proposal
      for "Poll Buckets" for "Polling Filter Chains".  Or perhaps both :-)

    * All handlers should always send content down even if r->header_only
      is set.  If not, it means that the HEAD requests don't generate the
      same headers as a GET which is wrong.

    * HP/UX 10.20: compile breakage in APR.  Looks like it should be easy
      to fix, probably just some extraneous #include's that are fouling
      things up.
      PR: 9457
      Jeff: See my reply and patch in the PR (and previous commit to
      stop using "pipe" as a field name).  If patch is committed, we
      should be okay.  I'll wait to see if the user tests the patch.
      Update by Jeff 20020722: I got an account on HP 10.20.  It looks
      like some of the APR thread detection is screwed up.  If we find
      pthread.h but we can't compile the pthread test program we still
      think we can use threads.  For that reason, the patch I posted
      to the PR won't work as-is since a failed compile of the test
      program means nothing.

    * exec cmd and suexec arg-passing enhancements
      Status: Patches proposed
      Message-ID: <20020526041748.A29148@prodigy.Redbrick.DCU.IE>
      (see the "proc.patch" and "suexec-shell.patch" links in this message)

    * The 2.0.36 worker MPM graceless shutdown changes work but are
      a bit clunky on some platforms; eg, on Linux, the loop to
      join each worker thread seems to hang, and the parent ends up
      killing off the child with SIGKILL.  But at least it shuts down.

    * --enable-mods-shared="foo1 foo2" is busted on Darwin.  Pier
        posted a patch (Message-ID: <>).

    * We do not properly substitute the prefix-variables in the configuration
      scripts or generated-configs.  (i.e. if sysconfdir is etc,
      httpd-std.conf points to conf.)

    * If any request gets through ap_process_request_internal() and is
      scheduled to be served by the core handler, without a flag that this 
      r->filename was tested by dir/file_walk, we need to 500 at the very 
      end of the ap_process_request_internal() processing so sub_req-esters
      know this request cannot be run.  This provides authors of older 
      modules better compatibility, while still improving the security and 
      robustness of 2.0. 

        Status: still need to decide where this goes, OtherBill comments...
        Message-ID: <065701c14526$495203b0$>
        [Deleted comments regarding the ap_run_handler phase, as irrelevant
            as BillS points out that "common case will be caught in
  	    default_handler already (with the r->finfo.filetype == 0 check)"
            and the issue is detecting this -before- we try to run the req.]

	gregames says: can this happen somehow without a broken module
            being involved?  If not, why waste cycles trying to defend against
            potential broken modules?  It seems futile.
        wrowe counters: no, it shouldn't happen unless the module is broken.
            But the right answer is to fail the request up-front in dir/file
            walk if the path was entirely invalid; and we can't do that either
            UNTIL 2.1 or we break modules that haven't hooked map_to_storage.

    * With AP_MODE_EXHAUSTIVE in the core, it is finally clear to me
      how the Perchild MPM should be re-written.  It hasn't worked
      correctly since filters were added because it wasn't possible to
      get the content that had already been written and the socket at
      the same time.  This mode lets us do that, so the MPM can be

    * htpasswd blindly processes the file you give it, and does no
      sanity checking before totally corrupting whatever file it was
      you thought you had. It should check the input file and bail
      if it finds non-comment lines that do not contain exactly 1
      ':' character.
        Message-ID: <>

    * Can a static httpd be built reliably?
        Message-ID: <>

    * [Ken] Test suite failures:
      o worker is also failing some of the 'cgi' subtests
      (see <URL:http://Source-Zone.Org/Apache/regression/>):
        Justin says: "Worker should be fine and passes httpd-test here.
                      I think it's a perl or a httpd-test problem."

    * Usage of APR_BRIGADE_NORMALIZE in core_input_filter should be
      removed if possible.
        Message-ID: <>
        Jeff wonders if we still care about this.  It is no longer an
        API issue but simply an extra trip through the brigade.

    * The Add...Filter and Set...Filter directives do not allow the
      administrator to order filters, beyond the order of filename (mime)
      extensions.  It isn't clear if Set...Filter(s) should be inserted 
      before or after the Add...Filter(s) which are ordered by sequence of
      filename extensions.  At minimum, some sort of +-[0-10] syntax seems
      like a nice solution.  See ROADMAP.

    * Get perchild to work on platforms other than Linux. This
      will require a portable mechanism to pass data and file/socket
      descriptors between vhost child groups. An API was proposed
      on dev@apr:
        Message-ID: <>

    * Try to get libtool inter-library dependency code working on AIX.
        Message-ID: <>

      Justin says: If we get it working on AIX, we can enable this
                   on all platforms and clean up our build system
      Jeff says:   I thought I tested a patch for you sometime in
                   January that you were going to commit within a few

    * Handling of %2f in URIs.  Currently both 1.3 and 2.0
      completely disallow %2f in the request URI path (see
      ap_unescape_url() in util.c).  It's permitted and passed
      through in the query string, however.  Roy says the
      original reason for disallowing it, from five years ago,
      was to protect CGI scripts that applied PATH_INFO to
      a filesystem location and which might be tricked by
      ..%2f..%2f(...).  We *should* allow path-info of the
      form ''.
      Since we've revamped a lot of our processing of path
      segments, it would be nice to allow this, or at least
      allow it conditionally with a directive.

        OtherBill adds that %2f as the SECOND character of a multibyte
        sequence causes the request to fail!  This happens notably in
        the ja-jis encoding.

      OtherBill is -0.5 for even considering this until 2.2 because
      it removes some protection we provided to third party modules
      that would mysteriously 'evaporate', exposing potential holes
      in security.  Putting this change into 2.1 development now (with
      strong warnings!) will give authors a chance to vet their code.

    * There is increasing demand from module writers for an API
      that will allow them to control the server  la apachectl.
      Reasons include sole-function servers that need to die if
      an external dependency (e.g., a database) fails, et cetera.
      Perhaps something in the (ever more abused) scoreboard?
             On the other hand, we already have a pipe that goes between parent
             and child for graceful shutdown events, along with an API that
             can be used to send a message down that pipe.  In threaded MPMs,
             it is easy enough to make that one pipe be used for graceful
             and graceless events, and it is also easy to open that pipe
             to both parent and child for writing.  Then we just need to
             figure out how to do graceless on non-threaded MPMs.

    * Win32: Rotatelogs sometimes is not terminated when Apache
      goes down hard.  FirstBill was looking at possibly tracking the 
      child's-child processes in the parent process.
        stoddard: Shared scoreboard might offer a good way for the parent 
        to keep track of 'other child' processes and whack them if the child 
        goes down.
        Other thoughts on walking the process chain using the NT kernel
        have also been proposed on APR.

    * Eliminate unnecessary creation of pipes in mod_cgid

    * Combine log_child and piped_log_spawn. Clean up http_log.c.
      Common logging API.

    * There are still a number of places in the code where we are
      losing error status (i.e. throwing away the error returned by a
      system call and replacing it with a generic error code)

    * Mass vhosting version of suEXEC.

    * All DBMs suffer from confusion in support/dbmmanage (perl script) since 
      the dbmmanage employs the first-matched dbm format.  This is not
      necessarily the library that Apache was built with.  Aught to
      rewrite dbmmanage upon installation to bin/ with the proper library 
      for predictable mod_auth_dbm administration.
        Questions; htdbm exists, time to kill dbmmanage, or does it remain
                   useful as a perl dbm management example?  If we keep it,
                   do we address the issue above?
        March discussion summary; we are missing group support.  With that
                   added to trunk, this script will go away.  It will remain
                   in 2.0 based on our versioning approach.

    * Integrate mod_dav.
        Some additional items remaining:
        - case_preserved_filename stuff
            (use the new canonical name stuff?)
        - find a new home for ap_text(_header)
        - is it possible to remove the DAV: namespace stuff from util_xml?

    * ap_core_translate() and its use by mod_mmap_static and mod_file_cache
      are a bit wonky.  The function should probably be exposed as a utility 
      function (such as ap_translate_url2fs() or ap_validate_fs_url() or 
      something).  Another approach would be a new hook phase after
      "translate" which would allow the module to munge what the
      translation has decided to do.
        Status: Greg +1 (volunteers)

    * Explore use of a post-config hook for the code in http_main.c which
      calls ap_fixup_virutal_hosts(), ap_fini_vhost_config(), and
      ap_sort_hooks()  [to reduce the logic in main()]

    * read the config tree just once, and process N times (as necessary)
        OtherBill adds that the 'good' solution of three passes against the
        config tree within one read is the better solution, but breaks many
        modules.  Best left for 2.2?
        -0.5:  OtherBill

    * (possibly) use UUIDs in mod_unique_id and/or mod_usertrack

    * (possibly) port the bug fix for PR 6942 (segv when LoadModule is put
      into a VirtualHost container) to 2.0.

    * shift stuff to mod_core.h

    * callers of ap_run_create_request() should check the return value
      for failure (Doug volunteers)

    * Win32: Get Apache working on Windows 95/98. The following work
        (at least) needs to be done:
        - Document warning that OSR2 is required (for Crypt functions, in
        rand.c, at least.)  This could be resolved with an SSL library, or
        randomization in APR itself.
        - Bring the Win9xConHook.dll from 1.3 into 2.0 (no sense till it
        actually works) and add in a splash of Win9x service code.

    * Fix the worker MPM to use POD to kill child processes instead
      of ap_os_killpg, regardless of how they should die.

    * Scoreboard structures could be changed in the future such that
      proper alignment is not maintained, leading to segfaults on 
      some systems.  Cliff posted a patch to deal with this issue but
      later recanted. See this message to
      Message-ID: <Pine.LNX.4.44.0203011354090.16457-200000@deepthought

    * ap_discard_request should be converted to use the bucket API
      directly rather than waste cycles copying buffers with the old API.

    * SIGSEGV on Linux (glibc 2.1.2) isn't caught properly by a
      sigwaiting thread. We need to work around this, perhaps unless
      there is hope soon for a fixed glibc.


    * General stabilization and testing
    * Fix the shared memory cache

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