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Message-ID: <462E0727.9010402@kippdata.de>
Date: Tue, 24 Apr 2007 15:33:27 +0200
From: Rainer Jung <rainer.jung@kippdata.de>
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To: Tomcat Developers List <dev@tomcat.apache.org>
Subject: Re: More on i5/OS and some modifications needed
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Great. I think I now understand the problem.

Could you try this one relativ to your last change:

Index: mod_jk.c
===================================================================
--- mod_jk.c    (revision 531926)
+++ mod_jk.c    (working copy)
@@ -2539,11 +2539,7 @@

 static apr_status_t jklog_cleanup(void *d)
 {
-    /* set the main_log to NULL */
-#ifdef AS400
-       main_log = null;
-#endif
-
+    /* set the log to NULL */
     d = NULL;
     return APR_SUCCESS;
 }
@@ -2616,9 +2612,10 @@
         jkl->logger_private = flp;
         flp->jklogfp = conf->jklogfp;
         conf->log = jkl;
-        if (main_log == NULL)
+        if (main_log == NULL) {
             main_log = conf->log;
-        apr_pool_cleanup_register(p, conf->log, jklog_cleanup,
jklog_cleanup);
+            apr_pool_cleanup_register(p, main_log, jklog_cleanup,
jklog_cleanup);
+        }
         return 0;
     }

The point is: when I added full virtual server support for all configs I
changed the cleanup function to NULL the virtual server logger. It
NULLed main_log before. But the only reason it should NULL a logger was
the check for NULL in

        if (main_log == NULL)
            main_log = conf->log;

So if main_log is set once, it never gets reset. This is bad, if the
pool from which it got acquired is dead. So we actually need to register
the log cleanup only for main_log, because otherwise main_log will
always reference an outdated logger. conf->log will be overwritten
during each init, no need to reset those.

At least that's my theory for it. Could you test this patch?

Regards,

Rainer


Henri Gomez schrieb:
> I made it works by adding main_log = NULL in jklog_cleanup
> 
> static apr_status_t jklog_cleanup(void *d)
> {
>    /* set the main_log to NULL */
>    d = NULL;
>    main_log = NULL;
>    return APR_SUCCESS;
> }
> 
> Don't forget that jk is initialized twice and on i5/OS in the same
> thread, so may be the static var should be reset.
> 
> What do you think of the patch ?
> 
> 
> 2007/4/24, Rainer Jung <rainer.jung@kippdata.de>:
>> main_log is a static in mod_jk.c, which is initialized as NULL.
>>
>> It gets set inside open_jklog() which gets called once for every virtual
>> server by jk_post_config() during server initialization.
>>
>> The first virtual server inherits its logger conf->log from its
>> configuration to main_log. It also registers a cleanup handler which
>> will NULL its conf->log, but that should not change main_log.
>>
>> main_log should never get reset.
>>
>> To find the problem, it would be best to first reduce the apache config
>> to not use any virtual servers.
>>
>> You can log the value of main_log for debug purposes anywhere in
>> mod_jk.c, because its a global static.
>>
>> Regards,
>>
>> Rainer
>>
>> Henri Gomez schrieb:
>> > I'm looking for the exception in jk_log. It happen in ws_write right
>> > now and I wonder what's the life cycle of main_log.
>> >
>> > On i5/OS, the init / post are done on the same thread (not the same on
>> > Unixes).
>> >
>> > How is reset the main_log ?
>> >
>>
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