Joe, Thanks for replying to my post. Isn't the AcceptMutex only used inside the parent process to serialise the access to the accept(2) system call ? Is your comment about cross-process mutex relevant for SSLMutex rather than AcceptMutex , and would that mean that in your opinion although it might be OK to use pthread for AcceptMutex it should be avoided in the case of SSLMutex ? Would you have any idea of the performance implications of using fcntl or flock over sysvsem or pthread ? Thanks -ascs -----Original Message----- From: Joe Orton [mailto:jorton@xxxxxxxxxx] Sent: Wednesday, October 05, 2005 3:14 PM To: Axel-Stéphane SMORGRAV Cc: users@xxxxxxxxxxxxxxxx Subject: Re: [users@httpd] Apache 2.0: Recommended Mutex types for Solaris 8,9,10 On Mon, Oct 03, 2005 at 11:17:38AM +0200, Axel-Stéphane SMORGRAV wrote: > As far as I can tell, in Apache versions 2.0.49 and prior the default > Mutex type (at least for AcceptMutex) was pthread. It then changed to > fcntl around Apache 2.0.50 leading me to post the following > http://issues.eu.apache.org/bugzilla/show_bug.cgi?id=32325 issue, and > explicitly set both mutexes to pthread which appeared to solve the > problem. > > Several people have since posted similar problems and solved the issue > by explicitly setting the mutex types to something other than > AcceptMutex default and SSLMutex default. > > Does anyone have any idea of the pros and cons of the different mutex > types, provided they are available on any given platform? Is there any > reason to use a different mutex implementation for AcceptMutex than > you would for SSLMutex? What are the performance and operational > issues with each mutex type? A pthread cross-process mutex is not released if the process holding it segfaults; this can lead to the entire server deadlocking particularly if using a threaded MPM. I don't think anybody knows what conditions will lead to the fcntl EDEADLK issue on Solaris, that is really a problem which needs more investigation. (historically, 1.3 always used fnctl on Solaris IIRC, so it is definitely the most "tried and tested") joe --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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