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From Joe Orton <jor...@redhat.com>
Subject Re: [users@httpd] Apache 2.0: Recommended Mutex types for Solaris 8,9,10
Date Wed, 05 Oct 2005 13:13:44 GMT
On Mon, Oct 03, 2005 at 11:17:38AM +0200, Axel-St├ęphane  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

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