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From Jeff Trawick <traw...@gmail.com>
Subject Re: [users@httpd] Interrupted system call: Failed to acquire SSL session cache lock
Date Wed, 16 Jul 2014 11:30:46 GMT
On Wed, Jul 16, 2014 at 7:20 AM, Yann Ylavic <ylavic.dev@gmail.com> wrote:

> On Wed, Jul 16, 2014 at 12:49 PM, Jeff Trawick <trawick@gmail.com> wrote:
> > On Jul 15, 2014 8:46 PM, "Tomlinson, Stuart" <st024y@intl.att.com>
> wrote:
> >>
> >> Are there any expected negative impacts from using "sysvsem" instead of
> >> "sem" (which I understand defaults to "posixsem" - described in the
> >> documentation as "elegant", whereas "sysvsem" is merely "somewhat
> elegant")?
> >
> > Funny developers...
> >
> > There is safety in numbers (i.e., use what other people on your platform
> > use, unless you have a specific problem).  sysvsem is the default on
> Linux.
> > (I assume you are using Linux, but maybe that is not the case.)
> >
> > Using sysvsem on Solaris with the prefork MPM, you would likely have to
> > increase the number of semaphore undo structures (at least in the old
> days;
> > I can't find my normal go-to reference for AcceptMutex oddities; Eric?)
>
> SSLMutex/AcceptMutex "pthread" work very well on Linux, and have the
> advantage to be "robust" against children crashing while holding the
> lock (like sysvsem, unlike posixsem AFAICT), without system limits
> (unlike sysvsem).
>
> This is probably true for all unixes that HAVE_PTHREAD_MUTEX_ROBUST
> (ie. pthread_mutexattr_setrobust_np), but I can't verify that.
>
> Regards,
> Yann.
>
>
I won't disagree with you at all Yann, but in the interest of promoting the
idea that you don't actually have to use all the configuration httpd offers:

If the poster had not made a change from the default based on some
developer's silly comment in the documentation, they wouldn't have
encountered a problem.  It is best to leave the mutex type alone unless you
have a specific issue.


-- 
Born in Roswell... married an alien...
http://emptyhammock.com/

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