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Date: Sun, 31 Oct 2004 06:19:45 -0500 (EST)
From: Daniel Eischen <deischen@freebsd.org>
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To: Brian Feldman <green@freebsd.org>
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Subject: Re: cvs commit: src/lib/libpthread/thread thr_mutex.c
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On Sun, 31 Oct 2004, Brian Feldman wrote:

> green       2004-10-31 05:03:50 UTC
>
>   FreeBSD src repository
>
>   Modified files:
>     lib/libpthread/thread thr_mutex.c
>   Log:
>   Make pthread_mutex_trylock(3) return EBUSY on failure, as all software
>   packages expect and seems to be most correct according to the slightly-
>   ambiguous standards.
>
>   MFC after:              1 month
>   Corroborated by:        POSIX <http://tinyurl.com/4uvub>
>   Reviewed by:            silence on threads@

I never saw this, and there has been a couple of long threads about
it.  The current behavior was deemed correct especially since default
mutexes are error check mutexes.  The rationale is that it provides a way
for a thread to tell if it owns the mutex if EDEADLK is returned.

Please back out and sorry for not seeing a posting on -threads.

-- 
Dan Eischen