pthread_mutex_trylock() should never block
Mike Makonnen
mtm at identd.net
Wed Jan 28 08:50:55 PST 2004
On Sun, Dec 07, 2003 at 01:34:31AM -0500, Daniel Eischen wrote:
>
> The man page may not mention it, and that may be a bug, but I
> think a pthread_mutex_trylock() on a non-recursive mutex is allowed
> to return EDEADLK.
>
> http://www.opengroup.org/onlinepubs/007904975/functions/pthread_mutex_trylock.html
>
> If the mutex type is PTHREAD_MUTEX_ERRORCHECK, then error
> checking shall be provided. If a thread attempts to relock a
> mutex that it has already locked, an error shall be returned.
> If a thread attempts to unlock a mutex that it has not locked
> or a mutex which is unlocked, an error shall be returned.
>
> ...
If you look further down in the spec you will see:
The pthread_mutex_trylock() function shall be equivalent to
pthread_mutex_lock(), except that if the mutex object referenced
by mutex is currently locked (by any thread, including
the current thread), the call shall return immediately...
Cheers.
--
Mike Makonnen | GPG-KEY: http://www.identd.net/~mtm/mtm.asc
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