Re: pthread_mutex_destroy call in nptl-2.3.4 thread libraries

[Steve Graegert <graegerts@gmail.com>]

On 2/6/06, Senthil Nathan V <pingtosen@gmail.com> wrote:
> Hi All,
>    I am learning multi-threaded programming in Linux. Locking a
> deleted mutex is possible in nptl threads.

Don't know what you mean here.  Locking a destroyed (thus,
uninitialized mutex) returns EINVAL.

>  Now my query is :
>  * Is there any possible way to check for destroyed mutex ?

Are you looking for a function that lists destroyed mutexes?  If so,
there is none.  If not, calling pthread_mutex_destroy() will fail if
the mutex is invalid (probably destroyed).  pthread_mutex_lock()
returns EINVAL if called for a destroyed (and unitialized) mutex. 
Additionally, pthread_mutex_init __may__ return EBUSY if you try to
reinitialize a mutex which has been previously intialized, but not yet
destroyed.  You may want to combine these calls to detect a destroyed
mutex, although I do __not__ recommend it.

	\Steve

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Steve Graegert <graegerts@gmail.com>
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