[linux-audio-dev] pthread_mutex_unlock

[Jens M Andreasen]

Lee! Forget my other post ...

On Wed, 2006-01-25 at 22:27 -0500, Paul Coccoli wrote:

> In "Programming with POSIX Threads" by David R. Butenhof,
> pthread_mutex_unlock is said to do this:
> 
> "Unlock a mutex.  The mutex becomes unowned.  If any threads are
> waiting for the mutex, one is awakened..."
> 

Yes, but what is the completion of that sentence? Could it be:

... and placed in the ready state.

Or perhaps:

... in priority order to aquire the lock. 

> Seems to suggest a reschedule.  Butenhof worked on the POSIX
> standards, so I would consider him an authority.

There seems to be consensus among Solaris/HPUX/DEC/Linux implementations
that the thread is only awake long enough to aquire the lock. And then a
rescheduling *may* take place.

The posix documentation is a bit vague though. 
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