pthread_mutex_trylock man page on Ultrix

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pthread_mutex_trylock(3thr)			   pthread_mutex_trylock(3thr)

Name
       pthread_mutex_trylock  - Locks a mutex. If the mutex is already locked,
       the calling thread does not wait for the mutex to become available

Syntax
       #include <pthread.h>

       int pthread_mutex_trylock (mutex)
       pthread_mutex_t *mutex;

Arguments
       mutex   Mutex locked.

Description
       This routine locks a mutex. If the specified mutex  is  locked  when  a
       thread  calls  this  routine,  the calling thread does not wait for the
       mutex to become available.

       When a thread calls this routine, an attempt  is	 made  to  immediately
       lock  the mutex. If the mutex is successfully locked, 1 is returned and
       the current thread is then the mutex's current owner.

       If the mutex is locked by another thread when this routine is called, 0
       is  returned  and  the  thread does not wait to acquire the lock.  If a
       fast mutex is owned by the current thread, 0 is returned.  If a	recur‐
       sive  mutex is owned by the current thread, 1 is returned and the mutex
       is  relocked.   (To  unlock   a	 recursive   mutex,   each   call   to
       pthread_mutex_trylock	must	be    matched	 by    a    call    to
       pthread_mutex_unlock.)

Return Values
       If an error condition occurs, this routine returns -1 and sets errno to
       the corresponding error value.  Possible return values are as follows.

       Return	Error	   Description
       1		   Successful  comple‐
			   tion.

       0		   The	  mutex	    is
			   already     locked;
			   therefore,  it  was
			   not acquired.

       -1	[EINVAL]   The value specified
			   by	  mutex	    is
			   invalid.

						   pthread_mutex_trylock(3thr)
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