mutex_unlock man page on Tru64

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mutex_unlock(3scl)					    mutex_unlock(3scl)

NAME
       mutex_unlock - Unlocks the specified mutex.

LIBRARY
       SCL Threads Library (libthread.so)

SYNOPSIS
       #include <synch.h>

       int mutex_unlock(
			 mutex_t *mutexp );

PARAMETERS
       Address of the mutex to be unlocked.

DESCRIPTION
       This routine unlocks the mutex specified by the mutexp argument.

SCL IMPLEMENTATION NOTES
       mutex_unlock(3scl) is implemented by calling pthread_mutex_unlock(3).

       If the calling thread does not hold the mutex (either because the mutex
       is unlocked or is held by another thread), then pthread_mutex_unlock(3)
       may  return  either an EPERM status (which mutex_unlock(3scl) maps to 0
       and writes a message outlining the error-code mapping to the SCL error‐
       log),  or  it  may just return 0. The end result in either case is that
       mutex_unlock(3scl) returns 0, which is  consistent  with	 the  observed
       behavior on Solaris.

RETURN VALUES
       If  an  error  condition	 occurs, this routine returns an integer value
       indicating the type of error.

       Additional error return information may be written  to  the  SCL	 error
       log.  Refer to scl_error_log(4scl) for details.

       Possible return values are as follows: Successful completion. Or:

       Error  EPERM  from  pthread_mutex_unlock(3),  meaning  that the calling
       thread does not own the mutex. A message is written to the SCL errorlog
       which outlines the error-code mapping.

       An  internal  implementation  error occurred. Refer to the SCL errorlog
       for additional information.

       Note: EFAULT is not returned if mutexp is an illegal address. An	 ille‐
       gal address generates a SIGSEGV signal, which by default will abort the
       process and generate a core dump.

ERRORS
       None.

RELATED INFORMATION
       Functions:  mutex_destroy(3scl),	 mutex_init(3scl),   mutex_lock(3scl),
       mutex_trylock(3scl),	 pthread_mutex_unlock(3),     scl_intro(3scl),
       scl_thread_intro(3scl)

       Files: scl_error_log(4scl)

       Manuals: Solaris Compatibility Libraries User's Guide

							    mutex_unlock(3scl)
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