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PTHREAD_SPIN_UNLOCK(3P)    POSIX Programmer's Manual   PTHREAD_SPIN_UNLOCK(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       pthread_spin_unlock - unlock a  spin  lock  object  (ADVANCED  REALTIME
       THREADS)
SYNOPSIS
       #include <pthread.h>
       int pthread_spin_unlock(pthread_spinlock_t *lock);

DESCRIPTION
       The  pthread_spin_unlock()  function shall release the spin lock refer-
       enced  by  lock  which  was  locked  via  the  pthread_spin_lock()   or
       pthread_spin_trylock() functions. The results are undefined if the lock
       is not held by the calling thread. If there are threads spinning on the
       lock  when  pthread_spin_unlock() is called, the lock becomes available
       and an unspecified spinning thread shall acquire the lock.
       The results are undefined if this function is called with an uninitial-
       ized thread spin lock.
RETURN VALUE
       Upon  successful  completion,  the pthread_spin_unlock() function shall
       return zero; otherwise, an error number shall be returned  to  indicate
       the error.
ERRORS
       The pthread_spin_unlock() function may fail if:
       EINVAL An invalid argument was specified.
       EPERM  The calling thread does not hold the lock.

       This function shall not return an error code of [EINTR].
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       The pthread_spin_unlock() function is part of the Spin Locks option and
       need not be provided on all implementations.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       pthread_spin_destroy(), pthread_spin_lock(), the Base Definitions  vol-
       ume of IEEE Std 1003.1-2001, <pthread.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003              PTHREAD_SPIN_UNLOCK(3P)