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 (con-
       sult 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  referenced  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 uninitialized 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 volume 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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                       PTHREAD_SPIN_UNLOCK(3P)