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, 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(P)