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Linux 2.6 - man page for pthread_spin_unlock (linux section 3posix)

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

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;  other-
       wise, 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 pro-
       vided 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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003			   PTHREAD_SPIN_UNLOCK(P)


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