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

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; 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 Technol- ogy -- 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)