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