int pthread_spin_unlock(pthread_spinlock_t *lock);
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.
Upon successful completion, the pthread_spin_unlock() function
shall return zero; otherwise, an error number shall be
returned to indicate the error.
The pthread_spin_unlock() function may fail if:
An invalid argument was specified.
The calling thread does not hold the lock.
This function shall not return an error code of [EINTR].
The following sections are informative.
The pthread_spin_unlock() function is part of the Spin Locks
option and need not be provided on all implementations.
pthread_spin_destroy() , pthread_spin_lock() , the Base
Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
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