PTHREAD_SPIN_UNLOCK(3C) Standard C Library Functions PTHREAD_SPIN_UNLOCK(3C)


NAME


pthread_spin_unlock - unlock a spin lock object

SYNOPSIS


cc -mt [ flag... ] file... [ library... ]
#include <pthread.h>

int pthread_spin_unlock(pthread_spinlock_t *lock);


DESCRIPTION


The pthread_spin_unlock() function releases the spin lock referenced by
lock which was locked with the pthread_spin_lock(3C) or
pthread_spin_trylock(3C) 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 acquires the lock.


The results are undefined if this function is called with an
uninitialized thread spin lock.

RETURN VALUES


Upon successful completion, the pthread_spin_unlock() function returns 0.
Otherwise, an error number shall be returned to indicate the error.

ERRORS


The pthread_spin_unlock() function will fail if:

EINVAL
An invalid argument was specified.


EPERM
The calling thread does not hold the lock.


ATTRIBUTES


See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


pthread_spin_destroy(3C), pthread_spin_lock(3C), attributes(7),
standards(7)


January 30, 2004 PTHREAD_SPIN_UNLOCK(3C)