PTHREAD_SPIN_UNLOCK(3C) Standard C Library Functions

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)