PTHREAD_SPIN_UNLOCK
Section: POSIX Programmer's Manual (3P)
Updated: 2013
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PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
pthread_spin_unlock
--- unlock a spin lock object
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
This function shall not return an error code of
[EINTR].
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
If an implementation detects that the value specified by the
lock
argument to
pthread_spin_unlock()
does not refer to an initialized spin lock object, it is recommended
that the function should fail and report an
[EINVAL]
error.
If an implementation detects that the value specified by the
lock
argument to
pthread_spin_unlock()
refers to a spin lock object for which the current thread does not
hold the lock, it is recommended that the function should fail
and report an
[EPERM]
error.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_spin_destroy(),
pthread_spin_lock()
The Base Definitions volume of POSIX.1-2008,
Section 4.11,
Memory Synchronization,
<pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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