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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD_SPIN_LOCK(3P) POSIX Programmer's Manual PTHREAD_SPIN_LOCK(3P)
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.
pthread_spin_lock, pthread_spin_trylock — lock a spin lock object
#include <pthread.h>
int pthread_spin_lock(pthread_spinlock_t *lock);
int pthread_spin_trylock(pthread_spinlock_t *lock);
The pthread_spin_lock() function shall lock the spin lock
referenced by lock. The calling thread shall acquire the lock if
it is not held by another thread. Otherwise, the thread shall spin
(that is, shall not return from the pthread_spin_lock() call)
until the lock becomes available. The results are undefined if the
calling thread holds the lock at the time the call is made. The
pthread_spin_trylock() function shall lock the spin lock
referenced by lock if it is not held by any thread. Otherwise, the
function shall fail.
The results are undefined if any of these functions is called with
an uninitialized spin lock.
Upon successful completion, these functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
The pthread_spin_lock() function may fail if:
EDEADLK
A deadlock condition was detected.
The pthread_spin_trylock() function shall fail if:
EBUSY A thread currently holds the lock.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
Applications using this function may be subject to priority
inversion, as discussed in the Base Definitions volume of
POSIX.1‐2017, Section 3.291, Priority Inversion.
If an implementation detects that the value specified by the lock
argument to pthread_spin_lock() or pthread_spin_trylock() 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_lock() refers to a spin lock object for
which the calling thread already holds the lock, it is recommended
that the function should fail and report an [EDEADLK] error.
None.
pthread_spin_destroy(3p), pthread_spin_unlock(3p)
The Base Definitions volume of POSIX.1‐2017, Section 3.291,
Priority Inversion, Section 4.12, Memory Synchronization,
pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
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 .
IEEE/The Open Group 2017 PTHREAD_SPIN_LOCK(3P)
Pages that refer to this page: pthread.h(0p), pthread_spin_destroy(3p), pthread_spin_unlock(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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