Movatterモバイル変換

pthread_spin_lock(3) — Linux manual page

pthread_spin_lock(3)     Library Functions Manualpthread_spin_lock(3)

NAME        top

       pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock -       lock and unlock a spin lock

LIBRARY        top

       POSIX threads library (libpthread,-lpthread)

SYNOPSIS        top

#include <pthread.h>int pthread_spin_lock(pthread_spinlock_t *lock);int pthread_spin_trylock(pthread_spinlock_t *lock);int pthread_spin_unlock(pthread_spinlock_t *lock);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):pthread_spin_lock(),pthread_spin_trylock():           _POSIX_C_SOURCE >= 200112L

DESCRIPTION        top

       Thepthread_spin_lock() function locks the spin lock referred to       bylock.  If the spin lock is currently unlocked, the calling       thread acquires the lock immediately.  If the spin lock is       currently locked by another thread, the calling thread spins,       testing the lock until it becomes available, at which point the       calling thread acquires the lock.       Callingpthread_spin_lock() on a lock that is already held by the       caller or a lock that has not been initialized withpthread_spin_init(3) results in undefined behavior.       Thepthread_spin_trylock() function is likepthread_spin_lock(),       except that if the spin lock referred to bylock is currently       locked, then, instead of spinning, the call returns immediately       with the errorEBUSY.       Thepthread_spin_unlock() function unlocks the spin lock referred       tolock.  If any threads are spinning on the lock, one of those       threads will then acquire the lock.       Callingpthread_spin_unlock() on a lock that is not held by the       caller results in undefined behavior.

RETURN VALUE        top

       On success, these functions return zero.  On failure, they return       an error number.

ERRORS        top

pthread_spin_lock() may fail with the following errors:EDEADLOCK              The system detected a deadlock condition.pthread_spin_trylock() fails with the following errors:EBUSYThe spin lock is currently locked by another thread.

STANDARDS        top

       POSIX.1-2008.

HISTORY        top

       glibc 2.2.  POSIX.1-2001.

CAVEATS        top

       Applying any of the functions described on this page to an       uninitialized spin lock results in undefined behavior.       Carefully read NOTES inpthread_spin_init(3).

SEE ALSO        top

pthread_spin_destroy(3),pthread_spin_init(3),pthreads(7)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17pthread_spin_lock(3)

Pages that refer to this page:pthread_spin_init(3), pthreads(7)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.