pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock - lock and unlock a spin lock
#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);
Compile and link with
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
The pthread_spin_lock() function locks the spin lock
referred to by
lock. 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.
The pthread_spin_trylock() function is like
pthread_spin_lock(), except that if the spin lock
referred to by
lock is currently locked, then, instead of
spinning, the call returns immediately with the error
The pthread_spin_unlock() function unlocks the spin
lock referred to
lock. If any threads are spinning on the lock,
one of those threads will then acquire the lock.
Calling pthread_spin_unlock() on a lock that is not held by the caller results in undefined behavior.
On success, these functions return zero. On failure, they return an error number.
These functions first appeared in glibc in version 2.2.
Applying any of the functions described on this page to an uninitialized spin lock results in undefined behavior.
Carefully read NOTES in pthread_spin_init(3).
This page is part of release 5.10 of the Linux
project. A description of the project, information about reporting bugs,
and the latest version of this page, can be found at