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   pthread_spin_lock    ( 3 )

заблокировать и разблокировать спин-блокировку (lock and unlock a spin lock)

Имя (Name)

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

Синопсис (Synopsis)

#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 -pthread.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

pthread_spin_lock(), pthread_spin_trylock(): _POSIX_C_SOURCE >= 200112L


Описание (Description)

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.

Calling pthread_spin_lock() on a lock that is already held by the caller or a lock that has not been initialized with pthread_spin_init(3) results in undefined behavior.

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 EBUSY.

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.


Возвращаемое значение (Return value)

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

Ошибки (Error)

pthread_spin_lock() may fail with the following errors:

EDEADLOCK The system detected a deadlock condition.

pthread_spin_trylock() fails with the following errors:

EBUSY The spin lock is currently locked by another thread.


Версии (Versions)

These functions first appeared in glibc in version 2.2.

Стандарты (Conforming to)

POSIX.1-2001.

Примечание (Note)

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).


Смотри также (See also)

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