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)
