заблокировать объект блокировки вращения (lock a spin lock object)
Пролог (Prolog)
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.
Имя (Name)
pthread_spin_lock, pthread_spin_trylock — lock a spin lock object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_spin_lock(pthread_spinlock_t *lock);
int pthread_spin_trylock(pthread_spinlock_t *lock);
Описание (Description)
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.
Возвращаемое значение (Return value)
Upon successful completion, these functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
Ошибки (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.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
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.
Обоснование (Rationale)
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.
Будущие направления (Future directions)
None.
Смотри также (See also)
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)
