пометить состояние, защищенное надежным мьютексом, как согласованное (mark state protected by robust mutex as consistent)
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_mutex_consistent — mark state protected by robust mutex
as consistent
Синопсис (Synopsis)
#include <pthread.h>
int pthread_mutex_consistent(pthread_mutex_t *mutex);
Описание (Description)
If mutex is a robust mutex in an inconsistent state, the
pthread_mutex_consistent() function can be used to mark the state
protected by the mutex referenced by mutex as consistent again.
If an owner of a robust mutex terminates while holding the mutex,
the mutex becomes inconsistent and the next thread that acquires
the mutex lock shall be notified of the state by the return value
[EOWNERDEAD]. In this case, the mutex does not become normally
usable again until the state is marked consistent.
If the thread which acquired the mutex lock with the return value
[EOWNERDEAD] terminates before calling either
pthread_mutex_consistent() or pthread_mutex_unlock(), the next
thread that acquires the mutex lock shall be notified about the
state of the mutex by the return value [EOWNERDEAD].
The behavior is undefined if the value specified by the mutex
argument to pthread_mutex_consistent() does not refer to an
initialized mutex.
Возвращаемое значение (Return value)
Upon successful completion, the pthread_mutex_consistent()
function shall return zero. Otherwise, an error value shall be
returned to indicate the error.
Ошибки (Error)
The pthread_mutex_consistent() function shall fail if:
EINVAL The mutex object referenced by mutex is not robust or does
not protect an inconsistent state.
These functions shall not return an error code of [EINTR].
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
The pthread_mutex_consistent() function is only responsible for
notifying the implementation that the state protected by the
mutex has been recovered and that normal operations with the
mutex can be resumed. It is the responsibility of the application
to recover the state so it can be reused. If the application is
not able to perform the recovery, it can notify the
implementation that the situation is unrecoverable by a call to
pthread_mutex_unlock() without a prior call to
pthread_mutex_consistent(), in which case subsequent threads that
attempt to lock the mutex will fail to acquire the lock and be
returned [ENOTRECOVERABLE].
Обоснование (Rationale)
If an implementation detects that the value specified by the
mutex argument to pthread_mutex_consistent() does not refer to an
initialized mutex, it is recommended that the function should
fail and report an [EINVAL] error.
Будущие направления (Future directions)
None.
Смотри также (See also)
pthread_mutex_lock(3p), pthread_mutexattr_getrobust(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
