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   pthread_mutex_getprioceiling.3p    ( 3 )

получить и установить потолок приоритета мьютекса (REALTIME THREADS) (get and set the priority ceiling of a mutex (REALTIME THREADS))

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_getprioceiling, pthread_mutex_setprioceiling — get
       and set the priority ceiling of a mutex (REALTIME THREADS)

Синопсис (Synopsis)

#include <pthread.h>

int pthread_mutex_getprioceiling(const pthread_mutex_t *restrict mutex, int *restrict prioceiling); int pthread_mutex_setprioceiling(pthread_mutex_t *restrict mutex, int prioceiling, int *restrict old_ceiling);


Описание (Description)

The pthread_mutex_getprioceiling() function shall return the
       current priority ceiling of the mutex.

The pthread_mutex_setprioceiling() function shall attempt to lock the mutex as if by a call to pthread_mutex_lock(), except that the process of locking the mutex need not adhere to the priority protect protocol. On acquiring the mutex it shall change the mutex's priority ceiling and then release the mutex as if by a call to pthread_mutex_unlock(). When the change is successful, the previous value of the priority ceiling shall be returned in old_ceiling.

If the pthread_mutex_setprioceiling() function fails, the mutex priority ceiling shall not be changed.


Возвращаемое значение (Return value)

If successful, the pthread_mutex_getprioceiling() and
       pthread_mutex_setprioceiling() functions shall return zero;
       otherwise, an error number shall be returned to indicate the
       error.

Ошибки (Error)

These functions shall fail if:

EINVAL The protocol attribute of mutex is PTHREAD_PRIO_NONE.

EPERM The implementation requires appropriate privileges to perform the operation and the caller does not have appropriate privileges.

The pthread_mutex_setprioceiling() function shall fail if:

EAGAIN The mutex could not be acquired because the maximum number of recursive locks for mutex has been exceeded.

EDEADLK The mutex type is PTHREAD_MUTEX_ERRORCHECK and the current thread already owns the mutex.

EINVAL The mutex was created with the protocol attribute having the value PTHREAD_PRIO_PROTECT and the calling thread's priority is higher than the mutex's current priority ceiling, and the implementation adheres to the priority protect protocol in the process of locking the mutex.

ENOTRECOVERABLE The mutex is a robust mutex and the state protected by the mutex is not recoverable.

EOWNERDEAD The mutex is a robust mutex and the process containing the previous owning thread terminated while holding the mutex lock. The mutex lock shall be acquired by the calling thread and it is up to the new owner to make the state consistent (see pthread_mutex_lock(3p)).

The pthread_mutex_setprioceiling() function may fail if:

EDEADLK A deadlock condition was detected.

EINVAL The priority requested by prioceiling is out of range.

EOWNERDEAD The mutex is a robust mutex and the previous owning thread terminated while holding the mutex lock. The mutex lock shall be acquired by the calling thread and it is up to the new owner to make the state consistent (see pthread_mutex_lock(3p)).

These functions shall not return an error code of [EINTR].

The following sections are informative.


Примеры (Examples)

None.

Использование в приложениях (Application usage)

None.

Обоснование (Rationale)

None.

Будущие направления (Future directions)

None.

Смотри также (See also)

pthread_mutex_destroy(3p), pthread_mutex_lock(3p),
       pthread_mutex_timedlock(3p)

The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)