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)
