получить и установить атрибут prioceiling объекта атрибутов мьютекса (REALTIME THREADS) (get and set the prioceiling attribute of the mutex attributes object (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_mutexattr_getprioceiling,
pthread_mutexattr_setprioceiling — get and set the prioceiling
attribute of the mutex attributes object (REALTIME THREADS)
Синопсис (Synopsis)
#include <pthread.h>
int pthread_mutexattr_getprioceiling(const pthread_mutexattr_t
*restrict attr, int *restrict prioceiling);
int pthread_mutexattr_setprioceiling(pthread_mutexattr_t *attr,
int prioceiling);
Описание (Description)
The pthread_mutexattr_getprioceiling() and
pthread_mutexattr_setprioceiling() functions, respectively, shall
get and set the priority ceiling attribute of a mutex attributes
object pointed to by attr which was previously created by the
function pthread_mutexattr_init().
The prioceiling attribute contains the priority ceiling of
initialized mutexes. The values of prioceiling are within the
maximum range of priorities defined by SCHED_FIFO.
The prioceiling attribute defines the priority ceiling of
initialized mutexes, which is the minimum priority level at which
the critical section guarded by the mutex is executed. In order
to avoid priority inversion, the priority ceiling of the mutex
shall be set to a priority higher than or equal to the highest
priority of all the threads that may lock that mutex. The values
of prioceiling are within the maximum range of priorities defined
under the SCHED_FIFO scheduling policy.
The behavior is undefined if the value specified by the attr
argument to pthread_mutexattr_getprioceiling() or
pthread_mutexattr_setprioceiling() does not refer to an
initialized mutex attributes object.
Возвращаемое значение (Return value)
Upon successful completion, the
pthread_mutexattr_getprioceiling() and
pthread_mutexattr_setprioceiling() functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
Ошибки (Error)
These functions may fail if:
EINVAL The value specified by prioceiling is invalid.
EPERM The caller does not have the privilege to perform the
operation.
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)
If an implementation detects that the value specified by the attr
argument to pthread_mutexattr_getprioceiling() or
pthread_mutexattr_setprioceiling() does not refer to an
initialized mutex attributes object, it is recommended that the
function should fail and report an [EINVAL] error.
Будущие направления (Future directions)
None.
Смотри также (See also)
pthread_cond_destroy(3p), pthread_create(3p),
pthread_mutex_destroy(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
