получить и установить атрибут schedpolicy (REALTIME THREADS) (get and set the schedpolicy attribute (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_attr_getschedpolicy, pthread_attr_setschedpolicy — get
and set the schedpolicy attribute (REALTIME THREADS)
Синопсис (Synopsis)
#include <pthread.h>
int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
int *restrict policy);
int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
Описание (Description)
The pthread_attr_getschedpolicy() and
pthread_attr_setschedpolicy() functions, respectively, shall get
and set the schedpolicy attribute in the attr argument.
The supported values of policy shall include SCHED_FIFO,
SCHED_RR, and SCHED_OTHER, which are defined in the <sched.h>
header. When threads executing with the scheduling policy
SCHED_FIFO, SCHED_RR, or SCHED_SPORADIC are waiting on a mutex,
they shall acquire the mutex in priority order when the mutex is
unlocked.
The behavior is undefined if the value specified by the attr
argument to pthread_attr_getschedpolicy() or
pthread_attr_setschedpolicy() does not refer to an initialized
thread attributes object.
Возвращаемое значение (Return value)
If successful, the pthread_attr_getschedpolicy() and
pthread_attr_setschedpolicy() functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
Ошибки (Error)
The pthread_attr_setschedpolicy() function shall fail if:
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
The pthread_attr_setschedpolicy() function may fail if:
EINVAL The value of policy is not valid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
After these attributes have been set, a thread can be created
with the specified attributes using pthread_create(). Using
these routines does not affect the current running thread.
See Section 2.9.4, Thread Scheduling for further details on
thread scheduling attributes and their default settings.
Обоснование (Rationale)
If an implementation detects that the value specified by the attr
argument to pthread_attr_getschedpolicy() or
pthread_attr_setschedpolicy() does not refer to an initialized
thread 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_attr_destroy(3p), pthread_attr_getscope(3p),
pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p),
pthread_create(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p),
sched.h(0p)
