установить / получить атрибут наследования-планировщика в объекте атрибутов потока (set/get inherit-scheduler attribute in thread attributes object)
Имя (Name)
pthread_attr_setinheritsched, pthread_attr_getinheritsched -
set/get inherit-scheduler attribute in thread attributes object
Синопсис (Synopsis)
#include <pthread.h>
int pthread_attr_setinheritsched(pthread_attr_t *attr,
int inheritsched);
int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
int *restrict inheritsched);
Compile and link with -pthread.
Описание (Description)
The pthread_attr_setinheritsched() function sets the inherit-
scheduler attribute of the thread attributes object referred to
by attr to the value specified in inheritsched. The inherit-
scheduler attribute determines whether a thread created using the
thread attributes object attr will inherit its scheduling
attributes from the calling thread or whether it will take them
from attr.
The following scheduling attributes are affected by the inherit-
scheduler attribute: scheduling policy
(pthread_attr_setschedpolicy(3)), scheduling priority
(pthread_attr_setschedparam(3)), and contention scope
(pthread_attr_setscope(3)).
The following values may be specified in inheritsched:
PTHREAD_INHERIT_SCHED
Threads that are created using attr inherit scheduling
attributes from the creating thread; the scheduling
attributes in attr are ignored.
PTHREAD_EXPLICIT_SCHED
Threads that are created using attr take their scheduling
attributes from the values specified by the attributes
object.
The default setting of the inherit-scheduler attribute in a newly
initialized thread attributes object is PTHREAD_INHERIT_SCHED.
The pthread_attr_getinheritsched() returns the inherit-scheduler
attribute of the thread attributes object attr in the buffer
pointed to by inheritsched.
Возвращаемое значение (Return value)
On success, these functions return 0; on error, they return a
nonzero error number.
Ошибки (Error)
pthread_attr_setinheritsched() can fail with the following error:
EINVAL Invalid value in inheritsched.
POSIX.1 also documents an optional ENOTSUP error ("attempt was
made to set the attribute to an unsupported value") for
pthread_attr_setinheritsched().
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│pthread_attr_setinheritsched(), │ Thread safety │ MT-Safe │
│pthread_attr_getinheritsched() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Ошибки (баги) (Bugs)
As at glibc 2.8, if a thread attributes object is initialized
using pthread_attr_init(3), then the scheduling policy of the
attributes object is set to SCHED_OTHER and the scheduling
priority is set to 0. However, if the inherit-scheduler
attribute is then set to PTHREAD_EXPLICIT_SCHED, then a thread
created using the attribute object wrongly inherits its
scheduling attributes from the creating thread. This bug does
not occur if either the scheduling policy or scheduling priority
attribute is explicitly set in the thread attributes object
before calling pthread_create(3).
Примеры (Examples)
See pthread_setschedparam(3).
Смотри также (See also)
pthread_attr_init(3), pthread_attr_setschedparam(3),
pthread_attr_setschedpolicy(3), pthread_attr_setscope(3),
pthread_create(3), pthread_setschedparam(3),
pthread_setschedprio(3), pthreads(7), sched(7)
