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   pthread_attr_getschedparam    ( 3 )

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Имя (Name)

pthread_attr_setschedparam, pthread_attr_getschedparam - set/get
       scheduling parameter attributes in thread attributes object

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Синопсис (Synopsis)

#include <pthread.h>

       int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
                                     const struct sched_param *restrict param);
       int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
                                     struct sched_param *restrict param);

       Compile and link with -pthread.

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Описание (Description)

The pthread_attr_setschedparam() function sets the scheduling
       parameter attributes of the thread attributes object referred to
       by attr to the values specified in the buffer pointed to by
       param.  These attributes determine the scheduling parameters of a
       thread created using the thread attributes object attr.

       The pthread_attr_getschedparam() returns the scheduling parameter
       attributes of the thread attributes object attr in the buffer
       pointed to by param.

       Scheduling parameters are maintained in the following structure:

           struct sched_param {
               int sched_priority;     /* Scheduling priority */
           };

       As can be seen, only one scheduling parameter is supported.  For
       details of the permitted ranges for scheduling priorities in each
       scheduling policy, see sched(7).

       In order for the parameter setting made by
       pthread_attr_setschedparam() to have effect when calling
       pthread_create(3), the caller must use
       pthread_attr_setinheritsched(3) to set the inherit-scheduler
       attribute of the attributes object attr to
       PTHREAD_EXPLICIT_SCHED.

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Возвращаемое значение (Return value)

On success, these functions return 0; on error, they return a
       nonzero error number.

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Ошибки (Error)

pthread_attr_setschedparam() can fail with the following error:

       EINVAL The priority specified in param does not make sense for
              the current scheduling policy of attr.

       POSIX.1 also documents an ENOTSUP error for
       pthread_attr_setschedparam().  This value is never returned on
       Linux (but portable and future-proof applications should
       nevertheless handle this error return value).

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Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │pthread_attr_setschedparam(),         │ Thread safety │ MT-Safe │
       │pthread_attr_getschedparam()          │               │         │
       └──────────────────────────────────────┴───────────────┴─────────┘

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Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008.

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Примечание (Note)

See pthread_attr_setschedpolicy(3) for a list of the thread
       scheduling policies supported on Linux.

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Примеры (Examples)

See pthread_setschedparam(3).

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Смотри также (See also)

sched_get_priority_min(2), pthread_attr_init(3),
       pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3),
       pthread_create(3), pthread_setschedparam(3),
       pthread_setschedprio(3), pthreads(7), sched(7)

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