pthread_attr_getinheritsched

, pthread_attr_setinheritsched

- get or set inheritsched attribute

Synopsis

cc –mt [ flag... ] file... [ library... ]
#include <pthread.h>

int pthread_attr_getinheritsched(const pthread_attr_t *restrict attr,
     int *restrict inheritsched);

int pthread_attr_setinheritsched(pthread_attr_t *attr, int inheritsched);

Description

The functions pthread_attr_setinheritsched() and pthread_attr_getinheritsched(), respectively, set and get the inheritsched attribute in the attr argument.

When the attribute objects are used by pthread_create(), the inheritsched attribute determines how the other scheduling attributes of the created thread are to be set:

PTHREAD_INHERIT_SCHED

Specifies that the scheduling policy and associated attributes are to be inherited from the creating thread, and the scheduling attributes in this attr argument are to be ignored.

PTHREAD_EXPLICIT_SCHED

Specifies that the scheduling policy and associated attributes are to be set to the corresponding values from this attribute object.

The symbols PTHREAD_INHERIT_SCHED and PTHREAD_EXPLICIT_SCHED are defined in the header <pthread.h>.

Return Values

If successful, the pthread_attr_setinheritsched() and pthread_attr_getinheritsched() functions return 0. Otherwise, an error number is returned to indicate the error.

Errors

The pthread_attr_setinheritsched() or pthread_attr_getinheritsched() functions may fail if:

EINVAL

attr or inheritsched is invalid.

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.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

pthread_attr_getschedparam(3C), pthread_attr_init(3C), pthread_attr_setscope(3C), pthread_attr_setschedpolicy(3C), pthread_create(3C), pthread_setschedparam(3C), attributes(5), standards(5)