Man page - pthread_attr_getschedpolicy(3)

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Manual

pthread_attr_setschedpolicy

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
EXAMPLES
SEE ALSO

NAME

pthread_attr_setschedpolicy, pthread_attr_getschedpolicy - set/get scheduling policy attribute in thread attributes object

LIBRARY

POSIX threads library ( libpthread , -lpthread )

SYNOPSIS

#include <pthread.h>

int pthread_attr_setschedpolicy(pthread_attr_t * attr , int policy );
int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr ,
int *restrict policy );

DESCRIPTION

The pthread_attr_setschedpolicy () function sets the scheduling policy attribute of the thread attributes object referred to by attr to the value specified in policy . This attribute determines the scheduling policy of a thread created using the thread attributes object attr .

The supported values for policy are SCHED_FIFO , SCHED_RR , and SCHED_OTHER , with the semantics described in sched (7).

The pthread_attr_getschedpolicy () returns the scheduling policy attribute of the thread attributes object attr in the buffer pointed to by policy .

In order for the policy setting made by pthread_attr_setschedpolicy () 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 .

RETURN VALUE

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

ERRORS

pthread_attr_setschedpolicy () can fail with the following error:

EINVAL

Invalid value in policy .

POSIX.1 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for pthread_attr_setschedpolicy ().

ATTRIBUTES

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

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STANDARDS

POSIX.1-2008.

HISTORY

glibc 2.0. POSIX.1-2001.

EXAMPLES

See pthread_setschedparam (3).

SEE ALSO

pthread_attr_init (3), pthread_attr_setinheritsched (3), pthread_attr_setschedparam (3), pthread_create (3), pthread_setschedparam (3), pthread_setschedprio (3), pthreads (7), sched (7)