NAME
pthread_attr_setschedpolicy, pthread_attr_getschedpolicy - set/get scheduling policy attribute in thread attributes object
SYNOPSIS
#include <pthread.h>
int
pthread_attr_setschedpolicy(pthread_attr_t
*attr, int policy);
int pthread_attr_getschedpolicy(const pthread_attr_t
*attr, int *policy);
Compile and link with -pthread.
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).
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
EXAMPLES
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)
COLOPHON
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