Name
pthread_attr_setschedpolicy, pthread_attr_getschedpolicy - set/get scheduling policy attribute in thread attributes objectLibrary
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 inpolicy
. 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).Interface | Attribute | Value |
T} | Thread safety | MT-Safe |
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)