pthread_attr_setschedpolicy, pthread_attr_getschedpolicy − set/get scheduling policy attribute in thread attributes object
*attr, int policy);
int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);
Compile and link with −pthread.
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.
On success, these functions return 0; on error, they return a nonzero error number.
pthread_attr_setschedpolicy() can fail with the following error:
Invalid value in policy.
POSIX.1-2001 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for pthread_attr_setschedpolicy().
The pthread_attr_setschedpolicy() and pthread_attr_getschedpolicy() functions are thread-safe.
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