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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 *attrint
" policy );
int pthread_attr_getschedpolicy(const pthread_attr_t *attrint " *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.1-2001 also documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value") for pthread_attr_setschedpolicy().

Attributes

Multithreading (see pthreads(7) )

The pthread_attr_setschedpolicy() and pthread_attr_getschedpolicy() functions are thread-safe.

Conforming to

POSIX.1-2001.

Example

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)

Colophon

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