Manpages - pthread_attr_setschedpolicy.3

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

  #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);

  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:

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*().

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

POSIX.1-2001, POSIX.1-2008.

See *pthread_setschedparam*(3).

*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)

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