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PTHREAD_ATTR_SETSCHEDPOLICY(3)                                          Linux Programmer's Manual                                         PTHREAD_ATTR_SETSCHEDPOLICY(3)

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 *restrict attr,
                                       int *restrict 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_setinher‐
       itsched(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   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │pthread_attr_setschedpolicy(), pthread_attr_getschedpolicy()                                                                          │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

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)

Linux                                                                          2021-03-22                                                 PTHREAD_ATTR_SETSCHEDPOLICY(3)