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 *attr, int *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 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(), │ Thread safety │ MT-Safe │
       │pthread_attr_getschedpolicy()  │               │         │
       └───────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

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

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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