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_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(), 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)

COLOPHON

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