pthread_attr_setschedpolicy

       the schedpolicy attribute (REALTIME THREADS)

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
              int *restrict policy);
       int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);


DESCRIPTION
       The  pthread_attr_getschedpolicy()  and   pthread_attr_setschedpolicy()
       functions, respectively, shall get and set the schedpolicy attribute in
       the attr argument.

       The supported values of policy shall include SCHED_FIFO, SCHED_RR,  and
       SCHED_OTHER,  which  are defined in the <sched.h> header.  When threads
       executing  with  the  scheduling  policy  SCHED_FIFO,  SCHED_RR,     or
       SCHED_SPORADIC  are waiting on a mutex, they shall acquire the mutex in
       priority order when the mutex is unlocked.

RETURN VALUE
       If     successful,      the      pthread_attr_getschedpolicy()      and
       pthread_attr_setschedpolicy()  functions  shall return zero; otherwise,
       an error number shall be returned to indicate the error.

ERRORS
       The pthread_attr_setschedpolicy() function may fail if:

       EINVAL The value of policy is not valid.

       ENOTSUP
              An attempt was made to  set  the  attribute  to  an  unsupported
              value.


       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       After  these attributes have been set, a thread can be created with the
       specified attributes using pthread_create(). Using these routines  does
       not affect the current running thread.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003       PTHREAD_ATTR_GETSCHEDPOLICY(P)