NAME

       pthread_attr_getschedpolicy,   pthread_attr_setschedpolicy  -  get  and  set  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.

SEE ALSO

       pthread_attr_destroy()      ,      pthread_attr_getscope()     ,     pthread_attr_getinheritsched()     ,
       pthread_attr_getschedparam() , pthread_create() , the Base Definitions  volume  of  IEEE Std 1003.1-2001,
       <pthread.h>, <sched.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,
       Inc and The Open Group. In the event of any discrepancy between this version and the  original  IEEE  and
       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)