PTHREAD_ATTR_GETSCHEDPOLICY(3P)                     POSIX Programmer's Manual                    PTHREAD_ATTR_GETSCHEDPOLICY(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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 sched-
       policy 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;  other-
       wise, 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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                               PTHREAD_ATTR_GETSCHEDPOLICY(3P)