xref: /relibc/pthreads-emb/sched_yield.c (revision 2a260e02a9e300838526be2f2a6e178daef876a7)

/*
 * sched_yield.c
 *
 * Description:
 * POSIX thread functions that deal with thread scheduling.
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: jschmidlapp@users.sourceforge.net
 *
 *
 *      Based upon Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 *
 *      Contact Email: rpj@callisto.canberra.edu.au
 *
 *      The original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 included with the
 *      source code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 *
 *      This library is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU Lesser General Public
 *      License as published by the Free Software Foundation; either
 *      version 2 of the License, or (at your option) any later version.
 *
 *      This library is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *      Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public
 *      License along with this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

#include <stdio.h>
#include <stdlib.h>

#include "pte_osal.h"

#include "pthread.h"
#include "implement.h"
#include "sched.h"

int
sched_yield (void)
/*
 * ------------------------------------------------------
 * DOCPUBLIC
 *      This function indicates that the calling thread is
 *      willing to give up some time slices to other threads.
 *
 * PARAMETERS
 *      N/A
 *
 *
 * DESCRIPTION
 *      This function indicates that the calling thread is
 *      willing to give up some time slices to other threads.
 *      NOTE: Since this is part of POSIX 1003.1b
 *                (realtime extensions), it is defined as returning
 *                -1 if an error occurs and sets errno to the actual
 *                error.
 *
 * RESULTS
 *              0               successfully created semaphore,
 *              ENOSYS          sched_yield not supported,
 *
 * ------------------------------------------------------
 */
{
  pte_osThreadSleep (0);

  return 0;
}