lib/libc_r/uthread/uthread_concurrency.c

   1 /*
   2  * Copyright (c) 2003 Sergey Osokin <osa@FreeBSD.org.ru>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Sergey Osokin.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY SERGEY OSOKIN AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libc_r/uthread/uthread_concurrency.c,v 1.1.2.1 2003/05/27 18:18:01 jdp Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_concurrency.c,v 1.3 2005/05/30 20:50:53 joerg Exp $
  34  */
  35
  36 #include <errno.h>
  37
  38 static int current_concurrency = 0;
  39
  40 int
  41 _pthread_getconcurrency(void)
  42 {
  43         return current_concurrency;
  44 }
  45
  46 int
  47 _pthread_setconcurrency(int new_level)
  48 {
  49         int ret;
  50
  51         if (new_level < 0) {
  52                 ret = EINVAL;
  53         } else {
  54                 current_concurrency = new_level;
  55                 ret = 0;
  56         }
  57         return(ret);
  58 }
  59
  60 __strong_reference(_pthread_getconcurrency, pthread_getconcurrency);
  61 __strong_reference(_pthread_setconcurrency, pthread_setconcurrency);