lib/libthread_xu/thread/thr_concurrency.c

   1 /*
   2  * Copyright (c) 2003 Daniel M. Eischen <deischen@freebsd.org>
   3  * Copyright (c) 2003 Sergey Osokin <osa@freebsd.org.ru>.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Neither the name of the author nor the names of any co-contributors
  12  *    may be used to endorse or promote products derived from this software
  13  *    without specific prior written permission.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/lib/libpthread/thread/thr_concurrency.c,v 1.8 2004/03/14 05:24:27 bde Exp $
  28  * $DragonFly: src/lib/libthread_xu/thread/thr_concurrency.c,v 1.4 2006/04/06 13:03:09 davidxu Exp $
  29  */
  30
  31 #include "namespace.h"
  32 #include <errno.h>
  33 #include <pthread.h>
  34 #include "un-namespace.h"
  35
  36 static int level = 0;
  37
  38 int
  39 _pthread_getconcurrency(void)
  40 {
  41         return (level);
  42 }
  43
  44 int
  45 _pthread_setconcurrency(int new_level)
  46 {
  47         if (new_level < 0)
  48                 return (EINVAL);
  49         level = new_level;
  50         return 0;
  51 }
  52
  53 __strong_reference(_pthread_getconcurrency, pthread_getconcurrency);
  54 __strong_reference(_pthread_setconcurrency, pthread_setconcurrency);