1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 2003 Sergey Osokin <osa@FreeBSD.org.ru>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Sergey Osokin.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY SERGEY OSOKIN AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: stable/12/lib/libthr/thread/thr_concurrency.c 325966 2017-11-18 14:26:50Z pfg $");
37
38 #include "namespace.h"
39 #include <errno.h>
40 #include <pthread.h>
41 #include "un-namespace.h"
42
43 #include "thr_private.h"
44
45 static int current_concurrency = 0;
46
47 __weak_reference(_pthread_getconcurrency, pthread_getconcurrency);
48 __weak_reference(_pthread_setconcurrency, pthread_setconcurrency);
49
50 int
_pthread_getconcurrency(void)51 _pthread_getconcurrency(void)
52 {
53 return current_concurrency;
54 }
55
56 int
_pthread_setconcurrency(int new_level)57 _pthread_setconcurrency(int new_level)
58 {
59 int ret;
60
61 if (new_level < 0) {
62 ret = EINVAL;
63 } else {
64 current_concurrency = new_level;
65 ret = 0;
66 }
67 return (ret);
68 }
69