2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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 John Birrell.
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.
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL 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
32 * $FreeBSD: src/lib/libc_r/uthread/uthread_suspend_np.c,v 1.7.2.6 2002/10/22 14:44:03 fjoe Exp $
36 #include "pthread_private.h"
38 static void suspend_common(struct pthread *thread);
40 __weak_reference(_pthread_suspend_np, pthread_suspend_np);
41 __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
43 /* Suspend a thread: */
45 _pthread_suspend_np(pthread_t thread)
49 /* Suspending the current thread doesn't make sense. */
50 if (thread == _get_curthread())
53 /* Find the thread in the list of active threads: */
54 else if ((ret = _find_thread(thread)) == 0) {
56 * Defer signals to protect the scheduling queues from
57 * access by the signal handler:
59 _thread_kern_sig_defer();
61 suspend_common(thread);
64 * Undefer and handle pending signals, yielding if
67 _thread_kern_sig_undefer();
73 _pthread_suspend_all_np(void)
75 struct pthread *curthread = _get_curthread();
76 struct pthread *thread;
79 * Defer signals to protect the scheduling queues from
80 * access by the signal handler:
82 _thread_kern_sig_defer();
84 TAILQ_FOREACH(thread, &_thread_list, tle) {
85 if (thread != curthread)
86 suspend_common(thread);
90 * Undefer and handle pending signals, yielding if
93 _thread_kern_sig_undefer();
97 suspend_common(struct pthread *thread)
99 thread->flags |= PTHREAD_FLAGS_SUSPENDED;
100 if (thread->flags & PTHREAD_FLAGS_IN_PRIOQ) {
101 PTHREAD_PRIOQ_REMOVE(thread);
102 PTHREAD_SET_STATE(thread, PS_SUSPENDED);