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. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include "pthread_private.h"
35 static void suspend_common(struct pthread *thread);
37 __weak_reference(_pthread_suspend_np, pthread_suspend_np);
38 __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np);
40 /* Suspend a thread: */
42 _pthread_suspend_np(pthread_t thread)
46 /* Suspending the current thread doesn't make sense. */
47 if (thread == _get_curthread())
50 /* Find the thread in the list of active threads: */
51 else if ((ret = _find_thread(thread)) == 0) {
53 * Defer signals to protect the scheduling queues from
54 * access by the signal handler:
56 _thread_kern_sig_defer();
58 suspend_common(thread);
61 * Undefer and handle pending signals, yielding if
64 _thread_kern_sig_undefer();
70 _pthread_suspend_all_np(void)
72 struct pthread *curthread = _get_curthread();
73 struct pthread *thread;
76 * Defer signals to protect the scheduling queues from
77 * access by the signal handler:
79 _thread_kern_sig_defer();
81 TAILQ_FOREACH(thread, &_thread_list, tle) {
82 if (thread != curthread)
83 suspend_common(thread);
87 * Undefer and handle pending signals, yielding if
90 _thread_kern_sig_undefer();
94 suspend_common(struct pthread *thread)
96 thread->flags |= PTHREAD_FLAGS_SUSPENDED;
97 if (thread->flags & PTHREAD_FLAGS_IN_PRIOQ) {
98 PTHREAD_PRIOQ_REMOVE(thread);
99 PTHREAD_SET_STATE(thread, PS_SUSPENDED);