2 * Copyright (c) 1995 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 resume_common(struct pthread *);
37 __weak_reference(_pthread_resume_np, pthread_resume_np);
38 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np);
40 /* Resume a thread: */
42 _pthread_resume_np(pthread_t thread)
46 /* Find the thread in the list of active threads: */
47 if ((ret = _find_thread(thread)) == 0) {
49 * Defer signals to protect the scheduling queues
50 * from access by the signal handler:
52 _thread_kern_sig_defer();
54 if ((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0)
55 resume_common(thread);
58 * Undefer and handle pending signals, yielding if
61 _thread_kern_sig_undefer();
67 _pthread_resume_all_np(void)
69 struct pthread *curthread = _get_curthread();
70 struct pthread *thread;
73 * Defer signals to protect the scheduling queues from access
74 * by the signal handler:
76 _thread_kern_sig_defer();
78 TAILQ_FOREACH(thread, &_thread_list, tle) {
79 if ((thread != curthread) &&
80 ((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0))
81 resume_common(thread);
85 * Undefer and handle pending signals, yielding if necessary:
87 _thread_kern_sig_undefer();
91 resume_common(struct pthread *thread)
93 /* Clear the suspend flag: */
94 thread->flags &= ~PTHREAD_FLAGS_SUSPENDED;
97 * If the thread's state is suspended, that means it is
98 * now runnable but not in any scheduling queue. Set the
99 * state to running and insert it into the run queue.
101 if (thread->state == PS_SUSPENDED) {
102 PTHREAD_SET_STATE(thread, PS_RUNNING);
103 if (thread->priority_mutex_count > 0)
104 PTHREAD_PRIOQ_INSERT_HEAD(thread);
106 PTHREAD_PRIOQ_INSERT_TAIL(thread);