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. 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
36 #include "pthread_private.h"
38 static void resume_common(struct pthread *);
40 __weak_reference(_pthread_resume_np, pthread_resume_np);
41 __weak_reference(_pthread_resume_all_np, pthread_resume_all_np);
43 /* Resume a thread: */
45 _pthread_resume_np(pthread_t thread)
49 /* Find the thread in the list of active threads: */
50 if ((ret = _find_thread(thread)) == 0) {
52 * Defer signals to protect the scheduling queues
53 * from access by the signal handler:
55 _thread_kern_sig_defer();
57 if ((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0)
58 resume_common(thread);
61 * Undefer and handle pending signals, yielding if
64 _thread_kern_sig_undefer();
70 _pthread_resume_all_np(void)
72 struct pthread *curthread = _get_curthread();
73 struct pthread *thread;
76 * Defer signals to protect the scheduling queues from access
77 * by the signal handler:
79 _thread_kern_sig_defer();
81 TAILQ_FOREACH(thread, &_thread_list, tle) {
82 if ((thread != curthread) &&
83 ((thread->flags & PTHREAD_FLAGS_SUSPENDED) != 0))
84 resume_common(thread);
88 * Undefer and handle pending signals, yielding if necessary:
90 _thread_kern_sig_undefer();
94 resume_common(struct pthread *thread)
96 /* Clear the suspend flag: */
97 thread->flags &= ~PTHREAD_FLAGS_SUSPENDED;
100 * If the thread's state is suspended, that means it is
101 * now runnable but not in any scheduling queue. Set the
102 * state to running and insert it into the run queue.
104 if (thread->state == PS_SUSPENDED) {
105 PTHREAD_SET_STATE(thread, PS_RUNNING);
106 if (thread->priority_mutex_count > 0)
107 PTHREAD_PRIOQ_INSERT_HEAD(thread);
109 PTHREAD_PRIOQ_INSERT_TAIL(thread);