2 * Copyright (c) 1997 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 * $Id: uthread_kill.c,v 1.7 1999/06/20 08:28:32 jb Exp $
38 #include "pthread_private.h"
41 pthread_kill(pthread_t pthread, int sig)
45 /* Check for invalid signal numbers: */
46 if (sig < 0 || sig >= NSIG)
51 * Ensure the thread is in the list of active threads, and the
52 * signal is valid (signal 0 specifies error checking only) and
55 else if (((ret = _find_thread(pthread)) == 0) && (sig > 0) &&
56 (_thread_sigact[sig - 1].sa_handler != SIG_IGN)) {
58 * Defer signals to protect the scheduling queues from
59 * access by the signal handler:
61 _thread_kern_sig_defer();
63 switch (pthread->state) {
66 * Only wake up the thread if the signal is unblocked
67 * and there is a handler installed for the signal.
69 if (!sigismember(&pthread->sigmask, sig) &&
70 _thread_sigact[sig - 1].sa_handler != SIG_DFL) {
71 /* Change the state of the thread to run: */
72 PTHREAD_NEW_STATE(pthread,PS_RUNNING);
74 /* Return the signal number: */
77 /* Increment the pending signal count: */
78 sigaddset(&pthread->sigpend,sig);
82 /* Wake up the thread if the signal is blocked. */
83 if (sigismember(pthread->data.sigwait, sig)) {
84 /* Change the state of the thread to run: */
85 PTHREAD_NEW_STATE(pthread,PS_RUNNING);
87 /* Return the signal number: */
90 /* Increment the pending signal count. */
91 sigaddset(&pthread->sigpend,sig);
99 if (!sigismember(&pthread->sigmask, sig) &&
100 (_thread_sigact[sig - 1].sa_handler != SIG_IGN)) {
101 /* Flag the operation as interrupted: */
102 pthread->interrupted = 1;
104 if (pthread->flags & PTHREAD_FLAGS_IN_WORKQ)
105 PTHREAD_WORKQ_REMOVE(pthread);
107 /* Change the state of the thread to run: */
108 PTHREAD_NEW_STATE(pthread,PS_RUNNING);
110 /* Return the signal number: */
111 pthread->signo = sig;
113 /* Increment the pending signal count: */
114 sigaddset(&pthread->sigpend,sig);
119 /* Increment the pending signal count: */
120 sigaddset(&pthread->sigpend,sig);
126 * Check that a custom handler is installed
127 * and if the signal is not blocked:
129 if (_thread_sigact[sig - 1].sa_handler != SIG_DFL &&
130 _thread_sigact[sig - 1].sa_handler != SIG_IGN &&
131 sigismember(&pthread->sigpend, sig) &&
132 !sigismember(&pthread->sigmask, sig)) {
133 pthread_t pthread_saved = _thread_run;
135 /* Current thread inside critical region? */
136 if (_thread_run->sig_defer_count > 0)
137 pthread->sig_defer_count++;
139 _thread_run = pthread;
141 /* Clear the pending signal: */
142 sigdelset(&pthread->sigpend, sig);
145 * Dispatch the signal via the custom signal
148 (*(_thread_sigact[sig - 1].sa_handler))(sig);
150 _thread_run = pthread_saved;
152 if (_thread_run->sig_defer_count > 0)
153 pthread->sig_defer_count--;
157 * Undefer and handle pending signals, yielding if
160 _thread_kern_sig_undefer();
163 /* Return the completion status: */