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
31 #include <sys/types.h>
36 #include "pthread_private.h"
38 __weak_reference(__wait4, wait4);
41 _wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
43 struct pthread *curthread = _get_curthread();
46 _thread_kern_sig_defer();
48 /* Perform a non-blocking wait4 syscall: */
49 while ((ret = __sys_wait4(pid, istat, options | WNOHANG, rusage)) == 0 && (options & WNOHANG) == 0) {
50 /* Reset the interrupted operation flag: */
51 curthread->interrupted = 0;
53 /* Schedule the next thread while this one waits: */
54 _thread_kern_sched_state(PS_WAIT_WAIT, __FILE__, __LINE__);
56 /* Check if this call was interrupted by a signal: */
57 if (curthread->interrupted) {
64 _thread_kern_sig_undefer();
70 __wait4(pid_t pid, int *istat, int options, struct rusage *rusage)
74 _thread_enter_cancellation_point();
75 ret = _wait4(pid, istat, options, rusage);
76 _thread_leave_cancellation_point();