1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000 The Apache Software Foundation. All rights
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
59 /* The purpose of this file is to store the code that MOST mpm's will need
60 * this does not mean a function only goes into this file if every MPM needs
61 * it. It means that if a function is needed by more than one MPM, and
62 * future maintenance would be served by making the code common, then the
63 * function belongs here.
65 * This is going in src/main because it is not platform specific, it is
66 * specific to multi-process servers, but NOT to Unix. Which is why it
67 * does not belong in src/os/unix
70 #include "apr_thread_proc.h"
72 #include "http_config.h"
75 #include "mpm_common.h"
77 #if defined(DEXTER_MPM) || defined(MPMT_BEOS_MPM)
79 #define CHILD_INFO_TABLE ap_child_table
80 #elif defined(MPMT_PTHREAD_MPM) || defined (PREFORK_MPM)
82 #define CHILD_INFO_TABLE ap_scoreboard_image->parent
86 #ifdef CHILD_INFO_TABLE
87 void ap_reclaim_child_processes(int terminate)
90 long int waittime = 1024 * 16; /* in usecs */
97 ap_sync_scoreboard_image();
100 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
101 /* don't want to hold up progress any more than
102 * necessary, but we need to allow children a few moments to exit.
103 * Set delay with an exponential backoff.
105 tv.tv_sec = waittime / 1000000;
106 tv.tv_usec = waittime % 1000000;
107 waittime = waittime * 4;
108 ap_select(0, NULL, NULL, NULL, &tv);
110 /* now see who is done */
112 for (i = 0; i < ap_max_daemons_limit; ++i) {
113 pid_t pid = CHILD_INFO_TABLE[i].pid;
117 if (ap_child_table[i].status == SERVER_DEAD)
118 #elif defined(SCOREBOARD)
119 if (pid == ap_my_pid || pid == 0)
124 waitret = ap_wait_proc(&proc, APR_NOWAIT);
125 if (waitret != APR_CHILD_NOTDONE) {
127 ap_child_table[i].status = SERVER_DEAD;
128 #elif defined(SCOREBOARD)
129 ap_scoreboard_image->parent[i].pid = 0;
143 /* ok, now it's being annoying */
144 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
146 "child process %ld still did not exit, sending a SIGTERM",
152 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
154 "child process %ld still did not exit, sending a SIGKILL",
159 /* gave it our best shot, but alas... If this really
160 * is a child we are trying to kill and it really hasn't
161 * exited, we will likely fail to bind to the port
164 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR,
166 "could not make child process %ld exit, "
167 "attempting to continue anyway", (long)pid);
171 ap_check_other_child();
173 /* nothing left to wait for */
180 /* number of calls to wait_or_timeout between writable probes */
181 #ifndef INTERVAL_OF_WRITABLE_PROBES
182 #define INTERVAL_OF_WRITABLE_PROBES 10
184 static int wait_or_timeout_counter;
186 void ap_wait_or_timeout(ap_wait_t *status, ap_proc_t *ret, ap_pool_t *p)
191 ++wait_or_timeout_counter;
192 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
193 wait_or_timeout_counter = 0;
194 #ifdef APR_HAS_OTHER_CHILD
195 ap_probe_writable_fds();
198 rv = ap_wait_all_procs(ret, status, APR_NOWAIT, p);
199 if (ap_canonical_error(rv) == APR_EINTR) {
203 if (rv == APR_CHILD_DONE) {
207 if ((ret = reap_children(status)) > 0) {
211 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
212 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
213 ap_select(0, NULL, NULL, NULL, &tv);