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.
61 #include "apr_portable.h"
62 #include "apr_thread_proc.h"
63 #include "ap_config.h"
65 #include "http_main.h"
67 #include "http_config.h" /* for read_config */
68 #include "http_core.h" /* for get_remote_host */
69 #include "http_connection.h"
72 #include "iol_socket.h"
73 #include "ap_listen.h"
74 #include "scoreboard.h"
76 #ifdef HAVE_NETINET_TCP_H
77 #include <netinet/tcp.h>
84 * Actual definitions of config globals
87 int ap_threads_per_child=0; /* Worker threads per child */
88 int ap_max_requests_per_child=0;
89 static char *ap_pid_fname=NULL;
90 API_VAR_EXPORT char *ap_scoreboard_fname=NULL;
91 static int ap_daemons_to_start=0;
92 static int min_spare_threads=0;
93 static int max_spare_threads=0;
94 static int ap_daemons_limit=0;
95 static time_t ap_restart_time=0;
96 API_VAR_EXPORT int ap_extended_status = 0;
97 static int workers_may_exit = 0;
98 static int requests_this_child;
99 static int num_listensocks = 0;
100 static ap_socket_t **listensocks;
102 /* The structure used to pass unique initialization info to each thread */
107 ap_pool_t *tpool; /* "pthread" would be confusing */
111 * The max child slot ever assigned, preserved across restarts. Necessary
112 * to deal with MaxClients changes across SIGWINCH restarts. We use this
113 * value to optimize routines that have to scan the entire scoreboard.
115 static int max_daemons_limit = -1;
117 static char ap_coredump_dir[MAX_STRING_LEN];
119 static int pipe_of_death[2];
120 static pthread_mutex_t pipe_of_death_mutex;
122 /* *Non*-shared http_main globals... */
124 static server_rec *server_conf;
126 /* one_process --- debugging mode variable; can be set from the command line
127 * with the -X flag. If set, this gets you the child_main loop running
128 * in the process which originally started up (no detach, no make_child),
129 * which is a pretty nice debugging environment. (You'll get a SIGHUP
130 * early in standalone_main; just continue through. This is the server
131 * trying to kill off any child processes which it might have lying
132 * around --- Apache doesn't keep track of their pids, it just sends
133 * SIGHUP to the process group, ignoring it in the root process.
134 * Continue through and you'll be fine.).
137 static int one_process = 0;
140 int raise_sigstop_flags;
143 static ap_pool_t *pconf; /* Pool for config stuff */
144 static ap_pool_t *pchild; /* Pool for httpd child stuff */
146 static int my_pid; /* Linux getpid() doesn't work except in main thread. Use
148 /* Keep track of the number of worker threads currently active */
149 static int worker_thread_count;
150 static pthread_mutex_t worker_thread_count_mutex;
152 /* Locks for accept serialization */
153 static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;
154 static ap_lock_t *process_accept_mutex;
155 static char *lock_fname;
157 #ifdef NO_SERIALIZED_ACCEPT
158 #define SAFE_ACCEPT(stmt) APR_SUCCESS
160 #define SAFE_ACCEPT(stmt) (stmt)
164 /* Global, alas, so http_core can talk to us */
165 enum server_token_type ap_server_tokens = SrvTk_FULL;
167 API_EXPORT(const server_rec *) ap_get_server_conf(void)
169 return (server_conf);
172 API_EXPORT(int) ap_get_max_daemons(void)
174 return max_daemons_limit;
177 /* a clean exit from a child with proper cleanup */
178 static void clean_child_exit(int code) __attribute__ ((noreturn));
179 void clean_child_exit(int code)
182 ap_destroy_pool(pchild);
187 static void reclaim_child_processes(int terminate)
190 long int waittime = 1024 * 16; /* in usecs */
195 ap_sync_scoreboard_image();
197 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
198 /* don't want to hold up progress any more than
199 * necessary, but we need to allow children a few moments to exit.
200 * Set delay with an exponential backoff.
202 tv.tv_sec = waittime / 1000000;
203 tv.tv_usec = waittime % 1000000;
204 waittime = waittime * 4;
205 ap_select(0, NULL, NULL, NULL, &tv);
207 /* now see who is done */
209 for (i = 0; i < max_daemons_limit; ++i) {
210 int pid = ap_scoreboard_image->parent[i].pid;
212 if (pid == my_pid || pid == 0)
215 waitret = waitpid(pid, &status, WNOHANG);
216 if (waitret == pid || waitret == -1) {
217 ap_scoreboard_image->parent[i].pid = 0;
230 /* ok, now it's being annoying */
231 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
233 "child process %d still did not exit, sending a SIGTERM",
239 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
240 "child process %d still did not exit, sending a SIGKILL",
245 /* gave it our best shot, but alas... If this really
246 * is a child we are trying to kill and it really hasn't
247 * exited, we will likely fail to bind to the port
250 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
251 "could not make child process %d exit, "
252 "attempting to continue anyway", pid);
256 ap_check_other_child();
258 /* nothing left to wait for */
264 /* Finally, this routine is used by the caretaker process to wait for
268 /* number of calls to wait_or_timeout between writable probes */
269 #ifndef INTERVAL_OF_WRITABLE_PROBES
270 #define INTERVAL_OF_WRITABLE_PROBES 10
272 static int wait_or_timeout_counter;
274 static int wait_or_timeout(ap_wait_t *status)
279 ++wait_or_timeout_counter;
280 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
281 wait_or_timeout_counter = 0;
282 #ifdef HAS_OTHER_CHILD
283 probe_writable_fds();
286 ret = waitpid(-1, status, WNOHANG);
287 if (ret == -1 && errno == EINTR) {
293 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
294 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
295 ap_select(0, NULL, NULL, NULL, &tv);
299 /* handle all varieties of core dumping signals */
300 static void sig_coredump(int sig)
302 chdir(ap_coredump_dir);
303 ap_signal(sig, SIG_DFL);
305 /* At this point we've got sig blocked, because we're still inside
306 * the signal handler. When we leave the signal handler it will
307 * be unblocked, and we'll take the signal... and coredump or whatever
308 * is appropriate for this particular Unix. In addition the parent
309 * will see the real signal we received -- whereas if we called
310 * abort() here, the parent would only see SIGABRT.
314 static void just_die(int sig)
319 /*****************************************************************
320 * Connection structures and accounting...
323 /* volatile just in case */
324 static int volatile shutdown_pending;
325 static int volatile restart_pending;
326 static int volatile is_graceful;
327 ap_generation_t volatile ap_my_generation;
330 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
331 * functions to initiate shutdown or restart without relying on signals.
332 * Previously this was initiated in sig_term() and restart() signal handlers,
333 * but we want to be able to start a shutdown/restart from other sources --
334 * e.g. on Win32, from the service manager. Now the service manager can
335 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
336 * these functions can also be called by the child processes, since global
337 * variables are no longer used to pass on the required action to the parent.
339 * These should only be called from the parent process itself, since the
340 * parent process will use the shutdown_pending and restart_pending variables
341 * to determine whether to shutdown or restart. The child process should
342 * call signal_parent() directly to tell the parent to die -- this will
343 * cause neither of those variable to be set, which the parent will
344 * assume means something serious is wrong (which it will be, for the
345 * child to force an exit) and so do an exit anyway.
348 void ap_start_shutdown(void)
350 if (shutdown_pending == 1) {
351 /* Um, is this _probably_ not an error, if the user has
352 * tried to do a shutdown twice quickly, so we won't
353 * worry about reporting it.
357 shutdown_pending = 1;
360 /* do a graceful restart if graceful == 1 */
361 void ap_start_restart(int graceful)
364 if (restart_pending == 1) {
365 /* Probably not an error - don't bother reporting it */
369 is_graceful = graceful;
372 static void sig_term(int sig)
377 static void restart(int sig)
380 ap_start_restart(sig == SIGWINCH);
386 static void set_signals(void)
388 #ifndef NO_USE_SIGACTION
391 sigemptyset(&sa.sa_mask);
395 sa.sa_handler = sig_coredump;
396 #if defined(SA_ONESHOT)
397 sa.sa_flags = SA_ONESHOT;
398 #elif defined(SA_RESETHAND)
399 sa.sa_flags = SA_RESETHAND;
401 if (sigaction(SIGSEGV, &sa, NULL) < 0)
402 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGSEGV)");
404 if (sigaction(SIGBUS, &sa, NULL) < 0)
405 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGBUS)");
408 if (sigaction(SIGABORT, &sa, NULL) < 0)
409 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABORT)");
412 if (sigaction(SIGABRT, &sa, NULL) < 0)
413 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABRT)");
416 if (sigaction(SIGILL, &sa, NULL) < 0)
417 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGILL)");
421 sa.sa_handler = sig_term;
422 if (sigaction(SIGTERM, &sa, NULL) < 0)
423 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGTERM)");
425 if (sigaction(SIGINT, &sa, NULL) < 0)
426 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGINT)");
429 sa.sa_handler = SIG_DFL;
430 if (sigaction(SIGXCPU, &sa, NULL) < 0)
431 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXCPU)");
434 sa.sa_handler = SIG_DFL;
435 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
436 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXFSZ)");
439 sa.sa_handler = SIG_IGN;
440 if (sigaction(SIGPIPE, &sa, NULL) < 0)
441 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGPIPE)");
444 /* we want to ignore HUPs and WINCH while we're busy processing one */
445 sigaddset(&sa.sa_mask, SIGHUP);
446 sigaddset(&sa.sa_mask, SIGWINCH);
447 sa.sa_handler = restart;
448 if (sigaction(SIGHUP, &sa, NULL) < 0)
449 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGHUP)");
450 if (sigaction(SIGWINCH, &sa, NULL) < 0)
451 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGWINCH)");
454 ap_signal(SIGSEGV, sig_coredump);
456 ap_signal(SIGBUS, sig_coredump);
459 ap_signal(SIGABORT, sig_coredump);
460 #endif /* SIGABORT */
462 ap_signal(SIGABRT, sig_coredump);
465 ap_signal(SIGILL, sig_coredump);
468 ap_signal(SIGXCPU, SIG_DFL);
471 ap_signal(SIGXFSZ, SIG_DFL);
475 ap_signal(SIGTERM, sig_term);
477 ap_signal(SIGHUP, restart);
480 ap_signal(SIGWINCH, restart);
481 #endif /* SIGWINCH */
483 ap_signal(SIGPIPE, SIG_IGN);
489 static void process_child_status(int pid, ap_wait_t status)
491 /* Child died... if it died due to a fatal error,
492 * we should simply bail out.
494 if ((WIFEXITED(status)) &&
495 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
496 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, server_conf,
497 "Child %d returned a Fatal error... \n"
498 "Apache is exiting!",
500 exit(APEXIT_CHILDFATAL);
502 if (WIFSIGNALED(status)) {
503 switch (WTERMSIG(status)) {
512 if (WCOREDUMP(status)) {
513 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
515 "child pid %d exit signal %s (%d), "
516 "possible coredump in %s",
517 pid, (WTERMSIG(status) >= NumSIG) ? "" :
518 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
523 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
525 "child pid %d exit signal %s (%d)", pid,
526 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
531 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
533 "child pid %d exit signal %d",
534 pid, WTERMSIG(status));
540 static int setup_listeners(server_rec *s)
543 int num_listeners = 0;
544 if (ap_listen_open(s->process, s->port)) {
547 for (lr = ap_listeners; lr; lr = lr->next) {
550 return num_listeners;
553 /*****************************************************************
554 * Here follows a long bunch of generic server bookkeeping stuff...
557 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
558 static void sock_disable_nagle(int s)
560 /* The Nagle algorithm says that we should delay sending partial
561 * packets in hopes of getting more data. We don't want to do
562 * this; we are not telnet. There are bad interactions between
563 * persistent connections and Nagle's algorithm that have very severe
564 * performance penalties. (Failing to disable Nagle is not much of a
565 * problem with simple HTTP.)
567 * In spite of these problems, failure here is not a shooting offense.
571 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
573 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
574 "setsockopt: (TCP_NODELAY)");
579 #define sock_disable_nagle(s) /* NOOP */
582 int ap_graceful_stop_signalled(void)
584 /* XXX - Does this really work? - Manoj */
588 /*****************************************************************
589 * Child process main loop.
592 static void process_socket(ap_pool_t *p, ap_socket_t *sock, int my_child_num, int my_thread_num)
595 conn_rec *current_conn;
597 long conn_id = my_child_num * HARD_THREAD_LIMIT + my_thread_num;
600 (void) ap_get_os_sock(&csd, sock);
602 sock_disable_nagle(csd);
604 iol = unix_attach_socket(sock);
606 if (errno == EBADF) {
607 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
608 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
609 "found, you probably need to rebuild Apache with a "
610 "larger FD_SETSIZE", csd, FD_SETSIZE);
613 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, NULL,
614 "error attaching to socket");
616 ap_close_socket(sock);
620 (void) ap_update_child_status(my_child_num, my_thread_num,
621 SERVER_BUSY_READ, (request_rec *) NULL);
622 conn_io = ap_bcreate(p, B_RDWR);
623 ap_bpush_iol(conn_io, iol);
625 current_conn = ap_new_apr_connection(p, server_conf, conn_io, sock,
628 ap_process_connection(current_conn);
630 /* Sets workers_may_exit if we received a character on the pipe_of_death */
631 static void check_pipe_of_death(void)
633 pthread_mutex_lock(&pipe_of_death_mutex);
634 if (!workers_may_exit) {
639 ret = ap_recv(listensocks[0], &pipe_read_char, &n);
640 if (ret == APR_EAGAIN) {
641 /* It lost the lottery. It must continue to suffer
642 * through a life of servitude. */
645 /* It won the lottery (or something else is very
646 * wrong). Embrace death with open arms. */
647 workers_may_exit = 1;
650 pthread_mutex_unlock(&pipe_of_death_mutex);
653 static void * worker_thread(void * dummy)
655 proc_info * ti = dummy;
656 int process_slot = ti->pid;
657 int thread_slot = ti->tid;
658 ap_pool_t *tpool = ti->tpool;
659 ap_socket_t *csd = NULL;
660 ap_pool_t *ptrans; /* Pool for per-transaction stuff */
661 ap_socket_t *sd = NULL;
663 int curr_pollfd, last_pollfd = 0;
664 ap_pollfd_t *pollset;
669 ap_create_pool(&ptrans, tpool);
671 pthread_mutex_lock(&worker_thread_count_mutex);
672 worker_thread_count++;
673 pthread_mutex_unlock(&worker_thread_count_mutex);
675 ap_setup_poll(&pollset, num_listensocks+1, tpool);
676 for(n=0 ; n <= num_listensocks ; ++n)
677 ap_add_poll_socket(pollset, listensocks[n], APR_POLLIN);
679 /* TODO: Switch to a system where threads reuse the results from earlier
680 poll calls - manoj */
681 while (!workers_may_exit) {
682 workers_may_exit |= (ap_max_requests_per_child != 0) && (requests_this_child <= 0);
683 if (workers_may_exit) break;
685 (void) ap_update_child_status(process_slot, thread_slot, SERVER_READY,
686 (request_rec *) NULL);
687 pthread_mutex_lock(&thread_accept_mutex);
688 if (workers_may_exit) {
689 pthread_mutex_unlock(&thread_accept_mutex);
692 if ((rv = SAFE_ACCEPT(ap_lock(process_accept_mutex)))
694 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
695 "ap_lock failed. Attempting to shutdown "
696 "process gracefully.");
697 workers_may_exit = 1;
700 while (!workers_may_exit) {
704 ret = ap_poll(pollset, &n, -1);
705 if (ret != APR_SUCCESS) {
706 if (ret == APR_EINTR) {
710 /* poll() will only return errors in catastrophic
711 * circumstances. Let's try exiting gracefully, for now. */
712 ap_log_error(APLOG_MARK, APLOG_ERR, errno, (const server_rec *)
713 ap_get_server_conf(), "poll: (listen)");
714 workers_may_exit = 1;
717 if (workers_may_exit) break;
719 ap_get_revents(&event, listensocks[0], pollset);
720 if (event & APR_POLLIN) {
721 /* A process got a signal on the shutdown pipe. Check if we're
722 * the lucky process to die. */
723 check_pipe_of_death();
727 if (num_listensocks == 1) {
728 sd = ap_listeners->sd;
732 /* find a listener */
733 curr_pollfd = last_pollfd;
736 if (curr_pollfd > num_listensocks) {
739 /* XXX: Should we check for POLLERR? */
740 ap_get_revents(&event, listensocks[curr_pollfd], pollset);
741 if (event & APR_POLLIN) {
742 last_pollfd = curr_pollfd;
743 sd=listensocks[curr_pollfd];
746 } while (curr_pollfd != last_pollfd);
750 if (!workers_may_exit) {
751 ap_accept(&csd, sd, ptrans);
752 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
754 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
755 "ap_unlock failed. Attempting to shutdown "
756 "process gracefully.");
757 workers_may_exit = 1;
759 pthread_mutex_unlock(&thread_accept_mutex);
760 process_socket(ptrans, csd, process_slot, thread_slot);
761 requests_this_child--;
764 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
766 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
767 "ap_unlock failed. Attempting to shutdown "
768 "process gracefully.");
769 workers_may_exit = 1;
771 pthread_mutex_unlock(&thread_accept_mutex);
774 ap_clear_pool(ptrans);
777 ap_destroy_pool(tpool);
778 ap_update_child_status(process_slot, thread_slot, SERVER_DEAD,
779 (request_rec *) NULL);
780 pthread_mutex_lock(&worker_thread_count_mutex);
781 worker_thread_count--;
782 if (worker_thread_count == 0) {
783 /* All the threads have exited, now finish the shutdown process
784 * by signalling the sigwait thread */
785 kill(my_pid, SIGTERM);
787 pthread_mutex_unlock(&worker_thread_count_mutex);
793 static void child_main(int child_num_arg)
798 pthread_attr_t thread_attr;
800 int my_child_num = child_num_arg;
801 proc_info *my_info = NULL;
807 ap_create_pool(&pchild, pconf);
809 /*stuff to do before we switch id's, so we have permissions.*/
810 reopen_scoreboard(pchild);
812 rv = SAFE_ACCEPT(ap_child_init_lock(&process_accept_mutex, lock_fname,
814 if (rv != APR_SUCCESS) {
815 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
816 "Couldn't initialize cross-process lock in child");
817 clean_child_exit(APEXIT_CHILDFATAL);
820 if (unixd_setup_child()) {
821 clean_child_exit(APEXIT_CHILDFATAL);
824 ap_child_init_hook(pchild, server_conf);
826 /*done with init critical section */
828 /* All threads should mask signals out, accoring to sigwait(2) man page */
829 sigfillset(&sig_mask);
831 if (pthread_sigmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
832 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf, "pthread_sigmask");
835 requests_this_child = ap_max_requests_per_child;
837 /* Set up the pollfd array */
838 listensocks = ap_palloc(pchild,
839 sizeof(*listensocks) * (num_listensocks + 1));
840 ap_create_tcp_socket(&listensocks[0], pchild);
841 ap_put_os_sock(&listensocks[0], &pipe_of_death[0], pchild);
842 for (lr = ap_listeners, i = 1; i <= num_listensocks; lr = lr->next, ++i)
843 listensocks[i]=lr->sd;
845 /* Setup worker threads */
847 worker_thread_count = 0;
848 pthread_mutex_init(&worker_thread_count_mutex, NULL);
849 pthread_mutex_init(&pipe_of_death_mutex, NULL);
850 pthread_attr_init(&thread_attr);
851 pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
852 for (i=0; i < ap_threads_per_child; i++) {
854 my_info = (proc_info *)malloc(sizeof(proc_info));
855 if (my_info == NULL) {
856 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
857 "malloc: out of memory");
858 clean_child_exit(APEXIT_CHILDFATAL);
860 my_info->pid = my_child_num;
863 ap_create_pool(&my_info->tpool, pchild);
865 /* We are creating threads right now */
866 (void) ap_update_child_status(my_child_num, i, SERVER_STARTING,
867 (request_rec *) NULL);
869 if (pthread_create(&thread, &thread_attr, worker_thread, my_info)) {
870 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
871 "pthread_create: unable to create worker thread");
872 /* In case system resources are maxxed out, we don't want
873 Apache running away with the CPU trying to fork over and
874 over and over again if we exit. */
876 clean_child_exit(APEXIT_CHILDFATAL);
879 worker_thread(my_info);
880 /* The SIGTERM shouldn't let us reach this point, but just in case... */
881 clean_child_exit(APEXIT_OK);
884 /* We let each thread update it's own scoreboard entry. This is done
885 * because it let's us deal with tid better.
889 pthread_attr_destroy(&thread_attr);
891 /* This thread will be the one responsible for handling signals */
892 sigemptyset(&sig_mask);
893 sigaddset(&sig_mask, SIGTERM);
894 sigaddset(&sig_mask, SIGINT);
895 sigwait(&sig_mask, &signal_received);
896 switch (signal_received) {
899 just_die(signal_received);
902 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
903 "received impossible signal: %d", signal_received);
908 static int make_child(server_rec *s, int slot, time_t now)
912 if (slot + 1 > max_daemons_limit) {
913 max_daemons_limit = slot + 1;
918 ap_scoreboard_image->parent[slot].pid = getpid();
922 /* Tag this slot as occupied so that perform_idle_server_maintenance
923 * doesn't try to steal it */
924 (void) ap_update_child_status(slot, 0, SERVER_STARTING, (request_rec *) NULL);
926 if ((pid = fork()) == -1) {
927 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
929 /* fork didn't succeed. Fix the scoreboard or else
930 * it will say SERVER_STARTING forever and ever
932 (void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL);
934 /* In case system resources are maxxed out, we don't want
935 Apache running away with the CPU trying to fork over and
936 over and over again. */
943 #ifdef AIX_BIND_PROCESSOR
944 /* By default, AIX binds to a single processor. This bit unbinds
945 children which will then bind to another CPU.
947 #include <sys/processor.h>
948 int status = bindprocessor(BINDPROCESS, (int)getpid(),
949 PROCESSOR_CLASS_ANY);
951 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
952 "processor unbind failed %d", status);
955 RAISE_SIGSTOP(MAKE_CHILD);
957 ap_signal(SIGTERM, just_die);
963 ap_scoreboard_image->parent[slot].pid = pid;
967 /* start up a bunch of children */
968 static void startup_children(int number_to_start)
972 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
973 if (ap_scoreboard_image->parent[i].pid != 0) {
976 if (make_child(server_conf, i, 0) < 0) {
985 * idle_spawn_rate is the number of children that will be spawned on the
986 * next maintenance cycle if there aren't enough idle servers. It is
987 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
988 * without the need to spawn.
990 static int idle_spawn_rate = 1;
991 #ifndef MAX_SPAWN_RATE
992 #define MAX_SPAWN_RATE (32)
994 static int hold_off_on_exponential_spawning;
996 static void perform_idle_server_maintenance(void)
999 int idle_thread_count;
1003 int free_slots[MAX_SPAWN_RATE];
1007 /* initialize the free_list */
1010 idle_thread_count = 0;
1014 ap_sync_scoreboard_image();
1015 for (i = 0; i < ap_daemons_limit; ++i) {
1016 /* Initialization to satisfy the compiler. It doesn't know
1017 * that ap_threads_per_child is always > 0 */
1018 int status = SERVER_DEAD;
1019 int any_dying_threads = 0;
1020 int all_dead_threads = 1;
1021 int idle_thread_addition = 0;
1023 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
1025 for (j = 0; j < ap_threads_per_child; j++) {
1026 ss = &ap_scoreboard_image->servers[i][j];
1027 status = ss->status;
1029 any_dying_threads = any_dying_threads || (status == SERVER_DEAD)
1030 || (status == SERVER_GRACEFUL);
1031 all_dead_threads = all_dead_threads && (status == SERVER_DEAD);
1033 /* We consider a starting server as idle because we started it
1034 * at least a cycle ago, and if it still hasn't finished starting
1035 * then we're just going to swamp things worse by forking more.
1036 * So we hopefully won't need to fork more if we count it.
1037 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
1039 if (status <= SERVER_READY) {
1040 ++idle_thread_addition;
1043 if (all_dead_threads && free_length < idle_spawn_rate) {
1044 free_slots[free_length] = i;
1047 if (!all_dead_threads) {
1050 if (!any_dying_threads) {
1052 idle_thread_count += idle_thread_addition;
1055 max_daemons_limit = last_non_dead + 1;
1057 if (idle_thread_count > max_spare_threads) {
1058 /* Kill off one child */
1059 char char_of_death = '!';
1060 if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
1061 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "write pipe_of_death");
1063 idle_spawn_rate = 1;
1065 else if (idle_thread_count < min_spare_threads) {
1066 /* terminate the free list */
1067 if (free_length == 0) {
1068 /* only report this condition once */
1069 static int reported = 0;
1072 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
1073 "server reached MaxClients setting, consider"
1074 " raising the MaxClients setting");
1077 idle_spawn_rate = 1;
1081 if (idle_spawn_rate >= 8) {
1082 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
1083 "server seems busy, (you may need "
1084 "to increase StartServers, ThreadsPerChild "
1085 "or Min/MaxSparetThreads), "
1086 "spawning %d children, there are around %d idle "
1087 "threads, and %d total children", idle_spawn_rate,
1088 idle_thread_count, total_non_dead);
1090 for (i = 0; i < free_length; ++i) {
1091 make_child(server_conf, free_slots[i], now);
1093 /* the next time around we want to spawn twice as many if this
1094 * wasn't good enough, but not if we've just done a graceful
1096 if (hold_off_on_exponential_spawning) {
1097 --hold_off_on_exponential_spawning;
1099 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
1100 idle_spawn_rate *= 2;
1105 idle_spawn_rate = 1;
1109 static void server_main_loop(int remaining_children_to_start)
1116 while (!restart_pending && !shutdown_pending) {
1117 pid = wait_or_timeout(&status);
1120 process_child_status(pid, status);
1121 /* non-fatal death... note that it's gone in the scoreboard. */
1122 child_slot = find_child_by_pid(pid);
1123 if (child_slot >= 0) {
1124 ap_mpmt_pthread_force_reset_connection_status(child_slot);
1125 for (i = 0; i < ap_threads_per_child; i++)
1126 ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL);
1128 if (remaining_children_to_start
1129 && child_slot < ap_daemons_limit) {
1130 /* we're still doing a 1-for-1 replacement of dead
1131 * children with new children
1133 make_child(server_conf, child_slot, time(NULL));
1134 --remaining_children_to_start;
1136 #ifdef HAS_OTHER_CHILD
1138 else if (reap_other_child(pid, status) == 0) {
1142 else if (is_graceful) {
1143 /* Great, we've probably just lost a slot in the
1144 * scoreboard. Somehow we don't know about this
1147 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, server_conf,
1148 "long lost child came home! (pid %d)", pid);
1150 /* Don't perform idle maintenance when a child dies,
1151 * only do it when there's a timeout. Remember only a
1152 * finite number of children can die, and it's pretty
1153 * pathological for a lot to die suddenly.
1157 else if (remaining_children_to_start) {
1158 /* we hit a 1 second timeout in which none of the previous
1159 * generation of children needed to be reaped... so assume
1160 * they're all done, and pick up the slack if any is left.
1162 startup_children(remaining_children_to_start);
1163 remaining_children_to_start = 0;
1164 /* In any event we really shouldn't do the code below because
1165 * few of the servers we just started are in the IDLE state
1166 * yet, so we'd mistakenly create an extra server.
1171 perform_idle_server_maintenance();
1175 int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
1177 int remaining_children_to_start;
1182 if (pipe(pipe_of_death) == -1) {
1183 ap_log_error(APLOG_MARK, APLOG_ERR, errno,
1184 (const server_rec*) server_conf,
1185 "pipe: (pipe_of_death)");
1189 if (fcntl(pipe_of_death[0], F_SETFD, O_NONBLOCK) == -1) {
1190 ap_log_error(APLOG_MARK, APLOG_ERR, errno,
1191 (const server_rec*) server_conf,
1192 "fcntl: O_NONBLOCKing (pipe_of_death)");
1196 if ((num_listensocks = setup_listeners(server_conf)) < 1) {
1197 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1198 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1199 "no listening sockets available, shutting down");
1202 ap_log_pid(pconf, ap_pid_fname);
1204 /* Initialize cross-process accept lock */
1205 lock_fname = ap_psprintf(_pconf, "%s.%lu",
1206 ap_server_root_relative(_pconf, lock_fname),
1208 rv = ap_create_lock(&process_accept_mutex, APR_MUTEX, APR_CROSS_PROCESS,
1209 lock_fname, _pconf);
1210 if (rv != APR_SUCCESS) {
1211 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1212 "Couldn't create cross-process lock");
1218 reinit_scoreboard(pconf);
1222 /* Don't thrash... */
1223 if (max_spare_threads < min_spare_threads + ap_threads_per_child)
1224 max_spare_threads = min_spare_threads + ap_threads_per_child;
1226 /* If we're doing a graceful_restart then we're going to see a lot
1227 * of children exiting immediately when we get into the main loop
1228 * below (because we just sent them SIGWINCH). This happens pretty
1229 * rapidly... and for each one that exits we'll start a new one until
1230 * we reach at least daemons_min_free. But we may be permitted to
1231 * start more than that, so we'll just keep track of how many we're
1232 * supposed to start up without the 1 second penalty between each fork.
1234 remaining_children_to_start = ap_daemons_to_start;
1235 if (remaining_children_to_start > ap_daemons_limit) {
1236 remaining_children_to_start = ap_daemons_limit;
1239 startup_children(remaining_children_to_start);
1240 remaining_children_to_start = 0;
1243 /* give the system some time to recover before kicking into
1244 * exponential mode */
1245 hold_off_on_exponential_spawning = 10;
1248 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1249 "%s configured -- resuming normal operations",
1250 ap_get_server_version());
1251 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
1252 "Server built: %s", ap_get_server_built());
1253 restart_pending = shutdown_pending = 0;
1255 server_main_loop(remaining_children_to_start);
1257 if (shutdown_pending) {
1258 /* Time to gracefully shut down:
1259 * Kill child processes, tell them to call child_exit, etc...
1261 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1262 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGTERM");
1264 reclaim_child_processes(1); /* Start with SIGTERM */
1266 /* cleanup pid file on normal shutdown */
1268 const char *pidfile = NULL;
1269 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1270 if ( pidfile != NULL && unlink(pidfile) == 0)
1271 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1273 "removed PID file %s (pid=%ld)",
1274 pidfile, (long)getpid());
1277 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1278 "caught SIGTERM, shutting down");
1283 /* we've been told to restart */
1284 ap_signal(SIGHUP, SIG_IGN);
1287 /* not worth thinking about */
1291 /* advance to the next generation */
1292 /* XXX: we really need to make sure this new generation number isn't in
1293 * use by any of the children.
1296 ap_scoreboard_image->global.running_generation = ap_my_generation;
1297 update_scoreboard_global();
1301 char char_of_death = '!';
1303 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1304 "SIGWINCH received. Doing graceful restart");
1306 /* give the children the signal to die */
1307 for (i = 0; i < ap_daemons_limit;) {
1308 if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
1309 if (errno == EINTR) continue;
1310 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "write pipe_of_death");
1315 /* This is mostly for debugging... so that we know what is still
1316 * gracefully dealing with existing request.
1319 for (i = 0; i < ap_daemons_limit; ++i) {
1320 for (j = 0; j < ap_threads_per_child; j++) {
1321 if (ap_scoreboard_image->servers[i][j].status != SERVER_DEAD) {
1322 ap_scoreboard_image->servers[i][j].status = SERVER_GRACEFUL;
1328 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1329 * and a SIGHUP, we may as well use the same signal, because some user
1330 * pthreads are stealing signals from us left and right.
1332 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1333 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGTERM");
1335 reclaim_child_processes(1); /* Start with SIGTERM */
1336 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1337 "SIGHUP received. Attempting to restart");
1340 ap_restart_time = time(NULL);
1345 static void mpmt_pthread_pre_config(ap_pool_t *pconf, ap_pool_t *plog, ap_pool_t *ptemp)
1347 static int restart_num = 0;
1349 one_process = !!getenv("ONE_PROCESS");
1351 /* sigh, want this only the second time around */
1352 if (restart_num++ == 1) {
1362 ap_listen_pre_config();
1363 ap_daemons_to_start = DEFAULT_START_DAEMON;
1364 min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
1365 max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
1366 ap_daemons_limit = HARD_SERVER_LIMIT;
1367 ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
1368 ap_pid_fname = DEFAULT_PIDLOG;
1369 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1370 lock_fname = DEFAULT_LOCKFILE;
1371 ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1372 ap_extended_status = 0;
1374 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1377 static void mpmt_pthread_hooks(void)
1384 static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
1386 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1391 if (cmd->server->is_virtual) {
1392 return "PidFile directive not allowed in <VirtualHost>";
1398 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
1400 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1405 ap_scoreboard_fname = arg;
1409 static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
1411 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1420 static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
1422 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1427 ap_daemons_to_start = atoi(arg);
1431 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, char *arg)
1433 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1438 min_spare_threads = atoi(arg);
1439 if (min_spare_threads <= 0) {
1440 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1441 "WARNING: detected MinSpareThreads set to non-positive.");
1442 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1443 "Resetting to 1 to avoid almost certain Apache failure.");
1444 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1445 "Please read the documentation.");
1446 min_spare_threads = 1;
1452 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, char *arg)
1454 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1459 max_spare_threads = atoi(arg);
1463 static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
1465 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1470 ap_daemons_limit = atoi(arg);
1471 if (ap_daemons_limit > HARD_SERVER_LIMIT) {
1472 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1473 "WARNING: MaxClients of %d exceeds compile time limit "
1474 "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
1475 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1476 " lowering MaxClients to %d. To increase, please "
1477 "see the", HARD_SERVER_LIMIT);
1478 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1479 " HARD_SERVER_LIMIT define in src/include/httpd.h.");
1480 ap_daemons_limit = HARD_SERVER_LIMIT;
1482 else if (ap_daemons_limit < 1) {
1483 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1\n");
1484 ap_daemons_limit = 1;
1489 static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, char *arg)
1491 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1496 ap_threads_per_child = atoi(arg);
1497 if (ap_threads_per_child > HARD_THREAD_LIMIT) {
1498 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1499 "WARNING: ThreadsPerChild of %d exceeds compile time"
1500 "limit of %d threads,", ap_threads_per_child,
1502 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1503 " lowering ThreadsPerChild to %d. To increase, please"
1504 "see the", HARD_THREAD_LIMIT);
1505 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1506 " HARD_THREAD_LIMIT define in src/include/httpd.h.");
1508 else if (ap_threads_per_child < 1) {
1509 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1510 "WARNING: Require ThreadsPerChild > 0, setting to 1");
1511 ap_threads_per_child = 1;
1516 static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
1518 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1523 ap_max_requests_per_child = atoi(arg);
1528 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
1532 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1537 fname = ap_server_root_relative(cmd->pool, arg);
1538 if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
1539 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1540 " does not exist or is not a directory", NULL);
1542 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1546 static const command_rec mpmt_pthread_cmds[] = {
1547 UNIX_DAEMON_COMMANDS
1549 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
1550 "A file for logging the server process ID"},
1551 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
1552 "A file for Apache to maintain runtime process management information"},
1553 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
1554 "The lockfile used when Apache needs to lock the accept() call"},
1555 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
1556 "Number of child processes launched at server startup" },
1557 { "MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF, TAKE1,
1558 "Minimum number of idle children, to handle request spikes" },
1559 { "MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF, TAKE1,
1560 "Maximum number of idle children" },
1561 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
1562 "Maximum number of children alive at the same time" },
1563 { "ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF, TAKE1,
1564 "Number of threads each child creates" },
1565 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
1566 "Maximum number of requests a particular child serves before dying." },
1567 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
1568 "The location of the directory Apache changes to before dumping core" },
1572 module MODULE_VAR_EXPORT mpm_mpmt_pthread_module = {
1574 mpmt_pthread_pre_config, /* run hook before the configuration is read */
1575 NULL, /* create per-directory config structure */
1576 NULL, /* merge per-directory config structures */
1577 NULL, /* create per-server config structure */
1578 NULL, /* merge per-server config structures */
1579 mpmt_pthread_cmds, /* command ap_table_t */
1580 NULL, /* handlers */
1581 mpmt_pthread_hooks /* register_hooks */