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 ap_proc_t *wait_or_timeout(ap_wait_t *status, ap_pool_t *p)
278 ap_proc_t *ret = NULL;
280 ++wait_or_timeout_counter;
281 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
282 wait_or_timeout_counter = 0;
283 #ifdef APR_HAS_OTHER_CHILD
284 ap_probe_writable_fds();
287 rv = ap_wait_all_procs(&ret, status, APR_NOWAIT, p);
288 if (ap_canonical_error(rv) == APR_EINTR) {
291 if (rv == APR_CHILD_DONE) {
295 if ((ret = reap_children(status)) > 0) {
299 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
300 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
301 ap_select(0, NULL, NULL, NULL, &tv);
305 /* handle all varieties of core dumping signals */
306 static void sig_coredump(int sig)
308 chdir(ap_coredump_dir);
309 ap_signal(sig, SIG_DFL);
311 /* At this point we've got sig blocked, because we're still inside
312 * the signal handler. When we leave the signal handler it will
313 * be unblocked, and we'll take the signal... and coredump or whatever
314 * is appropriate for this particular Unix. In addition the parent
315 * will see the real signal we received -- whereas if we called
316 * abort() here, the parent would only see SIGABRT.
320 static void just_die(int sig)
325 /*****************************************************************
326 * Connection structures and accounting...
329 /* volatile just in case */
330 static int volatile shutdown_pending;
331 static int volatile restart_pending;
332 static int volatile is_graceful;
333 ap_generation_t volatile ap_my_generation;
336 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
337 * functions to initiate shutdown or restart without relying on signals.
338 * Previously this was initiated in sig_term() and restart() signal handlers,
339 * but we want to be able to start a shutdown/restart from other sources --
340 * e.g. on Win32, from the service manager. Now the service manager can
341 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
342 * these functions can also be called by the child processes, since global
343 * variables are no longer used to pass on the required action to the parent.
345 * These should only be called from the parent process itself, since the
346 * parent process will use the shutdown_pending and restart_pending variables
347 * to determine whether to shutdown or restart. The child process should
348 * call signal_parent() directly to tell the parent to die -- this will
349 * cause neither of those variable to be set, which the parent will
350 * assume means something serious is wrong (which it will be, for the
351 * child to force an exit) and so do an exit anyway.
354 void ap_start_shutdown(void)
356 if (shutdown_pending == 1) {
357 /* Um, is this _probably_ not an error, if the user has
358 * tried to do a shutdown twice quickly, so we won't
359 * worry about reporting it.
363 shutdown_pending = 1;
366 /* do a graceful restart if graceful == 1 */
367 void ap_start_restart(int graceful)
370 if (restart_pending == 1) {
371 /* Probably not an error - don't bother reporting it */
375 is_graceful = graceful;
378 static void sig_term(int sig)
383 static void restart(int sig)
386 ap_start_restart(sig == SIGWINCH);
392 static void set_signals(void)
394 #ifndef NO_USE_SIGACTION
397 sigemptyset(&sa.sa_mask);
401 sa.sa_handler = sig_coredump;
402 #if defined(SA_ONESHOT)
403 sa.sa_flags = SA_ONESHOT;
404 #elif defined(SA_RESETHAND)
405 sa.sa_flags = SA_RESETHAND;
407 if (sigaction(SIGSEGV, &sa, NULL) < 0)
408 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGSEGV)");
410 if (sigaction(SIGBUS, &sa, NULL) < 0)
411 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGBUS)");
414 if (sigaction(SIGABORT, &sa, NULL) < 0)
415 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABORT)");
418 if (sigaction(SIGABRT, &sa, NULL) < 0)
419 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABRT)");
422 if (sigaction(SIGILL, &sa, NULL) < 0)
423 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGILL)");
427 sa.sa_handler = sig_term;
428 if (sigaction(SIGTERM, &sa, NULL) < 0)
429 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGTERM)");
431 if (sigaction(SIGINT, &sa, NULL) < 0)
432 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGINT)");
435 sa.sa_handler = SIG_DFL;
436 if (sigaction(SIGXCPU, &sa, NULL) < 0)
437 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXCPU)");
440 sa.sa_handler = SIG_DFL;
441 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
442 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXFSZ)");
445 sa.sa_handler = SIG_IGN;
446 if (sigaction(SIGPIPE, &sa, NULL) < 0)
447 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGPIPE)");
450 /* we want to ignore HUPs and WINCH while we're busy processing one */
451 sigaddset(&sa.sa_mask, SIGHUP);
452 sigaddset(&sa.sa_mask, SIGWINCH);
453 sa.sa_handler = restart;
454 if (sigaction(SIGHUP, &sa, NULL) < 0)
455 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGHUP)");
456 if (sigaction(SIGWINCH, &sa, NULL) < 0)
457 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGWINCH)");
460 ap_signal(SIGSEGV, sig_coredump);
462 ap_signal(SIGBUS, sig_coredump);
465 ap_signal(SIGABORT, sig_coredump);
466 #endif /* SIGABORT */
468 ap_signal(SIGABRT, sig_coredump);
471 ap_signal(SIGILL, sig_coredump);
474 ap_signal(SIGXCPU, SIG_DFL);
477 ap_signal(SIGXFSZ, SIG_DFL);
481 ap_signal(SIGTERM, sig_term);
483 ap_signal(SIGHUP, restart);
486 ap_signal(SIGWINCH, restart);
487 #endif /* SIGWINCH */
489 ap_signal(SIGPIPE, SIG_IGN);
495 static void process_child_status(ap_proc_t *abs_pid, ap_wait_t status)
498 ap_get_os_proc(&pid, abs_pid);
499 /* Child died... if it died due to a fatal error,
500 * we should simply bail out.
502 if ((WIFEXITED(status)) &&
503 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
504 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, server_conf,
505 "Child %d returned a Fatal error... \n"
506 "Apache is exiting!",
508 exit(APEXIT_CHILDFATAL);
510 if (WIFSIGNALED(status)) {
511 switch (WTERMSIG(status)) {
520 if (WCOREDUMP(status)) {
521 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
523 "child pid %d exit signal %s (%d), "
524 "possible coredump in %s",
525 pid, (WTERMSIG(status) >= NumSIG) ? "" :
526 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
531 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
533 "child pid %d exit signal %s (%d)", pid,
534 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
539 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
541 "child pid %d exit signal %d",
542 pid, WTERMSIG(status));
548 static int setup_listeners(server_rec *s)
551 int num_listeners = 0;
552 if (ap_listen_open(s->process, s->port)) {
555 for (lr = ap_listeners; lr; lr = lr->next) {
558 return num_listeners;
561 /*****************************************************************
562 * Here follows a long bunch of generic server bookkeeping stuff...
565 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
566 static void sock_disable_nagle(int s)
568 /* The Nagle algorithm says that we should delay sending partial
569 * packets in hopes of getting more data. We don't want to do
570 * this; we are not telnet. There are bad interactions between
571 * persistent connections and Nagle's algorithm that have very severe
572 * performance penalties. (Failing to disable Nagle is not much of a
573 * problem with simple HTTP.)
575 * In spite of these problems, failure here is not a shooting offense.
579 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
581 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
582 "setsockopt: (TCP_NODELAY)");
587 #define sock_disable_nagle(s) /* NOOP */
590 int ap_graceful_stop_signalled(void)
592 /* XXX - Does this really work? - Manoj */
596 /*****************************************************************
597 * Child process main loop.
600 static void process_socket(ap_pool_t *p, ap_socket_t *sock, int my_child_num, int my_thread_num)
603 conn_rec *current_conn;
605 long conn_id = my_child_num * HARD_THREAD_LIMIT + my_thread_num;
608 (void) ap_get_os_sock(&csd, sock);
610 sock_disable_nagle(csd);
612 iol = unix_attach_socket(sock);
614 if (errno == EBADF) {
615 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
616 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
617 "found, you probably need to rebuild Apache with a "
618 "larger FD_SETSIZE", csd, FD_SETSIZE);
621 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, NULL,
622 "error attaching to socket");
624 ap_close_socket(sock);
628 (void) ap_update_child_status(my_child_num, my_thread_num,
629 SERVER_BUSY_READ, (request_rec *) NULL);
630 conn_io = ap_bcreate(p, B_RDWR);
631 ap_bpush_iol(conn_io, iol);
633 current_conn = ap_new_apr_connection(p, server_conf, conn_io, sock,
636 ap_process_connection(current_conn);
637 ap_lingering_close(current_conn);
639 /* Sets workers_may_exit if we received a character on the pipe_of_death */
640 static void check_pipe_of_death(void)
642 pthread_mutex_lock(&pipe_of_death_mutex);
643 if (!workers_may_exit) {
648 ret = ap_recv(listensocks[0], &pipe_read_char, &n);
649 if (ap_canonical_error(ret) == APR_EAGAIN) {
650 /* It lost the lottery. It must continue to suffer
651 * through a life of servitude. */
654 /* It won the lottery (or something else is very
655 * wrong). Embrace death with open arms. */
656 workers_may_exit = 1;
659 pthread_mutex_unlock(&pipe_of_death_mutex);
662 static void * worker_thread(void * dummy)
664 proc_info * ti = dummy;
665 int process_slot = ti->pid;
666 int thread_slot = ti->tid;
667 ap_pool_t *tpool = ti->tpool;
668 ap_socket_t *csd = NULL;
669 ap_pool_t *ptrans; /* Pool for per-transaction stuff */
670 ap_socket_t *sd = NULL;
672 int curr_pollfd, last_pollfd = 0;
673 ap_pollfd_t *pollset;
678 ap_create_pool(&ptrans, tpool);
680 pthread_mutex_lock(&worker_thread_count_mutex);
681 worker_thread_count++;
682 pthread_mutex_unlock(&worker_thread_count_mutex);
684 ap_setup_poll(&pollset, num_listensocks+1, tpool);
685 for(n=0 ; n <= num_listensocks ; ++n)
686 ap_add_poll_socket(pollset, listensocks[n], APR_POLLIN);
688 /* TODO: Switch to a system where threads reuse the results from earlier
689 poll calls - manoj */
690 while (!workers_may_exit) {
691 workers_may_exit |= (ap_max_requests_per_child != 0) && (requests_this_child <= 0);
692 if (workers_may_exit) break;
694 (void) ap_update_child_status(process_slot, thread_slot, SERVER_READY,
695 (request_rec *) NULL);
696 pthread_mutex_lock(&thread_accept_mutex);
697 if (workers_may_exit) {
698 pthread_mutex_unlock(&thread_accept_mutex);
701 if ((rv = SAFE_ACCEPT(ap_lock(process_accept_mutex)))
703 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
704 "ap_lock failed. Attempting to shutdown "
705 "process gracefully.");
706 workers_may_exit = 1;
709 while (!workers_may_exit) {
713 ret = ap_poll(pollset, &n, -1);
714 if (ret != APR_SUCCESS) {
715 if (ret == APR_EINTR) {
719 /* poll() will only return errors in catastrophic
720 * circumstances. Let's try exiting gracefully, for now. */
721 ap_log_error(APLOG_MARK, APLOG_ERR, errno, (const server_rec *)
722 ap_get_server_conf(), "poll: (listen)");
723 workers_may_exit = 1;
726 if (workers_may_exit) break;
728 ap_get_revents(&event, listensocks[0], pollset);
729 if (event & APR_POLLIN) {
730 /* A process got a signal on the shutdown pipe. Check if we're
731 * the lucky process to die. */
732 check_pipe_of_death();
736 if (num_listensocks == 1) {
737 sd = ap_listeners->sd;
741 /* find a listener */
742 curr_pollfd = last_pollfd;
745 if (curr_pollfd > num_listensocks) {
748 /* XXX: Should we check for POLLERR? */
749 ap_get_revents(&event, listensocks[curr_pollfd], pollset);
750 if (event & APR_POLLIN) {
751 last_pollfd = curr_pollfd;
752 sd=listensocks[curr_pollfd];
755 } while (curr_pollfd != last_pollfd);
759 if (!workers_may_exit) {
760 ap_accept(&csd, sd, ptrans);
761 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
763 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
764 "ap_unlock failed. Attempting to shutdown "
765 "process gracefully.");
766 workers_may_exit = 1;
768 pthread_mutex_unlock(&thread_accept_mutex);
769 process_socket(ptrans, csd, process_slot, thread_slot);
770 requests_this_child--;
773 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
775 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
776 "ap_unlock failed. Attempting to shutdown "
777 "process gracefully.");
778 workers_may_exit = 1;
780 pthread_mutex_unlock(&thread_accept_mutex);
783 ap_clear_pool(ptrans);
786 ap_destroy_pool(tpool);
787 ap_update_child_status(process_slot, thread_slot, SERVER_DEAD,
788 (request_rec *) NULL);
789 pthread_mutex_lock(&worker_thread_count_mutex);
790 worker_thread_count--;
791 if (worker_thread_count == 0) {
792 /* All the threads have exited, now finish the shutdown process
793 * by signalling the sigwait thread */
794 kill(my_pid, SIGTERM);
796 pthread_mutex_unlock(&worker_thread_count_mutex);
802 static void child_main(int child_num_arg)
807 pthread_attr_t thread_attr;
809 int my_child_num = child_num_arg;
810 proc_info *my_info = NULL;
816 ap_create_pool(&pchild, pconf);
818 /*stuff to do before we switch id's, so we have permissions.*/
819 reopen_scoreboard(pchild);
821 rv = SAFE_ACCEPT(ap_child_init_lock(&process_accept_mutex, lock_fname,
823 if (rv != APR_SUCCESS) {
824 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, server_conf,
825 "Couldn't initialize cross-process lock in child");
826 clean_child_exit(APEXIT_CHILDFATAL);
829 if (unixd_setup_child()) {
830 clean_child_exit(APEXIT_CHILDFATAL);
833 ap_child_init_hook(pchild, server_conf);
835 /*done with init critical section */
837 /* All threads should mask signals out, accoring to sigwait(2) man page */
838 sigfillset(&sig_mask);
840 #ifdef SIGPROCMASK_SETS_THREAD_MASK
841 if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
842 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf, "sigprocmask");
845 if (pthread_sigmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
846 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf, "pthread_sigmask");
850 requests_this_child = ap_max_requests_per_child;
852 /* Set up the pollfd array */
853 listensocks = ap_palloc(pchild,
854 sizeof(*listensocks) * (num_listensocks + 1));
855 ap_create_tcp_socket(&listensocks[0], pchild);
856 ap_put_os_sock(&listensocks[0], &pipe_of_death[0], pchild);
857 for (lr = ap_listeners, i = 1; i <= num_listensocks; lr = lr->next, ++i)
858 listensocks[i]=lr->sd;
860 /* Setup worker threads */
862 worker_thread_count = 0;
863 pthread_mutex_init(&worker_thread_count_mutex, NULL);
864 pthread_mutex_init(&pipe_of_death_mutex, NULL);
865 pthread_attr_init(&thread_attr);
866 #ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR
870 pthread_attr_setdetachstate(&thread_attr, &on);
873 pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
875 for (i=0; i < ap_threads_per_child; i++) {
877 my_info = (proc_info *)malloc(sizeof(proc_info));
878 if (my_info == NULL) {
879 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
880 "malloc: out of memory");
881 clean_child_exit(APEXIT_CHILDFATAL);
883 my_info->pid = my_child_num;
886 ap_create_pool(&my_info->tpool, pchild);
888 /* We are creating threads right now */
889 (void) ap_update_child_status(my_child_num, i, SERVER_STARTING,
890 (request_rec *) NULL);
892 if (pthread_create(&thread, &thread_attr, worker_thread, my_info)) {
893 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
894 "pthread_create: unable to create worker thread");
895 /* In case system resources are maxxed out, we don't want
896 Apache running away with the CPU trying to fork over and
897 over and over again if we exit. */
899 clean_child_exit(APEXIT_CHILDFATAL);
902 worker_thread(my_info);
903 /* The SIGTERM shouldn't let us reach this point, but just in case... */
904 clean_child_exit(APEXIT_OK);
907 /* We let each thread update it's own scoreboard entry. This is done
908 * because it let's us deal with tid better.
912 pthread_attr_destroy(&thread_attr);
914 /* This thread will be the one responsible for handling signals */
915 sigemptyset(&sig_mask);
916 sigaddset(&sig_mask, SIGTERM);
917 sigaddset(&sig_mask, SIGINT);
918 ap_sigwait(&sig_mask, &signal_received);
919 switch (signal_received) {
922 just_die(signal_received);
925 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, server_conf,
926 "received impossible signal: %d", signal_received);
931 static int make_child(server_rec *s, int slot, time_t now)
935 if (slot + 1 > max_daemons_limit) {
936 max_daemons_limit = slot + 1;
941 ap_scoreboard_image->parent[slot].pid = getpid();
945 /* Tag this slot as occupied so that perform_idle_server_maintenance
946 * doesn't try to steal it */
947 (void) ap_update_child_status(slot, 0, SERVER_STARTING, (request_rec *) NULL);
949 if ((pid = fork()) == -1) {
950 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
952 /* fork didn't succeed. Fix the scoreboard or else
953 * it will say SERVER_STARTING forever and ever
955 (void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL);
957 /* In case system resources are maxxed out, we don't want
958 Apache running away with the CPU trying to fork over and
959 over and over again. */
966 #ifdef AIX_BIND_PROCESSOR
967 /* By default, AIX binds to a single processor. This bit unbinds
968 children which will then bind to another CPU.
970 #include <sys/processor.h>
971 int status = bindprocessor(BINDPROCESS, (int)getpid(),
972 PROCESSOR_CLASS_ANY);
974 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
975 "processor unbind failed %d", status);
978 RAISE_SIGSTOP(MAKE_CHILD);
980 ap_signal(SIGTERM, just_die);
986 ap_scoreboard_image->parent[slot].pid = pid;
990 /* start up a bunch of children */
991 static void startup_children(int number_to_start)
995 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
996 if (ap_scoreboard_image->parent[i].pid != 0) {
999 if (make_child(server_conf, i, 0) < 0) {
1008 * idle_spawn_rate is the number of children that will be spawned on the
1009 * next maintenance cycle if there aren't enough idle servers. It is
1010 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
1011 * without the need to spawn.
1013 static int idle_spawn_rate = 1;
1014 #ifndef MAX_SPAWN_RATE
1015 #define MAX_SPAWN_RATE (32)
1017 static int hold_off_on_exponential_spawning;
1019 static void perform_idle_server_maintenance(void)
1022 int idle_thread_count;
1026 int free_slots[MAX_SPAWN_RATE];
1030 /* initialize the free_list */
1033 idle_thread_count = 0;
1037 ap_sync_scoreboard_image();
1038 for (i = 0; i < ap_daemons_limit; ++i) {
1039 /* Initialization to satisfy the compiler. It doesn't know
1040 * that ap_threads_per_child is always > 0 */
1041 int status = SERVER_DEAD;
1042 int any_dying_threads = 0;
1043 int all_dead_threads = 1;
1044 int idle_thread_addition = 0;
1046 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
1048 for (j = 0; j < ap_threads_per_child; j++) {
1049 ss = &ap_scoreboard_image->servers[i][j];
1050 status = ss->status;
1052 any_dying_threads = any_dying_threads || (status == SERVER_DEAD)
1053 || (status == SERVER_GRACEFUL);
1054 all_dead_threads = all_dead_threads && (status == SERVER_DEAD);
1056 /* We consider a starting server as idle because we started it
1057 * at least a cycle ago, and if it still hasn't finished starting
1058 * then we're just going to swamp things worse by forking more.
1059 * So we hopefully won't need to fork more if we count it.
1060 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
1062 if (status <= SERVER_READY) {
1063 ++idle_thread_addition;
1066 if (all_dead_threads && free_length < idle_spawn_rate) {
1067 free_slots[free_length] = i;
1070 if (!all_dead_threads) {
1073 if (!any_dying_threads) {
1075 idle_thread_count += idle_thread_addition;
1078 max_daemons_limit = last_non_dead + 1;
1080 if (idle_thread_count > max_spare_threads) {
1081 /* Kill off one child */
1082 char char_of_death = '!';
1083 if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
1084 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "write pipe_of_death");
1086 idle_spawn_rate = 1;
1088 else if (idle_thread_count < min_spare_threads) {
1089 /* terminate the free list */
1090 if (free_length == 0) {
1091 /* only report this condition once */
1092 static int reported = 0;
1095 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
1096 "server reached MaxClients setting, consider"
1097 " raising the MaxClients setting");
1100 idle_spawn_rate = 1;
1104 if (idle_spawn_rate >= 8) {
1105 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
1106 "server seems busy, (you may need "
1107 "to increase StartServers, ThreadsPerChild "
1108 "or Min/MaxSparetThreads), "
1109 "spawning %d children, there are around %d idle "
1110 "threads, and %d total children", idle_spawn_rate,
1111 idle_thread_count, total_non_dead);
1113 for (i = 0; i < free_length; ++i) {
1114 make_child(server_conf, free_slots[i], now);
1116 /* the next time around we want to spawn twice as many if this
1117 * wasn't good enough, but not if we've just done a graceful
1119 if (hold_off_on_exponential_spawning) {
1120 --hold_off_on_exponential_spawning;
1122 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
1123 idle_spawn_rate *= 2;
1128 idle_spawn_rate = 1;
1132 static void server_main_loop(int remaining_children_to_start)
1139 while (!restart_pending && !shutdown_pending) {
1140 /* this is a memory leak, but I'll fix it later. */
1141 pid = wait_or_timeout(&status, pconf);
1144 process_child_status(pid, status);
1145 /* non-fatal death... note that it's gone in the scoreboard. */
1146 child_slot = find_child_by_pid(pid);
1147 if (child_slot >= 0) {
1148 ap_mpmt_pthread_force_reset_connection_status(child_slot);
1149 for (i = 0; i < ap_threads_per_child; i++)
1150 ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL);
1152 if (remaining_children_to_start
1153 && child_slot < ap_daemons_limit) {
1154 /* we're still doing a 1-for-1 replacement of dead
1155 * children with new children
1157 make_child(server_conf, child_slot, time(NULL));
1158 --remaining_children_to_start;
1160 #ifdef APR_HAS_OTHER_CHILD
1162 else if (ap_reap_other_child(pid, status) == 0) {
1166 else if (is_graceful) {
1167 /* Great, we've probably just lost a slot in the
1168 * scoreboard. Somehow we don't know about this
1171 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, server_conf,
1172 "long lost child came home! (pid %d)", pid);
1174 /* Don't perform idle maintenance when a child dies,
1175 * only do it when there's a timeout. Remember only a
1176 * finite number of children can die, and it's pretty
1177 * pathological for a lot to die suddenly.
1181 else if (remaining_children_to_start) {
1182 /* we hit a 1 second timeout in which none of the previous
1183 * generation of children needed to be reaped... so assume
1184 * they're all done, and pick up the slack if any is left.
1186 startup_children(remaining_children_to_start);
1187 remaining_children_to_start = 0;
1188 /* In any event we really shouldn't do the code below because
1189 * few of the servers we just started are in the IDLE state
1190 * yet, so we'd mistakenly create an extra server.
1195 perform_idle_server_maintenance();
1199 int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
1201 int remaining_children_to_start;
1206 if (pipe(pipe_of_death) == -1) {
1207 ap_log_error(APLOG_MARK, APLOG_ERR, errno,
1208 (const server_rec*) server_conf,
1209 "pipe: (pipe_of_death)");
1213 if (fcntl(pipe_of_death[0], F_SETFL, O_NONBLOCK) == -1) {
1214 ap_log_error(APLOG_MARK, APLOG_ERR, errno,
1215 (const server_rec*) server_conf,
1216 "fcntl: O_NONBLOCKing (pipe_of_death)");
1220 if ((num_listensocks = setup_listeners(server_conf)) < 1) {
1221 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1222 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1223 "no listening sockets available, shutting down");
1226 ap_log_pid(pconf, ap_pid_fname);
1228 /* Initialize cross-process accept lock */
1229 lock_fname = ap_psprintf(_pconf, "%s.%lu",
1230 ap_server_root_relative(_pconf, lock_fname),
1232 rv = ap_create_lock(&process_accept_mutex, APR_MUTEX, APR_CROSS_PROCESS,
1233 lock_fname, _pconf);
1234 if (rv != APR_SUCCESS) {
1235 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1236 "Couldn't create cross-process lock");
1242 reinit_scoreboard(pconf);
1246 /* Don't thrash... */
1247 if (max_spare_threads < min_spare_threads + ap_threads_per_child)
1248 max_spare_threads = min_spare_threads + ap_threads_per_child;
1250 /* If we're doing a graceful_restart then we're going to see a lot
1251 * of children exiting immediately when we get into the main loop
1252 * below (because we just sent them SIGWINCH). This happens pretty
1253 * rapidly... and for each one that exits we'll start a new one until
1254 * we reach at least daemons_min_free. But we may be permitted to
1255 * start more than that, so we'll just keep track of how many we're
1256 * supposed to start up without the 1 second penalty between each fork.
1258 remaining_children_to_start = ap_daemons_to_start;
1259 if (remaining_children_to_start > ap_daemons_limit) {
1260 remaining_children_to_start = ap_daemons_limit;
1263 startup_children(remaining_children_to_start);
1264 remaining_children_to_start = 0;
1267 /* give the system some time to recover before kicking into
1268 * exponential mode */
1269 hold_off_on_exponential_spawning = 10;
1272 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1273 "%s configured -- resuming normal operations",
1274 ap_get_server_version());
1275 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
1276 "Server built: %s", ap_get_server_built());
1277 restart_pending = shutdown_pending = 0;
1279 server_main_loop(remaining_children_to_start);
1281 if (shutdown_pending) {
1282 /* Time to gracefully shut down:
1283 * Kill child processes, tell them to call child_exit, etc...
1285 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1286 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGTERM");
1288 reclaim_child_processes(1); /* Start with SIGTERM */
1290 /* cleanup pid file on normal shutdown */
1292 const char *pidfile = NULL;
1293 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1294 if ( pidfile != NULL && unlink(pidfile) == 0)
1295 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1297 "removed PID file %s (pid=%ld)",
1298 pidfile, (long)getpid());
1301 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1302 "caught SIGTERM, shutting down");
1307 /* we've been told to restart */
1308 ap_signal(SIGHUP, SIG_IGN);
1311 /* not worth thinking about */
1315 /* advance to the next generation */
1316 /* XXX: we really need to make sure this new generation number isn't in
1317 * use by any of the children.
1320 ap_scoreboard_image->global.running_generation = ap_my_generation;
1321 update_scoreboard_global();
1325 char char_of_death = '!';
1327 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1328 "SIGWINCH received. Doing graceful restart");
1330 /* give the children the signal to die */
1331 for (i = 0; i < ap_daemons_limit;) {
1332 if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
1333 if (errno == EINTR) continue;
1334 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "write pipe_of_death");
1339 /* This is mostly for debugging... so that we know what is still
1340 * gracefully dealing with existing request.
1343 for (i = 0; i < ap_daemons_limit; ++i) {
1344 for (j = 0; j < ap_threads_per_child; j++) {
1345 if (ap_scoreboard_image->servers[i][j].status != SERVER_DEAD) {
1346 ap_scoreboard_image->servers[i][j].status = SERVER_GRACEFUL;
1352 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1353 * and a SIGHUP, we may as well use the same signal, because some user
1354 * pthreads are stealing signals from us left and right.
1356 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1357 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGTERM");
1359 reclaim_child_processes(1); /* Start with SIGTERM */
1360 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
1361 "SIGHUP received. Attempting to restart");
1364 ap_restart_time = time(NULL);
1369 static void mpmt_pthread_pre_config(ap_pool_t *pconf, ap_pool_t *plog, ap_pool_t *ptemp)
1371 static int restart_num = 0;
1373 one_process = !!getenv("ONE_PROCESS");
1375 /* sigh, want this only the second time around */
1376 if (restart_num++ == 1) {
1386 ap_listen_pre_config();
1387 ap_daemons_to_start = DEFAULT_START_DAEMON;
1388 min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
1389 max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
1390 ap_daemons_limit = HARD_SERVER_LIMIT;
1391 ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
1392 ap_pid_fname = DEFAULT_PIDLOG;
1393 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1394 lock_fname = DEFAULT_LOCKFILE;
1395 ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1396 ap_extended_status = 0;
1398 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1401 static void mpmt_pthread_hooks(void)
1408 static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
1410 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1415 if (cmd->server->is_virtual) {
1416 return "PidFile directive not allowed in <VirtualHost>";
1422 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
1424 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1429 ap_scoreboard_fname = arg;
1433 static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
1435 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1444 static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
1446 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1451 ap_daemons_to_start = atoi(arg);
1455 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, char *arg)
1457 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1462 min_spare_threads = atoi(arg);
1463 if (min_spare_threads <= 0) {
1464 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1465 "WARNING: detected MinSpareThreads set to non-positive.");
1466 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1467 "Resetting to 1 to avoid almost certain Apache failure.");
1468 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1469 "Please read the documentation.");
1470 min_spare_threads = 1;
1476 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, char *arg)
1478 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1483 max_spare_threads = atoi(arg);
1487 static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
1489 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1494 ap_daemons_limit = atoi(arg);
1495 if (ap_daemons_limit > HARD_SERVER_LIMIT) {
1496 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1497 "WARNING: MaxClients of %d exceeds compile time limit "
1498 "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
1499 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1500 " lowering MaxClients to %d. To increase, please "
1501 "see the", HARD_SERVER_LIMIT);
1502 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1503 " HARD_SERVER_LIMIT define in src/include/httpd.h.");
1504 ap_daemons_limit = HARD_SERVER_LIMIT;
1506 else if (ap_daemons_limit < 1) {
1507 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1\n");
1508 ap_daemons_limit = 1;
1513 static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, char *arg)
1515 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1520 ap_threads_per_child = atoi(arg);
1521 if (ap_threads_per_child > HARD_THREAD_LIMIT) {
1522 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1523 "WARNING: ThreadsPerChild of %d exceeds compile time"
1524 "limit of %d threads,", ap_threads_per_child,
1526 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1527 " lowering ThreadsPerChild to %d. To increase, please"
1528 "see the", HARD_THREAD_LIMIT);
1529 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1530 " HARD_THREAD_LIMIT define in src/include/httpd.h.");
1532 else if (ap_threads_per_child < 1) {
1533 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1534 "WARNING: Require ThreadsPerChild > 0, setting to 1");
1535 ap_threads_per_child = 1;
1540 static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
1542 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1547 ap_max_requests_per_child = atoi(arg);
1552 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
1556 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1561 fname = ap_server_root_relative(cmd->pool, arg);
1562 if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
1563 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1564 " does not exist or is not a directory", NULL);
1566 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1570 static const command_rec mpmt_pthread_cmds[] = {
1571 UNIX_DAEMON_COMMANDS
1573 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
1574 "A file for logging the server process ID"},
1575 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
1576 "A file for Apache to maintain runtime process management information"},
1577 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
1578 "The lockfile used when Apache needs to lock the accept() call"},
1579 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
1580 "Number of child processes launched at server startup" },
1581 { "MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF, TAKE1,
1582 "Minimum number of idle children, to handle request spikes" },
1583 { "MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF, TAKE1,
1584 "Maximum number of idle children" },
1585 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
1586 "Maximum number of children alive at the same time" },
1587 { "ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF, TAKE1,
1588 "Number of threads each child creates" },
1589 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
1590 "Maximum number of requests a particular child serves before dying." },
1591 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
1592 "The location of the directory Apache changes to before dumping core" },
1596 module MODULE_VAR_EXPORT mpm_mpmt_pthread_module = {
1598 mpmt_pthread_pre_config, /* run hook before the configuration is read */
1599 NULL, /* create per-directory config structure */
1600 NULL, /* merge per-directory config structures */
1601 NULL, /* create per-server config structure */
1602 NULL, /* merge per-server config structures */
1603 mpmt_pthread_cmds, /* command ap_table_t */
1604 NULL, /* handlers */
1605 mpmt_pthread_hooks /* register_hooks */