+++ /dev/null
-/* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2001 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Apache" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- * Portions of this software are based upon public domain software
- * originally written at the National Center for Supercomputing Applications,
- * University of Illinois, Urbana-Champaign.
- */
-
-#include "apr.h"
-#include "apr_portable.h"
-#include "apr_strings.h"
-#include "apr_file_io.h"
-#include "apr_thread_proc.h"
-#include "apr_signal.h"
-#define APR_WANT_STRFUNC
-#include "apr_want.h"
-
-#if APR_HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#if APR_HAVE_SYS_SOCKET_H
-#include <sys/socket.h>
-#endif
-#if APR_HAVE_SYS_WAIT_H
-#include <sys/wait.h>
-#endif
-#ifdef HAVE_SYS_PROCESSOR_H
-#include <sys/processor.h> /* for bindprocessor() */
-#endif
-
-#if !APR_HAS_THREADS
-#error The threaded MPM requires APR threads, but they are unavailable.
-#endif
-
-#define CORE_PRIVATE
-
-#include "ap_config.h"
-#include "httpd.h"
-#include "http_main.h"
-#include "http_log.h"
-#include "http_config.h" /* for read_config */
-#include "http_core.h" /* for get_remote_host */
-#include "http_connection.h"
-#include "ap_mpm.h"
-#include "unixd.h"
-#include "mpm_common.h"
-#include "ap_listen.h"
-#include "scoreboard.h"
-
-#include <signal.h>
-#include <limits.h> /* for INT_MAX */
-
-/*
- * Actual definitions of config globals
- */
-
-int ap_threads_per_child=0; /* Worker threads per child */
-static int ap_daemons_to_start=0;
-static int min_spare_threads=0;
-static int max_spare_threads=0;
-static int ap_daemons_limit=0;
-static int dying = 0;
-static int workers_may_exit = 0;
-static int requests_this_child;
-static int num_listensocks = 0;
-static apr_socket_t **listensocks;
-
-/* The structure used to pass unique initialization info to each thread */
-typedef struct {
- int pid;
- int tid;
- int sd;
- apr_pool_t *tpool; /* "pthread" would be confusing */
-} proc_info;
-
-/* Structure used to pass information to the thread responsible for
- * creating the rest of the threads.
- */
-typedef struct {
- apr_thread_t **threads;
- int child_num_arg;
- apr_threadattr_t *threadattr;
-} thread_starter;
-
-/*
- * The max child slot ever assigned, preserved across restarts. Necessary
- * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We use
- * this value to optimize routines that have to scan the entire scoreboard.
- */
-int ap_max_daemons_limit = -1;
-
-static apr_file_t *pipe_of_death_in = NULL;
-static apr_file_t *pipe_of_death_out = NULL;
-static apr_lock_t *pipe_of_death_mutex; /* insures that a child process only
- consumes one character */
-
-/* *Non*-shared http_main globals... */
-
-server_rec *ap_server_conf;
-
-/* one_process --- debugging mode variable; can be set from the command line
- * with the -X flag. If set, this gets you the child_main loop running
- * in the process which originally started up (no detach, no make_child),
- * which is a pretty nice debugging environment. (You'll get a SIGHUP
- * early in standalone_main; just continue through. This is the server
- * trying to kill off any child processes which it might have lying
- * around --- Apache doesn't keep track of their pids, it just sends
- * SIGHUP to the process group, ignoring it in the root process.
- * Continue through and you'll be fine.).
- */
-
-static int one_process = 0;
-
-#ifdef DEBUG_SIGSTOP
-int raise_sigstop_flags;
-#endif
-
-static apr_pool_t *pconf; /* Pool for config stuff */
-static apr_pool_t *pchild; /* Pool for httpd child stuff */
-
-static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main
- thread. Use this instead */
-static pid_t parent_pid;
-/* Keep track of the number of worker threads currently active */
-static int worker_thread_count;
-static apr_lock_t *worker_thread_count_mutex;
-
-/* Locks for accept serialization */
-static apr_lock_t *accept_mutex;
-
-#ifdef NO_SERIALIZED_ACCEPT
-#define SAFE_ACCEPT(stmt) APR_SUCCESS
-#else
-#define SAFE_ACCEPT(stmt) (stmt)
-#endif
-
-AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
-{
- switch(query_code){
- case AP_MPMQ_MAX_DAEMON_USED:
- *result = ap_max_daemons_limit;
- return APR_SUCCESS;
- case AP_MPMQ_IS_THREADED:
- *result = AP_MPMQ_STATIC;
- return APR_SUCCESS;
- case AP_MPMQ_IS_FORKED:
- *result = AP_MPMQ_DYNAMIC;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_DAEMONS:
- *result = HARD_SERVER_LIMIT;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_THREADS:
- *result = HARD_THREAD_LIMIT;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_THREADS:
- *result = ap_threads_per_child;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_THREADS:
- *result = min_spare_threads;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_THREADS:
- *result = max_spare_threads;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_REQUESTS_DAEMON:
- *result = ap_max_requests_per_child;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_DAEMONS:
- *result = ap_daemons_limit;
- return APR_SUCCESS;
- }
- return APR_ENOTIMPL;
-}
-
-/* a clean exit from a child with proper cleanup */
-static void clean_child_exit(int code) __attribute__ ((noreturn));
-static void clean_child_exit(int code)
-{
- if (pchild) {
- apr_pool_destroy(pchild);
- }
- exit(code);
-}
-
-/* handle all varieties of core dumping signals */
-static void sig_coredump(int sig)
-{
- chdir(ap_coredump_dir);
- apr_signal(sig, SIG_DFL);
- if (ap_my_pid == parent_pid) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
- 0, ap_server_conf,
- "seg fault or similar nasty error detected "
- "in the parent process");
-
- /* XXX we can probably add some rudimentary cleanup code here,
- * like getting rid of the pid file. If any additional bad stuff
- * happens, we are protected from recursive errors taking down the
- * system since this function is no longer the signal handler GLA
- */
- }
- kill(ap_my_pid, sig);
- /* At this point we've got sig blocked, because we're still inside
- * the signal handler. When we leave the signal handler it will
- * be unblocked, and we'll take the signal... and coredump or whatever
- * is appropriate for this particular Unix. In addition the parent
- * will see the real signal we received -- whereas if we called
- * abort() here, the parent would only see SIGABRT.
- */
-}
-
-static void just_die(int sig)
-{
- clean_child_exit(0);
-}
-
-/*****************************************************************
- * Connection structures and accounting...
- */
-
-/* volatile just in case */
-static int volatile shutdown_pending;
-static int volatile restart_pending;
-static int volatile is_graceful;
-ap_generation_t volatile ap_my_generation;
-
-/*
- * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
- * functions to initiate shutdown or restart without relying on signals.
- * Previously this was initiated in sig_term() and restart() signal handlers,
- * but we want to be able to start a shutdown/restart from other sources --
- * e.g. on Win32, from the service manager. Now the service manager can
- * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
- * these functions can also be called by the child processes, since global
- * variables are no longer used to pass on the required action to the parent.
- *
- * These should only be called from the parent process itself, since the
- * parent process will use the shutdown_pending and restart_pending variables
- * to determine whether to shutdown or restart. The child process should
- * call signal_parent() directly to tell the parent to die -- this will
- * cause neither of those variable to be set, which the parent will
- * assume means something serious is wrong (which it will be, for the
- * child to force an exit) and so do an exit anyway.
- */
-
-static void ap_start_shutdown(void)
-{
- if (shutdown_pending == 1) {
- /* Um, is this _probably_ not an error, if the user has
- * tried to do a shutdown twice quickly, so we won't
- * worry about reporting it.
- */
- return;
- }
- shutdown_pending = 1;
-}
-
-/* do a graceful restart if graceful == 1 */
-static void ap_start_restart(int graceful)
-{
-
- if (restart_pending == 1) {
- /* Probably not an error - don't bother reporting it */
- return;
- }
- restart_pending = 1;
- is_graceful = graceful;
- if (is_graceful) {
- apr_pool_cleanup_kill(pconf, NULL, ap_cleanup_scoreboard);
- }
-}
-
-static void sig_term(int sig)
-{
- ap_start_shutdown();
-}
-
-static void restart(int sig)
-{
- ap_start_restart(sig == AP_SIG_GRACEFUL);
-}
-
-static void set_signals(void)
-{
-#ifndef NO_USE_SIGACTION
- struct sigaction sa;
-
- sigemptyset(&sa.sa_mask);
- sa.sa_flags = 0;
-
- if (!one_process) {
- sa.sa_handler = sig_coredump;
-#if defined(SA_ONESHOT)
- sa.sa_flags = SA_ONESHOT;
-#elif defined(SA_RESETHAND)
- sa.sa_flags = SA_RESETHAND;
-#endif
- if (sigaction(SIGSEGV, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
-#ifdef SIGBUS
- if (sigaction(SIGBUS, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
-#endif
-#ifdef SIGABORT
- if (sigaction(SIGABORT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
-#endif
-#ifdef SIGABRT
- if (sigaction(SIGABRT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
-#endif
-#ifdef SIGILL
- if (sigaction(SIGILL, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
-#endif
- sa.sa_flags = 0;
- }
- sa.sa_handler = sig_term;
- if (sigaction(SIGTERM, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
-#ifdef SIGINT
- if (sigaction(SIGINT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
-#endif
-#ifdef SIGXCPU
- sa.sa_handler = SIG_DFL;
- if (sigaction(SIGXCPU, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
-#endif
-#ifdef SIGXFSZ
- sa.sa_handler = SIG_DFL;
- if (sigaction(SIGXFSZ, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
-#endif
-#ifdef SIGPIPE
- sa.sa_handler = SIG_IGN;
- if (sigaction(SIGPIPE, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
-#endif
-
- /* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
- * processing one */
- sigaddset(&sa.sa_mask, SIGHUP);
- sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
- sa.sa_handler = restart;
- if (sigaction(SIGHUP, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
- if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(" AP_SIG_GRACEFUL_STRING ")");
-#else
- if (!one_process) {
- apr_signal(SIGSEGV, sig_coredump);
-#ifdef SIGBUS
- apr_signal(SIGBUS, sig_coredump);
-#endif /* SIGBUS */
-#ifdef SIGABORT
- apr_signal(SIGABORT, sig_coredump);
-#endif /* SIGABORT */
-#ifdef SIGABRT
- apr_signal(SIGABRT, sig_coredump);
-#endif /* SIGABRT */
-#ifdef SIGILL
- apr_signal(SIGILL, sig_coredump);
-#endif /* SIGILL */
-#ifdef SIGXCPU
- apr_signal(SIGXCPU, SIG_DFL);
-#endif /* SIGXCPU */
-#ifdef SIGXFSZ
- apr_signal(SIGXFSZ, SIG_DFL);
-#endif /* SIGXFSZ */
- }
-
- apr_signal(SIGTERM, sig_term);
-#ifdef SIGHUP
- apr_signal(SIGHUP, restart);
-#endif /* SIGHUP */
-#ifdef AP_SIG_GRACEFUL
- apr_signal(AP_SIG_GRACEFUL, restart);
-#endif /* AP_SIG_GRACEFUL */
-#ifdef SIGPIPE
- apr_signal(SIGPIPE, SIG_IGN);
-#endif /* SIGPIPE */
-
-#endif
-}
-
-/*****************************************************************
- * Here follows a long bunch of generic server bookkeeping stuff...
- */
-
-int ap_graceful_stop_signalled(void)
- /* XXX this is really a bad confusing obsolete name
- * maybe it should be ap_mpm_process_exiting?
- */
-{
- return workers_may_exit;
-}
-
-/*****************************************************************
- * Child process main loop.
- */
-
-static void process_socket(apr_pool_t *p, apr_socket_t *sock, int my_child_num, int my_thread_num)
-{
- conn_rec *current_conn;
- long conn_id = AP_ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
- int csd;
-
- (void) apr_os_sock_get(&csd, sock);
-
- if (csd >= FD_SETSIZE) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
- "new file descriptor %d is too large; you probably need "
- "to rebuild Apache with a larger FD_SETSIZE "
- "(currently %d)",
- csd, FD_SETSIZE);
- apr_socket_close(sock);
- return;
- }
-
- current_conn = ap_run_create_connection(p, ap_server_conf, sock, conn_id);
- if (current_conn) {
- ap_process_connection(current_conn);
- ap_lingering_close(current_conn);
- }
-}
-
-/* requests_this_child has gone to zero or below. See if the admin coded
- "MaxRequestsPerChild 0", and keep going in that case. Doing it this way
- simplifies the hot path in worker_thread */
-
-static void check_infinite_requests(void)
-{
- if (ap_max_requests_per_child) {
- workers_may_exit = 1;
- }
- else {
- /* wow! if you're executing this code, you may have set a record.
- * either this child process has served over 2 billion requests, or
- * you're running a threaded 2.0 on a 16 bit machine.
- *
- * I'll buy pizza and beers at Apachecon for the first person to do
- * the former without cheating (dorking with INT_MAX, or running with
- * uncommitted performance patches, for example).
- *
- * for the latter case, you probably deserve a beer too. Greg Ames
- */
-
- requests_this_child = INT_MAX; /* keep going */
- }
-}
-
-/* Sets workers_may_exit if we received a character on the pipe_of_death */
-static void check_pipe_of_death(void)
-{
- apr_lock_acquire(pipe_of_death_mutex);
- if (!workers_may_exit) {
- apr_status_t ret;
- char pipe_read_char;
- apr_size_t n = 1;
-
- ret = apr_recv(listensocks[0], &pipe_read_char, &n);
- if (APR_STATUS_IS_EAGAIN(ret)) {
- /* It lost the lottery. It must continue to suffer
- * through a life of servitude. */
- }
- else {
- /* It won the lottery (or something else is very
- * wrong). Embrace death with open arms. */
- workers_may_exit = 1;
- }
- }
- apr_lock_release(pipe_of_death_mutex);
-}
-
-static void * worker_thread(apr_thread_t *thd, void * dummy)
-{
- proc_info * ti = dummy;
- int process_slot = ti->pid;
- int thread_slot = ti->tid;
- apr_pool_t *tpool = ti->tpool;
- apr_socket_t *csd = NULL;
- apr_pool_t *ptrans; /* Pool for per-transaction stuff */
- apr_socket_t *sd = NULL;
- int n;
- int curr_pollfd, last_pollfd = 0;
- apr_pollfd_t *pollset;
- apr_status_t rv;
-
- free(ti);
-
- apr_pool_create(&ptrans, tpool);
-
- apr_lock_acquire(worker_thread_count_mutex);
- worker_thread_count++;
- apr_lock_release(worker_thread_count_mutex);
-
- apr_poll_setup(&pollset, num_listensocks+1, tpool);
- for(n=0 ; n <= num_listensocks ; ++n)
- apr_poll_socket_add(pollset, listensocks[n], APR_POLLIN);
-
- /* TODO: Switch to a system where threads reuse the results from earlier
- poll calls - manoj */
- while (1) {
- if (requests_this_child <= 0) {
- check_infinite_requests();
- }
- if (workers_may_exit) break;
-
- (void) ap_update_child_status(process_slot, thread_slot, SERVER_READY,
- (request_rec *) NULL);
- if ((rv = SAFE_ACCEPT(apr_lock_acquire(accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_lock_acquire failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
-
- while (!workers_may_exit) {
- apr_status_t ret;
- apr_int16_t event;
-
- ret = apr_poll(pollset, &n, -1);
- if (ret != APR_SUCCESS) {
- if (APR_STATUS_IS_EINTR(ret)) {
- continue;
- }
-
- /* apr_poll() will only return errors in catastrophic
- * circumstances. Let's try exiting gracefully, for now. */
- ap_log_error(APLOG_MARK, APLOG_ERR, ret, (const server_rec *)
- ap_server_conf, "apr_poll: (listen)");
- workers_may_exit = 1;
- }
-
- if (workers_may_exit) break;
-
- apr_poll_revents_get(&event, listensocks[0], pollset);
- if (event & APR_POLLIN) {
- /* A process got a signal on the shutdown pipe. Check if we're
- * the lucky process to die. */
- check_pipe_of_death();
- continue;
- }
-
- if (num_listensocks == 1) {
- sd = ap_listeners->sd;
- goto got_fd;
- }
- else {
- /* find a listener */
- curr_pollfd = last_pollfd;
- do {
- curr_pollfd++;
- if (curr_pollfd > num_listensocks) {
- curr_pollfd = 1;
- }
- /* XXX: Should we check for POLLERR? */
- apr_poll_revents_get(&event, listensocks[curr_pollfd], pollset);
- if (event & APR_POLLIN) {
- last_pollfd = curr_pollfd;
- sd=listensocks[curr_pollfd];
- goto got_fd;
- }
- } while (curr_pollfd != last_pollfd);
- }
- }
- got_fd:
- if (!workers_may_exit) {
- if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
- csd = NULL;
- ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
- "apr_accept");
- }
- if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_lock_release failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
- if (csd != NULL) {
- process_socket(ptrans, csd, process_slot, thread_slot);
- requests_this_child--;
- }
- }
- else {
- if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex)))
- != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "apr_lock_release failed. Attempting to shutdown "
- "process gracefully.");
- workers_may_exit = 1;
- }
- break;
- }
- apr_pool_clear(ptrans);
- }
-
- apr_pool_destroy(tpool);
- ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL,
- (request_rec *) NULL);
- apr_lock_acquire(worker_thread_count_mutex);
- if (!dying) {
- /* this is the first thread to exit */
- if (ap_my_pid == ap_scoreboard_image->parent[process_slot].pid) {
- /* tell the parent that it may use this scoreboard slot */
- ap_scoreboard_image->parent[process_slot].quiescing = 1;
- }
- dying = 1;
- }
- worker_thread_count--;
- if (worker_thread_count == 0) {
- /* All the threads have exited, now finish the shutdown process
- * by signalling the sigwait thread */
- kill(ap_my_pid, SIGTERM);
- }
- apr_lock_release(worker_thread_count_mutex);
-
- return NULL;
-}
-
-static int check_signal(int signum)
-{
- switch (signum) {
- case SIGTERM:
- case SIGINT:
- return 1;
- }
- return 0;
-}
-
-static void *start_threads(apr_thread_t *thd, void * dummy)
-{
- thread_starter *ts = dummy;
- apr_thread_t **threads = ts->threads;
- apr_threadattr_t *thread_attr = ts->threadattr;
- int child_num_arg = ts->child_num_arg;
- int i;
- int my_child_num = child_num_arg;
- proc_info *my_info = NULL;
- apr_status_t rv;
- int threads_created = 0;
-
- while (!workers_may_exit) { /* give up when the process is told to terminate */
- for (i=0; i < ap_threads_per_child; i++) {
- int status = ap_scoreboard_image->servers[child_num_arg][i].status;
-
- if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
- continue;
- }
-
- my_info = (proc_info *)malloc(sizeof(proc_info));
- if (my_info == NULL) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
- "malloc: out of memory");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
- my_info->pid = my_child_num;
- my_info->tid = i;
- my_info->sd = 0;
- apr_pool_create(&my_info->tpool, pchild);
-
- /* We are creating threads right now */
- (void) ap_update_child_status(my_child_num, i, SERVER_STARTING,
- (request_rec *) NULL);
- /* We let each thread update its own scoreboard entry. This is
- * done because it lets us deal with tid better.
- */
- if ((rv = apr_thread_create(&threads[i], thread_attr, worker_thread, my_info, pchild))) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
- "apr_thread_create: unable to create worker thread");
- /* In case system resources are maxxed out, we don't want
- Apache running away with the CPU trying to fork over and
- over and over again if we exit. */
- sleep(10);
- clean_child_exit(APEXIT_CHILDFATAL);
- }
- threads_created++;
- }
- if (workers_may_exit || threads_created == ap_threads_per_child) {
- break;
- }
- sleep(1); /* wait for previous generation to clean up an entry */
- }
-
- /* What state should this child_main process be listed as in the scoreboard...?
- * ap_update_child_status(my_child_num, i, SERVER_STARTING, (request_rec *) NULL);
- *
- * This state should be listed separately in the scoreboard, in some kind
- * of process_status, not mixed in with the worker threads' status.
- * "life_status" is almost right, but it's in the worker's structure, and
- * the name could be clearer. gla
- */
- return NULL;
-}
-
-static void child_main(int child_num_arg)
-{
- apr_thread_t **threads;
- int i;
- ap_listen_rec *lr;
- apr_status_t rv;
- thread_starter *ts;
- apr_threadattr_t *thread_attr;
- apr_thread_t *start_thread_id;
-
- ap_my_pid = getpid();
- apr_pool_create(&pchild, pconf);
-
- /*stuff to do before we switch id's, so we have permissions.*/
- reopen_scoreboard(pchild);
-
- rv = SAFE_ACCEPT(apr_lock_child_init(&accept_mutex, ap_lock_fname,
- pchild));
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "Couldn't initialize cross-process lock in child");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- if (unixd_setup_child()) {
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- ap_run_child_init(pchild, ap_server_conf);
-
- /*done with init critical section */
-
- rv = apr_setup_signal_thread();
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "Couldn't initialize signal thread");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- if (ap_max_requests_per_child) {
- requests_this_child = ap_max_requests_per_child;
- }
- else {
- /* coding a value of zero means infinity */
- requests_this_child = INT_MAX;
- }
-
- /* Set up the pollfd array */
- listensocks = apr_pcalloc(pchild,
- sizeof(*listensocks) * (num_listensocks + 1));
-#if APR_FILES_AS_SOCKETS
- apr_socket_from_file(&listensocks[0], pipe_of_death_in);
-#endif
- for (lr = ap_listeners, i = 1; i <= num_listensocks; lr = lr->next, ++i)
- listensocks[i]=lr->sd;
-
- /* Setup worker threads */
-
- /* clear the storage; we may not create all our threads immediately, and we want
- * a 0 entry to indicate a thread which was not created
- */
- threads = (apr_thread_t **)calloc(1, sizeof(apr_thread_t *) * ap_threads_per_child);
- if (threads == NULL) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
- "malloc: out of memory");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
- worker_thread_count = 0;
- apr_lock_create(&worker_thread_count_mutex, APR_MUTEX, APR_INTRAPROCESS,
- NULL, pchild);
- apr_lock_create(&pipe_of_death_mutex, APR_MUTEX, APR_INTRAPROCESS,
- NULL, pchild);
-
- ts = apr_palloc(pchild, sizeof(*ts));
-
- apr_threadattr_create(&thread_attr, pchild);
- apr_threadattr_detach_set(thread_attr, 0); /* 0 means PTHREAD_CREATE_JOINABLE */
-
- ts->threads = threads;
- ts->child_num_arg = child_num_arg;
- ts->threadattr = thread_attr;
-
- if ((rv = apr_thread_create(&start_thread_id, thread_attr, start_threads, ts, pchild))) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
- "apr_thread_create: unable to create worker thread");
- /* In case system resources are maxxed out, we don't want
- Apache running away with the CPU trying to fork over and
- over and over again if we exit. */
- sleep(10);
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- apr_signal_thread(check_signal);
-
- workers_may_exit = 1; /* helps us terminate a little more quickly when
- * the dispatch of the signal thread
- * beats the Pipe of Death and the browsers
- */
-
- /* A terminating signal was received. Now join each of the workers to clean them up.
- * If the worker already exited, then the join frees their resources and returns.
- * If the worker hasn't exited, then this blocks until they have (then cleans up).
- */
- apr_thread_join(&rv, start_thread_id);
- for (i = 0; i < ap_threads_per_child; i++) {
- if (threads[i]) { /* if we ever created this thread */
- apr_thread_join(&rv, threads[i]);
- }
- }
-
- free(threads);
-
- clean_child_exit(0);
-}
-
-static int make_child(server_rec *s, int slot)
-{
- int pid;
-
- if (slot + 1 > ap_max_daemons_limit) {
- ap_max_daemons_limit = slot + 1;
- }
-
- if (one_process) {
- set_signals();
- ap_scoreboard_image->parent[slot].pid = getpid();
- child_main(slot);
- }
-
- if ((pid = fork()) == -1) {
- ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
-
- /* fork didn't succeed. Fix the scoreboard or else
- * it will say SERVER_STARTING forever and ever
- */
- (void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL);
-
- /* In case system resources are maxxed out, we don't want
- Apache running away with the CPU trying to fork over and
- over and over again. */
- sleep(10);
-
- return -1;
- }
-
- if (!pid) {
-#ifdef HAVE_BINDPROCESSOR
- /* By default, AIX binds to a single processor. This bit unbinds
- * children which will then bind to another CPU.
- */
- int status = bindprocessor(BINDPROCESS, (int)getpid(),
- PROCESSOR_CLASS_ANY);
- if (status != OK)
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno, ap_server_conf,
- "processor unbind failed %d", status);
-#endif
- RAISE_SIGSTOP(MAKE_CHILD);
-
- apr_signal(SIGTERM, just_die);
- child_main(slot);
-
- clean_child_exit(0);
- }
- /* else */
- ap_scoreboard_image->parent[slot].quiescing = 0;
- ap_scoreboard_image->parent[slot].pid = pid;
- return 0;
-}
-
-/* If there aren't many connections coming in from the network, the child
- * processes may need to be awakened from their network i/o waits.
- * The pipe of death is an effective prod.
- */
-
-static void wake_up_and_die(void)
-{
- int i;
- char char_of_death = '!';
- apr_size_t one = 1;
- apr_status_t rv;
-
- for (i = 0; i < ap_daemons_limit;) {
- if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one))
- != APR_SUCCESS) {
- if (APR_STATUS_IS_EINTR(rv)) continue;
- ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
- "write pipe_of_death");
- }
- i++;
- }
-}
-
-/* start up a bunch of children */
-static void startup_children(int number_to_start)
-{
- int i;
-
- for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
- if (ap_scoreboard_image->parent[i].pid != 0) {
- continue;
- }
- if (make_child(ap_server_conf, i) < 0) {
- break;
- }
- --number_to_start;
- }
-}
-
-
-/*
- * idle_spawn_rate is the number of children that will be spawned on the
- * next maintenance cycle if there aren't enough idle servers. It is
- * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
- * without the need to spawn.
- */
-static int idle_spawn_rate = 1;
-#ifndef MAX_SPAWN_RATE
-#define MAX_SPAWN_RATE (32)
-#endif
-static int hold_off_on_exponential_spawning;
-
-static void perform_idle_server_maintenance(void)
-{
- int i, j;
- int idle_thread_count;
- worker_score *ws;
- process_score *ps;
- int free_length;
- int totally_free_length = 0;
- int free_slots[MAX_SPAWN_RATE];
- int last_non_dead;
- int total_non_dead;
- apr_size_t one = 1;
- apr_status_t rv;
-
- /* initialize the free_list */
- free_length = 0;
-
- idle_thread_count = 0;
- last_non_dead = -1;
- total_non_dead = 0;
-
- ap_sync_scoreboard_image();
- for (i = 0; i < ap_daemons_limit; ++i) {
- /* Initialization to satisfy the compiler. It doesn't know
- * that ap_threads_per_child is always > 0 */
- int status = SERVER_DEAD;
- int any_dying_threads = 0;
- int any_dead_threads = 0;
- int all_dead_threads = 1;
-
- if (i >= ap_max_daemons_limit && totally_free_length == idle_spawn_rate)
- break;
- ps = &ap_scoreboard_image->parent[i];
- for (j = 0; j < ap_threads_per_child; j++) {
- ws = &ap_scoreboard_image->servers[i][j];
- status = ws->status;
-
- /* XXX any_dying_threads is probably no longer needed GLA */
- any_dying_threads = any_dying_threads || (status == SERVER_GRACEFUL);
- any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
- all_dead_threads = all_dead_threads &&
- (status == SERVER_DEAD ||
- status == SERVER_GRACEFUL);
-
- /* We consider a starting server as idle because we started it
- * at least a cycle ago, and if it still hasn't finished starting
- * then we're just going to swamp things worse by forking more.
- * So we hopefully won't need to fork more if we count it.
- * This depends on the ordering of SERVER_READY and SERVER_STARTING.
- */
- if (status <= SERVER_READY && status != SERVER_DEAD &&
- !ps->quiescing &&
- ps->generation == ap_my_generation &&
- /* XXX the following shouldn't be necessary if we clean up
- * properly after seg faults, but we're not yet GLA
- */
- ps->pid != 0) {
- ++idle_thread_count;
- }
- }
- if (any_dead_threads && totally_free_length < idle_spawn_rate
- && (!ps->pid /* no process in the slot */
- || ps->quiescing)) { /* or at least one is going away */
- if (all_dead_threads) {
- /* great! we prefer these, because the new process can
- * start more threads sooner. So prioritize this slot
- * by putting it ahead of any slots with active threads.
- *
- * first, make room by moving a slot that's potentially still
- * in use to the end of the array
- */
- free_slots[free_length] = free_slots[totally_free_length];
- free_slots[totally_free_length++] = i;
- }
- else {
- /* slot is still in use - back of the bus
- */
- free_slots[free_length] = i;
- }
- ++free_length;
- }
- if (!all_dead_threads) {
- last_non_dead = i;
- }
- /* XXX if (!ps->quiescing) is probably more reliable GLA */
- if (!any_dying_threads) {
- ++total_non_dead;
- }
- }
- ap_max_daemons_limit = last_non_dead + 1;
-
- if (idle_thread_count > max_spare_threads) {
- char char_of_death = '!';
- /* Kill off one child */
- if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, "write pipe_of_death");
- }
- idle_spawn_rate = 1;
- }
- else if (idle_thread_count < min_spare_threads) {
- /* terminate the free list */
- if (free_length == 0) {
- /* only report this condition once */
- static int reported = 0;
-
- if (!reported) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
- "server reached MaxClients setting, consider"
- " raising the MaxClients setting");
- reported = 1;
- }
- idle_spawn_rate = 1;
- }
- else {
- if (free_length > idle_spawn_rate) {
- free_length = idle_spawn_rate;
- }
- if (idle_spawn_rate >= 8) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
- "server seems busy, (you may need "
- "to increase StartServers, ThreadsPerChild "
- "or Min/MaxSpareThreads), "
- "spawning %d children, there are around %d idle "
- "threads, and %d total children", free_length,
- idle_thread_count, total_non_dead);
- }
- for (i = 0; i < free_length; ++i) {
- make_child(ap_server_conf, free_slots[i]);
- }
- /* the next time around we want to spawn twice as many if this
- * wasn't good enough, but not if we've just done a graceful
- */
- if (hold_off_on_exponential_spawning) {
- --hold_off_on_exponential_spawning;
- }
- else if (idle_spawn_rate < MAX_SPAWN_RATE) {
- idle_spawn_rate *= 2;
- }
- }
- }
- else {
- idle_spawn_rate = 1;
- }
-}
-
-static void server_main_loop(int remaining_children_to_start)
-{
- int child_slot;
- apr_exit_why_e exitwhy;
- int status;
- apr_proc_t pid;
- int i;
-
- while (!restart_pending && !shutdown_pending) {
- ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
-
- if (pid.pid != -1) {
- if (ap_process_child_status(&pid, exitwhy, status) != 0) {
- /* if we keep this MPM, somebody fix handling of APEXIT_CHILDFATAL */
- exit(1);
- }
-
- /* non-fatal death... note that it's gone in the scoreboard. */
- child_slot = find_child_by_pid(&pid);
- if (child_slot >= 0) {
- for (i = 0; i < ap_threads_per_child; i++)
- ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL);
-
- ap_scoreboard_image->parent[child_slot].pid = 0;
- ap_scoreboard_image->parent[child_slot].quiescing = 0;
- if (remaining_children_to_start
- && child_slot < ap_daemons_limit) {
- /* we're still doing a 1-for-1 replacement of dead
- * children with new children
- */
- make_child(ap_server_conf, child_slot);
- --remaining_children_to_start;
- }
-#if APR_HAS_OTHER_CHILD
- }
- else if (apr_proc_other_child_read(&pid, status) == 0) {
- /* handled */
-#endif
- }
- else if (is_graceful) {
- /* Great, we've probably just lost a slot in the
- * scoreboard. Somehow we don't know about this child.
- */
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
- ap_server_conf,
- "long lost child came home! (pid %ld)",
- (long)pid.pid);
- }
- /* Don't perform idle maintenance when a child dies,
- * only do it when there's a timeout. Remember only a
- * finite number of children can die, and it's pretty
- * pathological for a lot to die suddenly.
- */
- continue;
- }
- else if (remaining_children_to_start) {
- /* we hit a 1 second timeout in which none of the previous
- * generation of children needed to be reaped... so assume
- * they're all done, and pick up the slack if any is left.
- */
- startup_children(remaining_children_to_start);
- remaining_children_to_start = 0;
- /* In any event we really shouldn't do the code below because
- * few of the servers we just started are in the IDLE state
- * yet, so we'd mistakenly create an extra server.
- */
- continue;
- }
-
- perform_idle_server_maintenance();
- }
-}
-
-int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
-{
- int remaining_children_to_start;
- apr_status_t rv;
-
- pconf = _pconf;
- ap_server_conf = s;
-
- rv = apr_file_pipe_create(&pipe_of_death_in, &pipe_of_death_out, pconf);
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ERR, rv,
- (const server_rec*) ap_server_conf,
- "apr_file_pipe_create (pipe_of_death)");
- exit(1);
- }
-
- if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_ERR, rv,
- (const server_rec*) ap_server_conf,
- "apr_file_pipe_timeout_set (pipe_of_death)");
- exit(1);
- }
-
- if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
- /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
- "no listening sockets available, shutting down");
- return 1;
- }
- ap_log_pid(pconf, ap_pid_fname);
-
- /* Initialize cross-process accept lock */
- ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_OS_PROC_T_FMT,
- ap_server_root_relative(_pconf, ap_lock_fname),
- ap_my_pid);
- rv = apr_lock_create_np(&accept_mutex, APR_MUTEX, APR_LOCKALL,
- ap_accept_lock_mech, ap_lock_fname, _pconf);
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
- "Couldn't create accept lock");
- return 1;
- }
-
-#if APR_USE_SYSVSEM_SERIALIZE
- if (ap_accept_lock_mech == APR_LOCK_DEFAULT ||
- ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
-#else
- if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
-#endif
- rv = unixd_set_lock_perms(accept_mutex);
- if (rv != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
- "Couldn't set permissions on cross-process lock");
- return 1;
- }
- }
-
- if (!is_graceful) {
- ap_run_pre_mpm(pconf, SB_SHARED);
- }
-
- set_signals();
- /* Don't thrash... */
- if (max_spare_threads < min_spare_threads + ap_threads_per_child)
- max_spare_threads = min_spare_threads + ap_threads_per_child;
-
- /* If we're doing a graceful_restart then we're going to see a lot
- * of children exiting immediately when we get into the main loop
- * below (because we just sent them AP_SIG_GRACEFUL). This happens
- * pretty rapidly... and for each one that exits we'll start a new one
- * until we reach at least daemons_min_free. But we may be permitted to
- * start more than that, so we'll just keep track of how many we're
- * supposed to start up without the 1 second penalty between each fork.
- */
- remaining_children_to_start = ap_daemons_to_start;
- if (remaining_children_to_start > ap_daemons_limit) {
- remaining_children_to_start = ap_daemons_limit;
- }
- if (!is_graceful) {
- startup_children(remaining_children_to_start);
- remaining_children_to_start = 0;
- }
- else {
- /* give the system some time to recover before kicking into
- * exponential mode */
- hold_off_on_exponential_spawning = 10;
- }
-
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "%s configured -- resuming normal operations",
- ap_get_server_version());
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
- "Server built: %s", ap_get_server_built());
- restart_pending = shutdown_pending = 0;
-
- server_main_loop(remaining_children_to_start);
-
- if (shutdown_pending) {
- /* Time to gracefully shut down:
- * Kill child processes, tell them to call child_exit, etc...
- */
- wake_up_and_die();
-
- if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
- }
- ap_reclaim_child_processes(1); /* Start with SIGTERM */
-
- /* cleanup pid file on normal shutdown */
- {
- const char *pidfile = NULL;
- pidfile = ap_server_root_relative (pconf, ap_pid_fname);
- if ( pidfile != NULL && unlink(pidfile) == 0)
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
- ap_server_conf,
- "removed PID file %s (pid=%ld)",
- pidfile, (long)getpid());
- }
-
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "caught SIGTERM, shutting down");
-
- return 1;
- }
-
- /* we've been told to restart */
- apr_signal(SIGHUP, SIG_IGN);
-
- if (one_process) {
- /* not worth thinking about */
- return 1;
- }
-
- /* advance to the next generation */
- /* XXX: we really need to make sure this new generation number isn't in
- * use by any of the children.
- */
- ++ap_my_generation;
- ap_scoreboard_image->global.running_generation = ap_my_generation;
- update_scoreboard_global();
-
- /* wake up the children...time to die. But we'll have more soon */
- wake_up_and_die();
-
- if (is_graceful) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- AP_SIG_GRACEFUL_STRING " received. Doing graceful restart");
-
- /* This is mostly for debugging... so that we know what is still
- * gracefully dealing with existing request.
- */
-
- }
- else {
- /* Kill 'em all. Since the child acts the same on the parents SIGTERM
- * and a SIGHUP, we may as well use the same signal, because some user
- * pthreads are stealing signals from us left and right.
- */
- if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
- }
- ap_reclaim_child_processes(1); /* Start with SIGTERM */
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "SIGHUP received. Attempting to restart");
- }
- return 0;
-}
-
-static void threaded_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
-{
- static int restart_num = 0;
- int no_detach, debug;
- ap_directive_t *pdir;
- ap_directive_t *max_clients = NULL;
-
- /* make sure that "ThreadsPerChild" gets set before "MaxClients" */
- for (pdir = ap_conftree; pdir != NULL; pdir = pdir->next) {
- if (strncasecmp(pdir->directive, "ThreadsPerChild", 15) == 0) {
- if (!max_clients) {
- break; /* we're in the clear, got ThreadsPerChild first */
- }
- else {
- /* now to swap the data */
- ap_directive_t temp;
-
- temp.directive = pdir->directive;
- temp.args = pdir->args;
- /* Make sure you don't change 'next', or you may get loops! */
- /* XXX: first_child, parent, and data can never be set
- * for these directives, right? -aaron */
- temp.filename = pdir->filename;
- temp.line_num = pdir->line_num;
-
- pdir->directive = max_clients->directive;
- pdir->args = max_clients->args;
- pdir->filename = max_clients->filename;
- pdir->line_num = max_clients->line_num;
-
- max_clients->directive = temp.directive;
- max_clients->args = temp.args;
- max_clients->filename = temp.filename;
- max_clients->line_num = temp.line_num;
- break;
- }
- }
- else if (!max_clients
- && strncasecmp(pdir->directive, "MaxClients", 10) == 0) {
- max_clients = pdir;
- }
- }
-
- debug = ap_exists_config_define("DEBUG");
-
- if (debug)
- no_detach = one_process = 1;
- else
- {
- no_detach = ap_exists_config_define("NO_DETACH");
- one_process = ap_exists_config_define("ONE_PROCESS");
- }
-
- /* sigh, want this only the second time around */
- if (restart_num++ == 1) {
- is_graceful = 0;
-
- if (!one_process && !no_detach) {
- apr_proc_detach();
- }
- parent_pid = ap_my_pid = getpid();
- }
-
- unixd_pre_config(ptemp);
- ap_listen_pre_config();
- ap_daemons_to_start = DEFAULT_START_DAEMON;
- min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
- max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
- ap_daemons_limit = HARD_SERVER_LIMIT;
- ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
- ap_pid_fname = DEFAULT_PIDLOG;
- ap_scoreboard_fname = DEFAULT_SCOREBOARD;
- ap_lock_fname = DEFAULT_LOCKFILE;
- ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
- ap_extended_status = 0;
-
- apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
-}
-
-static void threaded_hooks(apr_pool_t *p)
-{
- one_process = 0;
-
- ap_hook_pre_config(threaded_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
-}
-
-static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
- const char *arg)
-{
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- ap_daemons_to_start = atoi(arg);
- return NULL;
-}
-
-static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy,
- const char *arg)
-{
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- min_spare_threads = atoi(arg);
- if (min_spare_threads <= 0) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: detected MinSpareThreads set to non-positive.");
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "Resetting to 1 to avoid almost certain Apache failure.");
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "Please read the documentation.");
- min_spare_threads = 1;
- }
-
- return NULL;
-}
-
-static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
- const char *arg)
-{
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- max_spare_threads = atoi(arg);
- return NULL;
-}
-
-static const char *set_server_limit (cmd_parms *cmd, void *dummy,
- const char *arg)
-{
- int max_clients;
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- /* It is ok to use ap_threads_per_child here because we are
- * sure that it gets set before MaxClients in the pre_config stage. */
- max_clients = atoi(arg);
- if (max_clients < ap_threads_per_child) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: MaxClients (%d) must be at least as large",
- max_clients);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " large as ThreadsPerChild (%d). Automatically",
- ap_threads_per_child);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " increasing MaxClients to %d.",
- ap_threads_per_child);
- max_clients = ap_threads_per_child;
- }
- ap_daemons_limit = max_clients / ap_threads_per_child;
- if ((max_clients > 0) && (max_clients % ap_threads_per_child)) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: MaxClients (%d) is not an integer multiple",
- max_clients);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " of ThreadsPerChild (%d), lowering MaxClients to %d",
- ap_threads_per_child,
- ap_daemons_limit * ap_threads_per_child);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " for a maximum of %d child processes,",
- ap_daemons_limit);
- max_clients = ap_daemons_limit * ap_threads_per_child;
- }
- if (ap_daemons_limit > HARD_SERVER_LIMIT) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: MaxClients of %d would require %d servers,",
- max_clients, ap_daemons_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " and would exceed the compile time limit of %d.",
- HARD_SERVER_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " Automatically lowering MaxClients to %d. To increase,",
- HARD_SERVER_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " please see the HARD_SERVER_LIMIT define in %s.",
- AP_MPM_HARD_LIMITS_FILE);
- ap_daemons_limit = HARD_SERVER_LIMIT;
- }
- else if (ap_daemons_limit < 1) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1");
- ap_daemons_limit = 1;
- }
- return NULL;
-}
-
-static const char *set_threads_per_child (cmd_parms *cmd, void *dummy,
- const char *arg)
-{
- const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
- if (err != NULL) {
- return err;
- }
-
- ap_threads_per_child = atoi(arg);
- if (ap_threads_per_child > HARD_THREAD_LIMIT) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: ThreadsPerChild of %d exceeds compile time "
- "limit of %d threads,", ap_threads_per_child,
- HARD_THREAD_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " lowering ThreadsPerChild to %d. To increase, please"
- " see the", HARD_THREAD_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " HARD_THREAD_LIMIT define in %s.",
- AP_MPM_HARD_LIMITS_FILE);
- ap_threads_per_child = HARD_THREAD_LIMIT;
- }
- else if (ap_threads_per_child < 1) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- "WARNING: Require ThreadsPerChild > 0, setting to 1");
- ap_threads_per_child = 1;
- }
- return NULL;
-}
-
-static const command_rec threaded_cmds[] = {
-UNIX_DAEMON_COMMANDS,
-LISTEN_COMMANDS,
-AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
- "Number of child processes launched at server startup"),
-AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
- "Minimum number of idle children, to handle request spikes"),
-AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
- "Maximum number of idle children"),
-AP_INIT_TAKE1("MaxClients", set_server_limit, NULL, RSRC_CONF,
- "Maximum number of children alive at the same time"),
-AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
- "Number of threads each child creates"),
-{ NULL }
-};
-
-module AP_MODULE_DECLARE_DATA mpm_threaded_module = {
- MPM20_MODULE_STUFF,
- NULL, /* hook to run before apache parses args */
- NULL, /* create per-directory config structure */
- NULL, /* merge per-directory config structures */
- NULL, /* create per-server config structure */
- NULL, /* merge per-server config structures */
- threaded_cmds, /* command apr_table_t */
- threaded_hooks /* register_hooks */
-};
-
projects / apache / commitdiff