--- /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 Worker 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 "fdqueue.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_max_requests_per_child=0;
+static const char *ap_pid_fname=NULL;
+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;
+static FDQueue *worker_queue;
+
+/* 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 SIGWINCH restarts. We use this
+ * value to optimize routines that have to scan the entire scoreboard.
+ */
+int ap_max_daemons_limit = -1;
+
+char ap_coredump_dir[MAX_STRING_LEN];
+
+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 */
+/* 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;
+static apr_lockmech_e_np accept_lock_mech = APR_LOCK_DEFAULT;
+static const char *lock_fname;
+
+#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_DEAMONS:
+ *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_DEAMON:
+ *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);
+ 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 == SIGWINCH);
+}
+
+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 WINCH while we're busy processing one */
+ sigaddset(&sa.sa_mask, SIGHUP);
+ sigaddset(&sa.sa_mask, SIGWINCH);
+ 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(SIGWINCH, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
+#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 SIGWINCH
+ apr_signal(SIGWINCH, restart);
+#endif /* SIGWINCH */
+#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 - Does this really work? - Manoj */
+ return is_graceful;
+}
+
+/*****************************************************************
+ * 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;
+ }
+
+ ap_sock_disable_nagle(sock);
+
+ current_conn = ap_new_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 *listener_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);
+
+ worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
+ ap_queue_init(worker_queue, ap_threads_per_child, pchild);
+
+ /* 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;
+
+ 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) {
+ ap_queue_push(worker_queue, csd, ptrans);
+ ap_block_on_queue(worker_queue);
+ }
+ }
+ 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_destroy(tpool);
+ ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL,
+ (request_rec *) NULL);
+ dying = 1;
+ apr_lock_acquire(worker_thread_count_mutex);
+ 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 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);
+
+ while (!workers_may_exit) {
+ ap_queue_pop(worker_queue, &csd, &ptrans, 1);
+ process_socket(ptrans, csd, process_slot, thread_slot);
+ requests_this_child--;
+ 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;
+ apr_thread_t *listener;
+
+ while (1) {
+ my_info = (proc_info *)malloc(sizeof(proc_info));
+ my_info->pid = my_child_num;
+ my_info->tid = i;
+ my_info->sd = 0;
+ apr_pool_create(&my_info->tpool, pchild);
+ apr_thread_create(&listener, thread_attr, listener_thread, my_info, pchild);
+ 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, 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 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;
+
+ if (i >= ap_max_daemons_limit && 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;
+
+ any_dying_threads = any_dying_threads || (status == SERVER_GRACEFUL);
+ any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
+
+ /* 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->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;
+ }
+ }
+ /* XXX any_dead_threads may not be needed any more GLA */
+ if (any_dead_threads && free_length < idle_spawn_rate
+ && (!ps->pid /* no process in the slot */
+ || ps->quiescing)) { /* or at least one is going away */
+ free_slots[free_length] = i;
+ ++free_length;
+ }
+ if (!any_dying_threads) {
+ last_non_dead = i;
+ ++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 (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_wait_t status;
+ apr_proc_t pid;
+ int i;
+
+ while (!restart_pending && !shutdown_pending) {
+ ap_wait_or_timeout(&status, &pid, pconf);
+
+ if (pid.pid != -1) {
+ ap_process_child_status(&pid, status);
+ /* 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 */
+ lock_fname = apr_psprintf(_pconf, "%s.%" APR_OS_PROC_T_FMT,
+ ap_server_root_relative(_pconf, lock_fname),
+ ap_my_pid);
+ rv = apr_lock_create_np(&accept_mutex, APR_MUTEX, APR_LOCKALL,
+ accept_lock_mech, lock_fname, _pconf);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
+ "Couldn't create accept 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 SIGWINCH). 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,
+ "SIGWINCH 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 worker_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+ static int restart_num = 0;
+ int no_detach = 0;
+
+ one_process = !!ap_exists_config_define("ONE_PROCESS");
+ no_detach = !!ap_exists_config_define("NO_DETACH");
+
+ /* sigh, want this only the second time around */
+ if (restart_num++ == 1) {
+ is_graceful = 0;
+
+ if (!one_process && !no_detach) {
+ apr_proc_detach();
+ }
+ 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;
+ 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 worker_hooks(apr_pool_t *p)
+{
+ one_process = 0;
+
+ ap_hook_pre_config(worker_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+
+static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ if (cmd->server->is_virtual) {
+ return "PidFile directive not allowed in <VirtualHost>";
+ }
+ ap_pid_fname = arg;
+ return NULL;
+}
+
+static const char *set_scoreboard(cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_scoreboard_fname = arg;
+ return NULL;
+}
+
+static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ lock_fname = arg;
+ return NULL;
+}
+
+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)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_daemons_limit = atoi(arg);
+ if (ap_daemons_limit > HARD_SERVER_LIMIT) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
+ "WARNING: MaxClients of %d exceeds compile time limit "
+ "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
+ ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
+ " lowering MaxClients to %d. To increase, please "
+ "see the", HARD_SERVER_LIMIT);
+ ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
+ " 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 char *set_max_requests(cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_max_requests_per_child = atoi(arg);
+
+ return NULL;
+}
+
+static const char *set_coredumpdir (cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ apr_finfo_t finfo;
+ const char *fname;
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ fname = ap_server_root_relative(cmd->pool, arg);
+ if ((apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS)
+ || (finfo.filetype != APR_DIR)) {
+ return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
+ " does not exist or is not a directory", NULL);
+ }
+ apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
+ return NULL;
+}
+
+static const char *set_accept_lock_mech(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ if (!strcasecmp(arg, "default")) {
+ accept_lock_mech = APR_LOCK_DEFAULT;
+ }
+#if APR_HAS_FLOCK_SERIALIZE
+ else if (!strcasecmp(arg, "flock")) {
+ accept_lock_mech = APR_LOCK_FLOCK;
+ }
+#endif
+#if APR_HAS_FCNTL_SERIALIZE
+ else if (!strcasecmp(arg, "fcntl")) {
+ accept_lock_mech = APR_LOCK_FCNTL;
+ }
+#endif
+#if APR_HAS_SYSVSEM_SERIALIZE
+ else if (!strcasecmp(arg, "sysvsem")) {
+ accept_lock_mech = APR_LOCK_SYSVSEM;
+ }
+#endif
+#if APR_HAS_PROC_PTHREAD_SERIALIZE
+ else if (!strcasecmp(arg, "proc_pthread")) {
+ accept_lock_mech = APR_LOCK_PROC_PTHREAD;
+ }
+#endif
+ else {
+ return apr_pstrcat(cmd->pool, arg, " is an invalid mutex mechanism; valid "
+ "ones for this platform are: default"
+#if APR_HAS_FLOCK_SERIALIZE
+ ", flock"
+#endif
+#if APR_HAS_FCNTL_SERIALIZE
+ ", fcntl"
+#endif
+#if APR_HAS_SYSVSEM_SERIALIZE
+ ", sysvsem"
+#endif
+#if APR_HAS_PROC_PTHREAD_SERIALIZE
+ ", proc_pthread"
+#endif
+ , NULL);
+ }
+ return NULL;
+}
+
+static const command_rec worker_cmds[] = {
+UNIX_DAEMON_COMMANDS
+LISTEN_COMMANDS
+AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
+ "A file for logging the server process ID"),
+AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
+ "A file for Apache to maintain runtime process management information"),
+AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
+ "The lockfile used when Apache needs to lock the accept() call"),
+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"),
+AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
+ "Maximum number of requests a particular child serves before dying."),
+AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
+ "The location of the directory Apache changes to before dumping core"),
+AP_INIT_TAKE1("AcceptMutex", set_accept_lock_mech, NULL, RSRC_CONF,
+ "The system mutex implementation to use for the accept mutex"),
+{ NULL }
+};
+
+module AP_MODULE_DECLARE_DATA mpm_worker_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 */
+ worker_cmds, /* command apr_table_t */
+ worker_hooks /* register_hooks */
+};
+
projects / apache / commitdiff