diff options
Diffstat (limited to 'server/mpm/worker/worker.c')
| -rw-r--r-- | server/mpm/worker/worker.c | 1903 |
1 files changed, 0 insertions, 1903 deletions
diff --git a/server/mpm/worker/worker.c b/server/mpm/worker/worker.c deleted file mode 100644 index d199c91db4..0000000000 --- a/server/mpm/worker/worker.c +++ /dev/null @@ -1,1903 +0,0 @@ -/* ==================================================================== - * The Apache Software License, Version 1.1 - * - * Copyright (c) 2000-2002 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. - */ - -/* The purpose of this MPM is to fix the design flaws in the threaded - * model. Because of the way that pthreads and mutex locks interact, - * it is basically impossible to cleanly gracefully shutdown a child - * process if multiple threads are all blocked in accept. This model - * fixes those problems. - */ - -#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" -#include "apr_thread_mutex.h" -#include "apr_proc_mutex.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 "pod.h" -#include "mpm_common.h" -#include "ap_listen.h" -#include "scoreboard.h" -#include "fdqueue.h" -#include "mpm_default.h" - -#include <signal.h> -#include <limits.h> /* for INT_MAX */ - -/* Limit on the total --- clients will be locked out if more servers than - * this are needed. It is intended solely to keep the server from crashing - * when things get out of hand. - * - * We keep a hard maximum number of servers, for two reasons --- first off, - * in case something goes seriously wrong, we want to stop the fork bomb - * short of actually crashing the machine we're running on by filling some - * kernel table. Secondly, it keeps the size of the scoreboard file small - * enough that we can read the whole thing without worrying too much about - * the overhead. - */ -#ifndef DEFAULT_SERVER_LIMIT -#define DEFAULT_SERVER_LIMIT 16 -#endif - -/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want - * some sort of compile-time limit to help catch typos. - */ -#ifndef MAX_SERVER_LIMIT -#define MAX_SERVER_LIMIT 20000 -#endif - -/* Limit on the threads per process. Clients will be locked out if more than - * this * server_limit are needed. - * - * We keep this for one reason it keeps the size of the scoreboard file small - * enough that we can read the whole thing without worrying too much about - * the overhead. - */ -#ifndef DEFAULT_THREAD_LIMIT -#define DEFAULT_THREAD_LIMIT 64 -#endif - -/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT. We want - * some sort of compile-time limit to help catch typos. - */ -#ifndef MAX_THREAD_LIMIT -#define MAX_THREAD_LIMIT 20000 -#endif - -/* - * 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 server_limit = DEFAULT_SERVER_LIMIT; -static int first_server_limit; -static int thread_limit = DEFAULT_THREAD_LIMIT; -static int first_thread_limit; -static int changed_limit_at_restart; -static int dying = 0; -static int workers_may_exit = 0; -static int requests_this_child; -static int num_listensocks = 0; -static int resource_shortage = 0; -static fd_queue_t *worker_queue; - -/* The structure used to pass unique initialization info to each thread */ -typedef struct { - int pid; - int tid; - int sd; -} 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; - -#define ID_FROM_CHILD_THREAD(c, t) ((c * thread_limit) + t) - -/* - * 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 ap_pod_t *pod; - -/* *Non*-shared http_main globals... */ - -server_rec *ap_server_conf; - -/* The worker MPM respects a couple of runtime flags that can aid - * in debugging. Setting the -DNO_DETACH flag will prevent the root process - * from detaching from its controlling terminal. Additionally, setting - * the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the - * child_main loop running in the process which originally started up. - * This gives you 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_thread_mutex_t *worker_thread_count_mutex; - -/* Locks for accept serialization */ -static apr_proc_mutex_t *accept_mutex; - -#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT -#define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS) -#else -#define SAFE_ACCEPT(stmt) (stmt) -#endif - -static void signal_workers(void) -{ - workers_may_exit = 1; - /* XXX: This will happen naturally on a graceful, and we don't care - * otherwise. - ap_queue_signal_all_wakeup(worker_queue); */ - ap_queue_interrupt_all(worker_queue); -} - -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 = server_limit; - return APR_SUCCESS; - case AP_MPMQ_HARD_LIMIT_THREADS: - *result = 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) -{ - apr_filepath_set(ap_coredump_dir, pconf); - 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; -static volatile int child_fatal; -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 = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num); - int csd; - ap_sb_handle_t *sbh; - - ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num); - 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, sbh); - if (current_conn) { - ap_process_connection(current_conn, sock); - 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) { - signal_workers(); - } - 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 */ - } -} - -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 = apr_thread_pool_get(thd); - void *csd = NULL; - apr_pool_t *ptrans; /* Pool for per-transaction stuff */ - apr_pool_t *recycled_pool = NULL; - int n; - apr_pollfd_t *pollset; - apr_status_t rv; - ap_listen_rec *lr, *last_lr = ap_listeners; - - free(ti); - - apr_thread_mutex_lock(worker_thread_count_mutex); - worker_thread_count++; - apr_thread_mutex_unlock(worker_thread_count_mutex); - - apr_poll_setup(&pollset, num_listensocks, tpool); - for(lr = ap_listeners ; lr != NULL ; lr = lr->next) - apr_poll_socket_add(pollset, lr->sd, APR_POLLIN); - - /* TODO: Switch to a system where threads reuse the results from earlier - poll calls - manoj */ - while (1) { - /* TODO: requests_this_child should be synchronized - aaron */ - if (requests_this_child <= 0) { - check_infinite_requests(); - } - if (workers_may_exit) break; - - if ((rv = SAFE_ACCEPT(apr_proc_mutex_lock(accept_mutex))) - != APR_SUCCESS) { - int level = APLOG_EMERG; - - if (ap_scoreboard_image->parent[process_slot].generation != - ap_scoreboard_image->global->running_generation) { - level = APLOG_DEBUG; /* common to get these at restart time */ - } - ap_log_error(APLOG_MARK, level, rv, ap_server_conf, - "apr_proc_mutex_lock failed. Attempting to shutdown " - "process gracefully."); - signal_workers(); - break; /* skip the lock release */ - } - - if (!ap_listeners->next) { - /* Only one listener, so skip the poll */ - lr = ap_listeners; - } - else { - 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)"); - signal_workers(); - } - - if (workers_may_exit) break; - - /* find a listener */ - lr = last_lr; - do { - lr = lr->next; - if (lr == NULL) { - lr = ap_listeners; - } - /* XXX: Should we check for POLLERR? */ - apr_poll_revents_get(&event, lr->sd, pollset); - if (event & APR_POLLIN) { - last_lr = lr; - goto got_fd; - } - } while (lr != last_lr); - } - } - got_fd: - if (!workers_may_exit) { - /* create a new transaction pool for each accepted socket */ - if (recycled_pool == NULL) { - apr_allocator_t *allocator; - - apr_allocator_create(&allocator); - apr_pool_create_ex(&ptrans, NULL, NULL, allocator); - apr_allocator_set_owner(allocator, ptrans); - } - else { - ptrans = recycled_pool; - } - apr_pool_tag(ptrans, "transaction"); - rv = lr->accept_func(&csd, lr, ptrans); - - /* If we were interrupted for whatever reason, just start - * the main loop over again. (The worker MPM still uses - * signals in the one_process case.) */ - if (APR_STATUS_IS_EINTR(rv)) { - continue; - } - if (rv == APR_EGENERAL) { - /* E[NM]FILE, ENOMEM, etc */ - resource_shortage = 1; - signal_workers(); - } - if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(accept_mutex))) - != APR_SUCCESS) { - int level = APLOG_EMERG; - - if (ap_scoreboard_image->parent[process_slot].generation != - ap_scoreboard_image->global->running_generation) { - level = APLOG_DEBUG; /* common to get these at restart time */ - } - ap_log_error(APLOG_MARK, level, rv, ap_server_conf, - "apr_proc_mutex_unlock failed. Attempting to " - "shutdown process gracefully."); - signal_workers(); - } - if (csd != NULL) { - rv = ap_queue_push(worker_queue, csd, ptrans, - &recycled_pool); - if (rv) { - /* trash the connection; we couldn't queue the connected - * socket to a worker - */ - apr_socket_close(csd); - ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, - "ap_queue_push failed"); - } - } - } - else { - if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(accept_mutex))) - != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, - "apr_proc_mutex_unlock failed. Attempting to " - "shutdown process gracefully."); - signal_workers(); - } - break; - } - } - - ap_update_child_status_from_indexes(process_slot, thread_slot, - (dying) ? SERVER_DEAD : SERVER_GRACEFUL, - (request_rec *) NULL); - dying = 1; - ap_scoreboard_image->parent[process_slot].quiescing = 1; - kill(ap_my_pid, SIGTERM); - - apr_thread_exit(thd, APR_SUCCESS); - return NULL; -} - -static void * APR_THREAD_FUNC worker_thread(apr_thread_t *thd, void * dummy) -{ - proc_info * ti = dummy; - int process_slot = ti->pid; - int thread_slot = ti->tid; - apr_socket_t *csd = NULL; - apr_pool_t *last_ptrans = NULL; - apr_pool_t *ptrans; /* Pool for per-transaction stuff */ - apr_status_t rv; - - free(ti); - - ap_update_child_status_from_indexes(process_slot, thread_slot, SERVER_STARTING, NULL); - while (!workers_may_exit) { - ap_update_child_status_from_indexes(process_slot, thread_slot, SERVER_READY, NULL); - rv = ap_queue_pop(worker_queue, &csd, &ptrans, last_ptrans); - last_ptrans = NULL; - - /* We get APR_EINTR whenever ap_queue_pop() has been interrupted - * from an explicit call to ap_queue_interrupt_all(). This allows - * us to unblock threads stuck in ap_queue_pop() when a shutdown - * is pending. */ - if (rv == APR_EINTR || !csd) { - continue; - } - process_socket(ptrans, csd, process_slot, thread_slot); - requests_this_child--; /* FIXME: should be synchronized - aaron */ - apr_pool_clear(ptrans); - last_ptrans = ptrans; - } - - ap_update_child_status_from_indexes(process_slot, thread_slot, - (dying) ? SERVER_DEAD : SERVER_GRACEFUL, (request_rec *) NULL); - apr_thread_mutex_lock(worker_thread_count_mutex); - worker_thread_count--; - apr_thread_mutex_unlock(worker_thread_count_mutex); - - apr_thread_exit(thd, APR_SUCCESS); - return NULL; -} - -static int check_signal(int signum) -{ - switch (signum) { - case SIGTERM: - case SIGINT: - return 1; - } - return 0; -} - -static void * APR_THREAD_FUNC 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 my_child_num = child_num_arg; - proc_info *my_info = NULL; - apr_status_t rv; - int i = 0; - int threads_created = 0; - apr_thread_t *listener; - - /* We must create the fd queues before we start up the listener - * and worker threads. */ - worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue)); - rv = ap_queue_init(worker_queue, ap_threads_per_child, pchild); - if (rv != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, - "ap_queue_init() failed"); - clean_child_exit(APEXIT_CHILDFATAL); - } - - my_info = (proc_info *)malloc(sizeof(proc_info)); - my_info->pid = my_child_num; - my_info->tid = i; - my_info->sd = 0; - rv = apr_thread_create(&listener, thread_attr, listener_thread, - my_info, pchild); - if (rv != APR_SUCCESS) { - 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. - * XXX Jeff doesn't see how Apache is going to try to fork again since - * the exit code is APEXIT_CHILDFATAL - */ - apr_sleep(10 * APR_USEC_PER_SEC); - clean_child_exit(APEXIT_CHILDFATAL); - } - while (1) { - /* ap_threads_per_child does not include the listener thread */ - 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; - - /* We are creating threads right now */ - ap_update_child_status_from_indexes(my_child_num, i, - SERVER_STARTING, NULL); - /* We let each thread update its own scoreboard entry. This is - * done because it lets us deal with tid better. - */ - rv = apr_thread_create(&threads[i], thread_attr, - worker_thread, my_info, pchild); - if (rv != APR_SUCCESS) { - 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. */ - apr_sleep(10 * APR_USEC_PER_SEC); - clean_child_exit(APEXIT_CHILDFATAL); - } - threads_created++; - } - if (workers_may_exit || threads_created == ap_threads_per_child) { - break; - } - /* wait for previous generation to clean up an entry */ - apr_sleep(1 * APR_USEC_PER_SEC); - } - - /* What state should this child_main process be listed as in the - * scoreboard...? - * ap_update_child_status_from_indexes(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 - */ - apr_thread_exit(thd, APR_SUCCESS); - return NULL; -} - -static void join_workers(apr_thread_t **threads) -{ - int i; - apr_status_t rv, thread_rv; - - for (i = 0; i < ap_threads_per_child; i++) { - if (threads[i]) { /* if we ever created this thread */ - rv = apr_thread_join(&thread_rv, threads[i]); - if (rv != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, - "apr_thread_join: unable to join worker " - "thread %d", - i); - } - } - } -} - -static void join_start_thread(apr_thread_t *start_thread_id) -{ - apr_status_t rv, thread_rv; - - rv = apr_thread_join(&thread_rv, start_thread_id); - if (rv != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, - "apr_thread_join: unable to join the start " - "thread"); - } -} - -static void child_main(int child_num_arg) -{ - apr_thread_t **threads; - 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.*/ - ap_reopen_scoreboard(pchild, NULL, 0); - - rv = SAFE_ACCEPT(apr_proc_mutex_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 */ - - /* Just use the standard apr_setup_signal_thread to block all signals - * from being received. The child processes no longer use signals for - * any communication with the parent process. - */ - 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; - } - - /* 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_thread_mutex_create(&worker_thread_count_mutex, - APR_THREAD_MUTEX_DEFAULT, pchild); - - ts = (thread_starter *)apr_palloc(pchild, sizeof(*ts)); - - apr_threadattr_create(&thread_attr, pchild); - /* 0 means PTHREAD_CREATE_JOINABLE */ - apr_threadattr_detach_set(thread_attr, 0); - - ts->threads = threads; - ts->child_num_arg = child_num_arg; - ts->threadattr = thread_attr; - - rv = apr_thread_create(&start_thread_id, thread_attr, start_threads, - ts, pchild); - if (rv != APR_SUCCESS) { - 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. */ - apr_sleep(10 * APR_USEC_PER_SEC); - clean_child_exit(APEXIT_CHILDFATAL); - } - - /* If we are only running in one_process mode, we will want to - * still handle signals. */ - if (one_process) { - /* Set up a signal handler for this thread. */ - apr_signal_thread(check_signal); - /* make sure the start thread has finished; signal_workers() - * and join_workers() depend on that - */ - join_start_thread(start_thread_id); - signal_workers(); /* 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). - */ - join_workers(threads); - } - else { /* !one_process */ - /* Watch for any messages from the parent over the POD */ - while (1) { - rv = ap_mpm_pod_check(pod); - if (rv == AP_GRACEFUL || rv == AP_RESTART) { - /* make sure the start thread has finished; - * signal_workers() and join_workers depend on that - */ - join_start_thread(start_thread_id); - signal_workers(); - break; - } - } - - if (rv == AP_GRACEFUL) { - /* 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). - */ - join_workers(threads); - } - } - - free(threads); - - clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 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 - */ - ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD, 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. */ - apr_sleep(10 * APR_USEC_PER_SEC); - - 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; -} - -/* 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; - - /* 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; - } - /* XXX if (!ps->quiescing) is probably more reliable GLA */ - 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) { - /* Kill off one child */ - ap_mpm_pod_signal(pod, TRUE); - 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, processed_status; - apr_proc_t pid; - int i; - - while (!restart_pending && !shutdown_pending) { - ap_wait_or_timeout(&exitwhy, &status, &pid, pconf); - - if (pid.pid != -1) { - processed_status = ap_process_child_status(&pid, exitwhy, status); - if (processed_status == APEXIT_CHILDFATAL) { - shutdown_pending = 1; - child_fatal = 1; - return; - } - /* 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_from_indexes(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 (processed_status == APEXIT_CHILDSICK) { - /* resource shortage, minimize the fork rate */ - idle_spawn_rate = 1; - } - else 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; - - ap_log_pid(pconf, ap_pid_fname); - - first_server_limit = server_limit; - first_thread_limit = thread_limit; - if (changed_limit_at_restart) { - ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_NOERRNO, 0, s, - "WARNING: Attempt to change ServerLimit or ThreadLimit " - "ignored during restart"); - changed_limit_at_restart = 0; - } - - /* Initialize cross-process accept lock */ - ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT, - ap_server_root_relative(_pconf, ap_lock_fname), - ap_my_pid); - - rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname, - ap_accept_lock_mech, _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_proc_mutex_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) { - if (ap_run_pre_mpm(pconf, SB_SHARED) != OK) { - return 1; - } - } - - 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... - */ - ap_mpm_pod_killpg(pod, ap_daemons_limit, TRUE); - ap_reclaim_child_processes(1); /* Start with SIGTERM */ - - if (!child_fatal) { - /* 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(); - - if (is_graceful) { - ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, - AP_SIG_GRACEFUL_STRING " received. Doing graceful restart"); - /* wake up the children...time to die. But we'll have more soon */ - ap_mpm_pod_killpg(pod, ap_daemons_limit, TRUE); - - - /* 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. - */ - ap_mpm_pod_killpg(pod, ap_daemons_limit, FALSE); - - 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; -} - -/* This really should be a post_config hook, but the error log is already - * redirected by that point, so we need to do this in the open_logs phase. - */ -static int worker_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) -{ - apr_status_t rv; - - pconf = p; - ap_server_conf = s; - - if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) { - ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT|APLOG_STARTUP, 0, - NULL, "no listening sockets available, shutting down"); - return DONE; - } - - if (!one_process) { - if ((rv = ap_mpm_pod_open(pconf, &pod))) { - ap_log_error(APLOG_MARK, APLOG_CRIT|APLOG_STARTUP, rv, NULL, - "Could not open pipe-of-death."); - return DONE; - } - } - return OK; -} - -static int worker_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; - apr_status_t rv; - - /* 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 { - 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) { - rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND - : APR_PROC_DETACH_DAEMONIZE); - if (rv != APR_SUCCESS) { - ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, - "apr_proc_detach failed"); - return HTTP_INTERNAL_SERVER_ERROR; - } - } - 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 = server_limit; - ap_threads_per_child = DEFAULT_THREADS_PER_CHILD; - ap_pid_fname = DEFAULT_PIDLOG; - 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)); - - return OK; -} - -static void worker_hooks(apr_pool_t *p) -{ - /* The worker open_logs phase must run before the core's, or stderr - * will be redirected to a file, and the messages won't print to the - * console. - */ - static const char *const aszSucc[] = {"core.c", NULL}; - one_process = 0; - - ap_hook_open_logs(worker_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE); - ap_hook_pre_config(worker_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_max_clients (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 > 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 ServerLimit value of %d.", - server_limit); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - " Automatically lowering MaxClients to %d. To increase,", - server_limit); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - " please see the ServerLimit directive."); - ap_daemons_limit = 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 > thread_limit) { - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "WARNING: ThreadsPerChild of %d exceeds ThreadLimit " - "value of %d", ap_threads_per_child, - thread_limit); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "threads, lowering ThreadsPerChild to %d. To increase, please" - " see the", thread_limit); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - " ThreadLimit directive."); - ap_threads_per_child = 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_server_limit (cmd_parms *cmd, void *dummy, const char *arg) -{ - int tmp_server_limit; - - const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); - if (err != NULL) { - return err; - } - - tmp_server_limit = atoi(arg); - /* you cannot change ServerLimit across a restart; ignore - * any such attempts - */ - if (first_server_limit && - tmp_server_limit != server_limit) { - /* how do we log a message? the error log is a bit bucket at this - * point; we'll just have to set a flag so that ap_mpm_run() - * logs a warning later - */ - changed_limit_at_restart = 1; - return NULL; - } - server_limit = tmp_server_limit; - - if (server_limit > MAX_SERVER_LIMIT) { - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "WARNING: ServerLimit of %d exceeds compile time limit " - "of %d servers,", server_limit, MAX_SERVER_LIMIT); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - " lowering ServerLimit to %d.", MAX_SERVER_LIMIT); - server_limit = MAX_SERVER_LIMIT; - } - else if (server_limit < 1) { - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "WARNING: Require ServerLimit > 0, setting to 1"); - server_limit = 1; - } - return NULL; -} - -static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg) -{ - int tmp_thread_limit; - - const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); - if (err != NULL) { - return err; - } - - tmp_thread_limit = atoi(arg); - /* you cannot change ThreadLimit across a restart; ignore - * any such attempts - */ - if (first_thread_limit && - tmp_thread_limit != thread_limit) { - /* how do we log a message? the error log is a bit bucket at this - * point; we'll just have to set a flag so that ap_mpm_run() - * logs a warning later - */ - changed_limit_at_restart = 1; - return NULL; - } - thread_limit = tmp_thread_limit; - - if (thread_limit > MAX_THREAD_LIMIT) { - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "WARNING: ThreadLimit of %d exceeds compile time limit " - "of %d servers,", thread_limit, MAX_THREAD_LIMIT); - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - " lowering ThreadLimit to %d.", MAX_THREAD_LIMIT); - thread_limit = MAX_THREAD_LIMIT; - } - else if (thread_limit < 1) { - ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, - "WARNING: Require ThreadLimit > 0, setting to 1"); - thread_limit = 1; - } - return NULL; -} - -static const command_rec worker_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_max_clients, 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("ServerLimit", set_server_limit, NULL, RSRC_CONF, - "Maximum value of MaxClients for this run of Apache"), -AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF, - "Maximum worker threads in a server for this run of Apache"), -{ 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 */ -}; - |