| /* ==================================================================== |
| * 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 */ |
| }; |
| |
