+++ /dev/null
-/* Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#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_cond.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 Leader/Follower 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 "mpm_common.h"
-#include "ap_listen.h"
-#include "scoreboard.h"
-#include "mpm_default.h"
-#include "apr_poll.h"
-
-#include <signal.h>
-#include <limits.h> /* for INT_MAX */
-
-#include "apr_atomic.h"
-
-/* 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 start_thread_may_exit = 0;
-static int requests_this_child;
-static int num_listensocks = 0;
-static int resource_shortage = 0;
-static int mpm_state = AP_MPMQ_STARTING;
-
-typedef struct worker_wakeup_info worker_wakeup_info;
-
-/* 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;
-
-/* This 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;
-
-/* 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
-
-
-/* Structure used to wake up an idle worker thread
- */
-struct worker_wakeup_info {
- apr_uint32_t next; /* index into worker_wakeups array,
- * used to build a linked list
- */
- apr_thread_cond_t *cond;
- apr_thread_mutex_t *mutex;
-};
-
-static worker_wakeup_info *worker_wakeup_create(apr_pool_t *pool)
-{
- apr_status_t rv;
- worker_wakeup_info *wakeup;
-
- wakeup = (worker_wakeup_info *)apr_palloc(pool, sizeof(*wakeup));
- if ((rv = apr_thread_cond_create(&wakeup->cond, pool)) != APR_SUCCESS) {
- return NULL;
- }
- if ((rv = apr_thread_mutex_create(&wakeup->mutex, APR_THREAD_MUTEX_DEFAULT,
- pool)) != APR_SUCCESS) {
- return NULL;
- }
- /* The wakeup's mutex will be unlocked automatically when
- * the worker blocks on the condition variable
- */
- apr_thread_mutex_lock(wakeup->mutex);
- return wakeup;
-}
-
-
-/* Structure used to hold a stack of idle worker threads
- */
-typedef struct {
- /* 'state' consists of several fields concatenated into a
- * single 32-bit int for use with the apr_atomic_cas() API:
- * state & STACK_FIRST is the thread ID of the first thread
- * in a linked list of idle threads
- * state & STACK_TERMINATED indicates whether the proc is shutting down
- * state & STACK_NO_LISTENER indicates whether the process has
- * no current listener thread
- */
- apr_uint32_t state;
-} worker_stack;
-
-#define STACK_FIRST 0xffff
-#define STACK_LIST_END 0xffff
-#define STACK_TERMINATED 0x10000
-#define STACK_NO_LISTENER 0x20000
-
-static worker_wakeup_info **worker_wakeups = NULL;
-
-static worker_stack* worker_stack_create(apr_pool_t *pool, apr_size_t max)
-{
- worker_stack *stack = (worker_stack *)apr_palloc(pool, sizeof(*stack));
- stack->state = STACK_NO_LISTENER | STACK_LIST_END;
- return stack;
-}
-
-static apr_status_t worker_stack_wait(worker_stack *stack,
- apr_uint32_t worker_id)
-{
- worker_wakeup_info *wakeup = worker_wakeups[worker_id];
-
- while (1) {
- apr_uint32_t state = stack->state;
- if (state & (STACK_TERMINATED | STACK_NO_LISTENER)) {
- if (state & STACK_TERMINATED) {
- return APR_EINVAL;
- }
- if (apr_atomic_cas(&(stack->state), STACK_LIST_END, state) !=
- state) {
- continue;
- }
- else {
- return APR_SUCCESS;
- }
- }
- wakeup->next = state;
- if (apr_atomic_cas(&(stack->state), worker_id, state) != state) {
- continue;
- }
- else {
- return apr_thread_cond_wait(wakeup->cond, wakeup->mutex);
- }
- }
-}
-
-static apr_status_t worker_stack_awaken_next(worker_stack *stack)
-{
-
- while (1) {
- apr_uint32_t state = stack->state;
- apr_uint32_t first = state & STACK_FIRST;
- if (first == STACK_LIST_END) {
- if (apr_atomic_cas(&(stack->state), state | STACK_NO_LISTENER,
- state) != state) {
- continue;
- }
- else {
- return APR_SUCCESS;
- }
- }
- else {
- worker_wakeup_info *wakeup = worker_wakeups[first];
- if (apr_atomic_cas(&(stack->state), (state ^ first) | wakeup->next,
- state) != state) {
- continue;
- }
- else {
- /* Acquire and release the idle worker's mutex to ensure
- * that it's actually waiting on its condition variable
- */
- apr_status_t rv;
- if ((rv = apr_thread_mutex_lock(wakeup->mutex)) !=
- APR_SUCCESS) {
- return rv;
- }
- if ((rv = apr_thread_mutex_unlock(wakeup->mutex)) !=
- APR_SUCCESS) {
- return rv;
- }
- return apr_thread_cond_signal(wakeup->cond);
- }
- }
- }
-}
-
-static apr_status_t worker_stack_term(worker_stack *stack)
-{
- int i;
- apr_status_t rv;
-
- while (1) {
- apr_uint32_t state = stack->state;
- if (apr_atomic_cas(&(stack->state), state | STACK_TERMINATED,
- state) == state) {
- break;
- }
- }
- for (i = 0; i < ap_threads_per_child; i++) {
- if ((rv = worker_stack_awaken_next(stack)) != APR_SUCCESS) {
- return rv;
- }
- }
- return APR_SUCCESS;
-}
-
-static worker_stack *idle_worker_stack;
-
-#define ST_INIT 0
-#define ST_GRACEFUL 1
-#define ST_UNGRACEFUL 2
-
-static int terminate_mode = ST_INIT;
-
-static void signal_threads(int mode)
-{
- if (terminate_mode == mode) {
- return;
- }
- terminate_mode = mode;
- mpm_state = AP_MPMQ_STOPPING;
- workers_may_exit = 1;
-
- worker_stack_term(idle_worker_stack);
-}
-
-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;
- case AP_MPMQ_MPM_STATE:
- *result = mpm_state;
- 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)
-{
- mpm_state = AP_MPMQ_STOPPING;
- if (pchild) {
- apr_pool_destroy(pchild);
- }
- ap_mpm_pod_close(pod);
- exit(code);
-}
-
-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)
-{
- mpm_state = AP_MPMQ_STOPPING;
- 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)
-{
- mpm_state = AP_MPMQ_STOPPING;
- if (restart_pending == 1) {
- /* Probably not an error - don't bother reporting it */
- return;
- }
- restart_pending = 1;
- is_graceful = graceful;
-}
-
-static void sig_term(int sig)
-{
- if (ap_my_pid == parent_pid) {
- ap_start_shutdown();
- }
- else {
- signal_threads(ST_GRACEFUL);
- }
-}
-
-static void restart(int sig)
-{
- ap_start_restart(sig == AP_SIG_GRACEFUL);
-}
-
-static void set_signals(void)
-{
-#ifndef NO_USE_SIGACTION
- struct sigaction sa;
-#endif
-
- if (!one_process) {
- ap_fatal_signal_setup(ap_server_conf, pconf);
- }
-
-#ifndef NO_USE_SIGACTION
- sigemptyset(&sa.sa_mask);
- 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) {
-#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, apr_bucket_alloc_t *bucket_alloc)
-{
- 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);
-
- current_conn = ap_run_create_connection(p, ap_server_conf, sock,
- conn_id, sbh, bucket_alloc);
- 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_threads(ST_GRACEFUL);
- }
- 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 unblock_signal(int sig)
-{
- sigset_t sig_mask;
-
- sigemptyset(&sig_mask);
- sigaddset(&sig_mask, sig);
-#if defined(SIGPROCMASK_SETS_THREAD_MASK)
- sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
-#else
- pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
-#endif
-}
-
-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_uint32_t my_worker_num = (apr_uint32_t)(ti->tid);
- apr_pool_t *tpool = apr_thread_pool_get(thd);
- void *csd = NULL;
- apr_allocator_t *allocator;
- apr_pool_t *ptrans; /* Pool for per-transaction stuff */
- apr_bucket_alloc_t *bucket_alloc;
- int n;
- apr_pollfd_t *pollset;
- apr_status_t rv;
- ap_listen_rec *lr, *last_lr = ap_listeners;
- int is_listener;
-
- ap_update_child_status_from_indexes(process_slot, thread_slot, SERVER_STARTING, NULL);
-
- free(ti);
-
- apr_allocator_create(&allocator);
- apr_allocator_max_free_set(allocator, ap_max_mem_free);
- /* XXX: why is ptrans's parent not tpool? --jcw 08/2003 */
- apr_pool_create_ex(&ptrans, NULL, NULL, allocator);
- apr_allocator_owner_set(allocator, ptrans);
- bucket_alloc = apr_bucket_alloc_create_ex(allocator);
-
- 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 */
- is_listener = 0;
- while (!workers_may_exit) {
-
- ap_update_child_status_from_indexes(process_slot, thread_slot,
- SERVER_READY, NULL);
- if (!is_listener) {
- /* Wait until it's our turn to become the listener */
- if ((rv = worker_stack_wait(idle_worker_stack, my_worker_num)) !=
- APR_SUCCESS) {
- if (rv != APR_EINVAL) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
- "worker_stack_wait failed. Shutting down");
- }
- break;
- }
- if (workers_may_exit) {
- break;
- }
- is_listener = 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 (workers_may_exit) {
- break;
- }
- 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_threads(ST_GRACEFUL);
- 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, num_listensocks, &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_threads(ST_GRACEFUL);
- }
-
- 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) {
- rv = lr->accept_func(&csd, lr, ptrans);
- /* later we trash rv and rely on csd to indicate success/failure */
- AP_DEBUG_ASSERT(rv == APR_SUCCESS || !csd);
-
- if (rv == APR_EGENERAL) {
- /* E[NM]FILE, ENOMEM, etc */
- resource_shortage = 1;
- signal_threads(ST_GRACEFUL);
- }
- if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(accept_mutex)))
- != APR_SUCCESS) {
- int level = APLOG_EMERG;
-
- if (workers_may_exit) {
- break;
- }
- 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_threads(ST_GRACEFUL);
- }
- if (csd != NULL) {
- is_listener = 0;
- worker_stack_awaken_next(idle_worker_stack);
- process_socket(ptrans, csd, process_slot,
- thread_slot, bucket_alloc);
- apr_pool_clear(ptrans);
- requests_this_child--;
- }
- if ((ap_mpm_pod_check(pod) == APR_SUCCESS) ||
- (ap_my_generation !=
- ap_scoreboard_image->global->running_generation)) {
- signal_threads(ST_GRACEFUL);
- break;
- }
- }
- 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_threads(ST_GRACEFUL);
- }
- break;
- }
- }
-
- dying = 1;
- ap_scoreboard_image->parent[process_slot].quiescing = 1;
-
- worker_stack_term(idle_worker_stack);
-
- ap_update_child_status_from_indexes(process_slot, thread_slot,
- (dying) ? SERVER_DEAD : SERVER_GRACEFUL, (request_rec *) NULL);
-
- apr_bucket_alloc_destroy(bucket_alloc);
-
- apr_thread_exit(thd, APR_SUCCESS);
- return NULL;
-}
-
-static int check_signal(int signum)
-{
- switch (signum) {
- case SIGTERM:
- case SIGINT:
- return 1;
- }
- return 0;
-}
-
-/* XXX under some circumstances not understood, children can get stuck
- * in start_threads forever trying to take over slots which will
- * never be cleaned up; for now there is an APLOG_DEBUG message issued
- * every so often when this condition occurs
- */
-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;
- apr_status_t rv;
- int i;
- int threads_created = 0;
- int loops;
- int prev_threads_created;
-
- idle_worker_stack = worker_stack_create(pchild, ap_threads_per_child);
- if (idle_worker_stack == NULL) {
- ap_log_error(APLOG_MARK, APLOG_ALERT, 0, ap_server_conf,
- "worker_stack_create() failed");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-
- worker_wakeups = (worker_wakeup_info **)
- apr_palloc(pchild, sizeof(worker_wakeup_info *) *
- ap_threads_per_child);
-
- loops = prev_threads_created = 0;
- while (1) {
- for (i = 0; i < ap_threads_per_child; i++) {
- int status = ap_scoreboard_image->servers[child_num_arg][i].status;
- worker_wakeup_info *wakeup;
-
- if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
- continue;
- }
-
- wakeup = worker_wakeup_create(pchild);
- if (wakeup == NULL) {
- ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0,
- ap_server_conf, "worker_wakeup_create failed");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
- worker_wakeups[threads_created] = wakeup;
- 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 (start_thread_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);
- ++loops;
- if (loops % 120 == 0) { /* every couple of minutes */
- if (prev_threads_created == threads_created) {
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
- "child %" APR_PID_T_FMT " isn't taking over "
- "slots very quickly (%d of %d)",
- ap_my_pid, threads_created, ap_threads_per_child);
- }
- prev_threads_created = threads_created;
- }
- }
-
- /* 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;
-
- start_thread_may_exit = 1; /* tell it to give up in case it is still
- * trying to take over slots from a
- * previous generation
- */
- 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;
-
- mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
- * child initializes
- */
-
- ap_my_pid = getpid();
- ap_fatal_signal_child_setup(ap_server_conf);
- 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);
- }
-
- 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);
- }
-
- mpm_state = AP_MPMQ_RUNNING;
-
- /* If we are only running in one_process mode, we will want to
- * still handle signals. */
- if (one_process) {
- /* Block until we get a terminating signal. */
- apr_signal_thread(check_signal);
- /* make sure the start thread has finished; signal_threads()
- * and join_workers() depend on that
- */
- /* XXX join_start_thread() won't be awakened if one of our
- * threads encounters a critical error and attempts to
- * shutdown this child
- */
- join_start_thread(start_thread_id);
- signal_threads(ST_UNGRACEFUL); /* helps us terminate a little more
- * quickly than 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 */
- /* remove SIGTERM from the set of blocked signals... if one of
- * the other threads in the process needs to take us down
- * (e.g., for MaxRequestsPerChild) it will send us SIGTERM
- */
- unblock_signal(SIGTERM);
- join_start_thread(start_thread_id);
- 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_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;
-
- 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);
- 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_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_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_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, 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");
- mpm_state = AP_MPMQ_STOPPING;
- 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; "
- "check User and Group directives");
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
- }
-
- if (!is_graceful) {
- if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
- mpm_state = AP_MPMQ_STOPPING;
- return 1;
- }
- /* fix the generation number in the global score; we just got a new,
- * cleared scoreboard
- */
- ap_scoreboard_image->global->running_generation = ap_my_generation;
- }
-
- 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_NOTICE, 0, ap_server_conf,
- "%s configured -- resuming normal operations",
- ap_get_server_version());
- ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
- "Server built: %s", ap_get_server_built());
-#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
- "AcceptMutex: %s (default: %s)",
- apr_proc_mutex_name(accept_mutex),
- apr_proc_mutex_defname());
-#endif
- restart_pending = shutdown_pending = 0;
- mpm_state = AP_MPMQ_RUNNING;
-
- server_main_loop(remaining_children_to_start);
- mpm_state = AP_MPMQ_STOPPING;
-
- if (shutdown_pending) {
- /* Time to gracefully shut down:
- * Kill child processes, tell them to call child_exit, etc...
- * (By "gracefully" we don't mean graceful in the same sense as
- * "apachectl graceful" where we allow old connections to finish.)
- */
- 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 */
-
- 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_INFO, 0,
- ap_server_conf,
- "removed PID file %s (pid=%ld)",
- pidfile, (long)getpid());
-
- ap_log_error(APLOG_MARK, 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;
-
- if (is_graceful) {
- ap_log_error(APLOG_MARK, 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);
-
-
- /* 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);
-
- ap_reclaim_child_processes(1); /* Start with SIGTERM */
- ap_log_error(APLOG_MARK, 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 leader_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_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 leader_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
- apr_pool_t *ptemp)
-{
- static int restart_num = 0;
- int no_detach, debug, foreground;
- ap_directive_t *pdir;
- ap_directive_t *max_clients = NULL;
- apr_status_t rv;
-
- mpm_state = AP_MPMQ_STARTING;
-
- /* 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) {
- foreground = one_process = 1;
- no_detach = 0;
- }
- else {
- one_process = ap_exists_config_define("ONE_PROCESS");
- no_detach = ap_exists_config_define("NO_DETACH");
- foreground = ap_exists_config_define("FOREGROUND");
- }
-
- /* sigh, want this only the second time around */
- if (restart_num++ == 1) {
- is_graceful = 0;
-
- if (!one_process && !foreground) {
- 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;
-#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE
- ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED;
-#endif
-
- apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
-
- return OK;
-}
-
-static void leader_hooks(apr_pool_t *p)
-{
- /* The leader 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(leader_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
- /* we need to set the MPM state before other pre-config hooks use MPM query
- * to retrieve it, so register as REALLY_FIRST
- */
- ap_hook_pre_config(leader_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
-}
-
-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, 0, NULL,
- "WARNING: detected MinSpareThreads set to non-positive.");
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- "Resetting to 1 to avoid almost certain Apache failure.");
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 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, 0, NULL,
- "WARNING: MaxClients (%d) must be at least as large",
- max_clients);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- " large as ThreadsPerChild (%d). Automatically",
- ap_threads_per_child);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 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, 0, NULL,
- "WARNING: MaxClients (%d) is not an integer multiple",
- max_clients);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 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, 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, 0, NULL,
- "WARNING: MaxClients of %d would require %d servers,",
- max_clients, ap_daemons_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- " and would exceed the ServerLimit value of %d.",
- server_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- " Automatically lowering MaxClients to %d. To increase,",
- server_limit * ap_threads_per_child);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 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, 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, 0, NULL,
- "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
- "value of %d", ap_threads_per_child,
- thread_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- "threads, lowering ThreadsPerChild to %d. To increase, please"
- " see the", thread_limit);
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
- " ThreadLimit directive.");
- ap_threads_per_child = thread_limit;
- }
- else if (ap_threads_per_child < 1) {
- ap_log_error(APLOG_MARK, APLOG_STARTUP, 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, 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, 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, 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, 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, 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, 0, NULL,
- "WARNING: Require ThreadLimit > 0, setting to 1");
- thread_limit = 1;
- }
- return NULL;
-}
-
-static const command_rec leader_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_leader_module = {
- MPM20_MODULE_STUFF,
- ap_mpm_rewrite_args, /* 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 */
- leader_cmds, /* command apr_table_t */
- leader_hooks /* register_hooks */
-};
-
Code Review / bottlenecks.git / blobdiff