--- /dev/null
+/* Copyright 2001-2004 The Apache Software Foundation
+ *
+ * Licensed 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.
+ */
+
+/**
+ * This MPM tries to fix the 'keep alive problem' in HTTP.
+ *
+ * After a client completes the first request, it can keep it open to send more
+ * requests with the same socket. This can save signifigant overhead in
+ * creating TCP connections. However, the major disadvantage is that Apache
+ * traditionally keeps an entire child process/thread waiting for data from
+ * the client. This MPM has a dedicated thread for handling both the
+ * Listenting sockets, and all sockets that are in a Keep Alive status.
+ *
+ * The MPM assumes the underlying apr_pollset implmentation is somewhat threadsafe.
+ * This currently is only comptaible with KQueue and EPoll. This enables the
+ * MPM to avoid extra high level locking or having to wake up the listener
+ * thread when a keep-alive socket needs to be sent to it.
+ *
+ * This MPM not preform well on older platforms that do not have very good
+ * threading, like Linux with a 2.4 kernel, but this does not matter, since we
+ * require EPoll or KQueue.
+ *
+ * For FreeBSD, use 5.3. It is possible to run this MPM
+ * on FreeBSD 5.2.1, if you use libkse (see `man libmap.conf`).
+ *
+ * For NetBSD, use at least 2.0.
+ *
+ * For Linux, you should use a2.6 kernel, and make sure your glibc has epoll
+ * support compiled in.
+ *
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_thread_mutex.h"
+#include "apr_proc_mutex.h"
+#include "apr_poll.h"
+#include "apr_ring.h"
+#include "apr_queue.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 Event MPM requires APR threads, but they are unavailable.
+#endif
+
+#define CORE_PRIVATE
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h" /* for read_config */
+#include "http_core.h" /* for get_remote_host */
+#include "http_connection.h"
+#include "ap_mpm.h"
+#include "pod.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "scoreboard.h"
+#include "fdqueue.h"
+#include "mpm_default.h"
+#include "http_vhost.h"
+
+#include <signal.h>
+#include <limits.h> /* for INT_MAX */
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed. It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table. Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 16
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 20000
+#endif
+
+/* Limit on the threads per process. Clients will be locked out if more than
+ * this 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 100000
+#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 listener_may_exit = 0;
+static int requests_this_child;
+static int num_listensocks = 0;
+static int resource_shortage = 0;
+static fd_queue_t *worker_queue;
+static fd_queue_info_t *worker_queue_info;
+static int mpm_state = AP_MPMQ_STARTING;
+
+apr_thread_mutex_t *timeout_mutex;
+APR_RING_HEAD(timeout_head_t, conn_state_t);
+static struct timeout_head_t timeout_head;
+
+static apr_pollset_t *event_pollset;
+
+/* 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;
+ apr_thread_t *listener;
+ int child_num_arg;
+ apr_threadattr_t *threadattr;
+} thread_starter;
+
+
+typedef struct
+{
+ int type;
+ int status;
+ void *baton;
+} listener_poll_type;
+
+#define PT_CSD 0
+#define PT_ACCEPT 1
+
+#define ID_FROM_CHILD_THREAD(c, t) ((c * thread_limit) + t)
+
+/*
+ * The max child slot ever assigned, preserved across restarts. Necessary
+ * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We
+ * use this value to optimize routines that have to scan the entire
+ * scoreboard.
+ */
+int ap_max_daemons_limit = -1;
+
+static ap_pod_t *pod;
+
+/* *Non*-shared http_main globals... */
+
+server_rec *ap_server_conf;
+
+/* The worker MPM respects a couple of runtime flags that can aid
+ * in debugging. Setting the -DNO_DETACH flag will prevent the root process
+ * from detaching from its controlling terminal. Additionally, setting
+ * the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the
+ * child_main loop running in the process which originally started up.
+ * This gives you a pretty nice debugging environment. (You'll get a SIGHUP
+ * early in standalone_main; just continue through. This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+#ifdef DEBUG_SIGSTOP
+int raise_sigstop_flags;
+#endif
+
+static apr_pool_t *pconf; /* Pool for config stuff */
+static apr_pool_t *pchild; /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main
+ thread. Use this instead */
+static pid_t parent_pid;
+static apr_os_thread_t *listener_os_thread;
+
+/* The LISTENER_SIGNAL signal will be sent from the main thread to the
+ * listener thread to wake it up for graceful termination (what a child
+ * process from an old generation does when the admin does "apachectl
+ * graceful"). This signal will be blocked in all threads of a child
+ * process except for the listener thread.
+ */
+#define LISTENER_SIGNAL SIGHUP
+
+/* An array of socket descriptors in use by each thread used to
+ * perform a non-graceful (forced) shutdown of the server. */
+static apr_socket_t **worker_sockets;
+
+static void close_worker_sockets(void)
+{
+ int i;
+ for (i = 0; i < ap_threads_per_child; i++) {
+ if (worker_sockets[i]) {
+ apr_socket_close(worker_sockets[i]);
+ worker_sockets[i] = NULL;
+ }
+ }
+}
+
+static void wakeup_listener(void)
+{
+ listener_may_exit = 1;
+ if (!listener_os_thread) {
+ /* XXX there is an obscure path that this doesn't handle perfectly:
+ * right after listener thread is created but before
+ * listener_os_thread is set, the first worker thread hits an
+ * error and starts graceful termination
+ */
+ return;
+ }
+ /*
+ * we should just be able to "kill(ap_my_pid, LISTENER_SIGNAL)" on all
+ * platforms and wake up the listener thread since it is the only thread
+ * with SIGHUP unblocked, but that doesn't work on Linux
+ */
+#ifdef HAVE_PTHREAD_KILL
+ pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
+#else
+ kill(ap_my_pid, LISTENER_SIGNAL);
+#endif
+}
+
+#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;
+
+ /* in case we weren't called from the listener thread, wake up the
+ * listener thread
+ */
+ wakeup_listener();
+
+ /* for ungraceful termination, let the workers exit now;
+ * for graceful termination, the listener thread will notify the
+ * workers to exit once it has stopped accepting new connections
+ */
+ if (mode == ST_UNGRACEFUL) {
+ workers_may_exit = 1;
+ ap_queue_interrupt_all(worker_queue);
+ ap_queue_info_term(worker_queue_info);
+ close_worker_sockets(); /* forcefully kill all current connections */
+ }
+}
+
+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_IS_ASYNC:
+ *result = 1;
+ 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);
+ }
+ 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)
+{
+ ap_start_shutdown();
+}
+
+static void restart(int sig)
+{
+ ap_start_restart(sig == AP_SIG_GRACEFUL);
+}
+
+static void set_signals(void)
+{
+#ifndef NO_USE_SIGACTION
+ struct sigaction sa;
+#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?
+ */
+{
+ /* note: for a graceful termination, listener_may_exit will be set before
+ * workers_may_exit, so check listener_may_exit
+ */
+ return listener_may_exit;
+}
+
+/*****************************************************************
+ * Child process main loop.
+ */
+
+static int process_socket(apr_pool_t * p, apr_socket_t * sock,
+ conn_state_t * cs, int my_child_num,
+ int my_thread_num)
+{
+ conn_rec *c;
+ listener_poll_type *pt;
+ long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
+ int csd;
+ int rc;
+ apr_time_t time_now = 0;
+ ap_sb_handle_t *sbh;
+
+ ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num);
+ apr_os_sock_get(&csd, sock);
+
+ time_now = apr_time_now();
+
+ if (cs == NULL) { /* This is a new connection */
+
+ cs = apr_pcalloc(p, sizeof(conn_state_t));
+
+ pt = apr_pcalloc(p, sizeof(*pt));
+
+ cs->bucket_alloc = apr_bucket_alloc_create(p);
+ c = ap_run_create_connection(p, ap_server_conf, sock,
+ conn_id, sbh, cs->bucket_alloc);
+ cs->c = c;
+ c->cs = cs;
+ cs->p = p;
+ cs->pfd.desc_type = APR_POLL_SOCKET;
+ cs->pfd.reqevents = APR_POLLIN;
+ cs->pfd.desc.s = sock;
+ pt->type = PT_CSD;
+ pt->status = 1;
+ pt->baton = cs;
+ cs->pfd.client_data = pt;
+
+ ap_update_vhost_given_ip(c);
+
+ rc = ap_run_pre_connection(c, sock);
+ if (rc != OK && rc != DONE) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "process_socket: connection aborted");
+ c->aborted = 1;
+ }
+
+ /**
+ * XXX If the platform does not have a usable way of bundling
+ * accept() with a socket readability check, like Win32,
+ * and there are measurable delays before the
+ * socket is readable due to the first data packet arriving,
+ * it might be better to create the cs on the listener thread,
+ * set the state to CONN_STATE_CHECK_REQUEST_LINE_READABLE,
+ * and give it to the event thread.
+ *
+ * FreeBSD users will want to enable the HTTP accept filter
+ * module in their kernel for the highest performance
+ * When the accept filter is active, sockets are kept in the
+ * kernel until a HTTP request is received.
+ */
+ cs->state = CONN_STATE_READ_REQUEST_LINE;
+
+ }
+ else {
+ c = cs->c;
+ c->sbh = sbh;
+ }
+
+ if (cs->state == CONN_STATE_READ_REQUEST_LINE) {
+ if (!c->aborted) {
+ ap_run_process_connection(c);
+
+ /* state will be updated upon return
+ * fall thru to either wait for readability/timeout or
+ * do lingering close
+ */
+ }
+ else {
+ cs->state = CONN_STATE_LINGER;
+ }
+ }
+
+ if (cs->state == CONN_STATE_LINGER) {
+ ap_lingering_close(c);
+ apr_bucket_alloc_destroy(cs->bucket_alloc);
+ apr_pool_clear(p);
+ ap_push_pool(worker_queue_info, p);
+ return 1;
+ }
+ else if (cs->state == CONN_STATE_CHECK_REQUEST_LINE_READABLE) {
+ apr_status_t rc;
+ listener_poll_type *pt = (listener_poll_type *) cs->pfd.client_data;
+
+ /* It greatly simplifies the logic to use a single timeout value here
+ * because the new element can just be added to the end of the list
+ * and it will stay sorted in expiration time sequence. If brand new
+ * sockets are sent to the event thread for a readability check, this
+ * will be a slight behavior change - they use the non-keepalive timeout
+ * today. With a normal client, the socket will be readable in a few
+ * milliseconds anyway.
+ */
+ cs->expiration_time = ap_server_conf->keep_alive_timeout + time_now;
+ apr_thread_mutex_lock(timeout_mutex);
+ APR_RING_INSERT_TAIL(&timeout_head, cs, conn_state_t, timeout_list);
+
+ pt->status = 0;
+ /* Add work to pollset. These are always read events */
+ rc = apr_pollset_add(event_pollset, &cs->pfd);
+
+ apr_thread_mutex_unlock(timeout_mutex);
+
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "process_socket: apr_pollset_add failure");
+ AP_DEBUG_ASSERT(rc == APR_SUCCESS);
+ }
+ }
+ return 0;
+}
+
+/* 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 dummy_signal_handler(int sig)
+{
+ /* XXX If specifying SIG_IGN is guaranteed to unblock a syscall,
+ * then we don't need this goofy function.
+ */
+}
+
+static apr_status_t push2worker(const apr_pollfd_t * pfd,
+ apr_pollset_t * pollset)
+{
+ listener_poll_type *pt = (listener_poll_type *) pfd->client_data;
+ conn_state_t *cs = (conn_state_t *) pt->baton;
+ apr_status_t rc;
+
+ if (pt->status == 1) {
+ return 0;
+ }
+
+ pt->status = 1;
+
+ rc = apr_pollset_remove(pollset, pfd);
+
+ /*
+ * Some of the pollset backends, like KQueue or Epoll
+ * automagically remove the FD if the socket is closed,
+ * therefore, we can accept _SUCCESS or _NOTFOUND,
+ * and we still want to keep going
+ */
+ if (rc != APR_SUCCESS && rc != APR_NOTFOUND) {
+ cs->state = CONN_STATE_LINGER;
+ }
+
+ rc = ap_queue_push(worker_queue, cs->pfd.desc.s, cs, cs->p);
+ if (rc != APR_SUCCESS) {
+ /* trash the connection; we couldn't queue the connected
+ * socket to a worker
+ */
+ apr_bucket_alloc_destroy(cs->bucket_alloc);
+ apr_socket_close(cs->pfd.desc.s);
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf, "push2worker: ap_queue_push failed");
+ apr_pool_clear(cs->p);
+ ap_push_pool(worker_queue_info, cs->p);
+ }
+
+ return APR_SUCCESS;
+}
+
+static void *listener_thread(apr_thread_t * thd, void *dummy)
+{
+ apr_status_t rc;
+ proc_info *ti = dummy;
+ int process_slot = ti->pid;
+ apr_pool_t *tpool = apr_thread_pool_get(thd);
+ void *csd = NULL;
+ apr_pool_t *ptrans; /* Pool for per-transaction stuff */
+ ap_listen_rec *lr;
+ int have_idle_worker = 0;
+ conn_state_t *cs;
+ const apr_pollfd_t *out_pfd;
+ apr_int32_t num = 0;
+ apr_time_t time_now = 0;
+ apr_interval_time_t timeout_interval;
+ apr_time_t timeout_time;
+ listener_poll_type *pt;
+
+ free(ti);
+
+ /* We set this to force apr_pollset to wakeup if there hasn't been any IO
+ * on any of its sockets. This allows sockets to have been added
+ * when no other keepalive operations where going on.
+ *
+ * current value is 1 second
+ */
+ timeout_interval = 1000000;
+
+ /* the following times out events that are really close in the future
+ * to prevent extra poll calls
+ *
+ * current value is .1 second
+ */
+#define TIMEOUT_FUDGE_FACTOR 100000
+
+ /* POLLSET_SCALE_FACTOR * ap_threads_per_child sets the size of
+ * the pollset. I've seen 15 connections per active worker thread
+ * running SPECweb99.
+ *
+ * However, with the newer apr_pollset, this is the number of sockets that
+ * we will return to any *one* call to poll(). Therefore, there is no
+ * reason to make it more than ap_threads_per_child.
+ */
+#define POLLSET_SCALE_FACTOR 1
+
+ rc = apr_thread_mutex_create(&timeout_mutex, APR_THREAD_MUTEX_DEFAULT,
+ tpool);
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "creation of the timeout mutex failed. Attempting to "
+ "shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ return NULL;
+ }
+
+ APR_RING_INIT(&timeout_head, conn_state_t, timeout_list);
+
+ /* Create the main pollset */
+ rc = apr_pollset_create(&event_pollset,
+ ap_threads_per_child * POLLSET_SCALE_FACTOR,
+ tpool, APR_POLLSET_THREADSAFE);
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "apr_pollset_create with Thread Safety failed. Attempting to "
+ "shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ return NULL;
+ }
+
+ for (lr = ap_listeners; lr != NULL; lr = lr->next) {
+ apr_pollfd_t pfd = { 0 };
+ pt = apr_pcalloc(tpool, sizeof(*pt));
+ pfd.desc_type = APR_POLL_SOCKET;
+ pfd.desc.s = lr->sd;
+ pfd.reqevents = APR_POLLIN;
+
+ pt->type = PT_ACCEPT;
+ pt->baton = lr;
+
+ pfd.client_data = pt;
+
+ apr_socket_opt_set(pfd.desc.s, APR_SO_NONBLOCK, 1);
+ apr_pollset_add(event_pollset, &pfd);
+ }
+
+ /* Unblock the signal used to wake this thread up, and set a handler for
+ * it.
+ */
+ unblock_signal(LISTENER_SIGNAL);
+ apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
+
+ while (1) {
+ /* TODO: requests_this_child should be synchronized - aaron */
+ if (requests_this_child <= 0) {
+ check_infinite_requests();
+ }
+
+ if (listener_may_exit)
+ break;
+
+ /* We've already decremented the idle worker count inside
+ * ap_queue_info_wait_for_idler. */
+ while (!listener_may_exit) {
+
+ rc = apr_pollset_poll(event_pollset, timeout_interval, &num,
+ &out_pfd);
+
+ if (rc != APR_SUCCESS) {
+ if (APR_STATUS_IS_EINTR(rc)) {
+ continue;
+ }
+ if (!APR_STATUS_IS_TIMEUP(rc)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "apr_pollset_poll failed. Attempting to "
+ "shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ }
+ }
+
+ if (listener_may_exit)
+ break;
+
+ while (num) {
+ pt = (listener_poll_type *) out_pfd->client_data;
+ if (pt->type == PT_CSD) {
+ /* one of the sockets is readable */
+ cs = (conn_state_t *) pt->baton;
+ switch (cs->state) {
+ case CONN_STATE_CHECK_REQUEST_LINE_READABLE:
+ cs->state = CONN_STATE_READ_REQUEST_LINE;
+ break;
+ default:
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc,
+ ap_server_conf,
+ "event_loop: unexpected state %d",
+ cs->state);
+ AP_DEBUG_ASSERT(0);
+ }
+
+ apr_thread_mutex_lock(timeout_mutex);
+ APR_RING_REMOVE(cs, timeout_list);
+ apr_thread_mutex_unlock(timeout_mutex);
+
+ rc = push2worker(out_pfd, event_pollset);
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf, "push2worker failed");
+ }
+ }
+ else {
+ /* A Listener Socket is ready for an accept() */
+ apr_pool_t *recycled_pool = NULL;
+
+ lr = (ap_listen_rec *) pt->baton;
+
+ ap_pop_pool(&recycled_pool, worker_queue_info);
+
+ /* create a new transaction pool for each accepted socket */
+ if (recycled_pool == NULL) {
+ /* create a new transaction pool for each accepted socket */
+ apr_allocator_t *allocator;
+
+ apr_allocator_create(&allocator);
+ apr_allocator_max_free_set(allocator,
+ ap_max_mem_free);
+ apr_pool_create_ex(&ptrans, NULL, NULL, allocator);
+ apr_allocator_owner_set(allocator, ptrans);
+ if (ptrans == NULL) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf,
+ "Failed to create transaction pool");
+ signal_threads(ST_GRACEFUL);
+ return NULL;
+ }
+ }
+ else {
+ ptrans = recycled_pool;
+ }
+
+ apr_pool_tag(ptrans, "transaction");
+
+ rc = lr->accept_func(&csd, lr, ptrans);
+
+ /* later we trash rv and rely on csd to indicate success/failure */
+
+ AP_DEBUG_ASSERT(rc == APR_SUCCESS || !csd);
+
+ if (rc == APR_EGENERAL) {
+ /* E[NM]FILE, ENOMEM, etc */
+ resource_shortage = 1;
+ signal_threads(ST_GRACEFUL);
+ }
+
+ if (csd != NULL) {
+ rc = ap_queue_push(worker_queue, csd, NULL, ptrans);
+ if (rc != APR_SUCCESS) {
+ /* trash the connection; we couldn't queue the connected
+ * socket to a worker
+ */
+ apr_socket_close(csd);
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf,
+ "ap_queue_push failed");
+ apr_pool_clear(ptrans);
+ ap_push_pool(worker_queue_info, ptrans);
+ }
+ else {
+ have_idle_worker = 0;
+ }
+ }
+ else {
+ apr_pool_clear(ptrans);
+ ap_push_pool(worker_queue_info, ptrans);
+ }
+ } /* if:else on pt->type */
+ out_pfd++;
+ num--;
+ } /* while for processing poll */
+
+ /* XXX possible optimization: stash the current time for use as
+ * r->request_time for new requests
+ */
+ time_now = apr_time_now();
+
+ /* handle timed out sockets */
+ apr_thread_mutex_lock(timeout_mutex);
+
+ cs = APR_RING_FIRST(&timeout_head);
+ timeout_time = time_now + TIMEOUT_FUDGE_FACTOR;
+ while (!APR_RING_EMPTY(&timeout_head, conn_state_t, timeout_list)
+ && cs->expiration_time < timeout_time) {
+ cs->state = CONN_STATE_LINGER;
+
+ APR_RING_REMOVE(cs, timeout_list);
+
+ rc = push2worker(&cs->pfd, event_pollset);
+
+ if (rc != APR_SUCCESS) {
+ return NULL;
+ }
+ cs = APR_RING_FIRST(&timeout_head);
+ }
+ apr_thread_mutex_unlock(timeout_mutex);
+
+ } /* while we are to keep listening */
+ } /* while 1 - main loop */
+
+ ap_queue_term(worker_queue);
+ dying = 1;
+ ap_scoreboard_image->parent[process_slot].quiescing = 1;
+
+ /* wake up the main thread */
+ kill(ap_my_pid, SIGTERM);
+
+ apr_thread_exit(thd, APR_SUCCESS);
+ return NULL;
+}
+
+/* XXX For ungraceful termination/restart, we definitely don't want to
+ * wait for active connections to finish but we may want to wait
+ * for idle workers to get out of the queue code and release mutexes,
+ * since those mutexes are cleaned up pretty soon and some systems
+ * may not react favorably (i.e., segfault) if operations are attempted
+ * on cleaned-up mutexes.
+ */
+static void *APR_THREAD_FUNC worker_thread(apr_thread_t * thd, void *dummy)
+{
+ proc_info *ti = dummy;
+ int process_slot = ti->pid;
+ int thread_slot = ti->tid;
+ apr_socket_t *csd = NULL;
+ conn_state_t *cs;
+ apr_pool_t *ptrans; /* Pool for per-transaction stuff */
+ apr_status_t rv;
+ int is_idle = 0;
+
+ free(ti);
+
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ SERVER_STARTING, NULL);
+
+ while (!workers_may_exit) {
+ if (!is_idle) {
+ rv = ap_queue_info_set_idle(worker_queue_info, NULL);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+ "ap_queue_info_set_idle failed. Attempting to "
+ "shutdown process gracefully.");
+ signal_threads(ST_GRACEFUL);
+ break;
+ }
+ is_idle = 1;
+ }
+
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ SERVER_READY, NULL);
+ worker_pop:
+ if (workers_may_exit) {
+ break;
+ }
+ rv = ap_queue_pop(worker_queue, &csd, &cs, &ptrans);
+
+ if (rv != APR_SUCCESS) {
+ /* We get APR_EOF during a graceful shutdown once all the connections
+ * accepted by this server process have been handled.
+ */
+ if (APR_STATUS_IS_EOF(rv)) {
+ break;
+ }
+ /* We get APR_EINTR whenever ap_queue_pop() has been interrupted
+ * from an explicit call to ap_queue_interrupt_all(). This allows
+ * us to unblock threads stuck in ap_queue_pop() when a shutdown
+ * is pending.
+ *
+ * If workers_may_exit is set and this is ungraceful termination/
+ * restart, we are bound to get an error on some systems (e.g.,
+ * AIX, which sanity-checks mutex operations) since the queue
+ * may have already been cleaned up. Don't log the "error" if
+ * workers_may_exit is set.
+ */
+ else if (APR_STATUS_IS_EINTR(rv)) {
+ goto worker_pop;
+ }
+ /* We got some other error. */
+ else if (!workers_may_exit) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
+ "ap_queue_pop failed");
+ }
+ continue;
+ }
+ is_idle = 0;
+ worker_sockets[thread_slot] = csd;
+ rv = process_socket(ptrans, csd, cs, process_slot, thread_slot);
+ if (!rv) {
+ requests_this_child--;
+ }
+ worker_sockets[thread_slot] = NULL;
+ }
+
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ (dying) ? SERVER_DEAD :
+ SERVER_GRACEFUL,
+ (request_rec *) NULL);
+
+ apr_thread_exit(thd, APR_SUCCESS);
+ return NULL;
+}
+
+static int check_signal(int signum)
+{
+ switch (signum) {
+ case SIGTERM:
+ case SIGINT:
+ return 1;
+ }
+ return 0;
+}
+
+
+
+static void create_listener_thread(thread_starter * ts)
+{
+ int my_child_num = ts->child_num_arg;
+ apr_threadattr_t *thread_attr = ts->threadattr;
+ proc_info *my_info;
+ apr_status_t rv;
+
+ my_info = (proc_info *) malloc(sizeof(proc_info));
+ my_info->pid = my_child_num;
+ my_info->tid = -1; /* listener thread doesn't have a thread slot */
+ my_info->sd = 0;
+ rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
+ my_info, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "apr_thread_create: unable to create listener thread");
+ /* In case system resources are maxxed out, we don't want
+ * Apache running away with the CPU trying to fork over and
+ * over and over again if we exit.
+ * XXX Jeff doesn't see how Apache is going to try to fork again since
+ * the exit code is APEXIT_CHILDFATAL
+ */
+ apr_sleep(apr_time_from_sec(10));
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+ apr_os_thread_get(&listener_os_thread, ts->listener);
+}
+
+/* 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 listener_started = 0;
+ int loops;
+ int prev_threads_created;
+
+ /* We must create the fd queues before we start up the listener
+ * and worker threads. */
+ worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
+ rv = ap_queue_init(worker_queue, ap_threads_per_child * 2, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "ap_queue_init() failed");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ rv = ap_queue_info_create(&worker_queue_info, pchild,
+ ap_threads_per_child);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "ap_queue_info_create() failed");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ worker_sockets = apr_pcalloc(pchild, ap_threads_per_child
+ * sizeof(apr_socket_t *));
+
+ loops = prev_threads_created = 0;
+ while (1) {
+ /* ap_threads_per_child does not include the listener thread */
+ for (i = 0; i < ap_threads_per_child; i++) {
+ int status =
+ ap_scoreboard_image->servers[child_num_arg][i].status;
+
+ if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
+ continue;
+ }
+
+ my_info = (proc_info *) malloc(sizeof(proc_info));
+ if (my_info == NULL) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
+ "malloc: out of memory");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+ my_info->pid = my_child_num;
+ my_info->tid = i;
+ my_info->sd = 0;
+
+ /* We are creating threads right now */
+ ap_update_child_status_from_indexes(my_child_num, i,
+ SERVER_STARTING, NULL);
+ /* We let each thread update its own scoreboard entry. This is
+ * done because it lets us deal with tid better.
+ */
+ rv = apr_thread_create(&threads[i], thread_attr,
+ worker_thread, my_info, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "apr_thread_create: unable to create worker thread");
+ /* In case system resources are maxxed out, we don't want
+ Apache running away with the CPU trying to fork over and
+ over and over again if we exit. */
+ apr_sleep(apr_time_from_sec(10));
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+ threads_created++;
+ }
+
+ /* Start the listener only when there are workers available */
+ if (!listener_started && threads_created) {
+ create_listener_thread(ts);
+ listener_started = 1;
+ }
+
+
+ if (start_thread_may_exit || threads_created == ap_threads_per_child) {
+ break;
+ }
+ /* wait for previous generation to clean up an entry */
+ apr_sleep(apr_time_from_sec(1));
+ ++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 * listener, apr_thread_t ** threads)
+{
+ int i;
+ apr_status_t rv, thread_rv;
+
+ if (listener) {
+ int iter;
+
+ /* deal with a rare timing window which affects waking up the
+ * listener thread... if the signal sent to the listener thread
+ * is delivered between the time it verifies that the
+ * listener_may_exit flag is clear and the time it enters a
+ * blocking syscall, the signal didn't do any good... work around
+ * that by sleeping briefly and sending it again
+ */
+
+ iter = 0;
+ while (iter < 10 &&
+#ifdef HAVE_PTHREAD_KILL
+ pthread_kill(*listener_os_thread, 0)
+#else
+ kill(ap_my_pid, 0)
+#endif
+ == 0) {
+ /* listener not dead yet */
+ apr_sleep(apr_time_make(0, 500000));
+ wakeup_listener();
+ ++iter;
+ }
+ if (iter >= 10) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "the listener thread didn't exit");
+ }
+ else {
+ rv = apr_thread_join(&thread_rv, listener);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
+ "apr_thread_join: unable to join listener thread");
+ }
+ }
+ }
+
+ 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);
+
+ 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);
+
+ if (ap_thread_stacksize != 0) {
+ apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
+ }
+
+ ts->threads = threads;
+ ts->listener = NULL;
+ 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(apr_time_from_sec(10));
+ 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(ts->listener, 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);
+ apr_signal(SIGTERM, dummy_signal_handler);
+ /* Watch for any messages from the parent over the POD */
+ while (1) {
+ rv = ap_mpm_pod_check(pod);
+ if (rv == AP_NORESTART) {
+ /* see if termination was triggered while we slept */
+ switch (terminate_mode) {
+ case ST_GRACEFUL:
+ rv = AP_GRACEFUL;
+ break;
+ case ST_UNGRACEFUL:
+ rv = AP_RESTART;
+ break;
+ }
+ }
+ if (rv == AP_GRACEFUL || rv == AP_RESTART) {
+ /* make sure the start thread has finished;
+ * signal_threads() and join_workers depend on that
+ */
+ join_start_thread(start_thread_id);
+ signal_threads(rv ==
+ AP_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
+ break;
+ }
+ }
+
+ /* 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(ts->listener, 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(apr_time_from_sec(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_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
+ && free_length < MAX_SPAWN_RATE
+ && (!ps->pid /* no process in the slot */
+ || ps->quiescing)) { /* or at least one is going away */
+ if (all_dead_threads) {
+ /* great! we prefer these, because the new process can
+ * start more threads sooner. So prioritize this slot
+ * by putting it ahead of any slots with active threads.
+ *
+ * first, make room by moving a slot that's potentially still
+ * in use to the end of the array
+ */
+ free_slots[free_length] = free_slots[totally_free_length];
+ free_slots[totally_free_length++] = i;
+ }
+ else {
+ /* slot is still in use - back of the bus
+ */
+ free_slots[free_length] = i;
+ }
+ ++free_length;
+ }
+ /* XXX if (!ps->quiescing) is probably more reliable GLA */
+ if (!any_dying_threads) {
+ last_non_dead = i;
+ ++total_non_dead;
+ }
+ }
+ ap_max_daemons_limit = last_non_dead + 1;
+
+ if (idle_thread_count > max_spare_threads) {
+ /* Kill off one child */
+ ap_mpm_pod_signal(pod, TRUE);
+ idle_spawn_rate = 1;
+ }
+ else if (idle_thread_count < min_spare_threads) {
+ /* terminate the free list */
+ if (free_length == 0) {
+ /* only report this condition once */
+ static int reported = 0;
+
+ if (!reported) {
+ ap_log_error(APLOG_MARK, APLOG_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_alert(&pid, APR_OC_REASON_DEATH,
+ 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;
+
+ 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;
+ }
+
+ 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());
+
+ 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.)
+ */
+ ap_mpm_pod_killpg(pod, ap_daemons_limit, FALSE);
+ 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, TRUE);
+
+
+ /* This is mostly for debugging... so that we know what is still
+ * gracefully dealing with existing request.
+ */
+
+ }
+ else {
+ /* Kill 'em all. Since the child acts the same on the parents SIGTERM
+ * and a SIGHUP, we may as well use the same signal, because some user
+ * pthreads are stealing signals from us left and right.
+ */
+ ap_mpm_pod_killpg(pod, ap_daemons_limit, FALSE);
+
+ ap_reclaim_child_processes(1); /* Start with SIGTERM */
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
+ "SIGHUP received. Attempting to restart");
+ }
+
+ return 0;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int worker_open_logs(apr_pool_t * p, apr_pool_t * plog,
+ apr_pool_t * ptemp, server_rec * s)
+{
+ apr_status_t rv;
+
+ pconf = p;
+ ap_server_conf = s;
+
+ if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT | APLOG_STARTUP, 0,
+ NULL, "no listening sockets available, shutting down");
+ return DONE;
+ }
+
+ if (!one_process) {
+ if ((rv = ap_mpm_pod_open(pconf, &pod))) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT | APLOG_STARTUP, rv, NULL,
+ "Could not open pipe-of-death.");
+ return DONE;
+ }
+ }
+ return OK;
+}
+
+static int worker_pre_config(apr_pool_t * pconf, apr_pool_t * plog,
+ apr_pool_t * ptemp)
+{
+ static int restart_num = 0;
+ int no_detach, debug, 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;
+ rv = apr_pollset_create(&event_pollset, 1, plog,
+ APR_POLLSET_THREADSAFE);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
+ "Couldn't create a Thread Safe Pollset. "
+ "Is it supported on your platform?");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ apr_pollset_destroy(event_pollset);
+
+ 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 event_hooks(apr_pool_t * p)
+{
+ /* The worker open_logs phase must run before the core's, or stderr
+ * will be redirected to a file, and the messages won't print to the
+ * console.
+ */
+ static const char *const aszSucc[] = { "core.c", NULL };
+ one_process = 0;
+
+ ap_hook_open_logs(worker_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
+ /* 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(worker_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,
+ " 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 event_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("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+ "Maximum number of child processes for this run of Apache"),
+ AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+ "Minimum number of idle threads, to handle request spikes"),
+ AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+ "Maximum number of idle threads"),
+ AP_INIT_TAKE1("MaxClients", set_max_clients, NULL, RSRC_CONF,
+ "Maximum number of threads 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("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+ "Maximum number of worker threads per child process for this "
+ "run of Apache - Upper limit for ThreadsPerChild"),
+ {NULL}
+};
+
+module AP_MODULE_DECLARE_DATA mpm_event_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 */
+ event_cmds, /* command apr_table_t */
+ event_hooks /* register_hooks */
+};
projects / apache / commitdiff