beos.c revision 1ce78cf71b5baaf2c1ab48e818cb1f2397df5010
e609c337f729875bc20e01096c7e610f45356f54nilgun/* Licensed to the Apache Software Foundation (ASF) under one or more
e609c337f729875bc20e01096c7e610f45356f54nilgun * contributor license agreements. See the NOTICE file distributed with
e609c337f729875bc20e01096c7e610f45356f54nilgun * this work for additional information regarding copyright ownership.
e609c337f729875bc20e01096c7e610f45356f54nilgun * The ASF licenses this file to You under the Apache License, Version 2.0
e609c337f729875bc20e01096c7e610f45356f54nilgun * (the "License"); you may not use this file except in compliance with
e609c337f729875bc20e01096c7e610f45356f54nilgun * the License. You may obtain a copy of the License at
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * http://www.apache.org/licenses/LICENSE-2.0
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * Unless required by applicable law or agreed to in writing, software
d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen * distributed under the License is distributed on an "AS IS" BASIS,
d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen * See the License for the specific language governing permissions and
d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen * limitations under the License.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun
d229f940abfb2490dee17979e9a5ff31b7012eb5rbowen/* The BeOS MPM!
3f08db06526d6901aa08c110b5bc7dde6bc39905nd *
e609c337f729875bc20e01096c7e610f45356f54nilgun * This is a single process, with multiple worker threads.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * Under testing I found that given the inability of BeOS to handle threads
3f08db06526d6901aa08c110b5bc7dde6bc39905nd * and forks it didn't make sense to try and have a set of "children" threads
e609c337f729875bc20e01096c7e610f45356f54nilgun * that spawned the "worker" threads, so just missed out the middle mand and
e609c337f729875bc20e01096c7e610f45356f54nilgun * somehow arrived here.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
f086b4b402fa9a2fefc7dda85de2a3cc1cd0a654rjung * For 2.1 this has been rewritten to have simpler logic, though there is still
e609c337f729875bc20e01096c7e610f45356f54nilgun * some simplification that can be done. It's still a work in progress!
e8897b2f72c5fc3bf4a5da96745a320a8b2acae7rbowen *
e609c337f729875bc20e01096c7e610f45356f54nilgun * TODO Items
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * - on exit most worker threads segfault trying to access a kernel page.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun#define CORE_PRIVATE
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun#include <kernel/OS.h>
e609c337f729875bc20e01096c7e610f45356f54nilgun#include <unistd.h>
e609c337f729875bc20e01096c7e610f45356f54nilgun#include <sys/socket.h>
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#include <signal.h>
e609c337f729875bc20e01096c7e610f45356f54nilgun
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh#include "apr_strings.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "apr_portable.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "httpd.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "http_main.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "http_log.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "http_config.h" /* for read_config */
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "http_core.h" /* for get_remote_host */
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#include "http_connection.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "ap_mpm.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "beosd.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "ap_listen.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "scoreboard.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "mpm_common.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "mpm.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "mpm_default.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "apr_thread_mutex.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun#include "apr_poll.h"
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunextern int _kset_fd_limit_(int num);
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* Limit on the total --- clients will be locked out if more servers than
e609c337f729875bc20e01096c7e610f45356f54nilgun * this are needed. It is intended solely to keep the server from crashing
e609c337f729875bc20e01096c7e610f45356f54nilgun * when things get out of hand.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * We keep a hard maximum number of servers, for two reasons:
e609c337f729875bc20e01096c7e610f45356f54nilgun * 1) in case something goes seriously wrong, we want to stop the server starting
e609c337f729875bc20e01096c7e610f45356f54nilgun * threads ad infinitum and crashing the server (remember that BeOS has a 192
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun * thread per team limit).
e609c337f729875bc20e01096c7e610f45356f54nilgun * 2) it keeps the size of the scoreboard file small
e609c337f729875bc20e01096c7e610f45356f54nilgun * enough that we can read the whole thing without worrying too much about
e609c337f729875bc20e01096c7e610f45356f54nilgun * the overhead.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* we only ever have 1 main process running... */
e609c337f729875bc20e01096c7e610f45356f54nilgun#define HARD_SERVER_LIMIT 1
e609c337f729875bc20e01096c7e610f45356f54nilgun
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun/* Limit on the threads per process. Clients will be locked out if more than
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun * this * HARD_SERVER_LIMIT are needed.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * We keep this for one reason it keeps the size of the scoreboard file small
e609c337f729875bc20e01096c7e610f45356f54nilgun * enough that we can read the whole thing without worrying too much about
e609c337f729875bc20e01096c7e610f45356f54nilgun * the overhead.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun#ifdef NO_THREADS
e609c337f729875bc20e01096c7e610f45356f54nilgun#define HARD_THREAD_LIMIT 1
e609c337f729875bc20e01096c7e610f45356f54nilgun#endif
e609c337f729875bc20e01096c7e610f45356f54nilgun#ifndef HARD_THREAD_LIMIT
e609c337f729875bc20e01096c7e610f45356f54nilgun#define HARD_THREAD_LIMIT 50
e609c337f729875bc20e01096c7e610f45356f54nilgun#endif
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/*
e609c337f729875bc20e01096c7e610f45356f54nilgun * Actual definitions of config globals
e609c337f729875bc20e01096c7e610f45356f54nilgun */
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgunstatic int ap_threads_to_start=0;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgunstatic int ap_max_requests_per_thread = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int min_spare_threads=0;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int max_spare_threads=0;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int ap_thread_limit=0;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int num_listening_sockets = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int mpm_state = AP_MPMQ_STARTING;
e609c337f729875bc20e01096c7e610f45356f54nilgunapr_thread_mutex_t *accept_mutex = NULL;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic apr_pool_t *pconf; /* Pool for config stuff */
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int server_pid;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/*
e609c337f729875bc20e01096c7e610f45356f54nilgun * The max child slot ever assigned, preserved across restarts. Necessary
e609c337f729875bc20e01096c7e610f45356f54nilgun * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We use
e609c337f729875bc20e01096c7e610f45356f54nilgun * this value to optimize routines that have to scan the entire scoreboard.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgunint ap_max_child_assigned = -1;
e609c337f729875bc20e01096c7e610f45356f54nilgunint ap_max_threads_limit = -1;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic apr_socket_t *udp_sock;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic apr_sockaddr_t *udp_sa;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunserver_rec *ap_server_conf;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* one_process */
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int one_process = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun#ifdef DEBUG_SIGSTOP
e609c337f729875bc20e01096c7e610f45356f54nilgunint raise_sigstop_flags;
e609c337f729875bc20e01096c7e610f45356f54nilgun#endif
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void check_restart(void *data);
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* When a worker thread gets to the end of it's life it dies with an
e609c337f729875bc20e01096c7e610f45356f54nilgun * exit value of the code supplied to this function. The thread has
e609c337f729875bc20e01096c7e610f45356f54nilgun * already had check_restart() registered to be called when dying, so
e609c337f729875bc20e01096c7e610f45356f54nilgun * we don't concern ourselves with restarting at all here. We do however
e609c337f729875bc20e01096c7e610f45356f54nilgun * mark the scoreboard slot as belonging to a dead server and zero out
e609c337f729875bc20e01096c7e610f45356f54nilgun * it's thread_id.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * TODO - use the status we set to determine if we need to restart the
e609c337f729875bc20e01096c7e610f45356f54nilgun * thread.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void clean_child_exit(int code, int slot)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun (void) ap_update_child_status_from_indexes(0, slot, SERVER_DEAD,
e609c337f729875bc20e01096c7e610f45356f54nilgun (request_rec*)NULL);
e609c337f729875bc20e01096c7e610f45356f54nilgun ap_scoreboard_image->servers[0][slot].tid = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgun exit_thread(code);
e609c337f729875bc20e01096c7e610f45356f54nilgun}
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/*****************************************************************
e609c337f729875bc20e01096c7e610f45356f54nilgun * Connection structures and accounting...
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* volatile just in case */
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int volatile shutdown_pending;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int volatile restart_pending;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int volatile is_graceful;
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic int volatile child_fatal;
e609c337f729875bc20e01096c7e610f45356f54nilgunap_generation_t volatile ap_my_generation = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/*
e609c337f729875bc20e01096c7e610f45356f54nilgun * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
e609c337f729875bc20e01096c7e610f45356f54nilgun * functions to initiate shutdown or restart without relying on signals.
e609c337f729875bc20e01096c7e610f45356f54nilgun * Previously this was initiated in sig_term() and restart() signal handlers,
e609c337f729875bc20e01096c7e610f45356f54nilgun * but we want to be able to start a shutdown/restart from other sources --
e609c337f729875bc20e01096c7e610f45356f54nilgun * e.g. on Win32, from the service manager. Now the service manager can
e609c337f729875bc20e01096c7e610f45356f54nilgun * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
e609c337f729875bc20e01096c7e610f45356f54nilgun * these functions can also be called by the child processes, since global
e609c337f729875bc20e01096c7e610f45356f54nilgun * variables are no longer used to pass on the required action to the parent.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * These should only be called from the parent process itself, since the
e609c337f729875bc20e01096c7e610f45356f54nilgun * parent process will use the shutdown_pending and restart_pending variables
e609c337f729875bc20e01096c7e610f45356f54nilgun * to determine whether to shutdown or restart. The child process should
e609c337f729875bc20e01096c7e610f45356f54nilgun * call signal_parent() directly to tell the parent to die -- this will
e609c337f729875bc20e01096c7e610f45356f54nilgun * cause neither of those variable to be set, which the parent will
e609c337f729875bc20e01096c7e610f45356f54nilgun * assume means something serious is wrong (which it will be, for the
e609c337f729875bc20e01096c7e610f45356f54nilgun * child to force an exit) and so do an exit anyway.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void ap_start_shutdown(void)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun /* If the user tries to shut us down twice in quick succession then we
e609c337f729875bc20e01096c7e610f45356f54nilgun * may well get triggered while we are working through previous attempt
e609c337f729875bc20e01096c7e610f45356f54nilgun * to shutdown. We won't worry about even reporting it as it seems a little
e609c337f729875bc20e01096c7e610f45356f54nilgun * pointless.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun if (shutdown_pending == 1)
e609c337f729875bc20e01096c7e610f45356f54nilgun return;
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun shutdown_pending = 1;
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun}
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* do a graceful restart if graceful == 1 */
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void ap_start_restart(int graceful)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun if (restart_pending == 1) {
e609c337f729875bc20e01096c7e610f45356f54nilgun /* Probably not an error - don't bother reporting it */
e609c337f729875bc20e01096c7e610f45356f54nilgun return;
e609c337f729875bc20e01096c7e610f45356f54nilgun }
e609c337f729875bc20e01096c7e610f45356f54nilgun restart_pending = 1;
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun is_graceful = graceful;
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun}
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun
91f378b5a10f2d83820902ed10ba7967a3920c18nilgun/* sig_coredump attempts to handle all the potential signals we
e609c337f729875bc20e01096c7e610f45356f54nilgun * may get that should result in a core dump. This is called from
e609c337f729875bc20e01096c7e610f45356f54nilgun * the signal handler routine, so when we enter we are essentially blocked
e609c337f729875bc20e01096c7e610f45356f54nilgun * on the signal. Once we exit we will allow the signal to be processed by
e609c337f729875bc20e01096c7e610f45356f54nilgun * system, which may or may not produce a .core file. All this function does
e609c337f729875bc20e01096c7e610f45356f54nilgun * is try and respect the users wishes about where that file should be
e609c337f729875bc20e01096c7e610f45356f54nilgun * located (chdir) and then signal the parent with the signal.
e609c337f729875bc20e01096c7e610f45356f54nilgun *
e609c337f729875bc20e01096c7e610f45356f54nilgun * If we called abort() the parent would only see SIGABRT which doesn't provide
e609c337f729875bc20e01096c7e610f45356f54nilgun * as much information.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void sig_coredump(int sig)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun chdir(ap_coredump_dir);
e609c337f729875bc20e01096c7e610f45356f54nilgun signal(sig, SIG_DFL);
e609c337f729875bc20e01096c7e610f45356f54nilgun kill(server_pid, sig);
e609c337f729875bc20e01096c7e610f45356f54nilgun}
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void sig_term(int sig)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun ap_start_shutdown();
e609c337f729875bc20e01096c7e610f45356f54nilgun}
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgunstatic void restart(int sig)
e609c337f729875bc20e01096c7e610f45356f54nilgun{
e609c337f729875bc20e01096c7e610f45356f54nilgun ap_start_restart(sig == AP_SIG_GRACEFUL);
e609c337f729875bc20e01096c7e610f45356f54nilgun}
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun/* Handle queries about our inner workings... */
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgunAP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun{
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun switch(query_code){
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_DAEMON_USED:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = ap_max_child_assigned;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_IS_THREADED:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = AP_MPMQ_DYNAMIC;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_IS_FORKED:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = AP_MPMQ_NOT_SUPPORTED;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_HARD_LIMIT_DAEMONS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = HARD_SERVER_LIMIT;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_HARD_LIMIT_THREADS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = HARD_THREAD_LIMIT;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_THREADS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = HARD_THREAD_LIMIT;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MIN_SPARE_DAEMONS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = 0;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MIN_SPARE_THREADS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = max_spare_threads;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_SPARE_DAEMONS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = 0;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_SPARE_THREADS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = min_spare_threads;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_REQUESTS_DAEMON:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = ap_max_requests_per_thread;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MAX_DAEMONS:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = HARD_SERVER_LIMIT;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case AP_MPMQ_MPM_STATE:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *result = mpm_state;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_SUCCESS;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun }
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return APR_ENOTIMPL;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun}
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun/* This accepts a connection and allows us to handle the error codes better than
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun * the previous code, while also making it more obvious.
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun */
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgunstatic apr_status_t beos_accept(void **accepted, ap_listen_rec *lr, apr_pool_t *ptrans)
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun{
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun apr_socket_t *csd;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun apr_status_t status;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun int sockdes;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *accepted = NULL;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun status = apr_socket_accept(&csd, lr->sd, ptrans);
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun if (status == APR_SUCCESS) {
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun *accepted = csd;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun apr_os_sock_get(&sockdes, csd);
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return status;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun }
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun if (APR_STATUS_IS_EINTR(status)) {
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun return status;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun }
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun /* This switch statement provides us with better error details. */
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun switch (status) {
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#ifdef ECONNABORTED
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case ECONNABORTED:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#endif
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#ifdef ETIMEDOUT
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case ETIMEDOUT:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#endif
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#ifdef EHOSTUNREACH
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case EHOSTUNREACH:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#endif
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#ifdef ENETUNREACH
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case ENETUNREACH:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#endif
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun break;
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun#ifdef ENETDOWN
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun case ENETDOWN:
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun /*
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun * When the network layer has been shut down, there
b9bf3918f6eaf7747bcbfbd02792bcbe4a052784nilgun * is not much use in simply exiting: the parent
e609c337f729875bc20e01096c7e610f45356f54nilgun * would simply re-create us (and we'd fail again).
e609c337f729875bc20e01096c7e610f45356f54nilgun * Use the CHILDFATAL code to tear the server down.
e609c337f729875bc20e01096c7e610f45356f54nilgun * @@@ Martin's idea for possible improvement:
e609c337f729875bc20e01096c7e610f45356f54nilgun * A different approach would be to define
e609c337f729875bc20e01096c7e610f45356f54nilgun * a new APEXIT_NETDOWN exit code, the reception
e609c337f729875bc20e01096c7e610f45356f54nilgun * of which would make the parent shutdown all
e609c337f729875bc20e01096c7e610f45356f54nilgun * children, then idle-loop until it detected that
e609c337f729875bc20e01096c7e610f45356f54nilgun * the network is up again, and restart the children.
e609c337f729875bc20e01096c7e610f45356f54nilgun * Ben Hyde noted that temporary ENETDOWN situations
e609c337f729875bc20e01096c7e610f45356f54nilgun * occur in mobile IP.
e609c337f729875bc20e01096c7e610f45356f54nilgun */
e609c337f729875bc20e01096c7e610f45356f54nilgun ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
e609c337f729875bc20e01096c7e610f45356f54nilgun "apr_socket_accept: giving up.");
e609c337f729875bc20e01096c7e610f45356f54nilgun return APR_EGENERAL;
e609c337f729875bc20e01096c7e610f45356f54nilgun#endif /*ENETDOWN*/
e609c337f729875bc20e01096c7e610f45356f54nilgun
e609c337f729875bc20e01096c7e610f45356f54nilgun default:
e609c337f729875bc20e01096c7e610f45356f54nilgun ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf,
f086b4b402fa9a2fefc7dda85de2a3cc1cd0a654rjung "apr_socket_accept: (client socket)");
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh return APR_EGENERAL;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh }
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh return status;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh}
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedoohstatic void tell_workers_to_exit(void)
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh{
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh apr_size_t len;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh int i = 0;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh for (i = 0 ; i < ap_max_child_assigned; i++){
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh len = 4;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh if (apr_socket_sendto(udp_sock, udp_sa, 0, "die!", &len) != APR_SUCCESS)
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh break;
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh }
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh}
30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh
5effc8b39fae5cd169d17f342bfc265705840014rbowenstatic void set_signals(void)
d229f940abfb2490dee17979e9a5ff31b7012eb5rbowen{
7fec19672a491661b2fe4b29f685bc7f4efa64d4nd struct sigaction sa;
7fec19672a491661b2fe4b29f685bc7f4efa64d4nd
7fec19672a491661b2fe4b29f685bc7f4efa64d4nd sigemptyset(&sa.sa_mask);
7fec19672a491661b2fe4b29f685bc7f4efa64d4nd sa.sa_flags = 0;
e609c337f729875bc20e01096c7e610f45356f54nilgun
/* The first batch get handled by sig_coredump */
if (!one_process) {
sa.sa_handler = sig_coredump;
if (sigaction(SIGSEGV, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
if (sigaction(SIGBUS, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
if (sigaction(SIGABRT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
if (sigaction(SIGILL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
sa.sa_flags = 0;
}
/* These next two are handled by sig_term */
sa.sa_handler = sig_term;
if (sigaction(SIGTERM, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
if (sigaction(SIGINT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
/* We ignore 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)");
/* 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 ")");
}
/*****************************************************************
* Here follows a long bunch of generic server bookkeeping stuff...
*/
int ap_graceful_stop_signalled(void)
{
return is_graceful;
}
/* This is the thread that actually does all the work. */
static int32 worker_thread(void *dummy)
{
int worker_slot = (int)dummy;
apr_allocator_t *allocator;
apr_bucket_alloc_t *bucket_alloc;
apr_status_t rv = APR_EINIT;
int last_poll_idx = 0;
sigset_t sig_mask;
int requests_this_child = 0;
apr_pollset_t *pollset = NULL;
ap_listen_rec *lr = NULL;
ap_sb_handle_t *sbh = NULL;
int i;
/* each worker thread is in control of its own destiny...*/
int this_worker_should_exit = 0;
/* We have 2 pools that we create/use throughout the lifetime of this
* worker. The first and longest lived is the pworker pool. From
* this we create the ptrans pool, the lifetime of which is the same
* as each connection and is reset prior to each attempt to
* process a connection.
*/
apr_pool_t *ptrans = NULL;
apr_pool_t *pworker = NULL;
mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
* child initializes
*/
on_exit_thread(check_restart, (void*)worker_slot);
/* block the signals for this thread only if we're not running as a
* single process.
*/
if (!one_process) {
sigfillset(&sig_mask);
sigprocmask(SIG_BLOCK, &sig_mask, NULL);
}
/* Each worker thread is fully in control of it's destinay and so
* to allow each thread to handle the lifetime of it's own resources
* we create and use a subcontext for every thread.
* The subcontext is a child of the pconf pool.
*/
apr_allocator_create(&allocator);
apr_allocator_max_free_set(allocator, ap_max_mem_free);
apr_pool_create_ex(&pworker, pconf, NULL, allocator);
apr_allocator_owner_set(allocator, pworker);
apr_pool_create(&ptrans, pworker);
apr_pool_tag(ptrans, "transaction");
ap_create_sb_handle(&sbh, pworker, 0, worker_slot);
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
/* We add an extra socket here as we add the udp_sock we use for signalling
* death. This gets added after the others.
*/
apr_pollset_create(&pollset, num_listening_sockets + 1, pworker, 0);
for (lr = ap_listeners, i = num_listening_sockets; i--; lr = lr->next) {
apr_pollfd_t pfd = {0};
pfd.desc_type = APR_POLL_SOCKET;
pfd.desc.s = lr->sd;
pfd.reqevents = APR_POLLIN;
pfd.client_data = lr;
apr_pollset_add(pollset, &pfd);
}
{
apr_pollfd_t pfd = {0};
pfd.desc_type = APR_POLL_SOCKET;
pfd.desc.s = udp_sock;
pfd.reqevents = APR_POLLIN;
apr_pollset_add(pollset, &pfd);
}
bucket_alloc = apr_bucket_alloc_create(pworker);
mpm_state = AP_MPMQ_RUNNING;
while (!this_worker_should_exit) {
conn_rec *current_conn;
void *csd;
/* (Re)initialize this child to a pre-connection state. */
apr_pool_clear(ptrans);
if ((ap_max_requests_per_thread > 0
&& requests_this_child++ >= ap_max_requests_per_thread))
clean_child_exit(0, worker_slot);
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
apr_thread_mutex_lock(accept_mutex);
/* We always (presently) have at least 2 sockets we listen on, so
* we don't have the ability for a fast path for a single socket
* as some MPM's allow :(
*/
for (;;) {
apr_int32_t numdesc = 0;
const apr_pollfd_t *pdesc = NULL;
rv = apr_pollset_poll(pollset, -1, &numdesc, &pdesc);
if (rv != APR_SUCCESS) {
if (APR_STATUS_IS_EINTR(rv)) {
if (one_process && shutdown_pending)
return;
continue;
}
ap_log_error(APLOG_MARK, APLOG_ERR, rv,
ap_server_conf, "apr_pollset_poll: (listen)");
clean_child_exit(1, worker_slot);
}
/* We can always use pdesc[0], but sockets at position N
* could end up completely starved of attention in a very
* busy server. Therefore, we round-robin across the
* returned set of descriptors. While it is possible that
* the returned set of descriptors might flip around and
* continue to starve some sockets, we happen to know the
* internal pollset implementation retains ordering
* stability of the sockets. Thus, the round-robin should
* ensure that a socket will eventually be serviced.
*/
if (last_poll_idx >= numdesc)
last_poll_idx = 0;
/* Grab a listener record from the client_data of the poll
* descriptor, and advance our saved index to round-robin
* the next fetch.
*
* ### hmm... this descriptor might have POLLERR rather
* ### than POLLIN
*/
lr = pdesc[last_poll_idx++].client_data;
/* The only socket we add without client_data is the first, the UDP socket
* we listen on for restart signals. If we've therefore gotten a hit on that
* listener lr will be NULL here and we know we've been told to die.
* Before we jump to the end of the while loop with this_worker_should_exit
* set to 1 (causing us to exit normally we hope) we release the accept_mutex
* as we want every thread to go through this same routine :)
* Bit of a hack, but compared to what I had before...
*/
if (lr == NULL) {
this_worker_should_exit = 1;
apr_thread_mutex_unlock(accept_mutex);
goto got_a_black_spot;
}
goto got_fd;
}
got_fd:
/* Run beos_accept to accept the connection and set things up to
* allow us to process it. We always release the accept_lock here,
* even if we failt o accept as otherwise we'll starve other workers
* which would be bad.
*/
rv = beos_accept(&csd, lr, ptrans);
apr_thread_mutex_unlock(accept_mutex);
if (rv == APR_EGENERAL) {
/* resource shortage or should-not-occur occured */
clean_child_exit(1, worker_slot);
} else if (rv != APR_SUCCESS)
continue;
current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, worker_slot, sbh, bucket_alloc);
if (current_conn) {
ap_process_connection(current_conn, csd);
ap_lingering_close(current_conn);
}
if (ap_my_generation !=
ap_scoreboard_image->global->running_generation) { /* restart? */
/* yeah, this could be non-graceful restart, in which case the
* parent will kill us soon enough, but why bother checking?
*/
this_worker_should_exit = 1;
}
got_a_black_spot:
}
apr_pool_destroy(ptrans);
apr_pool_destroy(pworker);
clean_child_exit(0, worker_slot);
}
static int make_worker(int slot)
{
thread_id tid;
if (slot + 1 > ap_max_child_assigned)
ap_max_child_assigned = slot + 1;
(void) ap_update_child_status_from_indexes(0, slot, SERVER_STARTING, (request_rec*)NULL);
if (one_process) {
set_signals();
ap_scoreboard_image->parent[0].pid = getpid();
ap_scoreboard_image->servers[0][slot].tid = find_thread(NULL);
return 0;
}
tid = spawn_thread(worker_thread, "apache_worker", B_NORMAL_PRIORITY,
(void *)slot);
if (tid < B_NO_ERROR) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL,
"spawn_thread: Unable to start a new thread");
/* In case system resources are maxed out, we don't want
* Apache running away with the CPU trying to fork over and
* over and over again.
*/
(void) ap_update_child_status_from_indexes(0, slot, SERVER_DEAD,
(request_rec*)NULL);
sleep(10);
return -1;
}
resume_thread(tid);
ap_scoreboard_image->servers[0][slot].tid = tid;
return 0;
}
/* When a worker thread exits, this function is called. If we are not in
* a shutdown situation then we restart the worker in the slot that was
* just vacated.
*/
static void check_restart(void *data)
{
if (!restart_pending && !shutdown_pending) {
int slot = (int)data;
make_worker(slot);
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL,
"spawning a new worker thread in slot %d", slot);
}
}
/* Start number_to_start children. This is used to start both the
* initial 'pool' of workers but also to replace existing workers who
* have reached the end of their time. It walks through the scoreboard to find
* an empty slot and starts the worker thread in that slot.
*/
static void startup_threads(int number_to_start)
{
int i;
for (i = 0; number_to_start && i < ap_thread_limit; ++i) {
if (ap_scoreboard_image->servers[0][i].tid)
continue;
if (make_worker(i) < 0)
break;
--number_to_start;
}
}
/*
* 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 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;
int free_length;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead = -1;
/* initialize the free_list */
free_length = 0;
for (i = 0; i < ap_thread_limit; ++i) {
if (ap_scoreboard_image->servers[0][i].tid == 0) {
if (free_length < spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
}
else {
last_non_dead = i;
}
if (i >= ap_max_child_assigned && free_length >= spawn_rate) {
break;
}
}
ap_max_child_assigned = last_non_dead + 1;
if (free_length > 0) {
for (i = 0; i < free_length; ++i) {
make_worker(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 (spawn_rate < MAX_SPAWN_RATE) {
spawn_rate *= 2;
}
} else {
spawn_rate = 1;
}
}
static void server_main_loop(int remaining_threads_to_start)
{
int child_slot;
apr_exit_why_e exitwhy;
int status;
apr_proc_t pid;
int i;
while (!restart_pending && !shutdown_pending) {
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
if (pid.pid >= 0) {
if (ap_process_child_status(&pid, exitwhy, status) == APEXIT_CHILDFATAL) {
shutdown_pending = 1;
child_fatal = 1;
return;
}
/* non-fatal death... note that it's gone in the scoreboard. */
child_slot = -1;
for (i = 0; i < ap_max_child_assigned; ++i) {
if (ap_scoreboard_image->servers[0][i].tid == pid.pid) {
child_slot = i;
break;
}
}
if (child_slot >= 0) {
ap_scoreboard_image->servers[0][child_slot].tid = 0;
(void) ap_update_child_status_from_indexes(0, child_slot,
SERVER_DEAD,
(request_rec*)NULL);
if (remaining_threads_to_start
&& child_slot < ap_thread_limit) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
make_worker(child_slot);
--remaining_threads_to_start;
}
/* TODO
#if APR_HAS_OTHER_CHILD
}
else if (apr_proc_other_child_refresh(&pid, status) == 0) {
#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)", 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_threads_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_threads(remaining_threads_to_start);
remaining_threads_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();
}
}
/* This is called to not only setup and run for the initial time, but also
* when we've asked for a restart. This means it must be able to handle both
* situations. It also means that when we exit here we should have tidied
* up after ourselves fully.
*/
int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
{
int remaining_threads_to_start, i,j;
apr_status_t rv;
ap_listen_rec *lr;
pconf = _pconf;
ap_server_conf = s;
/* Increase the available pool of fd's. This code from
* Joe Kloss <joek@be.com>
*/
if( FD_SETSIZE > 128 && (i = _kset_fd_limit_( 128 )) < 0 ){
ap_log_error(APLOG_MARK, APLOG_ERR, i, s,
"could not set FD_SETSIZE (_kset_fd_limit_ failed)");
}
/* BeOS R5 doesn't support pipes on select() calls, so we use a
* UDP socket as these are supported in both R5 and BONE. If we only cared
* about BONE we'd use a pipe, but there it is.
* As we have UDP support in APR, now use the APR functions and check all the
* return values...
*/
if (apr_sockaddr_info_get(&udp_sa, "127.0.0.1", APR_UNSPEC, 7772, 0, _pconf)
!= APR_SUCCESS){
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, s,
"couldn't create control socket information, shutting down");
return 1;
}
if (apr_socket_create(&udp_sock, udp_sa->family, SOCK_DGRAM, 0,
_pconf) != APR_SUCCESS){
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, s,
"couldn't create control socket, shutting down");
return 1;
}
if (apr_socket_bind(udp_sock, udp_sa) != APR_SUCCESS){
ap_log_error(APLOG_MARK, APLOG_ALERT, errno, s,
"couldn't bind UDP socket!");
return 1;
}
if ((num_listening_sockets = ap_setup_listeners(ap_server_conf)) < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s,
"no listening sockets available, shutting down");
return 1;
}
ap_log_pid(pconf, ap_pid_fname);
/*
* Create our locks...
*/
/* accept_mutex
* used to lock around select so we only have one thread
* in select at a time
*/
rv = apr_thread_mutex_create(&accept_mutex, 0, pconf);
if (rv != APR_SUCCESS) {
/* tsch tsch, can't have more than one thread in the accept loop
at a time so we need to fall on our sword... */
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
"Couldn't create accept lock");
return 1;
}
/*
* Startup/shutdown...
*/
if (!is_graceful) {
/* setup the scoreboard shared memory */
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
return 1;
}
for (i = 0; i < HARD_SERVER_LIMIT; i++) {
ap_scoreboard_image->parent[i].pid = 0;
for (j = 0;j < HARD_THREAD_LIMIT; j++)
ap_scoreboard_image->servers[i][j].tid = 0;
}
}
if (HARD_SERVER_LIMIT == 1)
ap_scoreboard_image->parent[0].pid = getpid();
set_signals();
/* Sanity checks to avoid thrashing... */
if (max_spare_threads < min_spare_threads )
max_spare_threads = min_spare_threads;
/* If we're doing a graceful_restart then we're going to see a lot
* of threads 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 threads_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_threads_to_start = ap_threads_to_start;
/* sanity check on the number to start... */
if (remaining_threads_to_start > ap_thread_limit) {
remaining_threads_to_start = ap_thread_limit;
}
/* If we're doing the single process thing or we're in a graceful_restart
* then we don't start threads here.
* if we're in one_process mode we don't want to start threads
* do we??
*/
if (!is_graceful && !one_process) {
startup_threads(remaining_threads_to_start);
remaining_threads_to_start = 0;
} else {
/* give the system some time to recover before kicking into
* exponential mode */
hold_off_on_exponential_spawning = 10;
}
/*
* record that we've entered the world !
*/
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"%s configured -- resuming normal operations",
ap_get_server_description());
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;
/* We sit in the server_main_loop() until we somehow manage to exit. When
* we do, we need to kill the workers we have, so we start by using the
* tell_workers_to_exit() function, but as it sometimes takes a short while
* to accomplish this we have a pause builtin to allow them the chance to
* gracefully exit.
*/
if (!one_process) {
server_main_loop(remaining_threads_to_start);
tell_workers_to_exit();
snooze(1000000);
} else {
worker_thread((void*)0);
}
mpm_state = AP_MPMQ_STOPPING;
/* close the UDP socket we've been using... */
apr_socket_close(udp_sock);
if ((one_process || shutdown_pending) && !child_fatal) {
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());
}
if (one_process) {
return 1;
}
/*
* If we get here we're shutting down...
*/
if (shutdown_pending) {
/* Time to gracefully shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
if (beosd_killpg(getpgrp(), SIGTERM) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
"killpg SIGTERM");
/* use ap_reclaim_child_processes starting with SIGTERM */
ap_reclaim_child_processes(1);
if (!child_fatal) { /* already recorded */
/* record the shutdown in the log */
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"caught SIGTERM, shutting down");
}
return 1;
}
/* we've been told to restart */
signal(SIGHUP, SIG_IGN);
if (is_graceful) {
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
AP_SIG_GRACEFUL_STRING " received. Doing graceful restart");
} 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_reclaim_child_processes(1); /* Start with SIGTERM */
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"SIGHUP received. Attempting to restart");
}
/* just before we go, tidy up the lock we created to prevent a
* potential leak of semaphores...
*/
apr_thread_mutex_destroy(accept_mutex);
return 0;
}
static int beos_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
{
static int restart_num = 0;
int no_detach, debug, foreground;
apr_status_t rv;
mpm_state = AP_MPMQ_STARTING;
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;
}
}
server_pid = getpid();
}
beosd_pre_config();
ap_listen_pre_config();
ap_threads_to_start = DEFAULT_START_THREADS;
min_spare_threads = DEFAULT_MIN_FREE_THREADS;
max_spare_threads = DEFAULT_MAX_FREE_THREADS;
ap_thread_limit = HARD_THREAD_LIMIT;
ap_pid_fname = DEFAULT_PIDLOG;
ap_max_requests_per_thread = DEFAULT_MAX_REQUESTS_PER_THREAD;
#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 int beos_check_config(apr_pool_t *pconf, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s)
{
static int restart_num = 0;
int startup = 0;
/* the reverse of pre_config, we want this only the first time around */
if (restart_num++ == 0) {
startup = 1;
}
if (ap_thread_limit > HARD_THREAD_LIMIT) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients of %d exceeds compile-time "
"limit of", ap_thread_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d servers, decreasing to %d.",
HARD_THREAD_LIMIT, HARD_THREAD_LIMIT);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" To increase, please see the HARD_THREAD_LIMIT"
"define in");
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" server/mpm/beos%s.", AP_MPM_HARD_LIMITS_FILE);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MaxClients of %d exceeds compile-time limit "
"of %d, decreasing to match",
ap_thread_limit, HARD_THREAD_LIMIT);
}
ap_thread_limit = HARD_THREAD_LIMIT;
}
else if (ap_thread_limit < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients of %d not allowed, "
"increasing to 1.", ap_thread_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MaxClients of %d not allowed, increasing to 1",
ap_thread_limit);
}
ap_thread_limit = 1;
}
/* ap_threads_to_start > ap_thread_limit checked in ap_mpm_run() */
if (ap_threads_to_start < 0) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: StartThreads of %d not allowed, "
"increasing to 1.", ap_threads_to_start);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"StartThreads of %d not allowed, increasing to 1",
ap_threads_to_start);
}
ap_threads_to_start = 1;
}
if (min_spare_threads < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MinSpareThreads of %d not allowed, "
"increasing to 1", min_spare_threads);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" to avoid almost certain server failure.");
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" Please read the documentation.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MinSpareThreads of %d not allowed, increasing to 1",
min_spare_threads);
}
min_spare_threads = 1;
}
/* max_spare_threads < min_spare_threads checked in ap_mpm_run() */
if (ap_max_requests_per_thread < 0) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MaxRequestsPerThread of %d not allowed, "
"increasing to 0,", ap_max_requests_per_thread);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" but this may not be what you want.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MaxRequestsPerThread of %d not allowed, "
"increasing to 0", ap_max_requests_per_thread);
}
ap_max_requests_per_thread = 0;
}
return OK;
}
static void beos_hooks(apr_pool_t *p)
{
one_process = 0;
ap_hook_pre_config(beos_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_check_config(beos_check_config, NULL, NULL, APR_HOOK_MIDDLE);
}
static const char *set_threads_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_threads_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);
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_threads_limit (cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_thread_limit = atoi(arg);
return NULL;
}
static const char *set_max_requests_per_thread (cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_max_requests_per_thread = atoi(arg);
return NULL;
}
static const command_rec beos_cmds[] = {
BEOS_DAEMON_COMMANDS,
LISTEN_COMMANDS,
AP_INIT_TAKE1( "StartThreads", set_threads_to_start, NULL, RSRC_CONF,
"Number of threads to launch 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_threads_limit, NULL, RSRC_CONF,
"Maximum number of children alive at the same time (max threads)" ),
AP_INIT_TAKE1( "MaxRequestsPerThread", set_max_requests_per_thread, NULL, RSRC_CONF,
"Maximum number of requests served by a thread" ),
{ NULL }
};
module AP_MODULE_DECLARE_DATA mpm_beos_module = {
MPM20_MODULE_STUFF,
NULL, /* hook to run before apache parses args */
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
beos_cmds, /* command apr_table_t */
beos_hooks /* register_hooks */
};