From: Ryan Bloom Date: Mon, 30 Jul 2001 05:02:53 +0000 (+0000) Subject: Add the worker MPM. The name is probably horrible, but I couldn't come X-Git-Tag: 2.0.23~153 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6371b63d9824fd61598b6ace5b1cb07c1dac45f;p=thirdparty%2Fapache%2Fhttpd.git Add the worker MPM. The name is probably horrible, but I couldn't come up with anything better. This is a multiple-worker/single listener MPM. This MPM is definately not complete, but it is a first step in the right direction. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89781 13f79535-47bb-0310-9956-ffa450edef68 --- diff --git a/CHANGES b/CHANGES index 825886538ac..d5719a43deb 100644 --- a/CHANGES +++ b/CHANGES @@ -1,5 +1,10 @@ Changes with Apache 2.0.23 + *) Add a single listener/multiple worker MPM. This MPM is + definately not fully correct, but it allows us to solve many + of the problems that exist in the threaded MPM. This is a + modified version of the threaded MPM. [Ryan Bloom] + *) Improve content generation throughout Apache, providing closer compliance with HTML 3.2, HTML 4.01 Transitional and XHTML 1.0 Transitional specifications. [William Rowe] diff --git a/server/mpm/config.m4 b/server/mpm/config.m4 index cce54892f10..00de8f8cc13 100644 --- a/server/mpm/config.m4 +++ b/server/mpm/config.m4 @@ -1,7 +1,7 @@ AC_MSG_CHECKING(which MPM to use) AC_ARG_WITH(mpm, [ --with-mpm=MPM Choose the process model for Apache to use. - MPM={beos,threaded,prefork,spmt_os2,perchild}],[ + MPM={beos,worker,threaded,prefork,spmt_os2,perchild}],[ APACHE_MPM=$withval ],[ if test "x$APACHE_MPM" = "x"; then @@ -12,7 +12,7 @@ AC_MSG_RESULT($APACHE_MPM) apache_cv_mpm=$APACHE_MPM -if test "$apache_cv_mpm" = "threaded" -o "$apache_cv_mpm" = "perchild"; then +if test "$apache_cv_mpm" = "threaded" -o "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "perchild"; then APR_CHECK_APR_DEFINE(APR_HAS_THREADS, srclib/apr) if test "x$ac_cv_define_APR_HAS_THREADS" = "xno"; then diff --git a/server/mpm/worker/.cvsignore b/server/mpm/worker/.cvsignore new file mode 100644 index 00000000000..84df2572148 --- /dev/null +++ b/server/mpm/worker/.cvsignore @@ -0,0 +1,5 @@ +.deps +.libs +*.lo +*.la +Makefile diff --git a/server/mpm/worker/Makefile.in b/server/mpm/worker/Makefile.in new file mode 100644 index 00000000000..64a02436f3c --- /dev/null +++ b/server/mpm/worker/Makefile.in @@ -0,0 +1,5 @@ + +LTLIBRARY_NAME = libworker.la +LTLIBRARY_SOURCES = worker.c fdqueue.c + +include $(top_srcdir)/build/ltlib.mk diff --git a/server/mpm/worker/config5.m4 b/server/mpm/worker/config5.m4 new file mode 100644 index 00000000000..52ab50e82ce --- /dev/null +++ b/server/mpm/worker/config5.m4 @@ -0,0 +1,5 @@ +dnl ## XXX - Need a more thorough check of the proper flags to use + +if test "$MPM_NAME" = "worker" ; then + APACHE_FAST_OUTPUT(server/mpm/$MPM_NAME/Makefile) +fi diff --git a/server/mpm/worker/fdqueue.c b/server/mpm/worker/fdqueue.c new file mode 100644 index 00000000000..147a3b7a946 --- /dev/null +++ b/server/mpm/worker/fdqueue.c @@ -0,0 +1,161 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000-2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * . + * + * Portions of this software are based upon public domain software + * originally written at the National Center for Supercomputing Applications, + * University of Illinois, Urbana-Champaign. + */ + +#include "fdqueue.h" +#include "apr_pools.h" + +/* Assumption: queue itself is allocated by the user */ +/* Assumption: increment and decrement are atomic on int */ + +int ap_queue_size(FDQueue *queue) { + return ((queue->tail - queue->head + queue->bounds) % queue->bounds); +} + +int ap_queue_full(FDQueue *queue) { + return(queue->blanks <= 0); +} + +int ap_block_on_queue(FDQueue *queue) { +#if 0 + if (pthread_mutex_lock(&queue->one_big_mutex) != 0) { + return FD_QUEUE_FAILURE; + } +#endif + if (ap_queue_full(queue)) { + pthread_cond_wait(&queue->not_full, &queue->one_big_mutex); + } +#if 0 + if (pthread_mutex_unlock(&queue->one_big_mutex) != 0) { + return FD_QUEUE_FAILURE; + } +#endif + return FD_QUEUE_SUCCESS; +} + +static int increase_blanks(FDQueue *queue) { + queue->blanks++; + return FD_QUEUE_SUCCESS; +} + +static apr_status_t ap_queue_destroy(void *data) { + FDQueue *queue = data; + /* Ignore errors here, we can't do anything about them anyway */ + pthread_cond_destroy(&queue->not_empty); + pthread_cond_destroy(&queue->not_full); + pthread_mutex_destroy(&queue->one_big_mutex); + return FD_QUEUE_SUCCESS; +} + +int ap_queue_init(FDQueue *queue, int queue_capacity, apr_pool_t *a) { + int i; + int bounds = queue_capacity + 1; + pthread_mutex_init(&queue->one_big_mutex, NULL); + pthread_cond_init(&queue->not_empty, NULL); + pthread_cond_init(&queue->not_full, NULL); + queue->head = queue->tail = 0; + queue->data = apr_palloc(a, bounds * sizeof(FDQueueElement)); + queue->bounds = bounds; + queue->blanks = queue_capacity; + apr_pool_cleanup_register(a, queue, ap_queue_destroy, apr_pool_cleanup_null); + for (i=0; i < bounds; ++i) + queue->data[i].sd = NULL; + return FD_QUEUE_SUCCESS; +} + +int ap_queue_push(FDQueue *queue, apr_socket_t *sd, apr_pool_t *p) { + queue->data[queue->tail].sd = sd; + queue->data[queue->tail].p = p; + queue->tail = (queue->tail + 1) % queue->bounds; + queue->blanks--; + pthread_cond_signal(&queue->not_empty); +#if 0 + if (queue->head == (queue->tail + 1) % queue->bounds) { +#endif + if (ap_queue_full(queue)) { + pthread_cond_wait(&queue->not_full, &queue->one_big_mutex); + } + return FD_QUEUE_SUCCESS; +} + +apr_status_t ap_queue_pop(FDQueue *queue, apr_socket_t **sd, apr_pool_t **p, int block_if_empty) { + increase_blanks(queue); + /* We have just removed one from the queue. By definition, it is + * no longer full. We can ALWAYS signal the listener thread at + * this point. However, the original code didn't do it this way, + * so I am leaving the original code in, just commented out. BTW, + * originally, the increase_blanks wasn't in this function either. + * + if (queue->blanks > 0) { + */ + pthread_cond_signal(&queue->not_full); + + /* } */ + if (queue->head == queue->tail) { + if (block_if_empty) { + pthread_cond_wait(&queue->not_empty, &queue->one_big_mutex); + } + } + + *sd = queue->data[queue->head].sd; + *p = queue->data[queue->head].p; + queue->data[queue->head].sd = NULL; + if (*sd != NULL) { + queue->head = (queue->head + 1) % queue->bounds; + } + return APR_SUCCESS; +} diff --git a/server/mpm/worker/fdqueue.h b/server/mpm/worker/fdqueue.h new file mode 100644 index 00000000000..b1cab2d0186 --- /dev/null +++ b/server/mpm/worker/fdqueue.h @@ -0,0 +1,95 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000-2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * . + * + * Portions of this software are based upon public domain software + * originally written at the National Center for Supercomputing Applications, + * University of Illinois, Urbana-Champaign. + */ + +#ifndef FDQUEUE_H +#define FDQUEUE_H +#include "httpd.h" +#include +#include +#include +#include +#include + +#define FD_QUEUE_SUCCESS 0 +#define FD_QUEUE_FAILURE -1 /* Needs to be an invalid file descriptor because + of queue_pop semantics */ + +typedef struct fd_queue_elem { + apr_socket_t *sd; + apr_pool_t *p; +} FDQueueElement; + +typedef struct fd_queue { + int head; + int tail; + FDQueueElement *data; + int bounds; + int blanks; + pthread_mutex_t one_big_mutex; + pthread_cond_t not_empty; + pthread_cond_t not_full; +} FDQueue; + +int ap_queue_init(FDQueue *queue, int queue_size, apr_pool_t *a); +int ap_queue_push(FDQueue *queue, apr_socket_t *sd, apr_pool_t *p); +apr_status_t ap_queue_pop(FDQueue *queue, apr_socket_t **sd, apr_pool_t **p, int block_if_empty); +int ap_queue_size(FDQueue *queue); +int ap_queue_full(FDQueue *queue); +int ap_block_on_queue(FDQueue *queue); + +#endif /* FDQUEUE_H */ diff --git a/server/mpm/worker/mpm.h b/server/mpm/worker/mpm.h new file mode 100644 index 00000000000..23ed27c1ea0 --- /dev/null +++ b/server/mpm/worker/mpm.h @@ -0,0 +1,78 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000-2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * . + * + * Portions of this software are based upon public domain software + * originally written at the National Center for Supercomputing Applications, + * University of Illinois, Urbana-Champaign. + */ +#include "scoreboard.h" +#include "unixd.h" + +#ifndef APACHE_MPM_WORKER_H +#define APACHE_MPM_WORKER_H + +#define WORKER_MPM + +#define MPM_NAME "Worker" + +#define AP_MPM_NEEDS_RECLAIM_CHILD_PROCESSES 1 +#define MPM_SYNC_CHILD_TABLE() (ap_sync_scoreboard_image()) +#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid) +#define MPM_NOTE_CHILD_KILLED(i) (MPM_CHILD_PID(i) = 0) + +extern int ap_threads_per_child; +extern int ap_max_daemons_limit; +extern server_rec *ap_server_conf; +extern char ap_coredump_dir[MAX_STRING_LEN]; + +#endif /* APACHE_MPM_WORKER_H */ diff --git a/server/mpm/worker/mpm_default.h b/server/mpm/worker/mpm_default.h new file mode 100644 index 00000000000..84c1304bfa8 --- /dev/null +++ b/server/mpm/worker/mpm_default.h @@ -0,0 +1,154 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000-2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * . + * + * Portions of this software are based upon public domain software + * originally written at the National Center for Supercomputing Applications, + * University of Illinois, Urbana-Champaign. + */ + +#ifndef APACHE_MPM_DEFAULT_H +#define APACHE_MPM_DEFAULT_H + +#define AP_ID_FROM_CHILD_THREAD(c, t) ((c * HARD_THREAD_LIMIT) + t) +#define AP_CHILD_THREAD_FROM_ID(i) (i / HARD_THREAD_LIMIT), (i % HARD_THREAD_LIMIT) + +/* Number of servers to spawn off by default --- also, if fewer than + * this free when the caretaker checks, it will spawn more. + */ +#ifndef DEFAULT_START_DAEMON +#define DEFAULT_START_DAEMON 3 +#endif + +/* Maximum number of *free* server processes --- more than this, and + * they will die off. + */ + +#ifndef DEFAULT_MAX_FREE_DAEMON +#define DEFAULT_MAX_FREE_DAEMON 10 +#endif + +/* Minimum --- fewer than this, and more will be created */ + +#ifndef DEFAULT_MIN_FREE_DAEMON +#define DEFAULT_MIN_FREE_DAEMON 3 +#endif + +/* 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. + */ +#ifdef NO_THREADS +#define HARD_SERVER_LIMIT 256 +#endif +#ifndef HARD_SERVER_LIMIT +#define HARD_SERVER_LIMIT 8 +#endif + +/* Limit on the threads per process. Clients will be locked out if more than + * this * HARD_SERVER_LIMIT are needed. + * + * We keep this for one reason it keeps the size of the scoreboard file small + * enough that we can read the whole thing without worrying too much about + * the overhead. + */ +#ifdef NO_THREADS +#define HARD_THREAD_LIMIT 1 +#endif +#ifndef HARD_THREAD_LIMIT +#define HARD_THREAD_LIMIT 64 +#endif + +#ifdef NO_THREADS +#define DEFAULT_THREADS_PER_CHILD 1 +#endif +#ifndef DEFAULT_THREADS_PER_CHILD +#define DEFAULT_THREADS_PER_CHILD 25 +#endif + +/* File used for accept locking, when we use a file */ +#ifndef DEFAULT_LOCKFILE +#define DEFAULT_LOCKFILE "logs/accept.lock" +#endif + +/* Scoreboard file, if there is one */ +#ifndef DEFAULT_SCOREBOARD +#define DEFAULT_SCOREBOARD "logs/apache_runtime_status" +#endif + +/* Where the main/parent process's pid is logged */ +#ifndef DEFAULT_PIDLOG +#define DEFAULT_PIDLOG "logs/httpd.pid" +#endif + +/* + * Interval, in microseconds, between scoreboard maintenance. + */ +#ifndef SCOREBOARD_MAINTENANCE_INTERVAL +#define SCOREBOARD_MAINTENANCE_INTERVAL 1000000 +#endif + +/* Number of requests to try to handle in a single process. If <= 0, + * the children don't die off. + */ +#ifndef DEFAULT_MAX_REQUESTS_PER_CHILD +#define DEFAULT_MAX_REQUESTS_PER_CHILD 10000 +#endif + +#endif /* AP_MPM_DEFAULT_H */ diff --git a/server/mpm/worker/worker.c b/server/mpm/worker/worker.c new file mode 100644 index 00000000000..9f969af51c4 --- /dev/null +++ b/server/mpm/worker/worker.c @@ -0,0 +1,1660 @@ +/* ==================================================================== + * The Apache Software License, Version 1.1 + * + * Copyright (c) 2000-2001 The Apache Software Foundation. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. The end-user documentation included with the redistribution, + * if any, must include the following acknowledgment: + * "This product includes software developed by the + * Apache Software Foundation (http://www.apache.org/)." + * Alternately, this acknowledgment may appear in the software itself, + * if and wherever such third-party acknowledgments normally appear. + * + * 4. The names "Apache" and "Apache Software Foundation" must + * not be used to endorse or promote products derived from this + * software without prior written permission. For written + * permission, please contact apache@apache.org. + * + * 5. Products derived from this software may not be called "Apache", + * nor may "Apache" appear in their name, without prior written + * permission of the Apache Software Foundation. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * ==================================================================== + * + * This software consists of voluntary contributions made by many + * individuals on behalf of the Apache Software Foundation. For more + * information on the Apache Software Foundation, please see + * . + * + * Portions of this software are based upon public domain software + * originally written at the National Center for Supercomputing Applications, + * University of Illinois, Urbana-Champaign. + */ + +#include "apr.h" +#include "apr_portable.h" +#include "apr_strings.h" +#include "apr_file_io.h" +#include "apr_thread_proc.h" +#include "apr_signal.h" +#define APR_WANT_STRFUNC +#include "apr_want.h" + +#if APR_HAVE_UNISTD_H +#include +#endif +#if APR_HAVE_SYS_SOCKET_H +#include +#endif +#if APR_HAVE_SYS_WAIT_H +#include +#endif +#ifdef HAVE_SYS_PROCESSOR_H +#include /* for bindprocessor() */ +#endif + +#if !APR_HAS_THREADS +#error The Worker MPM requires APR threads, but they are unavailable. +#endif + +#define CORE_PRIVATE + +#include "ap_config.h" +#include "httpd.h" +#include "http_main.h" +#include "http_log.h" +#include "http_config.h" /* for read_config */ +#include "http_core.h" /* for get_remote_host */ +#include "http_connection.h" +#include "ap_mpm.h" +#include "unixd.h" +#include "mpm_common.h" +#include "ap_listen.h" +#include "scoreboard.h" +#include "fdqueue.h" + +#include +#include /* for INT_MAX */ + +/* + * Actual definitions of config globals + */ + +int ap_threads_per_child=0; /* Worker threads per child */ +static int ap_max_requests_per_child=0; +static const char *ap_pid_fname=NULL; +static int ap_daemons_to_start=0; +static int min_spare_threads=0; +static int max_spare_threads=0; +static int ap_daemons_limit=0; +static int dying = 0; +static int workers_may_exit = 0; +static int requests_this_child; +static int num_listensocks = 0; +static apr_socket_t **listensocks; +static FDQueue *worker_queue; + +/* The structure used to pass unique initialization info to each thread */ +typedef struct { + int pid; + int tid; + int sd; + apr_pool_t *tpool; /* "pthread" would be confusing */ +} proc_info; + +/* Structure used to pass information to the thread responsible for + * creating the rest of the threads. + */ +typedef struct { + apr_thread_t **threads; + int child_num_arg; + apr_threadattr_t *threadattr; +} thread_starter; + +/* + * The max child slot ever assigned, preserved across restarts. Necessary + * to deal with MaxClients changes across SIGWINCH restarts. We use this + * value to optimize routines that have to scan the entire scoreboard. + */ +int ap_max_daemons_limit = -1; + +char ap_coredump_dir[MAX_STRING_LEN]; + +static apr_file_t *pipe_of_death_in = NULL; +static apr_file_t *pipe_of_death_out = NULL; +static apr_lock_t *pipe_of_death_mutex; /* insures that a child process only + consumes one character */ + +/* *Non*-shared http_main globals... */ + +server_rec *ap_server_conf; + +/* one_process --- debugging mode variable; can be set from the command line + * with the -X flag. If set, this gets you the child_main loop running + * in the process which originally started up (no detach, no make_child), + * which is a pretty nice debugging environment. (You'll get a SIGHUP + * early in standalone_main; just continue through. This is the server + * trying to kill off any child processes which it might have lying + * around --- Apache doesn't keep track of their pids, it just sends + * SIGHUP to the process group, ignoring it in the root process. + * Continue through and you'll be fine.). + */ + +static int one_process = 0; + +#ifdef DEBUG_SIGSTOP +int raise_sigstop_flags; +#endif + +static apr_pool_t *pconf; /* Pool for config stuff */ +static apr_pool_t *pchild; /* Pool for httpd child stuff */ + +static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main + thread. Use this instead */ +/* Keep track of the number of worker threads currently active */ +static int worker_thread_count; +static apr_lock_t *worker_thread_count_mutex; + +/* Locks for accept serialization */ +static apr_lock_t *accept_mutex; +static apr_lockmech_e_np accept_lock_mech = APR_LOCK_DEFAULT; +static const char *lock_fname; + +#ifdef NO_SERIALIZED_ACCEPT +#define SAFE_ACCEPT(stmt) APR_SUCCESS +#else +#define SAFE_ACCEPT(stmt) (stmt) +#endif + +AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result) +{ + switch(query_code){ + case AP_MPMQ_MAX_DAEMON_USED: + *result = ap_max_daemons_limit; + return APR_SUCCESS; + case AP_MPMQ_IS_THREADED: + *result = AP_MPMQ_STATIC; + return APR_SUCCESS; + case AP_MPMQ_IS_FORKED: + *result = AP_MPMQ_DYNAMIC; + return APR_SUCCESS; + case AP_MPMQ_HARD_LIMIT_DAEMONS: + *result = HARD_SERVER_LIMIT; + return APR_SUCCESS; + case AP_MPMQ_HARD_LIMIT_THREADS: + *result = HARD_THREAD_LIMIT; + return APR_SUCCESS; + case AP_MPMQ_MAX_THREADS: + *result = ap_threads_per_child; + return APR_SUCCESS; + case AP_MPMQ_MIN_SPARE_DEAMONS: + *result = 0; + return APR_SUCCESS; + case AP_MPMQ_MIN_SPARE_THREADS: + *result = min_spare_threads; + return APR_SUCCESS; + case AP_MPMQ_MAX_SPARE_DAEMONS: + *result = 0; + return APR_SUCCESS; + case AP_MPMQ_MAX_SPARE_THREADS: + *result = max_spare_threads; + return APR_SUCCESS; + case AP_MPMQ_MAX_REQUESTS_DEAMON: + *result = ap_max_requests_per_child; + return APR_SUCCESS; + case AP_MPMQ_MAX_DAEMONS: + *result = ap_daemons_limit; + return APR_SUCCESS; + } + return APR_ENOTIMPL; +} + +/* a clean exit from a child with proper cleanup */ +static void clean_child_exit(int code) __attribute__ ((noreturn)); +static void clean_child_exit(int code) +{ + if (pchild) { + apr_pool_destroy(pchild); + } + exit(code); +} + +/* handle all varieties of core dumping signals */ +static void sig_coredump(int sig) +{ + chdir(ap_coredump_dir); + apr_signal(sig, SIG_DFL); + kill(ap_my_pid, sig); + /* At this point we've got sig blocked, because we're still inside + * the signal handler. When we leave the signal handler it will + * be unblocked, and we'll take the signal... and coredump or whatever + * is appropriate for this particular Unix. In addition the parent + * will see the real signal we received -- whereas if we called + * abort() here, the parent would only see SIGABRT. + */ +} + +static void just_die(int sig) +{ + clean_child_exit(0); +} + +/***************************************************************** + * Connection structures and accounting... + */ + +/* volatile just in case */ +static int volatile shutdown_pending; +static int volatile restart_pending; +static int volatile is_graceful; +ap_generation_t volatile ap_my_generation; + +/* + * ap_start_shutdown() and ap_start_restart(), below, are a first stab at + * functions to initiate shutdown or restart without relying on signals. + * Previously this was initiated in sig_term() and restart() signal handlers, + * but we want to be able to start a shutdown/restart from other sources -- + * e.g. on Win32, from the service manager. Now the service manager can + * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that + * these functions can also be called by the child processes, since global + * variables are no longer used to pass on the required action to the parent. + * + * These should only be called from the parent process itself, since the + * parent process will use the shutdown_pending and restart_pending variables + * to determine whether to shutdown or restart. The child process should + * call signal_parent() directly to tell the parent to die -- this will + * cause neither of those variable to be set, which the parent will + * assume means something serious is wrong (which it will be, for the + * child to force an exit) and so do an exit anyway. + */ + +static void ap_start_shutdown(void) +{ + if (shutdown_pending == 1) { + /* Um, is this _probably_ not an error, if the user has + * tried to do a shutdown twice quickly, so we won't + * worry about reporting it. + */ + return; + } + shutdown_pending = 1; +} + +/* do a graceful restart if graceful == 1 */ +static void ap_start_restart(int graceful) +{ + + if (restart_pending == 1) { + /* Probably not an error - don't bother reporting it */ + return; + } + restart_pending = 1; + is_graceful = graceful; + if (is_graceful) { + apr_pool_cleanup_kill(pconf, NULL, ap_cleanup_scoreboard); + } +} + +static void sig_term(int sig) +{ + ap_start_shutdown(); +} + +static void restart(int sig) +{ + ap_start_restart(sig == SIGWINCH); +} + +static void set_signals(void) +{ +#ifndef NO_USE_SIGACTION + struct sigaction sa; + + sigemptyset(&sa.sa_mask); + sa.sa_flags = 0; + + if (!one_process) { + sa.sa_handler = sig_coredump; +#if defined(SA_ONESHOT) + sa.sa_flags = SA_ONESHOT; +#elif defined(SA_RESETHAND) + sa.sa_flags = SA_RESETHAND; +#endif + if (sigaction(SIGSEGV, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)"); +#ifdef SIGBUS + if (sigaction(SIGBUS, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)"); +#endif +#ifdef SIGABORT + if (sigaction(SIGABORT, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)"); +#endif +#ifdef SIGABRT + if (sigaction(SIGABRT, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)"); +#endif +#ifdef SIGILL + if (sigaction(SIGILL, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)"); +#endif + sa.sa_flags = 0; + } + sa.sa_handler = sig_term; + if (sigaction(SIGTERM, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)"); +#ifdef SIGINT + if (sigaction(SIGINT, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)"); +#endif +#ifdef SIGXCPU + sa.sa_handler = SIG_DFL; + if (sigaction(SIGXCPU, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)"); +#endif +#ifdef SIGXFSZ + sa.sa_handler = SIG_DFL; + if (sigaction(SIGXFSZ, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)"); +#endif +#ifdef SIGPIPE + sa.sa_handler = SIG_IGN; + if (sigaction(SIGPIPE, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)"); +#endif + + /* we want to ignore HUPs and WINCH while we're busy processing one */ + sigaddset(&sa.sa_mask, SIGHUP); + sigaddset(&sa.sa_mask, SIGWINCH); + sa.sa_handler = restart; + if (sigaction(SIGHUP, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)"); + if (sigaction(SIGWINCH, &sa, NULL) < 0) + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)"); +#else + if (!one_process) { + apr_signal(SIGSEGV, sig_coredump); +#ifdef SIGBUS + apr_signal(SIGBUS, sig_coredump); +#endif /* SIGBUS */ +#ifdef SIGABORT + apr_signal(SIGABORT, sig_coredump); +#endif /* SIGABORT */ +#ifdef SIGABRT + apr_signal(SIGABRT, sig_coredump); +#endif /* SIGABRT */ +#ifdef SIGILL + apr_signal(SIGILL, sig_coredump); +#endif /* SIGILL */ +#ifdef SIGXCPU + apr_signal(SIGXCPU, SIG_DFL); +#endif /* SIGXCPU */ +#ifdef SIGXFSZ + apr_signal(SIGXFSZ, SIG_DFL); +#endif /* SIGXFSZ */ + } + + apr_signal(SIGTERM, sig_term); +#ifdef SIGHUP + apr_signal(SIGHUP, restart); +#endif /* SIGHUP */ +#ifdef SIGWINCH + apr_signal(SIGWINCH, restart); +#endif /* SIGWINCH */ +#ifdef SIGPIPE + apr_signal(SIGPIPE, SIG_IGN); +#endif /* SIGPIPE */ + +#endif +} + +/***************************************************************** + * Here follows a long bunch of generic server bookkeeping stuff... + */ + +int ap_graceful_stop_signalled(void) +{ + /* XXX - Does this really work? - Manoj */ + return is_graceful; +} + +/***************************************************************** + * Child process main loop. + */ + +static void process_socket(apr_pool_t *p, apr_socket_t *sock, int my_child_num, int my_thread_num) +{ + conn_rec *current_conn; + long conn_id = AP_ID_FROM_CHILD_THREAD(my_child_num, my_thread_num); + int csd; + + (void) apr_os_sock_get(&csd, sock); + + if (csd >= FD_SETSIZE) { + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL, + "new file descriptor %d is too large; you probably need " + "to rebuild Apache with a larger FD_SETSIZE " + "(currently %d)", + csd, FD_SETSIZE); + apr_socket_close(sock); + return; + } + + ap_sock_disable_nagle(sock); + + current_conn = ap_new_connection(p, ap_server_conf, sock, conn_id); + if (current_conn) { + ap_process_connection(current_conn); + ap_lingering_close(current_conn); + } +} + +/* requests_this_child has gone to zero or below. See if the admin coded + "MaxRequestsPerChild 0", and keep going in that case. Doing it this way + simplifies the hot path in worker_thread */ + +static void check_infinite_requests(void) +{ + if (ap_max_requests_per_child) { + workers_may_exit = 1; + } + else { + /* wow! if you're executing this code, you may have set a record. + * either this child process has served over 2 billion requests, or + * you're running a threaded 2.0 on a 16 bit machine. + * + * I'll buy pizza and beers at Apachecon for the first person to do + * the former without cheating (dorking with INT_MAX, or running with + * uncommitted performance patches, for example). + * + * for the latter case, you probably deserve a beer too. Greg Ames + */ + + requests_this_child = INT_MAX; /* keep going */ + } +} + +/* Sets workers_may_exit if we received a character on the pipe_of_death */ +static void check_pipe_of_death(void) +{ + apr_lock_acquire(pipe_of_death_mutex); + if (!workers_may_exit) { + apr_status_t ret; + char pipe_read_char; + apr_size_t n = 1; + + ret = apr_recv(listensocks[0], &pipe_read_char, &n); + if (APR_STATUS_IS_EAGAIN(ret)) { + /* It lost the lottery. It must continue to suffer + * through a life of servitude. */ + } + else { + /* It won the lottery (or something else is very + * wrong). Embrace death with open arms. */ + workers_may_exit = 1; + } + } + apr_lock_release(pipe_of_death_mutex); +} + +static void *listener_thread(apr_thread_t *thd, void * dummy) +{ + proc_info * ti = dummy; + int process_slot = ti->pid; + int thread_slot = ti->tid; + apr_pool_t *tpool = ti->tpool; + apr_socket_t *csd = NULL; + apr_pool_t *ptrans; /* Pool for per-transaction stuff */ + apr_socket_t *sd = NULL; + int n; + int curr_pollfd, last_pollfd = 0; + apr_pollfd_t *pollset; + apr_status_t rv; + + free(ti); + + apr_pool_create(&ptrans, tpool); + + apr_lock_acquire(worker_thread_count_mutex); + worker_thread_count++; + apr_lock_release(worker_thread_count_mutex); + + apr_poll_setup(&pollset, num_listensocks+1, tpool); + for(n=0 ; n <= num_listensocks ; ++n) + apr_poll_socket_add(pollset, listensocks[n], APR_POLLIN); + + worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue)); + ap_queue_init(worker_queue, ap_threads_per_child, pchild); + + /* TODO: Switch to a system where threads reuse the results from earlier + poll calls - manoj */ + while (1) { + if (requests_this_child <= 0) { + check_infinite_requests(); + } + if (workers_may_exit) break; + + if ((rv = SAFE_ACCEPT(apr_lock_acquire(accept_mutex))) + != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, + "apr_lock_acquire failed. Attempting to shutdown " + "process gracefully."); + workers_may_exit = 1; + } + + while (!workers_may_exit) { + apr_status_t ret; + apr_int16_t event; + + ret = apr_poll(pollset, &n, -1); + if (ret != APR_SUCCESS) { + if (APR_STATUS_IS_EINTR(ret)) { + continue; + } + + /* apr_poll() will only return errors in catastrophic + * circumstances. Let's try exiting gracefully, for now. */ + ap_log_error(APLOG_MARK, APLOG_ERR, ret, (const server_rec *) + ap_server_conf, "apr_poll: (listen)"); + workers_may_exit = 1; + } + + if (workers_may_exit) break; + + apr_poll_revents_get(&event, listensocks[0], pollset); + if (event & APR_POLLIN) { + /* A process got a signal on the shutdown pipe. Check if we're + * the lucky process to die. */ + check_pipe_of_death(); + continue; + } + + if (num_listensocks == 1) { + sd = ap_listeners->sd; + goto got_fd; + } + else { + /* find a listener */ + curr_pollfd = last_pollfd; + do { + curr_pollfd++; + if (curr_pollfd > num_listensocks) { + curr_pollfd = 1; + } + /* XXX: Should we check for POLLERR? */ + apr_poll_revents_get(&event, listensocks[curr_pollfd], pollset); + if (event & APR_POLLIN) { + last_pollfd = curr_pollfd; + sd=listensocks[curr_pollfd]; + goto got_fd; + } + } while (curr_pollfd != last_pollfd); + } + } + got_fd: + if (!workers_may_exit) { + if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) { + csd = NULL; + ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, + "apr_accept"); + } + if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex))) + != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, + "apr_lock_release failed. Attempting to shutdown " + "process gracefully."); + workers_may_exit = 1; + } + if (csd != NULL) { + ap_queue_push(worker_queue, csd, ptrans); + ap_block_on_queue(worker_queue); + } + } + else { + if ((rv = SAFE_ACCEPT(apr_lock_release(accept_mutex))) + != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, + "apr_lock_release failed. Attempting to shutdown " + "process gracefully."); + workers_may_exit = 1; + } + break; + } + } + + apr_pool_destroy(tpool); + ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL, + (request_rec *) NULL); + dying = 1; + apr_lock_acquire(worker_thread_count_mutex); + worker_thread_count--; + if (worker_thread_count == 0) { + /* All the threads have exited, now finish the shutdown process + * by signalling the sigwait thread */ + kill(ap_my_pid, SIGTERM); + } + apr_lock_release(worker_thread_count_mutex); + + return NULL; +} + +static void *worker_thread(apr_thread_t *thd, void * dummy) +{ + proc_info * ti = dummy; + int process_slot = ti->pid; + int thread_slot = ti->tid; + apr_pool_t *tpool = ti->tpool; + apr_socket_t *csd = NULL; + apr_pool_t *ptrans; /* Pool for per-transaction stuff */ + apr_socket_t *sd = NULL; + int n; + int curr_pollfd, last_pollfd = 0; + apr_pollfd_t *pollset; + apr_status_t rv; + + free(ti); + + while (!workers_may_exit) { + ap_queue_pop(worker_queue, &csd, &ptrans, 1); + process_socket(ptrans, csd, process_slot, thread_slot); + requests_this_child--; + apr_pool_clear(ptrans); + } + + apr_pool_destroy(tpool); + ap_update_child_status(process_slot, thread_slot, (dying) ? SERVER_DEAD : SERVER_GRACEFUL, + (request_rec *) NULL); + apr_lock_acquire(worker_thread_count_mutex); + if (!dying) { + /* this is the first thread to exit */ + if (ap_my_pid == ap_scoreboard_image->parent[process_slot].pid) { + /* tell the parent that it may use this scoreboard slot */ + ap_scoreboard_image->parent[process_slot].quiescing = 1; + } + dying = 1; + } + worker_thread_count--; + if (worker_thread_count == 0) { + /* All the threads have exited, now finish the shutdown process + * by signalling the sigwait thread */ + kill(ap_my_pid, SIGTERM); + } + apr_lock_release(worker_thread_count_mutex); + + return NULL; +} + +static int check_signal(int signum) +{ + switch (signum) { + case SIGTERM: + case SIGINT: + return 1; + } + return 0; +} + +static void *start_threads(apr_thread_t *thd, void * dummy) +{ + thread_starter *ts = dummy; + apr_thread_t **threads = ts->threads; + apr_threadattr_t *thread_attr = ts->threadattr; + int child_num_arg = ts->child_num_arg; + int i; + int my_child_num = child_num_arg; + proc_info *my_info = NULL; + apr_status_t rv; + int threads_created = 0; + apr_thread_t *listener; + + while (1) { + my_info = (proc_info *)malloc(sizeof(proc_info)); + my_info->pid = my_child_num; + my_info->tid = i; + my_info->sd = 0; + apr_pool_create(&my_info->tpool, pchild); + apr_thread_create(&listener, thread_attr, listener_thread, my_info, pchild); + for (i=0; i < ap_threads_per_child; i++) { + int status = ap_scoreboard_image->servers[child_num_arg][i].status; + + if (status != SERVER_GRACEFUL && status != SERVER_DEAD) { + continue; + } + + my_info = (proc_info *)malloc(sizeof(proc_info)); + if (my_info == NULL) { + ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, + "malloc: out of memory"); + clean_child_exit(APEXIT_CHILDFATAL); + } + my_info->pid = my_child_num; + my_info->tid = i; + my_info->sd = 0; + apr_pool_create(&my_info->tpool, pchild); + + /* We are creating threads right now */ + (void) ap_update_child_status(my_child_num, i, SERVER_STARTING, + (request_rec *) NULL); + /* We let each thread update its own scoreboard entry. This is + * done because it lets us deal with tid better. + */ + if ((rv = apr_thread_create(&threads[i], thread_attr, worker_thread, my_info, pchild))) { + ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, + "apr_thread_create: unable to create worker thread"); + /* In case system resources are maxxed out, we don't want + Apache running away with the CPU trying to fork over and + over and over again if we exit. */ + sleep(10); + clean_child_exit(APEXIT_CHILDFATAL); + } + threads_created++; + } + if (workers_may_exit || threads_created == ap_threads_per_child) { + break; + } + sleep(1); /* wait for previous generation to clean up an entry */ + } + + /* What state should this child_main process be listed as in the scoreboard...? + * ap_update_child_status(my_child_num, i, SERVER_STARTING, (request_rec *) NULL); + * + * This state should be listed separately in the scoreboard, in some kind + * of process_status, not mixed in with the worker threads' status. + * "life_status" is almost right, but it's in the worker's structure, and + * the name could be clearer. gla + */ + return NULL; +} + +static void child_main(int child_num_arg) +{ + apr_thread_t **threads; + int i; + ap_listen_rec *lr; + apr_status_t rv; + thread_starter *ts; + apr_threadattr_t *thread_attr; + apr_thread_t *start_thread_id; + + ap_my_pid = getpid(); + apr_pool_create(&pchild, pconf); + + /*stuff to do before we switch id's, so we have permissions.*/ + reopen_scoreboard(pchild); + + rv = SAFE_ACCEPT(apr_lock_child_init(&accept_mutex, lock_fname, + pchild)); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, + "Couldn't initialize cross-process lock in child"); + clean_child_exit(APEXIT_CHILDFATAL); + } + + if (unixd_setup_child()) { + clean_child_exit(APEXIT_CHILDFATAL); + } + + ap_run_child_init(pchild, ap_server_conf); + + /*done with init critical section */ + + rv = apr_setup_signal_thread(); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, + "Couldn't initialize signal thread"); + clean_child_exit(APEXIT_CHILDFATAL); + } + + if (ap_max_requests_per_child) { + requests_this_child = ap_max_requests_per_child; + } + else { + /* coding a value of zero means infinity */ + requests_this_child = INT_MAX; + } + + /* Set up the pollfd array */ + listensocks = apr_pcalloc(pchild, + sizeof(*listensocks) * (num_listensocks + 1)); +#if APR_FILES_AS_SOCKETS + apr_socket_from_file(&listensocks[0], pipe_of_death_in); +#endif + for (lr = ap_listeners, i = 1; i <= num_listensocks; lr = lr->next, ++i) + listensocks[i]=lr->sd; + + /* Setup worker threads */ + + /* clear the storage; we may not create all our threads immediately, and we want + * a 0 entry to indicate a thread which was not created + */ + threads = (apr_thread_t **)calloc(1, sizeof(apr_thread_t *) * ap_threads_per_child); + if (threads == NULL) { + ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, + "malloc: out of memory"); + clean_child_exit(APEXIT_CHILDFATAL); + } + worker_thread_count = 0; + apr_lock_create(&worker_thread_count_mutex, APR_MUTEX, APR_INTRAPROCESS, + NULL, pchild); + apr_lock_create(&pipe_of_death_mutex, APR_MUTEX, APR_INTRAPROCESS, + NULL, pchild); + + ts = apr_palloc(pchild, sizeof(*ts)); + + apr_threadattr_create(&thread_attr, pchild); + apr_threadattr_detach_set(thread_attr, 0); /* 0 means PTHREAD_CREATE_JOINABLE */ + + ts->threads = threads; + ts->child_num_arg = child_num_arg; + ts->threadattr = thread_attr; + + if ((rv = apr_thread_create(&start_thread_id, thread_attr, start_threads, ts, pchild))) { + ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, + "apr_thread_create: unable to create worker thread"); + /* In case system resources are maxxed out, we don't want + Apache running away with the CPU trying to fork over and + over and over again if we exit. */ + sleep(10); + clean_child_exit(APEXIT_CHILDFATAL); + } + + apr_signal_thread(check_signal); + + workers_may_exit = 1; /* helps us terminate a little more quickly when + * the dispatch of the signal thread + * beats the Pipe of Death and the browsers + */ + + /* A terminating signal was received. Now join each of the workers to clean them up. + * If the worker already exited, then the join frees their resources and returns. + * If the worker hasn't exited, then this blocks until they have (then cleans up). + */ + apr_thread_join(&rv, start_thread_id); + for (i = 0; i < ap_threads_per_child; i++) { + if (threads[i]) { /* if we ever created this thread */ + apr_thread_join(&rv, threads[i]); + } + } + + free(threads); + + clean_child_exit(0); +} + +static int make_child(server_rec *s, int slot) +{ + int pid; + + if (slot + 1 > ap_max_daemons_limit) { + ap_max_daemons_limit = slot + 1; + } + + if (one_process) { + set_signals(); + ap_scoreboard_image->parent[slot].pid = getpid(); + child_main(slot); + } + + if ((pid = fork()) == -1) { + ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process"); + + /* fork didn't succeed. Fix the scoreboard or else + * it will say SERVER_STARTING forever and ever + */ + (void) ap_update_child_status(slot, 0, SERVER_DEAD, (request_rec *) NULL); + + /* In case system resources are maxxed out, we don't want + Apache running away with the CPU trying to fork over and + over and over again. */ + sleep(10); + + return -1; + } + + if (!pid) { +#ifdef HAVE_BINDPROCESSOR + /* By default, AIX binds to a single processor. This bit unbinds + * children which will then bind to another CPU. + */ + int status = bindprocessor(BINDPROCESS, (int)getpid(), + PROCESSOR_CLASS_ANY); + if (status != OK) + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno, ap_server_conf, + "processor unbind failed %d", status); +#endif + RAISE_SIGSTOP(MAKE_CHILD); + + apr_signal(SIGTERM, just_die); + child_main(slot); + + clean_child_exit(0); + } + /* else */ + ap_scoreboard_image->parent[slot].quiescing = 0; + ap_scoreboard_image->parent[slot].pid = pid; + return 0; +} + +/* If there aren't many connections coming in from the network, the child + * processes may need to be awakened from their network i/o waits. + * The pipe of death is an effective prod. + */ + +static void wake_up_and_die(void) +{ + int i; + char char_of_death = '!'; + apr_size_t one = 1; + apr_status_t rv; + + for (i = 0; i < ap_daemons_limit;) { + if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one)) + != APR_SUCCESS) { + if (APR_STATUS_IS_EINTR(rv)) continue; + ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, + "write pipe_of_death"); + } + i++; + } +} + +/* start up a bunch of children */ +static void startup_children(int number_to_start) +{ + int i; + + for (i = 0; number_to_start && i < ap_daemons_limit; ++i) { + if (ap_scoreboard_image->parent[i].pid != 0) { + continue; + } + if (make_child(ap_server_conf, i) < 0) { + break; + } + --number_to_start; + } +} + + +/* + * idle_spawn_rate is the number of children that will be spawned on the + * next maintenance cycle if there aren't enough idle servers. It is + * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by + * without the need to spawn. + */ +static int idle_spawn_rate = 1; +#ifndef MAX_SPAWN_RATE +#define MAX_SPAWN_RATE (32) +#endif +static int hold_off_on_exponential_spawning; + +static void perform_idle_server_maintenance(void) +{ + int i, j; + int idle_thread_count; + worker_score *ws; + process_score *ps; + int free_length; + int free_slots[MAX_SPAWN_RATE]; + int last_non_dead; + int total_non_dead; + apr_size_t one = 1; + apr_status_t rv; + + /* initialize the free_list */ + free_length = 0; + + idle_thread_count = 0; + last_non_dead = -1; + total_non_dead = 0; + + ap_sync_scoreboard_image(); + for (i = 0; i < ap_daemons_limit; ++i) { + /* Initialization to satisfy the compiler. It doesn't know + * that ap_threads_per_child is always > 0 */ + int status = SERVER_DEAD; + int any_dying_threads = 0; + int any_dead_threads = 0; + + if (i >= ap_max_daemons_limit && free_length == idle_spawn_rate) + break; + ps = &ap_scoreboard_image->parent[i]; + for (j = 0; j < ap_threads_per_child; j++) { + ws = &ap_scoreboard_image->servers[i][j]; + status = ws->status; + + any_dying_threads = any_dying_threads || (status == SERVER_GRACEFUL); + any_dead_threads = any_dead_threads || (status == SERVER_DEAD); + + /* We consider a starting server as idle because we started it + * at least a cycle ago, and if it still hasn't finished starting + * then we're just going to swamp things worse by forking more. + * So we hopefully won't need to fork more if we count it. + * This depends on the ordering of SERVER_READY and SERVER_STARTING. + */ + if (status <= SERVER_READY && status != SERVER_DEAD && + ps->generation == ap_my_generation && + /* XXX the following shouldn't be necessary if we clean up + * properly after seg faults, but we're not yet GLA + */ + ps->pid != 0) { + ++idle_thread_count; + } + } + /* XXX any_dead_threads may not be needed any more GLA */ + if (any_dead_threads && free_length < idle_spawn_rate + && (!ps->pid /* no process in the slot */ + || ps->quiescing)) { /* or at least one is going away */ + free_slots[free_length] = i; + ++free_length; + } + if (!any_dying_threads) { + last_non_dead = i; + ++total_non_dead; + } + } + ap_max_daemons_limit = last_non_dead + 1; + + if (idle_thread_count > max_spare_threads) { + char char_of_death = '!'; + /* Kill off one child */ + if ((rv = apr_file_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, "write pipe_of_death"); + } + idle_spawn_rate = 1; + } + else if (idle_thread_count < min_spare_threads) { + /* terminate the free list */ + if (free_length == 0) { + /* only report this condition once */ + static int reported = 0; + + if (!reported) { + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf, + "server reached MaxClients setting, consider" + " raising the MaxClients setting"); + reported = 1; + } + idle_spawn_rate = 1; + } + else { + + if (idle_spawn_rate >= 8) { + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf, + "server seems busy, (you may need " + "to increase StartServers, ThreadsPerChild " + "or Min/MaxSpareThreads), " + "spawning %d children, there are around %d idle " + "threads, and %d total children", free_length, + idle_thread_count, total_non_dead); + } + for (i = 0; i < free_length; ++i) { + make_child(ap_server_conf, free_slots[i]); + } + /* the next time around we want to spawn twice as many if this + * wasn't good enough, but not if we've just done a graceful + */ + if (hold_off_on_exponential_spawning) { + --hold_off_on_exponential_spawning; + } + else if (idle_spawn_rate < MAX_SPAWN_RATE) { + idle_spawn_rate *= 2; + } + } + } + else { + idle_spawn_rate = 1; + } +} + +static void server_main_loop(int remaining_children_to_start) +{ + int child_slot; + apr_wait_t status; + apr_proc_t pid; + int i; + + while (!restart_pending && !shutdown_pending) { + ap_wait_or_timeout(&status, &pid, pconf); + + if (pid.pid != -1) { + ap_process_child_status(&pid, status); + /* non-fatal death... note that it's gone in the scoreboard. */ + child_slot = find_child_by_pid(&pid); + if (child_slot >= 0) { + for (i = 0; i < ap_threads_per_child; i++) + ap_update_child_status(child_slot, i, SERVER_DEAD, (request_rec *) NULL); + + ap_scoreboard_image->parent[child_slot].pid = 0; + ap_scoreboard_image->parent[child_slot].quiescing = 0; + if (remaining_children_to_start + && child_slot < ap_daemons_limit) { + /* we're still doing a 1-for-1 replacement of dead + * children with new children + */ + make_child(ap_server_conf, child_slot); + --remaining_children_to_start; + } +#if APR_HAS_OTHER_CHILD + } + else if (apr_proc_other_child_read(&pid, status) == 0) { + /* handled */ +#endif + } + else if (is_graceful) { + /* Great, we've probably just lost a slot in the + * scoreboard. Somehow we don't know about this child. + */ + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, + ap_server_conf, + "long lost child came home! (pid %ld)", + (long)pid.pid); + } + /* Don't perform idle maintenance when a child dies, + * only do it when there's a timeout. Remember only a + * finite number of children can die, and it's pretty + * pathological for a lot to die suddenly. + */ + continue; + } + else if (remaining_children_to_start) { + /* we hit a 1 second timeout in which none of the previous + * generation of children needed to be reaped... so assume + * they're all done, and pick up the slack if any is left. + */ + startup_children(remaining_children_to_start); + remaining_children_to_start = 0; + /* In any event we really shouldn't do the code below because + * few of the servers we just started are in the IDLE state + * yet, so we'd mistakenly create an extra server. + */ + continue; + } + + perform_idle_server_maintenance(); + } +} + +int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s) +{ + int remaining_children_to_start; + apr_status_t rv; + + pconf = _pconf; + ap_server_conf = s; + + rv = apr_file_pipe_create(&pipe_of_death_in, &pipe_of_death_out, pconf); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, + (const server_rec*) ap_server_conf, + "apr_file_pipe_create (pipe_of_death)"); + exit(1); + } + + if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_ERR, rv, + (const server_rec*) ap_server_conf, + "apr_file_pipe_timeout_set (pipe_of_death)"); + exit(1); + } + + if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) { + /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */ + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s, + "no listening sockets available, shutting down"); + return 1; + } + ap_log_pid(pconf, ap_pid_fname); + + /* Initialize cross-process accept lock */ + lock_fname = apr_psprintf(_pconf, "%s.%" APR_OS_PROC_T_FMT, + ap_server_root_relative(_pconf, lock_fname), + ap_my_pid); + rv = apr_lock_create_np(&accept_mutex, APR_MUTEX, APR_LOCKALL, + accept_lock_mech, lock_fname, _pconf); + if (rv != APR_SUCCESS) { + ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, + "Couldn't create accept lock"); + return 1; + } + + if (!is_graceful) { + ap_run_pre_mpm(pconf, SB_SHARED); + } + + set_signals(); + /* Don't thrash... */ + if (max_spare_threads < min_spare_threads + ap_threads_per_child) + max_spare_threads = min_spare_threads + ap_threads_per_child; + + /* If we're doing a graceful_restart then we're going to see a lot + * of children exiting immediately when we get into the main loop + * below (because we just sent them SIGWINCH). This happens pretty + * rapidly... and for each one that exits we'll start a new one until + * we reach at least daemons_min_free. But we may be permitted to + * start more than that, so we'll just keep track of how many we're + * supposed to start up without the 1 second penalty between each fork. + */ + remaining_children_to_start = ap_daemons_to_start; + if (remaining_children_to_start > ap_daemons_limit) { + remaining_children_to_start = ap_daemons_limit; + } + if (!is_graceful) { + startup_children(remaining_children_to_start); + remaining_children_to_start = 0; + } + else { + /* give the system some time to recover before kicking into + * exponential mode */ + hold_off_on_exponential_spawning = 10; + } + + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, + "%s configured -- resuming normal operations", + ap_get_server_version()); + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf, + "Server built: %s", ap_get_server_built()); + restart_pending = shutdown_pending = 0; + + server_main_loop(remaining_children_to_start); + + if (shutdown_pending) { + /* Time to gracefully shut down: + * Kill child processes, tell them to call child_exit, etc... + */ + wake_up_and_die(); + + if (unixd_killpg(getpgrp(), SIGTERM) < 0) { + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM"); + } + ap_reclaim_child_processes(1); /* Start with SIGTERM */ + + /* cleanup pid file on normal shutdown */ + { + const char *pidfile = NULL; + pidfile = ap_server_root_relative (pconf, ap_pid_fname); + if ( pidfile != NULL && unlink(pidfile) == 0) + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, + ap_server_conf, + "removed PID file %s (pid=%ld)", + pidfile, (long)getpid()); + } + + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, + "caught SIGTERM, shutting down"); + + return 1; + } + + /* we've been told to restart */ + apr_signal(SIGHUP, SIG_IGN); + + if (one_process) { + /* not worth thinking about */ + return 1; + } + + /* advance to the next generation */ + /* XXX: we really need to make sure this new generation number isn't in + * use by any of the children. + */ + ++ap_my_generation; + ap_scoreboard_image->global.running_generation = ap_my_generation; + update_scoreboard_global(); + + /* wake up the children...time to die. But we'll have more soon */ + wake_up_and_die(); + + if (is_graceful) { + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, + "SIGWINCH received. Doing graceful restart"); + + /* This is mostly for debugging... so that we know what is still + * gracefully dealing with existing request. + */ + + } + else { + /* Kill 'em all. Since the child acts the same on the parents SIGTERM + * and a SIGHUP, we may as well use the same signal, because some user + * pthreads are stealing signals from us left and right. + */ + if (unixd_killpg(getpgrp(), SIGTERM) < 0) { + ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM"); + } + ap_reclaim_child_processes(1); /* Start with SIGTERM */ + ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf, + "SIGHUP received. Attempting to restart"); + } + return 0; +} + +static void worker_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp) +{ + static int restart_num = 0; + int no_detach = 0; + + one_process = !!ap_exists_config_define("ONE_PROCESS"); + no_detach = !!ap_exists_config_define("NO_DETACH"); + + /* sigh, want this only the second time around */ + if (restart_num++ == 1) { + is_graceful = 0; + + if (!one_process && !no_detach) { + apr_proc_detach(); + } + ap_my_pid = getpid(); + } + + unixd_pre_config(ptemp); + ap_listen_pre_config(); + ap_daemons_to_start = DEFAULT_START_DAEMON; + min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD; + max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD; + ap_daemons_limit = HARD_SERVER_LIMIT; + ap_threads_per_child = DEFAULT_THREADS_PER_CHILD; + ap_pid_fname = DEFAULT_PIDLOG; + ap_scoreboard_fname = DEFAULT_SCOREBOARD; + lock_fname = DEFAULT_LOCKFILE; + ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD; + ap_extended_status = 0; + + apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir)); +} + +static void worker_hooks(apr_pool_t *p) +{ + one_process = 0; + + ap_hook_pre_config(worker_pre_config, NULL, NULL, APR_HOOK_MIDDLE); +} + + +static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + if (cmd->server->is_virtual) { + return "PidFile directive not allowed in "; + } + ap_pid_fname = arg; + return NULL; +} + +static const char *set_scoreboard(cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + ap_scoreboard_fname = arg; + return NULL; +} + +static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + lock_fname = arg; + return NULL; +} + +static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + ap_daemons_to_start = atoi(arg); + return NULL; +} + +static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + min_spare_threads = atoi(arg); + if (min_spare_threads <= 0) { + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "WARNING: detected MinSpareThreads set to non-positive."); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "Resetting to 1 to avoid almost certain Apache failure."); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "Please read the documentation."); + min_spare_threads = 1; + } + + return NULL; +} + +static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + max_spare_threads = atoi(arg); + return NULL; +} + +static const char *set_server_limit (cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + ap_daemons_limit = atoi(arg); + if (ap_daemons_limit > HARD_SERVER_LIMIT) { + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "WARNING: MaxClients of %d exceeds compile time limit " + "of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + " lowering MaxClients to %d. To increase, please " + "see the", HARD_SERVER_LIMIT); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + " HARD_SERVER_LIMIT define in %s.", + AP_MPM_HARD_LIMITS_FILE); + ap_daemons_limit = HARD_SERVER_LIMIT; + } + else if (ap_daemons_limit < 1) { + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, "WARNING: Require MaxClients > 0, setting to 1"); + ap_daemons_limit = 1; + } + return NULL; +} + +static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + ap_threads_per_child = atoi(arg); + if (ap_threads_per_child > HARD_THREAD_LIMIT) { + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "WARNING: ThreadsPerChild of %d exceeds compile time " + "limit of %d threads,", ap_threads_per_child, + HARD_THREAD_LIMIT); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + " lowering ThreadsPerChild to %d. To increase, please" + " see the", HARD_THREAD_LIMIT); + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + " HARD_THREAD_LIMIT define in %s.", + AP_MPM_HARD_LIMITS_FILE); + ap_threads_per_child = HARD_THREAD_LIMIT; + } + else if (ap_threads_per_child < 1) { + ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL, + "WARNING: Require ThreadsPerChild > 0, setting to 1"); + ap_threads_per_child = 1; + } + return NULL; +} + +static const char *set_max_requests(cmd_parms *cmd, void *dummy, + const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + ap_max_requests_per_child = atoi(arg); + + return NULL; +} + +static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, + const char *arg) +{ + apr_finfo_t finfo; + const char *fname; + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + fname = ap_server_root_relative(cmd->pool, arg); + if ((apr_stat(&finfo, fname, APR_FINFO_TYPE, cmd->pool) != APR_SUCCESS) + || (finfo.filetype != APR_DIR)) { + return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname, + " does not exist or is not a directory", NULL); + } + apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir)); + return NULL; +} + +static const char *set_accept_lock_mech(cmd_parms *cmd, void *dummy, const char *arg) +{ + const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); + if (err != NULL) { + return err; + } + + if (!strcasecmp(arg, "default")) { + accept_lock_mech = APR_LOCK_DEFAULT; + } +#if APR_HAS_FLOCK_SERIALIZE + else if (!strcasecmp(arg, "flock")) { + accept_lock_mech = APR_LOCK_FLOCK; + } +#endif +#if APR_HAS_FCNTL_SERIALIZE + else if (!strcasecmp(arg, "fcntl")) { + accept_lock_mech = APR_LOCK_FCNTL; + } +#endif +#if APR_HAS_SYSVSEM_SERIALIZE + else if (!strcasecmp(arg, "sysvsem")) { + accept_lock_mech = APR_LOCK_SYSVSEM; + } +#endif +#if APR_HAS_PROC_PTHREAD_SERIALIZE + else if (!strcasecmp(arg, "proc_pthread")) { + accept_lock_mech = APR_LOCK_PROC_PTHREAD; + } +#endif + else { + return apr_pstrcat(cmd->pool, arg, " is an invalid mutex mechanism; valid " + "ones for this platform are: default" +#if APR_HAS_FLOCK_SERIALIZE + ", flock" +#endif +#if APR_HAS_FCNTL_SERIALIZE + ", fcntl" +#endif +#if APR_HAS_SYSVSEM_SERIALIZE + ", sysvsem" +#endif +#if APR_HAS_PROC_PTHREAD_SERIALIZE + ", proc_pthread" +#endif + , NULL); + } + return NULL; +} + +static const command_rec worker_cmds[] = { +UNIX_DAEMON_COMMANDS +LISTEN_COMMANDS +AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF, + "A file for logging the server process ID"), +AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, + "A file for Apache to maintain runtime process management information"), +AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF, + "The lockfile used when Apache needs to lock the accept() call"), +AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF, + "Number of child processes launched at server startup"), +AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF, + "Minimum number of idle children, to handle request spikes"), +AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF, + "Maximum number of idle children"), +AP_INIT_TAKE1("MaxClients", set_server_limit, NULL, RSRC_CONF, + "Maximum number of children alive at the same time"), +AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF, + "Number of threads each child creates"), +AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, + "Maximum number of requests a particular child serves before dying."), +AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, + "The location of the directory Apache changes to before dumping core"), +AP_INIT_TAKE1("AcceptMutex", set_accept_lock_mech, NULL, RSRC_CONF, + "The system mutex implementation to use for the accept mutex"), +{ NULL } +}; + +module AP_MODULE_DECLARE_DATA mpm_worker_module = { + MPM20_MODULE_STUFF, + NULL, /* hook to run before apache parses args */ + NULL, /* create per-directory config structure */ + NULL, /* merge per-directory config structures */ + NULL, /* create per-server config structure */ + NULL, /* merge per-server config structures */ + worker_cmds, /* command apr_table_t */ + worker_hooks /* register_hooks */ +}; +