mpmt_beos.c revision 10a4cdd68ef1ca0e54af296fe1d08ac00150c90b
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 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
* 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.
*/
/* This module is effectivly mpmt_pthread much modified to
* allow it work on BeOS. It's stable and works OK.
*/
#define CORE_PRIVATE
#include "apr_strings.h"
#include "apr_portable.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 "beosd.h"
#include "ap_iol.h"
#include "apr_listen.h"
#include "scoreboard.h"
#include "poll.h"
#include "mpm_common.h"
#include "mpm.h"
#include <unistd.h>
/*
* Actual definitions of config globals
*/
int ap_threads_per_child=0; /* Worker threads per child */
int ap_max_requests_per_child=0;
static char *ap_pid_fname=NULL;
static char *ap_scoreboard_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 time_t ap_restart_time=0;
API_VAR_EXPORT int ap_extended_status = 0;
static int workers_may_exit = 0;
static int requests_this_child;
static int num_listenfds = 0;
static int 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;
/* The structure used to pass unique initialization info to each thread */
typedef struct {
int pid;
int sd;
} proc_info;
/*
* 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];
/* shared http_main globals... */
/* one_process */
/* TODO - get this working again... */
static int one_process = 0;
#ifdef DEBUG_SIGSTOP
int raise_sigstop_flags;
#endif
API_EXPORT(int) ap_get_max_daemons(void)
{
return ap_max_daemons_limit;
}
/* a clean exit from a child with proper cleanup
static void clean_child_exit(int code) __attribute__ ((noreturn)); */
void clean_child_exit(int code)
{
if (pchild) {
}
}
/* handle all varieties of core dumping signals */
static void sig_coredump(int 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.
*/
}
{
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_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,
* 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.
*/
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 */
void ap_start_restart(int graceful)
{
if (restart_pending == 1) {
/* Probably not an error - don't bother reporting it */
return;
}
restart_pending = 1;
}
{
}
{
}
static void set_signals(void)
{
if (!one_process) {
}
/* we want to ignore HUPs and WINCH while we're busy processing one */
}
/*****************************************************************
* Here follows a long bunch of generic server bookkeeping stuff...
*/
#define sock_disable_nagle(s) /* NOOP */
int ap_graceful_stop_signalled(void)
{
/* XXX - Does this really work? - Manoj */
return is_graceful;
}
/*****************************************************************
* Child process main loop.
*/
{
int csd;
"filedescriptor (%u) larger than FD_SETSIZE (%u) "
"found, you probably need to rebuild Apache with a "
}
else {
"error attaching to socket");
}
return;
}
conn_id);
}
{
int srv;
int curr_pollfd, last_pollfd = 0;
/* block the signals for this thread */
/* TODO: Switch to a system where threads reuse the results from earlier
poll calls - manoj */
while (!workers_may_exit) {
if (workers_may_exit) break;
while (!workers_may_exit) {
if (srv < 0) {
continue;
}
/* poll() will only return errors in catastrophic
* circumstances. Let's try exiting gracefully, for now. */
ap_server_conf, "poll: (listen)");
workers_may_exit = 1;
}
if (workers_may_exit) break;
if (num_listenfds == 1) {
goto got_fd;
}
else {
/* find a listener */
do {
curr_pollfd++;
if (curr_pollfd > num_listenfds) {
curr_pollfd = 1;
}
/* XXX: Should we check for POLLERR? */
goto got_fd;
}
} while (curr_pollfd != last_pollfd);
}
}
if (!workers_may_exit) {
}
else {
break;
}
}
if (worker_thread_count == 0) {
/* All the threads have exited, now finish the shutdown process
* by signalling the sigwait thread */
}
return (0);
}
{
int child_num_arg = (int) data;
int i;
int my_child_num = child_num_arg;
char buf;
if (beosd_setup_child()) {
}
/*done with init critical section */
/* All threads should mask signals out, accoring to sigwait(2) man page */
/* Set up the pollfd array */
}
/* Setup worker threads */
worker_thread_count = 0;
/* Oh dear, didn't manage to create a worker thread mutex,
so there's no point on going on with this child... */
return (0);
}
for (i=0; i < ap_threads_per_child; i++) {
"malloc: out of memory");
}
/* We are creating threads right now */
"spawn_thread: 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);
}
/* We let each thread update it's own scoreboard entry. This is done
* because it let's us deal with tid better.
*/
}
/* this blocks until it gets a message... */
return (0);
}
{
}
if (one_process) {
set_signals();
}
(void*)slot);
if (tid < B_NO_ERROR) {
"spawn_thread: Unable to fork new process");
/* 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;
}
return 0;
}
/* start up a bunch of children */
static void startup_children(int number_to_start)
{
int i;
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
if (ap_child_table[i].pid) {
continue;
}
if (make_child(ap_server_conf, i, 0) < 0) {
break;
}
}
}
/*
* 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;
/* initialize the free_list */
free_length = 0;
for (i = 0; i < ap_daemons_limit; ++i) {
if (ap_child_table[i].pid == 0) {
if (free_length < spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
}
else {
last_non_dead = i;
}
break;
}
}
if (free_length > 0) {
for (i = 0; i < free_length; ++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
*/
} else if (spawn_rate < MAX_SPAWN_RATE) {
spawn_rate *= 2;
}
} else {
spawn_rate = 1;
}
}
static void server_main_loop(int remaining_children_to_start)
{
int child_slot;
int i;
while (!restart_pending && !shutdown_pending) {
/* non-fatal death... note that it's gone in the scoreboard. */
child_slot = -1;
for (i = 0; i < ap_max_daemons_limit; ++i) {
int j;
child_slot = i;
for (j = 0; j < HARD_THREAD_LIMIT; j++) {
}
break;
}
}
if (child_slot >= 0) {
&& child_slot < ap_daemons_limit) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
}
}
/* 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.
*/
}
/* 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.
*/
/* 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;
}
}
}
{
ap_server_conf = s;
/* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
"no listening sockets available, shutting down");
return 1;
}
/* create the accept_mutex */
/* tsch tsch, can't have more than one thread in the accept loop
at a time so we need to fall on our sword... */
"Couldn't create accept lock");
return 1;
}
if (!is_graceful) {
}
set_signals();
/* Don't thrash... */
/* 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.
*/
}
if (!is_graceful) {
}
else {
/* give the system some time to recover before kicking into
* exponential mode */
}
"%s configured -- resuming normal operations",
"Server built: %s", ap_get_server_built());
restart_pending = shutdown_pending = 0;
if (shutdown_pending) {
/* Time to gracefully shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
"killpg SIGTERM");
}
/* cleanup pid file on normal shutdown */
{
"removed PID file %s (pid=%ld)",
}
"caught SIGTERM, shutting down");
return 1;
}
/* we've been told to restart */
if (one_process) {
/* not worth thinking about */
return 1;
}
if (is_graceful) {
int i;
char char_of_death = '!';
"SIGWINCH received. Doing graceful restart");
/* give the children the signal to die */
for (i = 0; i < ap_daemons_limit;) {
if(ap_child_table[i].pid) {
"write port_of_death");
}
}
i++;
}
}
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.
*/
"killpg SIGTERM");
}
"SIGHUP received. Attempting to restart");
}
if (!is_graceful) {
}
return 0;
}
{
static int restart_num = 0;
int no_detach = 0;
/* sigh, want this only the second time around */
if (restart_num++ == 1) {
is_graceful = 0;
if (!one_process && !no_detach) {
beosd_detach();
}
}
}
static void mpmt_beos_hooks(void)
{
one_process = 0;
}
{
return err;
}
return "PidFile directive not allowed in <VirtualHost>";
}
ap_pid_fname = arg;
return NULL;
}
{
return err;
}
return NULL;
}
{
return err;
}
return NULL;
}
{
return err;
}
if (min_spare_threads <= 0) {
"WARNING: detected MinSpareThreads set to non-positive.");
"Resetting to 1 to avoid almost certain Apache failure.");
"Please read the documentation.");
min_spare_threads = 1;
}
return NULL;
}
{
return err;
}
return NULL;
}
{
return err;
}
if (ap_daemons_limit > HARD_SERVER_LIMIT) {
"WARNING: MaxClients of %d exceeds compile time limit "
" lowering MaxClients to %d. To increase, please "
"see the", HARD_SERVER_LIMIT);
" HARD_SERVER_LIMIT define in %s.",
}
else if (ap_daemons_limit < 1) {
"WARNING: Require MaxClients > 0, setting to 1");
ap_daemons_limit = 1;
}
return NULL;
}
{
return err;
}
if (ap_threads_per_child > HARD_THREAD_LIMIT) {
"WARNING: ThreadsPerChild of %d exceeds compile time"
"limit of %d threads,", ap_threads_per_child,
" lowering ThreadsPerChild to %d. To increase, please"
"see the", HARD_THREAD_LIMIT);
" HARD_THREAD_LIMIT define in %s.",
}
else if (ap_threads_per_child < 1) {
"WARNING: Require ThreadsPerChild > 0, setting to 1");
ap_threads_per_child = 1;
}
return NULL;
}
{
return err;
}
return NULL;
}
core_dir_config *d, int arg)
{
return err;
}
return NULL;
}
{
const char *fname;
return err;
}
" does not exist or is not a directory", NULL);
}
return NULL;
}
static const command_rec mpmt_beos_cmds[] = {
"A file for logging the server process ID"},
"A file for Apache to maintain runtime process management information"},
"Number of child processes launched at server startup" },
"Minimum number of idle children, to handle request spikes" },
"Maximum number of idle children" },
"Maximum number of children alive at the same time" },
"Number of threads each child creates" },
"Maximum number of requests a particular child serves before dying." },
"Whether or not to maintain status information on current connections"},
"The location of the directory Apache changes to before dumping core" },
{ NULL }
};
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 */
mpmt_beos_cmds, /* command apr_table_t */
NULL, /* handlers */
mpmt_beos_hooks /* register_hooks */
};