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cd06de1ce37c053f288ba65e5c101e7be3c1e18c
apache-http-server/server/mpm/mpmt_pthread/mpmt_pthread.c
Ben Hyde cd06de1ce3 Well this was thought provoking. 
Drive out the use of malloc in two places.

In listen.c, using the global process pool instead.  That changes the
API into listen so that a process is passed in rather than the config
pool.  That's all was easy.

The pain is propogating a change into all N of the mpm, they
are all similar but different in their use of listen.c  There
is a lot to dislike about similar but code scattered code.

I changed the N setup_listener routines, they now take only
the server since they can dig the config and global pool
out of there.

Free today: ap_setup_prelinked_modules now takes the process so it
can allocate it's table in the process's pool rathern than use
malloc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83943 13f79535-47bb-0310-9956-ffa450edef68
1999-10-07 20:48:26 +00:00

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/* ====================================================================
* Copyright (c) 1995-1999 The Apache Group. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" 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 names without prior written
* permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP 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 Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
#define CORE_PRIVATE
#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 "unixd.h"
#include "iol_socket.h"
#include "ap_listen.h"
#include "scoreboard.h"
#include "acceptlock.h"
#include <poll.h>
#include <netinet/tcp.h>
#include <pthread.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 struct pollfd *listenfds;
/* The structure used to pass unique initialization info to each thread */
typedef struct {
int pid;
int tid;
int sd;
ap_context_t *tpool; /* "pthread" would be confusing */
} proc_info;
#if 0
#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next != NULL) {stmt;}} while (0)
#else
#define SAFE_ACCEPT(stmt) do {stmt;} while (0)
#endif
/*
* 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.
*/
static int max_daemons_limit = -1;
static char ap_coredump_dir[MAX_STRING_LEN];
static int pipe_of_death[2];
static pthread_mutex_t pipe_of_death_mutex;
/* *Non*-shared http_main globals... */
static server_rec *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
#ifdef HAS_OTHER_CHILD
/* used to maintain list of children which aren't part of the scoreboard */
typedef struct other_child_rec other_child_rec;
struct other_child_rec {
other_child_rec *next;
int pid;
void (*maintenance) (int, void *, ap_wait_t);
void *data;
int write_fd;
};
static other_child_rec *other_children;
#endif
static ap_context_t *pconf; /* Pool for config stuff */
static ap_context_t *pchild; /* Pool for httpd child stuff */
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;
static pthread_mutex_t worker_thread_count_mutex;
/* Global, alas, so http_core can talk to us */
enum server_token_type ap_server_tokens = SrvTk_FULL;
API_EXPORT(const server_rec *) ap_get_server_conf(void)
{
return (server_conf);
}
API_EXPORT(int) ap_get_max_daemons(void)
{
return 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) {
ap_destroy_pool(pchild);
}
exit(code);
}
/*****************************************************************
* dealing with other children
*/
#ifdef HAS_OTHER_CHILD
API_EXPORT(void) ap_register_other_child(int pid,
void (*maintenance) (int reason, void *, ap_wait_t status),
void *data, int write_fd)
{
other_child_rec *ocr;
ocr = ap_palloc(pconf, sizeof(*ocr));
ocr->pid = pid;
ocr->maintenance = maintenance;
ocr->data = data;
ocr->write_fd = write_fd;
ocr->next = other_children;
other_children = ocr;
}
/* note that since this can be called by a maintenance function while we're
* scanning the other_children list, all scanners should protect themself
* by loading ocr->next before calling any maintenance function.
*/
API_EXPORT(void) ap_unregister_other_child(void *data)
{
other_child_rec **pocr, *nocr;
for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
if ((*pocr)->data == data) {
nocr = (*pocr)->next;
(*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
*pocr = nocr;
/* XXX: um, well we've just wasted some space in pconf ? */
return;
}
}
}
/* test to ensure that the write_fds are all still writable, otherwise
* invoke the maintenance functions as appropriate */
static void probe_writable_fds(void)
{
return;
#if 0
fd_set writable_fds;
int fd_max;
other_child_rec *ocr, *nocr;
struct timeval tv;
int rc;
if (other_children == NULL)
return;
fd_max = 0;
FD_ZERO(&writable_fds);
do {
for (ocr = other_children; ocr; ocr = ocr->next) {
if (ocr->write_fd == -1)
continue;
FD_SET(ocr->write_fd, &writable_fds);
if (ocr->write_fd > fd_max) {
fd_max = ocr->write_fd;
}
}
if (fd_max == 0)
return;
tv.tv_sec = 0;
tv.tv_usec = 0;
rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
} while (rc == -1 && errno == EINTR);
if (rc == -1) {
/* XXX: uhh this could be really bad, we could have a bad file
* descriptor due to a bug in one of the maintenance routines */
ap_log_unixerr("probe_writable_fds", "select",
"could not probe writable fds", server_conf);
return;
}
if (rc == 0)
return;
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->write_fd == -1)
continue;
if (FD_ISSET(ocr->write_fd, &writable_fds))
continue;
(*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
}
#endif
}
/* possibly reap an other_child, return 0 if yes, -1 if not */
static int reap_other_child(int pid, ap_wait_t status)
{
other_child_rec *ocr, *nocr;
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->pid != pid)
continue;
ocr->pid = -1;
(*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
return 0;
}
return -1;
}
#endif
static void reclaim_child_processes(int terminate)
{
int i, status;
long int waittime = 1024 * 16; /* in usecs */
struct timeval tv;
int waitret, tries;
int not_dead_yet;
#ifdef HAS_OTHER_CHILD
other_child_rec *ocr, *nocr;
#endif
ap_sync_scoreboard_image();
for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
/* don't want to hold up progress any more than
* necessary, but we need to allow children a few moments to exit.
* Set delay with an exponential backoff.
*/
tv.tv_sec = waittime / 1000000;
tv.tv_usec = waittime % 1000000;
waittime = waittime * 4;
ap_select(0, NULL, NULL, NULL, &tv);
/* now see who is done */
not_dead_yet = 0;
for (i = 0; i < max_daemons_limit; ++i) {
int pid = ap_scoreboard_image->parent[i].pid;
if (pid == my_pid || pid == 0)
continue;
waitret = waitpid(pid, &status, WNOHANG);
if (waitret == pid || waitret == -1) {
ap_scoreboard_image->parent[i].pid = 0;
continue;
}
++not_dead_yet;
switch (tries) {
case 1: /* 16ms */
case 2: /* 82ms */
break;
case 3: /* 344ms */
case 4: /* 16ms */
case 5: /* 82ms */
case 6: /* 344ms */
case 7: /* 1.4sec */
/* ok, now it's being annoying */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
server_conf,
"child process %d still did not exit, sending a SIGTERM",
pid);
kill(pid, SIGTERM);
break;
case 8: /* 6 sec */
/* die child scum */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
"child process %d still did not exit, sending a SIGKILL",
pid);
kill(pid, SIGKILL);
break;
case 9: /* 14 sec */
/* gave it our best shot, but alas... If this really
* is a child we are trying to kill and it really hasn't
* exited, we will likely fail to bind to the port
* after the restart.
*/
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
"could not make child process %d exit, "
"attempting to continue anyway", pid);
break;
}
}
#ifdef HAS_OTHER_CHILD
for (ocr = other_children; ocr; ocr = nocr) {
nocr = ocr->next;
if (ocr->pid == -1)
continue;
waitret = waitpid(ocr->pid, &status, WNOHANG);
if (waitret == ocr->pid) {
ocr->pid = -1;
(*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
}
else if (waitret == 0) {
(*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
++not_dead_yet;
}
else if (waitret == -1) {
/* uh what the heck? they didn't call unregister? */
ocr->pid = -1;
(*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
}
}
#endif
if (!not_dead_yet) {
/* nothing left to wait for */
break;
}
}
}
/* Finally, this routine is used by the caretaker process to wait for
* a while...
*/
/* number of calls to wait_or_timeout between writable probes */
#ifndef INTERVAL_OF_WRITABLE_PROBES
#define INTERVAL_OF_WRITABLE_PROBES 10
#endif
static int wait_or_timeout_counter;
static int wait_or_timeout(ap_wait_t *status)
{
struct timeval tv;
int ret;
++wait_or_timeout_counter;
if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
wait_or_timeout_counter = 0;
#ifdef HAS_OTHER_CHILD
probe_writable_fds();
#endif
}
ret = waitpid(-1, status, WNOHANG);
if (ret == -1 && errno == EINTR) {
return -1;
}
if (ret > 0) {
return ret;
}
tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
ap_select(0, NULL, NULL, NULL, &tv);
return -1;
}
/* handle all varieties of core dumping signals */
static void sig_coredump(int sig)
{
chdir(ap_coredump_dir);
signal(sig, SIG_DFL);
kill(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.
*/
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;
is_graceful = graceful;
}
static void sig_term(int sig)
{
ap_start_shutdown();
}
static void restart(int sig)
{
#ifndef WIN32
ap_start_restart(sig == SIGWINCH);
#else
ap_start_restart(1);
#endif
}
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, server_conf, "sigaction(SIGSEGV)");
#ifdef SIGBUS
if (sigaction(SIGBUS, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGBUS)");
#endif
#ifdef SIGABORT
if (sigaction(SIGABORT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABORT)");
#endif
#ifdef SIGABRT
if (sigaction(SIGABRT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABRT)");
#endif
#ifdef SIGILL
if (sigaction(SIGILL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, 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, server_conf, "sigaction(SIGTERM)");
#ifdef SIGINT
if (sigaction(SIGINT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, 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, 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, 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, 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, server_conf, "sigaction(SIGHUP)");
if (sigaction(SIGWINCH, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGWINCH)");
#else
if (!one_process) {
signal(SIGSEGV, sig_coredump);
#ifdef SIGBUS
signal(SIGBUS, sig_coredump);
#endif /* SIGBUS */
#ifdef SIGABORT
signal(SIGABORT, sig_coredump);
#endif /* SIGABORT */
#ifdef SIGABRT
signal(SIGABRT, sig_coredump);
#endif /* SIGABRT */
#ifdef SIGILL
signal(SIGILL, sig_coredump);
#endif /* SIGILL */
#ifdef SIGXCPU
signal(SIGXCPU, SIG_DFL);
#endif /* SIGXCPU */
#ifdef SIGXFSZ
signal(SIGXFSZ, SIG_DFL);
#endif /* SIGXFSZ */
}
signal(SIGTERM, sig_term);
#ifdef SIGHUP
signal(SIGHUP, restart);
#endif /* SIGHUP */
#ifdef SIGWINCH
signal(SIGWINCH, restart);
#endif /* SIGWINCH */
#ifdef SIGPIPE
signal(SIGPIPE, SIG_IGN);
#endif /* SIGPIPE */
#endif
}
static void process_child_status(int pid, ap_wait_t status)
{
/* Child died... if it died due to a fatal error,
* we should simply bail out.
*/
if ((WIFEXITED(status)) &&
WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, server_conf,
"Child %d returned a Fatal error... \n"
"Apache is exiting!",
pid);
exit(APEXIT_CHILDFATAL);
}
if (WIFSIGNALED(status)) {
switch (WTERMSIG(status)) {
case SIGTERM:
case SIGHUP:
case SIGUSR1:
case SIGKILL:
break;
default:
#ifdef SYS_SIGLIST
#ifdef WCOREDUMP
if (WCOREDUMP(status)) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
server_conf,
"child pid %d exit signal %s (%d), "
"possible coredump in %s",
pid, (WTERMSIG(status) >= NumSIG) ? "" :
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
ap_coredump_dir);
}
else {
#endif
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
server_conf,
"child pid %d exit signal %s (%d)", pid,
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
#ifdef WCOREDUMP
}
#endif
#else
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
server_conf,
"child pid %d exit signal %d",
pid, WTERMSIG(status));
#endif
}
}
}
static int setup_listeners(server_rec *s)
{
ap_listen_rec *lr;
int num_listeners = 0;
if (ap_listen_open(s->process, s->port)) {
return 0;
}
for (lr = ap_listeners; lr; lr = lr->next) {
num_listeners++;
}
return num_listeners;
}
/*****************************************************************
* Here follows a long bunch of generic server bookkeeping stuff...
*/
#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
static void sock_disable_nagle(int s) /* ZZZ abstract */
{
/* The Nagle algorithm says that we should delay sending partial
* packets in hopes of getting more data. We don't want to do
* this; we are not telnet. There are bad interactions between
* persistent connections and Nagle's algorithm that have very severe
* performance penalties. (Failing to disable Nagle is not much of a
* problem with simple HTTP.)
*
* In spite of these problems, failure here is not a shooting offense.
*/
int just_say_no = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
sizeof(int)) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
"setsockopt: (TCP_NODELAY)");
}
}
#else
#define sock_disable_nagle(s) /* NOOP */
#endif
int ap_graceful_stop_signalled(void)
{
/* XXX - Does this really work? - Manoj */
return is_graceful;
}
/*****************************************************************
* Child process main loop.
*/
static void process_socket(ap_context_t *p, struct sockaddr *sa_client, int csd, int my_child_num, int my_thread_num)
{
struct sockaddr sa_server; /* ZZZZ */
size_t len = sizeof(struct sockaddr);
BUFF *conn_io;
conn_rec *current_conn;
ap_iol *iol;
long conn_id = my_child_num * HARD_THREAD_LIMIT + my_thread_num;
if (getsockname(csd, &sa_server, &len) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "getsockname");
close(csd);
return;
}
sock_disable_nagle(csd);
iol = unix_attach_socket(csd);
if (iol == NULL) {
if (errno == EBADF) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, NULL,
"filedescriptor (%u) larger than FD_SETSIZE (%u) "
"found, you probably need to rebuild Apache with a "
"larger FD_SETSIZE", csd, FD_SETSIZE);
}
else {
ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
"error attaching to socket");
}
close(csd);
return;
}
(void) ap_update_child_status(my_child_num, my_thread_num,
SERVER_BUSY_READ, (request_rec *) NULL);
conn_io = ap_bcreate(p, B_RDWR);
ap_bpush_iol(conn_io, iol);
current_conn = ap_new_connection(p, server_conf, conn_io,
(const struct sockaddr_in *) sa_client,
(const struct sockaddr_in *) &sa_server,
conn_id);
ap_process_connection(current_conn);
}
/* Sets workers_may_exit if we received a character on the pipe_of_death */
static void check_pipe_of_death(void)
{
pthread_mutex_lock(&pipe_of_death_mutex);
if (!workers_may_exit) {
int ret;
char pipe_read_char;
ret = read(listenfds[0].fd, &pipe_read_char, 1);
if (ret == -1 && errno == EAGAIN) {
/* 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;
}
}
pthread_mutex_unlock(&pipe_of_death_mutex);
}
static void * worker_thread(void * dummy)
{
proc_info * ti = dummy;
int process_slot = ti->pid;
int thread_slot = ti->tid;
ap_context_t *tpool = ti->tpool;
struct sockaddr sa_client;
ap_socket_t *csd = NULL;
ap_context_t *ptrans; /* Pool for per-transaction stuff */
ap_socket_t *sd = NULL;
int srv;
int curr_pollfd, last_pollfd = 0;
int thesock;
free(ti);
ap_create_context(&ptrans, tpool);
pthread_mutex_lock(&worker_thread_count_mutex);
worker_thread_count++;
pthread_mutex_unlock(&worker_thread_count_mutex);
/* TODO: Switch to a system where threads reuse the results from earlier
poll calls - manoj */
while (!workers_may_exit) {
workers_may_exit |= (ap_max_requests_per_child != 0) && (requests_this_child <= 0);
if (workers_may_exit) break;
(void) ap_update_child_status(process_slot, thread_slot, SERVER_READY,
(request_rec *) NULL);
SAFE_ACCEPT(intra_mutex_on(0));
if (workers_may_exit) {
SAFE_ACCEPT(intra_mutex_off(0));
break;
}
SAFE_ACCEPT(accept_mutex_on(0));
while (!workers_may_exit) {
srv = poll(listenfds, num_listenfds + 1, -1);
if (srv < 0) {
if (errno == EINTR) {
continue;
}
/* poll() will only return errors in catastrophic
* circumstances. Let's try exiting gracefully, for now. */
ap_log_error(APLOG_MARK, APLOG_ERR, (const server_rec *)
ap_get_server_conf(), "poll: (listen)");
workers_may_exit = 1;
}
if (workers_may_exit) break;
if (listenfds[0].revents & 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_listenfds == 1) {
sd = ap_listeners->sd;
goto got_fd;
}
else {
/* find a listener */
curr_pollfd = last_pollfd;
do {
curr_pollfd++;
if (curr_pollfd > num_listenfds) {
curr_pollfd = 1;
}
/* XXX: Should we check for POLLERR? */
if (listenfds[curr_pollfd].revents & POLLIN) {
last_pollfd = curr_pollfd;
ap_put_os_sock(&sd, &listenfds[curr_pollfd].fd, tpool);
goto got_fd;
}
} while (curr_pollfd != last_pollfd);
}
}
got_fd:
if (!workers_may_exit) {
ap_accept(&csd, sd);
SAFE_ACCEPT(accept_mutex_off(0));
SAFE_ACCEPT(intra_mutex_off(0));
}
else {
SAFE_ACCEPT(accept_mutex_off(0));
SAFE_ACCEPT(intra_mutex_off(0));
break;
}
ap_get_os_sock(csd, &thesock);
process_socket(ptrans, &sa_client, thesock, process_slot, thread_slot);
ap_clear_pool(ptrans);
requests_this_child--;
}
ap_destroy_pool(tpool);
ap_update_child_status(process_slot, thread_slot, SERVER_DEAD,
(request_rec *) NULL);
pthread_mutex_lock(&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(my_pid, SIGTERM);
}
pthread_mutex_unlock(&worker_thread_count_mutex);
return NULL;
}
static void child_main(int child_num_arg)
{
sigset_t sig_mask;
int signal_received;
pthread_t thread;
pthread_attr_t thread_attr;
int i;
int my_child_num = child_num_arg;
proc_info *my_info = NULL;
ap_listen_rec *lr;
my_pid = getpid();
ap_create_context(&pchild, pconf);
/*stuff to do before we switch id's, so we have permissions.*/
reopen_scoreboard(pchild);
SAFE_ACCEPT(intra_mutex_init(pchild, 1));
SAFE_ACCEPT(accept_mutex_child_init(pchild));
if (unixd_setup_child()) {
clean_child_exit(APEXIT_CHILDFATAL);
}
ap_child_init_hook(pchild, server_conf);
/*done with init critical section */
/* All threads should mask signals out, accoring to sigwait(2) man page */
sigfillset(&sig_mask);
if (pthread_sigmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
ap_log_error(APLOG_MARK, APLOG_ALERT, server_conf, "pthread_sigmask");
}
requests_this_child = ap_max_requests_per_child;
/* Set up the pollfd array */
listenfds = ap_palloc(pchild, sizeof(struct pollfd) * (num_listenfds + 1));
listenfds[0].fd = pipe_of_death[0];
listenfds[0].events = POLLIN;
listenfds[0].revents = 0;
for (lr = ap_listeners, i = 1; i <= num_listenfds; lr = lr->next, ++i) {
ap_get_os_sock(lr->sd, &listenfds[i].fd);
listenfds[i].events = POLLIN; /* should we add POLLPRI ?*/
listenfds[i].revents = 0;
}
/* Setup worker threads */
worker_thread_count = 0;
pthread_mutex_init(&worker_thread_count_mutex, NULL);
pthread_mutex_init(&pipe_of_death_mutex, NULL);
pthread_attr_init(&thread_attr);
pthread_attr_setdetachstate(&thread_attr, PTHREAD_CREATE_DETACHED);
for (i=0; i < ap_threads_per_child; i++) {
my_info = (proc_info *)malloc(sizeof(proc_info));
if (my_info == NULL) {
ap_log_error(APLOG_MARK, APLOG_ALERT, 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;
ap_create_context(&my_info->tpool, pchild);
/* We are creating threads right now */
(void) ap_update_child_status(my_child_num, i, SERVER_STARTING,
(request_rec *) NULL);
#ifndef NO_THREADS
if (pthread_create(&thread, &thread_attr, worker_thread, my_info)) {
ap_log_error(APLOG_MARK, APLOG_ALERT, server_conf,
"pthread_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);
}
#else
worker_thread(my_info);
/* The SIGTERM shouldn't let us reach this point, but just in case... */
clean_child_exit(APEXIT_OK);
#endif
/* We let each thread update it's own scoreboard entry. This is done
* because it let's us deal with tid better.
*/
}
pthread_attr_destroy(&thread_attr);
/* This thread will be the one responsible for handling signals */
sigemptyset(&sig_mask);
sigaddset(&sig_mask, SIGTERM);
sigaddset(&sig_mask, SIGINT);
sigwait(&sig_mask, &signal_received);
switch (signal_received) {
case SIGTERM:
case SIGINT:
just_die(signal_received);
break;
default:
ap_log_error(APLOG_MARK, APLOG_ALERT, server_conf,
"received impossible signal: %d", signal_received);
just_die(SIGTERM);
}
}
static int make_child(server_rec *s, int slot, time_t now) /* ZZZ */
{
int pid;
if (slot + 1 > max_daemons_limit) {
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, s, "fork: 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;
}
if (!pid) {
#ifdef AIX_BIND_PROCESSOR
/* By default, AIX binds to a single processor. This bit unbinds
children which will then bind to another CPU.
*/
#include <sys/processor.h>
int status = bindprocessor(BINDPROCESS, (int)getpid(),
PROCESSOR_CLASS_ANY);
if (status != OK)
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
"processor unbind failed %d", status);
#endif
RAISE_SIGSTOP(MAKE_CHILD);
signal(SIGTERM, just_die);
child_main(slot);
return 0;
}
/* else */
ap_scoreboard_image->parent[slot].pid = pid;
return 0;
}
/* start up a bunch of children */
static void startup_children(int number_to_start)
{
int i;
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
if (ap_scoreboard_image->parent[i].pid != 0) {
continue;
}
if (make_child(server_conf, i, 0) < 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;
thread_score *ss;
time_t now = 0;
int free_length;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead;
int total_non_dead;
/* initialize the free_list */
free_length = 0;
idle_thread_count = 0;
last_non_dead = -1;
total_non_dead = 0;
ap_check_signals();
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 all_dead_threads = 1;
int idle_thread_addition = 0;
if (i >= max_daemons_limit && free_length == idle_spawn_rate)
break;
for (j = 0; j < ap_threads_per_child; j++) {
ss = &ap_scoreboard_image->servers[i][j];
status = ss->status;
any_dying_threads = any_dying_threads || (status == SERVER_DEAD)
|| (status == SERVER_GRACEFUL);
all_dead_threads = all_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) {
++idle_thread_addition;
}
}
if (all_dead_threads && free_length < idle_spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
if (!all_dead_threads) {
last_non_dead = i;
}
if (!any_dying_threads) {
++total_non_dead;
idle_thread_count += idle_thread_addition;
}
}
max_daemons_limit = last_non_dead + 1;
if (idle_thread_count > max_spare_threads) {
/* Kill off one child */
char char_of_death = '!';
if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 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, server_conf,
"server reached MaxClients setting, consider"
" raising the MaxClients setting");
reported = 1;
}
idle_spawn_rate = 1;
}
else {
/* ZZZZ */
if (idle_spawn_rate >= 8) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
"server seems busy, (you may need "
"to increase StartServers, ThreadsPerChild "
"or Min/MaxSparetThreads), "
"spawning %d children, there are around %d idle "
"threads, and %d total children", idle_spawn_rate,
idle_thread_count, total_non_dead);
}
for (i = 0; i < free_length; ++i) {
make_child(server_conf, free_slots[i], now);
}
/* 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;
ap_wait_t status;
int pid;
int i;
while (!restart_pending && !shutdown_pending) {
pid = wait_or_timeout(&status);
if (pid >= 0) {
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);
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
*/
/* ZZZ abstract out for AP funcs. */
make_child(server_conf, child_slot, time(NULL));
--remaining_children_to_start;
}
#ifdef HAS_OTHER_CHILD
}
else if (reap_other_child(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, server_conf,
"long lost child came home! (pid %d)", 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(ap_context_t *_pconf, ap_context_t *plog, server_rec *s)
{
int remaining_children_to_start;
pconf = _pconf;
server_conf = s;
if (pipe(pipe_of_death) == -1) {
ap_log_error(APLOG_MARK, APLOG_ERR,
(const server_rec*) server_conf,
"pipe: (pipe_of_death)");
exit(1);
}
/* XXXXXX Removed because these functions don't exist anymore. When
These pipes are changed to apr_types, these functions won't be needed
anyway.
ap_note_cleanups_for_fd(pconf, pipe_of_death[0]);
ap_note_cleanups_for_fd(pconf, pipe_of_death[1]);
*/
if (fcntl(pipe_of_death[0], F_SETFD, O_NONBLOCK) == -1) {
ap_log_error(APLOG_MARK, APLOG_ERR,
(const server_rec*) server_conf,
"fcntl: O_NONBLOCKing (pipe_of_death)");
exit(1);
}
server_conf = s;
if ((num_listenfds = setup_listeners(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, s,
"no listening sockets available, shutting down");
return 1;
}
ap_log_pid(pconf, ap_pid_fname);
SAFE_ACCEPT(accept_mutex_init(pconf, 1));
if (!is_graceful) {
reinit_scoreboard(pconf);
}
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, server_conf,
"%s configured -- resuming normal operations",
ap_get_server_version());
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 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...
*/
if (ap_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
}
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,
server_conf,
"removed PID file %s (pid=%ld)",
pidfile, (long)getpid());
}
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
"caught SIGTERM, shutting down");
return 1;
}
/* we've been told to restart */
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();
if (is_graceful) {
int i, j;
char char_of_death = '!';
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
"SIGWINCH received. Doing graceful restart");
/* give the children the signal to die */
for (i = 0; i < ap_daemons_limit;) {
if (write(pipe_of_death[1], &char_of_death, 1) == -1) {
if (errno == EINTR) continue;
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "write pipe_of_death");
}
i++;
}
/* This is mostly for debugging... so that we know what is still
* gracefully dealing with existing request.
*/
for (i = 0; i < ap_daemons_limit; ++i) {
for (j = 0; j < ap_threads_per_child; j++) {
if (ap_scoreboard_image->servers[i][j].status != SERVER_DEAD) {
ap_scoreboard_image->servers[i][j].status = SERVER_GRACEFUL;
}
}
}
}
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 (ap_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
}
reclaim_child_processes(1); /* Start with SIGTERM */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
"SIGHUP received. Attempting to restart");
}
if (!is_graceful) {
ap_restart_time = time(NULL); /* ZZZZZ */
}
return 0;
}
static void mpmt_pthread_pre_config(ap_context_t *pconf, ap_context_t *plog, ap_context_t *ptemp)
{
static int restart_num = 0;
one_process = !!getenv("ONE_PROCESS");
/* sigh, want this only the second time around */
if (restart_num++ == 1) {
is_graceful = 0;
if (!one_process) {
unixd_detach();
}
my_pid = getpid();
}
unixd_pre_config();
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;
ap_lock_fname = DEFAULT_LOCKFILE;
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
ap_extended_status = 0;
ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
}
static void mpmt_pthread_hooks(void)
{
ap_hook_pre_config(mpmt_pthread_pre_config,NULL,NULL,HOOK_MIDDLE);
INIT_SIGLIST()
one_process = 0;
}
static const char *set_pidfile(cmd_parms *cmd, void *dummy, 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 <VirtualHost>";
}
ap_pid_fname = arg;
return NULL;
}
static const char *set_scoreboard(cmd_parms *cmd, void *dummy, 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, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_lock_fname = arg;
return NULL;
}
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, 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, 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) {
fprintf(stderr, "WARNING: detected MinSpareThreads set to non-positive.\n");
fprintf(stderr, "Resetting to 1 to avoid almost certain Apache failure.\n");
fprintf(stderr, "Please read the documentation.\n");
min_spare_threads = 1;
}
return NULL;
}
static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, 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, 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) {
fprintf(stderr, "WARNING: MaxClients of %d exceeds compile time limit "
"of %d servers,\n", ap_daemons_limit, HARD_SERVER_LIMIT);
fprintf(stderr, " lowering MaxClients to %d. To increase, please "
"see the\n", HARD_SERVER_LIMIT);
fprintf(stderr, " HARD_SERVER_LIMIT define in src/include/httpd.h.\n");
ap_daemons_limit = HARD_SERVER_LIMIT;
}
else if (ap_daemons_limit < 1) {
fprintf(stderr, "WARNING: Require MaxClients > 0, setting to 1\n");
ap_daemons_limit = 1;
}
return NULL;
}
static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, 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) {
fprintf(stderr, "WARNING: ThreadsPerChild of %d exceeds compile time"
"limit of %d threads,\n", ap_threads_per_child,
HARD_THREAD_LIMIT);
fprintf(stderr, " lowering ThreadsPerChild to %d. To increase, please"
"see the\n", HARD_THREAD_LIMIT);
fprintf(stderr, " HARD_THREAD_LIMIT define in src/include/httpd.h.\n");
}
else if (ap_threads_per_child < 1) {
fprintf(stderr, "WARNING: Require ThreadsPerChild > 0, setting to 1\n");
ap_threads_per_child = 1;
}
return NULL;
}
static const char *set_max_requests(cmd_parms *cmd, void *dummy, 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, char *arg)
{
struct stat 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);
/* ZZZ change this to the AP func FileInfo*/
if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
" does not exist or is not a directory", NULL);
}
ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
return NULL;
}
struct ap_thread_mutex {
pthread_mutex_t mutex;
};
API_EXPORT(ap_thread_mutex *) ap_thread_mutex_new(void)
{
ap_thread_mutex *mtx;
mtx = malloc(sizeof(ap_thread_mutex));
pthread_mutex_init(&(mtx->mutex), NULL);
return mtx;
}
API_EXPORT(void) ap_thread_mutex_lock(ap_thread_mutex *mtx)
{
/* Ignoring error conditions here. :( */
pthread_mutex_lock(&(mtx->mutex));
}
API_EXPORT(void) ap_thread_mutex_unlock(ap_thread_mutex *mtx)
{
/* Here too. */
pthread_mutex_unlock(&(mtx->mutex));
}
API_EXPORT(void) ap_thread_mutex_destroy(ap_thread_mutex *mtx)
{
/* Here too. */
pthread_mutex_destroy(&(mtx->mutex));
free(mtx);
}
static const command_rec mpmt_pthread_cmds[] = {
UNIX_DAEMON_COMMANDS
LISTEN_COMMANDS
{ "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
"A file for logging the server process ID"},
{ "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
"A file for Apache to maintain runtime process management information"},
{ "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
"The lockfile used when Apache needs to lock the accept() call"},
{ "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
"Number of child processes launched at server startup" },
{ "MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF, TAKE1,
"Minimum number of idle children, to handle request spikes" },
{ "MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF, TAKE1,
"Maximum number of idle children" },
{ "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
"Maximum number of children alive at the same time" },
{ "ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF, TAKE1,
"Number of threads each child creates" },
{ "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
"Maximum number of requests a particular child serves before dying." },
{ "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
"The location of the directory Apache changes to before dumping core" },
{ NULL }
};
module MODULE_VAR_EXPORT mpm_mpmt_pthread_module = {
STANDARD20_MODULE_STUFF,
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_pthread_cmds, /* command ap_table_t */
NULL, /* handlers */
mpmt_pthread_hooks /* register_hooks */
};
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