#include "apr.h"
#include "apr_portable.h"
#include "apr_strings.h"
#include "apr_file_io.h"
#include "apr_thread_proc.h"
#include "apr_signal.h"
#include "apr_thread_mutex.h"
#include "apr_proc_mutex.h"
#include "apr_poll.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#if APR_HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_PROCESSOR_H
#include <sys/processor.h>
#endif
#if !APR_HAS_THREADS
#error The Worker MPM requires APR threads, but they are unavailable.
#endif
#include "ap_config.h"
#include "httpd.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_core.h"
#include "http_connection.h"
#include "ap_mpm.h"
#include "mpm_common.h"
#include "ap_listen.h"
#include "scoreboard.h"
#include "fdqueue.h"
#include "mpm_default.h"
#include "util_mutex.h"
#include "unixd.h"
#include <signal.h>
#include <limits.h>
#ifndef DEFAULT_SERVER_LIMIT
#define DEFAULT_SERVER_LIMIT 16
#endif
#ifndef MAX_SERVER_LIMIT
#define MAX_SERVER_LIMIT 20000
#endif
#ifndef DEFAULT_THREAD_LIMIT
#define DEFAULT_THREAD_LIMIT 64
#endif
#ifndef MAX_THREAD_LIMIT
#define MAX_THREAD_LIMIT 20000
#endif
static int threads_per_child = 0;
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 max_workers = 0;
static int server_limit = 0;
static int thread_limit = 0;
static int had_healthy_child = 0;
static int dying = 0;
static int workers_may_exit = 0;
static int start_thread_may_exit = 0;
static int listener_may_exit = 0;
static int requests_this_child;
static int num_listensocks = 0;
static int resource_shortage = 0;
static fd_queue_t *worker_queue;
static fd_queue_info_t *worker_queue_info;
static int mpm_state = AP_MPMQ_STARTING;
typedef struct worker_retained_data {
int first_server_limit;
int first_thread_limit;
int module_loads;
int sick_child_detected;
ap_generation_t my_generation;
int volatile is_graceful;
int maxclients_reported;
int near_maxclients_reported;
int max_daemons_limit;
int idle_spawn_rate;
#ifndef MAX_SPAWN_RATE
#define MAX_SPAWN_RATE (32)
#endif
int hold_off_on_exponential_spawning;
} worker_retained_data;
static worker_retained_data *retained;
#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
typedef struct {
int pid;
int tid;
int sd;
} proc_info;
typedef struct {
apr_thread_t **threads;
apr_thread_t *listener;
int child_num_arg;
apr_threadattr_t *threadattr;
} thread_starter;
#define ID_FROM_CHILD_THREAD(c, t) ((c * thread_limit) + t)
static ap_pod_t *pod;
static int one_process = 0;
#ifdef DEBUG_SIGSTOP
int raise_sigstop_flags;
#endif
static apr_pool_t *pconf;
static apr_pool_t *pchild;
static pid_t ap_my_pid;
static pid_t parent_pid;
static apr_os_thread_t *listener_os_thread;
static apr_proc_mutex_t *accept_mutex;
#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
#define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS)
#else
#define SAFE_ACCEPT(stmt) (stmt)
#endif
#define LISTENER_SIGNAL SIGHUP
#define WORKER_SIGNAL AP_SIG_GRACEFUL
static apr_socket_t **worker_sockets;
static void close_worker_sockets(void)
{
int i;
for (i = 0; i < threads_per_child; i++) {
if (worker_sockets[i]) {
apr_socket_close(worker_sockets[i]);
worker_sockets[i] = NULL;
}
}
}
static void wakeup_listener(void)
{
listener_may_exit = 1;
if (!listener_os_thread) {
return;
}
ap_queue_info_term(worker_queue_info);
#ifdef HAVE_PTHREAD_KILL
pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
#else
kill(ap_my_pid, LISTENER_SIGNAL);
#endif
}
#define ST_INIT 0
#define ST_GRACEFUL 1
#define ST_UNGRACEFUL 2
static int terminate_mode = ST_INIT;
static void signal_threads(int mode)
{
if (terminate_mode == mode) {
return;
}
terminate_mode = mode;
mpm_state = AP_MPMQ_STOPPING;
wakeup_listener();
if (mode == ST_UNGRACEFUL) {
workers_may_exit = 1;
ap_queue_interrupt_all(worker_queue);
close_worker_sockets();
}
}
static int worker_query(int query_code, int *result, apr_status_t *rv)
{
*rv = APR_SUCCESS;
switch (query_code) {
case AP_MPMQ_MAX_DAEMON_USED:
*result = retained->max_daemons_limit;
break;
case AP_MPMQ_IS_THREADED:
*result = AP_MPMQ_STATIC;
break;
case AP_MPMQ_IS_FORKED:
*result = AP_MPMQ_DYNAMIC;
break;
case AP_MPMQ_HARD_LIMIT_DAEMONS:
*result = server_limit;
break;
case AP_MPMQ_HARD_LIMIT_THREADS:
*result = thread_limit;
break;
case AP_MPMQ_MAX_THREADS:
*result = threads_per_child;
break;
case AP_MPMQ_MIN_SPARE_DAEMONS:
*result = 0;
break;
case AP_MPMQ_MIN_SPARE_THREADS:
*result = min_spare_threads;
break;
case AP_MPMQ_MAX_SPARE_DAEMONS:
*result = 0;
break;
case AP_MPMQ_MAX_SPARE_THREADS:
*result = max_spare_threads;
break;
case AP_MPMQ_MAX_REQUESTS_DAEMON:
*result = ap_max_requests_per_child;
break;
case AP_MPMQ_MAX_DAEMONS:
*result = ap_daemons_limit;
break;
case AP_MPMQ_MPM_STATE:
*result = mpm_state;
break;
case AP_MPMQ_GENERATION:
*result = retained->my_generation;
break;
default:
*rv = APR_ENOTIMPL;
break;
}
return OK;
}
static void worker_note_child_killed(int childnum, pid_t pid, ap_generation_t gen)
{
if (childnum != -1) {
ap_run_child_status(ap_server_conf,
ap_scoreboard_image->parent[childnum].pid,
ap_scoreboard_image->parent[childnum].generation,
childnum, MPM_CHILD_EXITED);
ap_scoreboard_image->parent[childnum].pid = 0;
}
else {
ap_run_child_status(ap_server_conf, pid, gen, -1, MPM_CHILD_EXITED);
}
}
static void worker_note_child_started(int slot, pid_t pid)
{
ap_scoreboard_image->parent[slot].pid = pid;
ap_run_child_status(ap_server_conf,
ap_scoreboard_image->parent[slot].pid,
retained->my_generation, slot, MPM_CHILD_STARTED);
}
static void worker_note_child_lost_slot(int slot, pid_t newpid)
{
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00263)
"pid %" APR_PID_T_FMT " taking over scoreboard slot from "
"%" APR_PID_T_FMT "%s",
newpid,
ap_scoreboard_image->parent[slot].pid,
ap_scoreboard_image->parent[slot].quiescing ?
" (quiescing)" : "");
ap_run_child_status(ap_server_conf,
ap_scoreboard_image->parent[slot].pid,
ap_scoreboard_image->parent[slot].generation,
slot, MPM_CHILD_LOST_SLOT);
ap_register_extra_mpm_process(ap_scoreboard_image->parent[slot].pid,
ap_scoreboard_image->parent[slot].generation);
}
static const char *worker_get_name(void)
{
return "worker";
}
static void clean_child_exit(int code) __attribute__ ((noreturn));
static void clean_child_exit(int code)
{
mpm_state = AP_MPMQ_STOPPING;
if (pchild) {
apr_pool_destroy(pchild);
}
if (one_process) {
worker_note_child_killed( 0, 0, 0);
}
exit(code);
}
static void just_die(int sig)
{
clean_child_exit(0);
}
static int child_fatal;
static int volatile shutdown_pending;
static int volatile restart_pending;
static void ap_start_shutdown(int graceful)
{
mpm_state = AP_MPMQ_STOPPING;
if (shutdown_pending == 1) {
return;
}
shutdown_pending = 1;
retained->is_graceful = graceful;
}
static void ap_start_restart(int graceful)
{
mpm_state = AP_MPMQ_STOPPING;
if (restart_pending == 1) {
return;
}
restart_pending = 1;
retained->is_graceful = graceful;
}
static void sig_term(int sig)
{
ap_start_shutdown(sig == AP_SIG_GRACEFUL_STOP);
}
static void restart(int sig)
{
ap_start_restart(sig == AP_SIG_GRACEFUL);
}
static void set_signals(void)
{
#ifndef NO_USE_SIGACTION
struct sigaction sa;
#endif
if (!one_process) {
ap_fatal_signal_setup(ap_server_conf, pconf);
}
#ifndef NO_USE_SIGACTION
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sig_term;
if (sigaction(SIGTERM, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00264)
"sigaction(SIGTERM)");
#ifdef AP_SIG_GRACEFUL_STOP
if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00265)
"sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
#endif
#ifdef SIGINT
if (sigaction(SIGINT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00266)
"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, APLOGNO(00267)
"sigaction(SIGXCPU)");
#endif
#ifdef SIGXFSZ
sa.sa_handler = SIG_IGN;
if (sigaction(SIGXFSZ, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00268)
"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, APLOGNO(00269)
"sigaction(SIGPIPE)");
#endif
sigaddset(&sa.sa_mask, SIGHUP);
sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
sa.sa_handler = restart;
if (sigaction(SIGHUP, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00270)
"sigaction(SIGHUP)");
if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00271)
"sigaction(" AP_SIG_GRACEFUL_STRING ")");
#else
if (!one_process) {
#ifdef SIGXCPU
apr_signal(SIGXCPU, SIG_DFL);
#endif
#ifdef SIGXFSZ
apr_signal(SIGXFSZ, SIG_IGN);
#endif
}
apr_signal(SIGTERM, sig_term);
#ifdef SIGHUP
apr_signal(SIGHUP, restart);
#endif
#ifdef AP_SIG_GRACEFUL
apr_signal(AP_SIG_GRACEFUL, restart);
#endif
#ifdef AP_SIG_GRACEFUL_STOP
apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
#endif
#ifdef SIGPIPE
apr_signal(SIGPIPE, SIG_IGN);
#endif
#endif
}
static void process_socket(apr_thread_t *thd, apr_pool_t *p, apr_socket_t *sock,
int my_child_num,
int my_thread_num, apr_bucket_alloc_t *bucket_alloc)
{
conn_rec *current_conn;
long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
ap_sb_handle_t *sbh;
ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num);
current_conn = ap_run_create_connection(p, ap_server_conf, sock,
conn_id, sbh, bucket_alloc);
if (current_conn) {
current_conn->current_thread = thd;
ap_process_connection(current_conn, sock);
ap_lingering_close(current_conn);
}
}
static void check_infinite_requests(void)
{
if (ap_max_requests_per_child) {
signal_threads(ST_GRACEFUL);
}
else {
requests_this_child = INT_MAX;
}
}
static void unblock_signal(int sig)
{
sigset_t sig_mask;
sigemptyset(&sig_mask);
sigaddset(&sig_mask, sig);
#if defined(SIGPROCMASK_SETS_THREAD_MASK)
sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
#else
pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
#endif
}
static void dummy_signal_handler(int sig)
{
}
static void accept_mutex_error(const char *func, apr_status_t rv, int process_slot)
{
int level = APLOG_EMERG;
if (ap_scoreboard_image->parent[process_slot].generation !=
ap_scoreboard_image->global->running_generation) {
level = APLOG_DEBUG;
}
else if (requests_this_child == INT_MAX
|| ((requests_this_child == ap_max_requests_per_child)
&& ap_max_requests_per_child)) {
ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00272)
"apr_proc_mutex_%s failed "
"before this child process served any requests.",
func);
clean_child_exit(APEXIT_CHILDSICK);
}
ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00273)
"apr_proc_mutex_%s failed. Attempting to "
"shutdown process gracefully.", func);
signal_threads(ST_GRACEFUL);
}
static void * APR_THREAD_FUNC listener_thread(apr_thread_t *thd, void * dummy)
{
proc_info * ti = dummy;
int process_slot = ti->pid;
apr_pool_t *tpool = apr_thread_pool_get(thd);
void *csd = NULL;
apr_pool_t *ptrans = NULL;
apr_pollset_t *pollset;
apr_status_t rv;
ap_listen_rec *lr;
int have_idle_worker = 0;
int last_poll_idx = 0;
free(ti);
rv = apr_pollset_create(&pollset, num_listensocks, tpool, 0);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
"Couldn't create pollset in thread;"
" check system or user limits");
clean_child_exit(APEXIT_CHILDSICK);
}
for (lr = ap_listeners; lr != NULL; lr = lr->next) {
apr_pollfd_t pfd = { 0 };
pfd.desc_type = APR_POLL_SOCKET;
pfd.desc.s = lr->sd;
pfd.reqevents = APR_POLLIN;
pfd.client_data = lr;
rv = apr_pollset_add(pollset, &pfd);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
"Couldn't create add listener to pollset;"
" check system or user limits");
clean_child_exit(APEXIT_CHILDSICK);
}
lr->accept_func = ap_unixd_accept;
}
unblock_signal(LISTENER_SIGNAL);
apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
while (1) {
if (requests_this_child <= 0) {
check_infinite_requests();
}
if (listener_may_exit) break;
if (!have_idle_worker) {
rv = ap_queue_info_wait_for_idler(worker_queue_info,
&ptrans);
if (APR_STATUS_IS_EOF(rv)) {
break;
}
else if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
"apr_queue_info_wait failed. Attempting to "
" shutdown process gracefully.");
signal_threads(ST_GRACEFUL);
break;
}
have_idle_worker = 1;
}
if ((rv = SAFE_ACCEPT(apr_proc_mutex_lock(accept_mutex)))
!= APR_SUCCESS) {
if (!listener_may_exit) {
accept_mutex_error("lock", rv, process_slot);
}
break;
}
if (!ap_listeners->next) {
lr = ap_listeners;
}
else {
while (!listener_may_exit) {
apr_int32_t numdesc;
const apr_pollfd_t *pdesc;
rv = apr_pollset_poll(pollset, -1, &numdesc, &pdesc);
if (rv != APR_SUCCESS) {
if (APR_STATUS_IS_EINTR(rv)) {
continue;
}
ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
"apr_pollset_poll: (listen)");
signal_threads(ST_GRACEFUL);
}
if (listener_may_exit) break;
if (last_poll_idx >= numdesc)
last_poll_idx = 0;
lr = pdesc[last_poll_idx++].client_data;
break;
}
}
if (!listener_may_exit) {
if (ptrans == NULL) {
apr_allocator_t *allocator;
apr_allocator_create(&allocator);
apr_allocator_max_free_set(allocator, ap_max_mem_free);
apr_pool_create_ex(&ptrans, pconf, NULL, allocator);
apr_allocator_owner_set(allocator, ptrans);
}
apr_pool_tag(ptrans, "transaction");
rv = lr->accept_func(&csd, lr, ptrans);
AP_DEBUG_ASSERT(rv == APR_SUCCESS || !csd);
if (rv == APR_EGENERAL) {
resource_shortage = 1;
signal_threads(ST_GRACEFUL);
}
if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(accept_mutex)))
!= APR_SUCCESS) {
if (listener_may_exit) {
break;
}
accept_mutex_error("unlock", rv, process_slot);
}
if (csd != NULL) {
rv = ap_queue_push(worker_queue, csd, ptrans);
if (rv) {
apr_socket_close(csd);
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
"ap_queue_push failed");
}
else {
have_idle_worker = 0;
}
}
}
else {
if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(accept_mutex)))
!= APR_SUCCESS) {
int level = APLOG_EMERG;
if (ap_scoreboard_image->parent[process_slot].generation !=
ap_scoreboard_image->global->running_generation) {
level = APLOG_DEBUG;
}
ap_log_error(APLOG_MARK, level, rv, ap_server_conf, APLOGNO(00274)
"apr_proc_mutex_unlock failed. Attempting to "
"shutdown process gracefully.");
signal_threads(ST_GRACEFUL);
}
break;
}
}
ap_close_listeners();
ap_queue_term(worker_queue);
dying = 1;
ap_scoreboard_image->parent[process_slot].quiescing = 1;
kill(ap_my_pid, SIGTERM);
apr_thread_exit(thd, APR_SUCCESS);
return NULL;
}
static void * APR_THREAD_FUNC worker_thread(apr_thread_t *thd, void * dummy)
{
proc_info * ti = dummy;
int process_slot = ti->pid;
int thread_slot = ti->tid;
apr_socket_t *csd = NULL;
apr_bucket_alloc_t *bucket_alloc;
apr_pool_t *last_ptrans = NULL;
apr_pool_t *ptrans;
apr_status_t rv;
int is_idle = 0;
free(ti);
ap_scoreboard_image->servers[process_slot][thread_slot].pid = ap_my_pid;
ap_scoreboard_image->servers[process_slot][thread_slot].tid = apr_os_thread_current();
ap_scoreboard_image->servers[process_slot][thread_slot].generation = retained->my_generation;
ap_update_child_status_from_indexes(process_slot, thread_slot, SERVER_STARTING, NULL);
#ifdef HAVE_PTHREAD_KILL
unblock_signal(WORKER_SIGNAL);
apr_signal(WORKER_SIGNAL, dummy_signal_handler);
#endif
while (!workers_may_exit) {
if (!is_idle) {
rv = ap_queue_info_set_idle(worker_queue_info, last_ptrans);
last_ptrans = NULL;
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
"ap_queue_info_set_idle failed. Attempting to "
"shutdown process gracefully.");
signal_threads(ST_GRACEFUL);
break;
}
is_idle = 1;
}
ap_update_child_status_from_indexes(process_slot, thread_slot, SERVER_READY, NULL);
worker_pop:
if (workers_may_exit) {
break;
}
rv = ap_queue_pop(worker_queue, &csd, &ptrans);
if (rv != APR_SUCCESS) {
if (APR_STATUS_IS_EOF(rv)) {
break;
}
else if (APR_STATUS_IS_EINTR(rv)) {
goto worker_pop;
}
else if (!workers_may_exit) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
"ap_queue_pop failed");
}
continue;
}
is_idle = 0;
worker_sockets[thread_slot] = csd;
bucket_alloc = apr_bucket_alloc_create(ptrans);
process_socket(thd, ptrans, csd, process_slot, thread_slot, bucket_alloc);
worker_sockets[thread_slot] = NULL;
requests_this_child--;
apr_pool_clear(ptrans);
last_ptrans = ptrans;
}
ap_update_child_status_from_indexes(process_slot, thread_slot,
(dying) ? SERVER_DEAD : SERVER_GRACEFUL, (request_rec *) NULL);
apr_thread_exit(thd, APR_SUCCESS);
return NULL;
}
static int check_signal(int signum)
{
switch (signum) {
case SIGTERM:
case SIGINT:
return 1;
}
return 0;
}
static void create_listener_thread(thread_starter *ts)
{
int my_child_num = ts->child_num_arg;
apr_threadattr_t *thread_attr = ts->threadattr;
proc_info *my_info;
apr_status_t rv;
my_info = (proc_info *)ap_malloc(sizeof(proc_info));
my_info->pid = my_child_num;
my_info->tid = -1;
my_info->sd = 0;
rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
my_info, pchild);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00275)
"apr_thread_create: unable to create listener thread");
clean_child_exit(APEXIT_CHILDSICK);
}
apr_os_thread_get(&listener_os_thread, ts->listener);
}
static void * APR_THREAD_FUNC start_threads(apr_thread_t *thd, void *dummy)
{
thread_starter *ts = dummy;
apr_thread_t **threads = ts->threads;
apr_threadattr_t *thread_attr = ts->threadattr;
int child_num_arg = ts->child_num_arg;
int my_child_num = child_num_arg;
proc_info *my_info;
apr_status_t rv;
int i;
int threads_created = 0;
int listener_started = 0;
int loops;
int prev_threads_created;
worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
rv = ap_queue_init(worker_queue, threads_per_child, pchild);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
"ap_queue_init() failed");
clean_child_exit(APEXIT_CHILDFATAL);
}
rv = ap_queue_info_create(&worker_queue_info, pchild,
threads_per_child);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
"ap_queue_info_create() failed");
clean_child_exit(APEXIT_CHILDFATAL);
}
worker_sockets = apr_pcalloc(pchild, threads_per_child
* sizeof(apr_socket_t *));
loops = prev_threads_created = 0;
while (1) {
for (i = 0; i < 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 *)ap_malloc(sizeof(proc_info));
my_info->pid = my_child_num;
my_info->tid = i;
my_info->sd = 0;
ap_update_child_status_from_indexes(my_child_num, i,
SERVER_STARTING, NULL);
rv = apr_thread_create(&threads[i], thread_attr,
worker_thread, my_info, pchild);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
"apr_thread_create: unable to create worker thread");
clean_child_exit(APEXIT_CHILDSICK);
}
threads_created++;
}
if (!listener_started && threads_created) {
create_listener_thread(ts);
listener_started = 1;
}
if (start_thread_may_exit || threads_created == threads_per_child) {
break;
}
apr_sleep(apr_time_from_sec(1));
++loops;
if (loops % 120 == 0) {
if (prev_threads_created == threads_created) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
"child %" APR_PID_T_FMT " isn't taking over "
"slots very quickly (%d of %d)",
ap_my_pid, threads_created, threads_per_child);
}
prev_threads_created = threads_created;
}
}
apr_thread_exit(thd, APR_SUCCESS);
return NULL;
}
static void join_workers(apr_thread_t *listener, apr_thread_t **threads,
int mode)
{
int i;
apr_status_t rv, thread_rv;
if (listener) {
int iter;
iter = 0;
while (iter < 10 &&
#ifdef HAVE_PTHREAD_KILL
pthread_kill(*listener_os_thread, 0)
#else
kill(ap_my_pid, 0)
#endif
== 0) {
apr_sleep(apr_time_make(0, 500000));
wakeup_listener();
++iter;
}
if (iter >= 10) {
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00276)
"the listener thread didn't exit");
}
else {
rv = apr_thread_join(&thread_rv, listener);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00277)
"apr_thread_join: unable to join listener thread");
}
}
}
for (i = 0; i < threads_per_child; i++) {
if (threads[i]) {
if (mode != ST_GRACEFUL) {
#ifdef HAVE_PTHREAD_KILL
apr_os_thread_t *worker_os_thread;
apr_os_thread_get(&worker_os_thread, threads[i]);
pthread_kill(*worker_os_thread, WORKER_SIGNAL);
#endif
}
rv = apr_thread_join(&thread_rv, threads[i]);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00278)
"apr_thread_join: unable to join worker "
"thread %d",
i);
}
}
}
}
static void join_start_thread(apr_thread_t *start_thread_id)
{
apr_status_t rv, thread_rv;
start_thread_may_exit = 1;
rv = apr_thread_join(&thread_rv, start_thread_id);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00279)
"apr_thread_join: unable to join the start "
"thread");
}
}
static void child_main(int child_num_arg)
{
apr_thread_t **threads;
apr_status_t rv;
thread_starter *ts;
apr_threadattr_t *thread_attr;
apr_thread_t *start_thread_id;
mpm_state = AP_MPMQ_STARTING;
ap_my_pid = getpid();
ap_fatal_signal_child_setup(ap_server_conf);
apr_pool_create(&pchild, pconf);
ap_reopen_scoreboard(pchild, NULL, 0);
rv = SAFE_ACCEPT(apr_proc_mutex_child_init(&accept_mutex,
apr_proc_mutex_lockfile(accept_mutex),
pchild));
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00280)
"Couldn't initialize cross-process lock in child");
clean_child_exit(APEXIT_CHILDFATAL);
}
if (ap_run_drop_privileges(pchild, ap_server_conf)) {
clean_child_exit(APEXIT_CHILDFATAL);
}
ap_run_child_init(pchild, ap_server_conf);
rv = apr_setup_signal_thread();
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00281)
"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 {
requests_this_child = INT_MAX;
}
threads = (apr_thread_t **)ap_calloc(1,
sizeof(apr_thread_t *) * threads_per_child);
ts = (thread_starter *)apr_palloc(pchild, sizeof(*ts));
apr_threadattr_create(&thread_attr, pchild);
apr_threadattr_detach_set(thread_attr, 0);
if (ap_thread_stacksize != 0) {
rv = apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
if (rv != APR_SUCCESS && rv != APR_ENOTIMPL) {
ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(02435)
"WARNING: ThreadStackSize of %" APR_SIZE_T_FMT " is "
"inappropriate, using default",
ap_thread_stacksize);
}
}
ts->threads = threads;
ts->listener = NULL;
ts->child_num_arg = child_num_arg;
ts->threadattr = thread_attr;
rv = apr_thread_create(&start_thread_id, thread_attr, start_threads,
ts, pchild);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00282)
"apr_thread_create: unable to create worker thread");
clean_child_exit(APEXIT_CHILDSICK);
}
mpm_state = AP_MPMQ_RUNNING;
if (one_process) {
apr_signal_thread(check_signal);
join_start_thread(start_thread_id);
signal_threads(ST_UNGRACEFUL);
join_workers(ts->listener, threads, ST_UNGRACEFUL);
}
else {
unblock_signal(SIGTERM);
apr_signal(SIGTERM, dummy_signal_handler);
while (1) {
rv = ap_mpm_podx_check(pod);
if (rv == AP_MPM_PODX_NORESTART) {
switch(terminate_mode) {
case ST_GRACEFUL:
rv = AP_MPM_PODX_GRACEFUL;
break;
case ST_UNGRACEFUL:
rv = AP_MPM_PODX_RESTART;
break;
}
}
if (rv == AP_MPM_PODX_GRACEFUL || rv == AP_MPM_PODX_RESTART) {
join_start_thread(start_thread_id);
signal_threads(rv == AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
break;
}
}
join_workers(ts->listener, threads,
rv == AP_MPM_PODX_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
}
free(threads);
clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 0);
}
static int make_child(server_rec *s, int slot)
{
int pid;
if (slot + 1 > retained->max_daemons_limit) {
retained->max_daemons_limit = slot + 1;
}
if (one_process) {
set_signals();
worker_note_child_started(slot, getpid());
child_main(slot);
}
if ((pid = fork()) == -1) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00283)
"fork: Unable to fork new process");
apr_sleep(apr_time_from_sec(10));
return -1;
}
if (!pid) {
#ifdef HAVE_BINDPROCESSOR
int status = bindprocessor(BINDPROCESS, (int)getpid(),
PROCESSOR_CLASS_ANY);
if (status != OK)
ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
ap_server_conf, APLOGNO(00284)
"processor unbind failed");
#endif
RAISE_SIGSTOP(MAKE_CHILD);
apr_signal(SIGTERM, just_die);
child_main(slot);
}
if (ap_scoreboard_image->parent[slot].pid != 0) {
worker_note_child_lost_slot(slot, pid);
}
ap_scoreboard_image->parent[slot].quiescing = 0;
worker_note_child_started(slot, pid);
return 0;
}
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;
}
}
static void perform_idle_server_maintenance(void)
{
int i, j;
int idle_thread_count;
worker_score *ws;
process_score *ps;
int free_length;
int totally_free_length = 0;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead;
int total_non_dead;
int active_thread_count = 0;
free_length = 0;
idle_thread_count = 0;
last_non_dead = -1;
total_non_dead = 0;
for (i = 0; i < ap_daemons_limit; ++i) {
int status = SERVER_DEAD;
int any_dying_threads = 0;
int any_dead_threads = 0;
int all_dead_threads = 1;
int child_threads_active = 0;
if (i >= retained->max_daemons_limit && totally_free_length == retained->idle_spawn_rate)
break;
ps = &ap_scoreboard_image->parent[i];
for (j = 0; j < 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);
all_dead_threads = all_dead_threads &&
(status == SERVER_DEAD ||
status == SERVER_GRACEFUL);
if (ps->pid != 0) {
if (status <= SERVER_READY &&
!ps->quiescing &&
ps->generation == retained->my_generation) {
++idle_thread_count;
}
if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
++child_threads_active;
}
}
}
active_thread_count += child_threads_active;
if (any_dead_threads && totally_free_length < retained->idle_spawn_rate
&& free_length < MAX_SPAWN_RATE
&& (!ps->pid
|| ps->quiescing)) {
if (all_dead_threads) {
free_slots[free_length] = free_slots[totally_free_length];
free_slots[totally_free_length++] = i;
}
else {
free_slots[free_length] = i;
}
++free_length;
}
else if (child_threads_active == threads_per_child) {
had_healthy_child = 1;
}
if (!any_dying_threads) {
last_non_dead = i;
++total_non_dead;
}
}
if (retained->sick_child_detected) {
if (had_healthy_child) {
retained->sick_child_detected = 0;
}
else {
shutdown_pending = 1;
child_fatal = 1;
ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
ap_server_conf, APLOGNO(02325)
"A resource shortage or other unrecoverable failure "
"was encountered before any child process initialized "
"successfully... httpd is exiting!");
return;
}
}
retained->max_daemons_limit = last_non_dead + 1;
if (idle_thread_count > max_spare_threads) {
ap_mpm_podx_signal(pod, AP_MPM_PODX_GRACEFUL);
retained->idle_spawn_rate = 1;
}
else if (idle_thread_count < min_spare_threads) {
if (free_length == 0) {
if (active_thread_count >= ap_daemons_limit * threads_per_child) {
if (0 == idle_thread_count) {
if (!retained->maxclients_reported) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00286)
"server reached MaxRequestWorkers "
"setting, consider raising the "
"MaxRequestWorkers setting");
retained->maxclients_reported = 1;
}
} else {
if (!retained->near_maxclients_reported) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00287)
"server is within MinSpareThreads of "
"MaxRequestWorkers, consider raising the "
"MaxRequestWorkers setting");
retained->near_maxclients_reported = 1;
}
}
}
else {
ap_log_error(APLOG_MARK, APLOG_ERR, 0,
ap_server_conf, APLOGNO(00288)
"scoreboard is full, not at MaxRequestWorkers");
}
retained->idle_spawn_rate = 1;
}
else {
if (free_length > retained->idle_spawn_rate) {
free_length = retained->idle_spawn_rate;
}
if (retained->idle_spawn_rate >= 8) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0,
ap_server_conf, APLOGNO(00289)
"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]);
}
if (retained->hold_off_on_exponential_spawning) {
--retained->hold_off_on_exponential_spawning;
}
else if (retained->idle_spawn_rate < MAX_SPAWN_RATE) {
retained->idle_spawn_rate *= 2;
}
}
}
else {
retained->idle_spawn_rate = 1;
}
}
static void server_main_loop(int remaining_children_to_start)
{
ap_generation_t old_gen;
int child_slot;
apr_exit_why_e exitwhy;
int status, processed_status;
apr_proc_t pid;
int i;
while (!restart_pending && !shutdown_pending) {
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
if (pid.pid != -1) {
processed_status = ap_process_child_status(&pid, exitwhy, status);
child_slot = ap_find_child_by_pid(&pid);
if (processed_status == APEXIT_CHILDFATAL) {
if (child_slot < 0
|| ap_get_scoreboard_process(child_slot)->generation
== retained->my_generation) {
shutdown_pending = 1;
child_fatal = 1;
return;
}
else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00290)
"Ignoring fatal error in child of previous "
"generation (pid %ld).",
(long)pid.pid);
retained->sick_child_detected = 1;
}
}
else if (processed_status == APEXIT_CHILDSICK) {
retained->sick_child_detected = 1;
}
if (child_slot >= 0) {
for (i = 0; i < threads_per_child; i++)
ap_update_child_status_from_indexes(child_slot, i, SERVER_DEAD,
(request_rec *) NULL);
worker_note_child_killed(child_slot, 0, 0);
ap_scoreboard_image->parent[child_slot].quiescing = 0;
if (processed_status == APEXIT_CHILDSICK) {
retained->idle_spawn_rate = 1;
}
else if (remaining_children_to_start
&& child_slot < ap_daemons_limit) {
make_child(ap_server_conf, child_slot);
--remaining_children_to_start;
}
}
else if (ap_unregister_extra_mpm_process(pid.pid, &old_gen) == 1) {
worker_note_child_killed(-1,
pid.pid, old_gen);
if (processed_status == APEXIT_CHILDSICK
&& old_gen == retained->my_generation) {
retained->idle_spawn_rate = 1;
}
#if APR_HAS_OTHER_CHILD
}
else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH,
status) == 0) {
#endif
}
else if (retained->is_graceful) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
ap_server_conf, APLOGNO(00291)
"long lost child came home! (pid %ld)",
(long)pid.pid);
}
continue;
}
else if (remaining_children_to_start) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
continue;
}
perform_idle_server_maintenance();
}
}
static int worker_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
{
int remaining_children_to_start;
apr_status_t rv;
ap_log_pid(pconf, ap_pid_fname);
rv = ap_proc_mutex_create(&accept_mutex, NULL, AP_ACCEPT_MUTEX_TYPE, NULL,
s, _pconf, 0);
if (rv != APR_SUCCESS) {
mpm_state = AP_MPMQ_STOPPING;
return DONE;
}
if (!retained->is_graceful) {
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
mpm_state = AP_MPMQ_STOPPING;
return DONE;
}
ap_scoreboard_image->global->running_generation = retained->my_generation;
}
restart_pending = shutdown_pending = 0;
set_signals();
if (max_spare_threads < min_spare_threads + threads_per_child)
max_spare_threads = min_spare_threads + threads_per_child;
remaining_children_to_start = ap_daemons_to_start;
if (remaining_children_to_start > ap_daemons_limit) {
remaining_children_to_start = ap_daemons_limit;
}
if (!retained->is_graceful) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
}
else {
retained->hold_off_on_exponential_spawning = 10;
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00292)
"%s configured -- resuming normal operations",
ap_get_server_description());
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00293)
"Server built: %s", ap_get_server_built());
ap_log_command_line(plog, s);
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00294)
"Accept mutex: %s (default: %s)",
apr_proc_mutex_name(accept_mutex),
apr_proc_mutex_defname());
mpm_state = AP_MPMQ_RUNNING;
server_main_loop(remaining_children_to_start);
mpm_state = AP_MPMQ_STOPPING;
if (shutdown_pending && !retained->is_graceful) {
ap_mpm_podx_killpg(pod, ap_daemons_limit, AP_MPM_PODX_RESTART);
ap_reclaim_child_processes(1,
worker_note_child_killed);
if (!child_fatal) {
ap_remove_pid(pconf, ap_pid_fname);
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
ap_server_conf, APLOGNO(00295) "caught SIGTERM, shutting down");
}
return DONE;
} else if (shutdown_pending) {
int active_children;
int index;
apr_time_t cutoff = 0;
ap_close_listeners();
ap_mpm_podx_killpg(pod, ap_daemons_limit, AP_MPM_PODX_GRACEFUL);
ap_relieve_child_processes(worker_note_child_killed);
if (!child_fatal) {
ap_remove_pid(pconf, ap_pid_fname);
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00296)
"caught " AP_SIG_GRACEFUL_STOP_STRING
", shutting down gracefully");
}
if (ap_graceful_shutdown_timeout) {
cutoff = apr_time_now() +
apr_time_from_sec(ap_graceful_shutdown_timeout);
}
shutdown_pending = 0;
do {
apr_sleep(apr_time_from_sec(1));
ap_relieve_child_processes(worker_note_child_killed);
active_children = 0;
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
active_children = 1;
break;
}
}
} while (!shutdown_pending && active_children &&
(!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
ap_mpm_podx_killpg(pod, ap_daemons_limit, AP_MPM_PODX_RESTART);
ap_reclaim_child_processes(1, worker_note_child_killed);
return DONE;
}
apr_signal(SIGHUP, SIG_IGN);
if (one_process) {
return DONE;
}
++retained->my_generation;
ap_scoreboard_image->global->running_generation = retained->my_generation;
if (retained->is_graceful) {
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00297)
AP_SIG_GRACEFUL_STRING " received. Doing graceful restart");
ap_mpm_podx_killpg(pod, ap_daemons_limit, AP_MPM_PODX_GRACEFUL);
}
else {
ap_mpm_podx_killpg(pod, ap_daemons_limit, AP_MPM_PODX_RESTART);
ap_reclaim_child_processes(1,
worker_note_child_killed);
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00298)
"SIGHUP received. Attempting to restart");
}
return OK;
}
static int worker_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
int startup = 0;
int level_flags = 0;
apr_status_t rv;
pconf = p;
if (retained->module_loads == 1) {
startup = 1;
level_flags |= APLOG_STARTUP;
}
if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
(startup ? NULL : s),
"no listening sockets available, shutting down");
return DONE;
}
if (!one_process) {
if ((rv = ap_mpm_podx_open(pconf, &pod))) {
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
(startup ? NULL : s),
"could not open pipe-of-death");
return DONE;
}
}
return OK;
}
static int worker_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
apr_pool_t *ptemp)
{
int no_detach, debug, foreground;
apr_status_t rv;
const char *userdata_key = "mpm_worker_module";
mpm_state = AP_MPMQ_STARTING;
debug = ap_exists_config_define("DEBUG");
if (debug) {
foreground = one_process = 1;
no_detach = 0;
}
else {
one_process = ap_exists_config_define("ONE_PROCESS");
no_detach = ap_exists_config_define("NO_DETACH");
foreground = ap_exists_config_define("FOREGROUND");
}
ap_mutex_register(pconf, AP_ACCEPT_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
retained = ap_retained_data_get(userdata_key);
if (!retained) {
retained = ap_retained_data_create(userdata_key, sizeof(*retained));
retained->max_daemons_limit = -1;
retained->idle_spawn_rate = 1;
}
++retained->module_loads;
if (retained->module_loads == 2) {
if (!one_process && !foreground) {
ap_fatal_signal_setup(ap_server_conf, pconf);
rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
: APR_PROC_DETACH_DAEMONIZE);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00299)
"apr_proc_detach failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
}
parent_pid = ap_my_pid = getpid();
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;
server_limit = DEFAULT_SERVER_LIMIT;
thread_limit = DEFAULT_THREAD_LIMIT;
ap_daemons_limit = server_limit;
threads_per_child = DEFAULT_THREADS_PER_CHILD;
max_workers = ap_daemons_limit * threads_per_child;
had_healthy_child = 0;
ap_extended_status = 0;
return OK;
}
static int worker_check_config(apr_pool_t *p, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s)
{
int startup = 0;
if (retained->module_loads == 1) {
startup = 1;
}
if (server_limit > MAX_SERVER_LIMIT) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00300)
"WARNING: ServerLimit of %d exceeds compile-time "
"limit of", server_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d servers, decreasing to %d.",
MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00301)
"ServerLimit of %d exceeds compile-time limit "
"of %d, decreasing to match",
server_limit, MAX_SERVER_LIMIT);
}
server_limit = MAX_SERVER_LIMIT;
}
else if (server_limit < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00302)
"WARNING: ServerLimit of %d not allowed, "
"increasing to 1.", server_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00303)
"ServerLimit of %d not allowed, increasing to 1",
server_limit);
}
server_limit = 1;
}
if (!retained->first_server_limit) {
retained->first_server_limit = server_limit;
}
else if (server_limit != retained->first_server_limit) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00304)
"changing ServerLimit to %d from original value of %d "
"not allowed during restart",
server_limit, retained->first_server_limit);
server_limit = retained->first_server_limit;
}
if (thread_limit > MAX_THREAD_LIMIT) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00305)
"WARNING: ThreadLimit of %d exceeds compile-time "
"limit of", thread_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d threads, decreasing to %d.",
MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00306)
"ThreadLimit of %d exceeds compile-time limit "
"of %d, decreasing to match",
thread_limit, MAX_THREAD_LIMIT);
}
thread_limit = MAX_THREAD_LIMIT;
}
else if (thread_limit < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00307)
"WARNING: ThreadLimit of %d not allowed, "
"increasing to 1.", thread_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00308)
"ThreadLimit of %d not allowed, increasing to 1",
thread_limit);
}
thread_limit = 1;
}
if (!retained->first_thread_limit) {
retained->first_thread_limit = thread_limit;
}
else if (thread_limit != retained->first_thread_limit) {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00309)
"changing ThreadLimit to %d from original value of %d "
"not allowed during restart",
thread_limit, retained->first_thread_limit);
thread_limit = retained->first_thread_limit;
}
if (threads_per_child > thread_limit) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00310)
"WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
"of", threads_per_child);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d threads, decreasing to %d.",
thread_limit, thread_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" To increase, please see the ThreadLimit "
"directive.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00311)
"ThreadsPerChild of %d exceeds ThreadLimit "
"of %d, decreasing to match",
threads_per_child, thread_limit);
}
threads_per_child = thread_limit;
}
else if (threads_per_child < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00312)
"WARNING: ThreadsPerChild of %d not allowed, "
"increasing to 1.", threads_per_child);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00313)
"ThreadsPerChild of %d not allowed, increasing to 1",
threads_per_child);
}
threads_per_child = 1;
}
if (max_workers < threads_per_child) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00314)
"WARNING: MaxRequestWorkers of %d is less than "
"ThreadsPerChild of", max_workers);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d, increasing to %d. MaxRequestWorkers must be at "
"least as large",
threads_per_child, threads_per_child);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" as the number of threads in a single server.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00315)
"MaxRequestWorkers of %d is less than ThreadsPerChild "
"of %d, increasing to match",
max_workers, threads_per_child);
}
max_workers = threads_per_child;
}
ap_daemons_limit = max_workers / threads_per_child;
if (max_workers % threads_per_child) {
int tmp_max_workers = ap_daemons_limit * threads_per_child;
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00316)
"WARNING: MaxRequestWorkers of %d is not an integer "
"multiple of", max_workers);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" ThreadsPerChild of %d, decreasing to nearest "
"multiple %d,", threads_per_child,
tmp_max_workers);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" for a maximum of %d servers.",
ap_daemons_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00317)
"MaxRequestWorkers of %d is not an integer multiple of "
"ThreadsPerChild of %d, decreasing to nearest "
"multiple %d", max_workers, threads_per_child,
tmp_max_workers);
}
max_workers = tmp_max_workers;
}
if (ap_daemons_limit > server_limit) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00318)
"WARNING: MaxRequestWorkers of %d would require %d "
"servers and ", max_workers, ap_daemons_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" would exceed ServerLimit of %d, decreasing to %d.",
server_limit, server_limit * threads_per_child);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" To increase, please see the ServerLimit "
"directive.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00319)
"MaxRequestWorkers of %d would require %d servers and "
"exceed ServerLimit of %d, decreasing to %d",
max_workers, ap_daemons_limit, server_limit,
server_limit * threads_per_child);
}
ap_daemons_limit = server_limit;
}
if (ap_daemons_to_start < 0) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00320)
"WARNING: StartServers of %d not allowed, "
"increasing to 1.", ap_daemons_to_start);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00321)
"StartServers of %d not allowed, increasing to 1",
ap_daemons_to_start);
}
ap_daemons_to_start = 1;
}
if (min_spare_threads < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00322)
"WARNING: MinSpareThreads of %d not allowed, "
"increasing to 1", min_spare_threads);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" to avoid almost certain server failure.");
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" Please read the documentation.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00323)
"MinSpareThreads of %d not allowed, increasing to 1",
min_spare_threads);
}
min_spare_threads = 1;
}
return OK;
}
static void worker_hooks(apr_pool_t *p)
{
static const char *const aszSucc[] = {"core.c", NULL};
one_process = 0;
ap_hook_open_logs(worker_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
ap_hook_pre_config(worker_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
ap_hook_check_config(worker_check_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm(worker_run, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_query(worker_query, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_get_name(worker_get_name, NULL, NULL, APR_HOOK_MIDDLE);
}
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);
return NULL;
}
static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
max_spare_threads = atoi(arg);
return NULL;
}
static const char *set_max_workers (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(cmd->cmd->name, "MaxClients")) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00324)
"MaxClients is deprecated, use MaxRequestWorkers "
"instead.");
}
max_workers = atoi(arg);
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;
}
threads_per_child = 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;
}
server_limit = atoi(arg);
return NULL;
}
static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
thread_limit = atoi(arg);
return NULL;
}
static const command_rec worker_cmds[] = {
LISTEN_COMMANDS,
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 threads, to handle request spikes"),
AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
"Maximum number of idle threads"),
AP_INIT_TAKE1("MaxRequestWorkers", set_max_workers, NULL, RSRC_CONF,
"Maximum number of threads alive at the same time"),
AP_INIT_TAKE1("MaxClients", set_max_workers, NULL, RSRC_CONF,
"Deprecated name of MaxRequestWorkers"),
AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
"Number of threads each child creates"),
AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
"Maximum number of child processes for this run of Apache"),
AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
"Maximum number of worker threads per child process for this run of Apache - Upper limit for ThreadsPerChild"),
AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
{ NULL }
};
AP_DECLARE_MODULE(mpm_worker) = {
MPM20_MODULE_STUFF,
NULL,
NULL,
NULL,
NULL,
NULL,
worker_cmds,
worker_hooks
};