ngx_int_t
ngx_http_echo_exec_echo_blocking_sleep(ngx_http_request_t *r,
ngx_http_echo_ctx_t *ctx, ngx_array_t *computed_args)
{
ngx_str_t *computed_arg;
ngx_str_t *computed_arg_elts;
float delay; /* in sec */
computed_arg_elts = computed_args->elts;
computed_arg = &computed_arg_elts[0];
delay = atof( (char*) computed_arg->data );
if (delay < 0.001) { /* should be bigger than 1 msec */
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"invalid sleep duration \"%V\"", &computed_arg_elts[0]);
return NGX_HTTP_BAD_REQUEST;
}
dd("blocking DELAY = %.02lf sec", delay);
ngx_msleep((ngx_msec_t) (1000 * delay));
return NGX_OK;
}
ngx_int_t
ngx_http_echo_exec_echo_blocking_sleep(ngx_http_request_t *r,
ngx_http_echo_ctx_t *ctx, ngx_array_t *computed_args)
{
ngx_str_t *computed_arg;
ngx_str_t *computed_arg_elts;
ngx_int_t delay; /* in msec */
computed_arg_elts = computed_args->elts;
computed_arg = &computed_arg_elts[0];
delay = ngx_atofp(computed_arg->data, computed_arg->len, 3);
if (delay == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"invalid sleep duration \"%V\"", &computed_arg_elts[0]);
return NGX_HTTP_BAD_REQUEST;
}
dd("blocking delay: %lu ms", (unsigned long) delay);
ngx_msleep((ngx_msec_t) delay);
return NGX_OK;
}
static ngx_int_t
ngx_http_file_cache_manager_sleep(ngx_http_file_cache_t *cache)
{
ngx_msec_t elapsed;
if (cache->files++ > 100) {
ngx_time_update();
elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last));
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache manager time: %M", elapsed);
if (elapsed > 200) {
/*
* if processing 100 files takes more than 200ms,
* it seems that many operations require disk i/o,
* therefore sleep 200ms
*/
ngx_msleep(200);
ngx_time_update();
}
cache->last = ngx_current_msec;
cache->files = 0;
}
return (ngx_quit || ngx_terminate) ? NGX_ABORT : NGX_OK;
}
static ngx_thread_value_t __stdcall
ngx_cache_loader_thread(void *data)
{
ngx_uint_t i;
ngx_path_t **path;
ngx_cycle_t *cycle;
ngx_msleep(60000);
cycle = (ngx_cycle_t *) ngx_cycle;
path = cycle->paths.elts;
for (i = 0; i < cycle->paths.nelts; i++) {
if (ngx_terminate || ngx_quit || ngx_exiting) {
break;
}
if (path[i]->loader) {
path[i]->loader(path[i]->data);
ngx_time_update();
}
}
return 0;
}
static void
ngx_http_file_cache_loader_sleep(ngx_http_file_cache_t *cache)
{
ngx_msleep(cache->loader_sleep);
ngx_time_update();
cache->last = ngx_current_msec;
cache->files = 0;
}
static void ngx_proc_luashm_backup_thread_cycle(void *data)
{
ngx_proc_luashm_backup_conf_t *pbcf;
ngx_cycle_t *cycle;
ngx_shm_zone_t *zone;
ngx_str_t *name;
ngx_uint_t i;
ngx_time_t *tp;
int64_t now,settimestamp;
cycle = data;
pbcf = ngx_proc_get_conf(cycle->conf_ctx, ngx_proc_luashm_backup_module);
if(pbcf->settimestamp.data == NULL){
pthread_exit((void *)0);
return;
}
while(pbcf->running){
ngx_time_update();
if(ngx_strstr(pbcf->settimestamp.data,":")==NULL){
settimestamp=ngx_atoi(pbcf->settimestamp.data,pbcf->settimestamp.len);
}else{
tp = ngx_timeofday();
now = (int64_t) tp->sec * 1000 + tp->msec;
settimestamp=GetTick((char*)pbcf->settimestamp.data)*1000;
ngx_log_error(NGX_LOG_DEBUG, ngx_cycle->log, 0, "========= now:%lu, settimestamp:%lu =========",now,settimestamp);
if(settimestamp<now)
settimestamp=(24*60*60*1000)-(now-settimestamp);
else
settimestamp=settimestamp-now;
if(settimestamp==0)settimestamp=1;
}
ngx_log_error(NGX_LOG_DEBUG, ngx_cycle->log, 0, "========= backup time:%s, sleeptime:%lu =========",pbcf->settimestamp.data,settimestamp);
ngx_msleep(settimestamp);
if(!pbcf->running)break;
i = 0;
for (; i < pbcf->shdict_names->nelts;i++)
{
name = ((ngx_str_t*)pbcf->shdict_names->elts) + i;
zone = ngx_http_lua_find_zone(name->data,name->len);
dd("shm.name:%s,shm.name_len:%ld,shm.size:%ld ", name->data,name->len,zone->shm.size);
ngx_proc_luashm_backup_backup(cycle,zone);
}
ngx_log_error(NGX_LOG_DEBUG, cycle->log, 0, "luashm_backup %V",&ngx_cached_http_time);
ngx_sleep(60);
if(!pbcf->running)break;
}
pthread_exit((void *)0);
}
static ngx_int_t ngx_http_mongo_reconnect(ngx_log_t *log, ngx_http_mongo_connection_t *mongo_conn) {
volatile int status = MONGO_CONN_FAIL;
if (&mongo_conn->conn.connected) {
mongo_disconnect(&mongo_conn->conn);
ngx_msleep(MONGO_RECONNECT_WAITTIME);
status = mongo_reconnect(&mongo_conn->conn);
} else {
status = MONGO_CONN_FAIL;
}
switch (status) {
case MONGO_CONN_SUCCESS:
break;
case MONGO_CONN_NO_SOCKET:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: No Socket");
return NGX_ERROR;
case MONGO_CONN_FAIL:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Connection Failure %s:%i;",
mongo_conn->conn.primary->host,
mongo_conn->conn.primary->port);
return NGX_ERROR;
case MONGO_CONN_ADDR_FAIL:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: getaddrinfo Failure");
return NGX_ERROR;
case MONGO_CONN_NOT_MASTER:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Not Master");
return NGX_ERROR;
default:
ngx_log_error(NGX_LOG_ERR, log, 0,
"Mongo Exception: Unknown Error");
return NGX_ERROR;
}
return NGX_OK;
}
ngx_int_t ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
ngx_uint_t tries, failed, reuseaddr, i;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_listening_t *ls;
reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
failed = 0;
#endif
log = cycle->log;
/* TODO: tries configurable */
for (tries = /* STUB */ 5; tries; tries--)
{
failed = 0;
/* for each listening socket */
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++)
{
if (ls[i].ignore)
{
continue;
}
if (ls[i].fd != -1)
{
continue;
}
if (ls[i].inherited)
{
/* TODO: close on exit */
/* TODO: nonblocking */
/* TODO: deferred accept */
continue;
}
s = ngx_socket(ls[i].family, ls[i].type, ls[i].protocol,
ls[i].flags);
if (s == -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %s failed", ls[i].addr_text.data);
return NGX_ERROR;
}
#if (WIN32)
/*
* Winsock assignes a socket number divisible by 4
* so to find a connection we divide a socket number by 4.
*/
if (s % 4)
{
ngx_log_error(NGX_LOG_EMERG, ls->log, 0,
ngx_socket_n " created socket %d", s);
return NGX_ERROR;
}
#endif
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int)) == -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %s failed",
ls[i].addr_text.data);
return NGX_ERROR;
}
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_AIO_EVENT))
{
if (ngx_nonblocking(s) == -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %s failed",
ls[i].addr_text.data);
return NGX_ERROR;
}
}
#if 0
if (ls[i].nonblocking)
{
if (ngx_nonblocking(s) == -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %s failed",
ls[i].addr_text.data);
return NGX_ERROR;
}
}
#endif
if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1)
{
err = ngx_socket_errno;
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %s failed", ls[i].addr_text.data);
if (err != NGX_EADDRINUSE)
return NGX_ERROR;
if (ngx_close_socket(s) == -1)
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %s failed",
ls[i].addr_text.data);
failed = 1;
continue;
}
if (listen(s, ls[i].backlog) == -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %s failed", ls[i].addr_text.data);
return NGX_ERROR;
}
/* TODO: deferred accept */
ls[i].fd = s;
}
if (!failed)
break;
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed)
{
ngx_log_error(NGX_LOG_EMERG, log, 0, "still can not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
//监听，绑定cycle中listening动态数组指定的相应端口
//cycle是当前进程的ngx_cycle_t结构体指针
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
int reuseaddr;
ngx_uint_t i, tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_listening_t *ls;
reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
failed = 0;
#endif
log = cycle->log;
/* TODO: configurable try number */
for (tries = 5; tries; tries--) {
failed = 0;
/* for each listening socket */
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
if (ls[i].ignore) {
continue;
}
if (ls[i].fd != (ngx_socket_t) -1) {
continue;
}
if (ls[i].inherited) {
/* TODO: close on exit */
/* TODO: nonblocking */
/* TODO: deferred accept */
continue;
}
s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);
if (s == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls[i].addr_text);
return NGX_ERROR;
}
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
if (ls[i].sockaddr->sa_family == AF_INET6) {
int ipv6only;
ipv6only = ls[i].ipv6only;
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
(const void *) &ipv6only, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(IPV6_V6ONLY) %V failed, ignored",
&ls[i].addr_text);
}
}
#endif
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
"bind() %V #%d ", &ls[i].addr_text, s);
if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
err = ngx_socket_errno;
if (err != NGX_EADDRINUSE || !ngx_test_config) {
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %V failed", &ls[i].addr_text);
}
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
if (!ngx_test_config) {
failed = 1;
}
continue;
}
#if (NGX_HAVE_UNIX_DOMAIN)
if (ls[i].sockaddr->sa_family == AF_UNIX) {
mode_t mode;
u_char *name;
name = ls[i].addr_text.data + sizeof("unix:") - 1;
mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
if (chmod((char *) name, mode) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
"chmod() \"%s\" failed", name);
}
if (ngx_test_config) {
if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
ngx_delete_file_n " %s failed", name);
}
}
}
#endif
if (listen(s, ls[i].backlog) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %V, backlog %d failed",
&ls[i].addr_text, ls[i].backlog);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
ls[i].listen = 1;
ls[i].fd = s;
}
if (!failed) {
break;
}
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed) {
ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
ngx_setproctitle(title);
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
sigsuspend(&set);
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
live = ngx_reap_children(cycle);
}
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle);
}
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
if (ngx_reconfigure) {
ngx_reconfigure = 0;
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
ngx_msleep(100);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
int reuseaddr;
ngx_uint_t i, tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_listening_t *ls;
reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
failed = 0;
#endif
log = cycle->log;
/* TODO: configurable try number */
for (tries = 5; tries; tries--) {
failed = 0;
/* for each listening socket */
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
if (ls[i].ignore) {
continue;
}
if (ls[i].fd != -1) {
continue;
}
if (ls[i].inherited) {
/* TODO: close on exit */
/* TODO: nonblocking */
/* TODO: deferred accept */
continue;
}
s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);
if (s == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls[i].addr_text);
return NGX_ERROR;
}
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %V failed",
&ls[i].addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"bind() %V #%d ", &ls[i].addr_text, s);
if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
err = ngx_socket_errno;
if (err == NGX_EADDRINUSE && ngx_test_config) {
continue;
}
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %V failed", &ls[i].addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
failed = 1;
continue;
}
if (listen(s, ls[i].backlog) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %V, backlog %d failed",
&ls[i].addr_text, ls[i].backlog);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
ls[i].listen = 1;
ls[i].fd = s;
}
if (!failed) {
break;
}
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed) {
ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
// http://www.xuebuyuan.com/557917.html
// http://blog.csdn.net/lu_ming/article/details/5144427
// http://blog.csdn.net/lengzijian/article/details/7587740
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
// block these signals
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
// set title = "master process" + argv[0] + argv[1] + ...
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
ngx_setproctitle(title);
// Start workers and cache_manager
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
// sigsuspend() temporarily replaces the signal mask of the calling
// process with the mask given by mask and then suspends the process
// until delivery of a signal whose action is to invoke a
// signal handler or to terminate a process.
sigsuspend(&set);
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
live = ngx_reap_children(cycle);
}
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle);
}
// on SIGINT set ngx_terminate = 1
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
if (ngx_reconfigure) {
ngx_reconfigure = 0;
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
// Nginx won't guarantee the new workers will be ready to accept
// new connections before sending shutdown signals to old workers.
// If the new works takes more than 100ms to startup, then there is
// a risk that the old workers are shutdown but new workers are still
// not ready, as a result, new connections will be pending until a new
// worker is ready to handle.
/* allow new processes to start */
ngx_msleep(100);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
// main()函数里调用，启动worker进程
// 监听信号
// 核心操作是sigsuspend，暂时挂起进程，不占用CPU，只有收到信号时才被唤醒
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
// 添加master进程关注的信号
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
// static u_char master_process[] = "master process";
// 计算master进程的名字
size = sizeof(master_process);
// 加上命令行参数，注意使用的是nginx拷贝后的参数
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
// 分配名字的内存
title = ngx_pnalloc(cycle->pool, size);
if (title == NULL) {
/* fatal */
exit(2);
}
// 拷贝字符串
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
// 设置进程名
ngx_setproctitle(title);
// 取core模块配置
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
// 启动worker进程，数量由配置决定，即worker_processes指令
// #define NGX_PROCESS_RESPAWN -3
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
// cache进程
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0; //延时的计数器
sigio = 0;
live = 1; //是否有存活的子进程
// master进程的无限循环，只处理信号
// 主要调用ngx_signal_worker_processes()发送信号
// ngx_start_worker_processes()产生新子进程
for ( ;; ) {
// 延时等待子进程关闭，每次进入加倍等待
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2; //延时加倍
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
// 系统调用，设置发送SIGALRM的时间间隔
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
// 核心操作是sigsuspend，暂时挂起进程，不占用CPU，只有收到信号时才被唤醒
// 收到SIGALRM就检查子进程是否都已经处理完了
sigsuspend(&set);
// 更新一下时间
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
// 子进程可能发生了意外结束
// 在os/unix/ngx_process.c ngx_signal_handler()里设置
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
// 重新产生子进程
live = ngx_reap_children(cycle);
}
// 无存活子进程且收到stop/quit信号
if (!live && (ngx_terminate || ngx_quit)) {
// 删除pid，模块清理，关闭监听端口
// 内部直接exit(0)退出
ngx_master_process_exit(cycle);
}
// 收到了-s stop，停止进程
if (ngx_terminate) {
// 延时等待子进程关闭
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
// 超时太多，直接发送SIGKILL杀死进程
// master进程调用，遍历ngx_processes数组，用kill发送信号
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
// master进程调用，遍历ngx_processes数组，用kill发送信号
// 走到worker进程的ngx_signal_handler()
// 然后再是ngx_worker_process_cycle()的ngx_terminate
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
// 等待SIGALRM信号，检查子进程是否都结束
continue;
}
// 收到了-s quit，关闭监听端口后再停止进程（优雅关闭）
if (ngx_quit) {
// master进程调用，遍历ngx_processes数组，用kill发送信号
// 走到worker进程的ngx_signal_handler()
// 然后再是ngx_worker_process_cycle()的ngx_quit
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
// 关闭所有监听端口
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
// 收到了-s reload重新配置
if (ngx_reconfigure) {
ngx_reconfigure = 0;
// 启动新的nginx二进制
if (ngx_new_binary) {
// 启动worker进程，数量由配置决定，即worker_processes指令
// 调用时传递的是#define NGX_PROCESS_RESPAWN -3
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
// nginx可执行程序不变，以当前cycle重新初始化
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
// 启动worker进程，数量由配置决定，即worker_processes指令
// 调用时传递的是#define NGX_PROCESS_JUST_RESPAWN -2
// 这样新启动的进程不会发送shutdown信号
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
// 阻塞等待100毫秒
ngx_msleep(100);
// 设置进程存活标志
live = 1;
// 关闭原来的worker进程
// 新启动的进程不会发送shutdown信号
// master进程调用，遍历ngx_processes数组，用kill发送信号
// 走到worker进程的ngx_signal_handler()
// 然后再是ngx_worker_process_cycle()的ngx_quit
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
ngx_restart = 0;
// 启动worker进程，数量由配置决定，即worker_processes指令
// 调用时传递的是#define NGX_PROCESS_RESPAWN -3
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
// 设置进程存活标志
live = 1;
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
} //master进程无限循环结束
}
ngx_int_t
ngx_tcp_open_listening_socket(ngx_listening_t *ls)
{
int reuseaddr;
ngx_uint_t tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
reuseaddr = 1;
log = ls->logp;
for (tries = 5; tries; tries--) {
failed = 0;
if (ls->ignore) {
continue;
}
if (ls->fd != -1) {
break;
}
s = ngx_socket(ls->sockaddr->sa_family, ls->type, 0);
if (s == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls->addr_text);
return NGX_ERROR;
}
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %V failed",
&ls->addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls->addr_text);
}
return NGX_ERROR;
}
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
if (ls->sockaddr->sa_family == AF_INET6) {
int ipv6only;
ipv6only = ls->ipv6only;
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
(const void *) &ipv6only, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(IPV6_V6ONLY) %V failed, ignored",
&ls->addr_text);
}
}
#endif
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %V failed",
&ls->addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls->addr_text);
}
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
"bind() %V #%d ", &ls->addr_text, s);
#if (NGX_HAVE_UNIX_DOMAIN)
{
u_char *name;
name = ls->addr_text.data + sizeof("unix:") - 1;
unlink((const char *)name);
}
#endif
if (bind(s, ls->sockaddr, ls->socklen) == -1) {
err = ngx_socket_errno;
if (err == NGX_EADDRINUSE && ngx_test_config) {
continue;
}
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %V failed", &ls->addr_text);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls->addr_text);
}
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
failed = 1;
break;
}
#if (NGX_HAVE_UNIX_DOMAIN)
if (ls->sockaddr->sa_family == AF_UNIX) {
mode_t mode;
u_char *name;
name = ls->addr_text.data + sizeof("unix:") - 1;
mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
if (chmod((char *) name, mode) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
"chmod() \"%s\" failed", name);
}
if (ngx_test_config) {
if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
ngx_delete_file_n " %s failed", name);
}
}
}
#endif
if (listen(s, ls->backlog) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %V, backlog %d failed",
&ls->addr_text, ls->backlog);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls->addr_text);
}
return NGX_ERROR;
}
ls->listen = 1;
ls->fd = s;
if (!failed) {
break;
}
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed) {
ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
static void
ngx_procs_cycle(ngx_cycle_t *cycle, void *data)
{
ngx_int_t rc;
ngx_uint_t i;
ngx_module_t *module;
ngx_proc_args_t *args;
ngx_proc_conf_t *cpcf;
ngx_connection_t *c;
ngx_proc_module_t *ctx;
args = data;
module = args->module;
cpcf = args->proc_conf;
ctx = module->ctx;
ngx_process = NGX_PROCESS_PROC;
ngx_setproctitle((char *) ctx->name.data);
ngx_msleep(cpcf->delay_start);
ngx_procs_process_init(cycle, ctx, cpcf->priority);
ngx_close_listening_sockets(cycle);
ngx_use_accept_mutex = 0;
for ( ;; ) {
if (ngx_exiting || ngx_quit) {
ngx_exiting = 1;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"process %V gracefully shutting down", &ctx->name);
ngx_setproctitle("processes are shutting down");
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
if (c[i].fd != -1 && c[i].idle) {
c[i].close = 1;
c[i].read->handler(c[i].read);
}
}
ngx_procs_process_exit(cycle, ctx);
}
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "process %V exiting",
&ctx->name);
ngx_procs_process_exit(cycle, ctx);
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, -1);
}
if (ctx->loop) {
rc = ctx->loop(cycle);
if (rc != NGX_OK) {
break;
}
}
ngx_time_update();
ngx_process_events_and_timers(cycle);
}
ngx_procs_process_exit(cycle, ctx);
}
/*
* 主要工作：
* 主进程设置信号堵塞
* 设置进程标题
* 启动worker进程
* 启动缓存索引重建（cache loader）进程及管理（Cache Manager）进程
* 主进程循环处理信号
* */
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay; /*保存的是等待工作进程退出的时间*/
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
/*将下列信号添加到信号集set中*/
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
/*将信号集set覆盖为当前进程的信号集*/
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
/*开始设置进程标题*/
/*计算进程标题的总体长度*/
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
if (title == NULL) {
/* fatal */
exit(2);
}
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
/*设置进程标题*/
ngx_setproctitle(title);
/*获取核心模块上下文*/
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
/*启动工作进程*/
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
/*启动缓存索引重建进程，该进程在整个Nginx服务器运行过程中只存在很短的时间，主要用来遍历磁盘上的缓存数据，在内存中建立数据索引，提高Nginx服务器检索缓存的效率*/
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
if (delay) {
/*等待工作进程退出的时间*/
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %M", delay);
/*初始化一个定时器*/
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
/*挂起进程，等待接收到信号，在不向主进程发送信号的情况下，该进程将一直挂起在这里等待*/
sigsuspend(&set);
/*更新缓冲时间*/
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
/*如果有工作进程异常退出，则调用ngx_reap_children()重启该工作进程*/
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
/*重启工作进程*/
live = ngx_reap_children(cycle);
}
/*如果主进程接收到的是NGX_CMD_TERMINATE信号、SIGTERM信号、SIGINT信号（ngx_terminate=1）或者收到的是NGX_CMD_QUIT信号、SIGQUIT信号（ngx_quit=1），并且工作进程退出，则主进程调用ngx_master_process_exit()函数退出*/
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle);
}
/*处理SIGINT信号*/
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
/*包括两个管理内存索引的进程*/
sigio = ccf->worker_processes + 2 /* cache processes */;
/*超时1s，直接终止工作进程*/
if (delay > 1000) {
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
/*工作进程正常退出*/
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
/*处理SIGQUIT信号*/
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
/*关闭所有的socket*/
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
/*处理SIGHUP信号*/
if (ngx_reconfigure) {
ngx_reconfigure = 0;
/*热升级（平滑升级，不用停止服务）*/
/*当ngx_new_binary=1时，说明主进程本身需要升级，但是不需要重新初始化Nginx配置，因此可以直接调用ngx_start_worker_processes()函数重启工作进程和缓存索引管理进程*/
/*当ngx_new_binary!=1时，则说明时Nginx服务器配置改变，需要调用ngx_init_cycle()函数初始化Nginx配置，并按照新的配置启动工作进程和缓存索引管理进程，向之前的所有进程发送NGX_SHUTDOWN_SIGNAL信号，这样旧实现了Nginx服务器的平滑升级*/
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
/*建立信的cycle结构*/
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
/*读取Nginx配置*/
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
/*创建工作进程*/
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
/*创建缓存管理进程*/
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
ngx_msleep(100);
live = 1;
/*关闭旧的Nginx进程*/
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
/*重启工作进程*/
/*只有一种情况可以将ngx_restart变量赋值为1，就是在调用ngx_reap_children()函数重启工作进程的时候，当主进程接收到NGX_NOACCEPT_SIGNAL信号（不再接收请求，退出工作进程）时，会设置全局变量ngx_noaccept为1，然后再Nginx初始化信号设置时会将全局变量ngx_noaccepting设置为1，于是在ngx_reap_children()函数中就会将ngx_restart变量设置为1，进而执行下面的if语句中的代码，重启工作进程和缓存索引管理进程*/
if (ngx_restart) {
ngx_restart = 0;
/*启动工作进程*/
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
/*启动缓存索引管理进程刷新缓存索引*/
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
/*处理SIGUSR1信号，该信号用于重新打开日志文件*/
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
/*处理SIGUSR2信号，热代码切换*/
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
/*处理NGX_NOACCEPT_SIGNAL信号*/
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
/*退出工作进程，不再接收网络请求*/
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
ngx_int_t
ngx_open_listening_sockets(ngx_cycle_t *cycle)
{
int reuseaddr;
ngx_uint_t i, tries, failed;
ngx_err_t err;
ngx_log_t *log;
ngx_socket_t s;
ngx_listening_t *ls;
reuseaddr = 1;
#if (NGX_SUPPRESS_WARN)
failed = 0;
#endif
log = cycle->log;
/* TODO: configurable try number */
for (tries = 5; tries; tries--) { //bind和listen最多从实5次
failed = 0;
/* for each listening socket */
ls = cycle->listening.elts;
for (i = 0; i < cycle->listening.nelts; i++) {
if (ls[i].ignore) {
continue;
}
#if (NGX_HAVE_REUSEPORT)
if (ls[i].add_reuseport) {
/*
* to allow transition from a socket without SO_REUSEPORT
* to multiple sockets with SO_REUSEPORT, we have to set
* SO_REUSEPORT on the old socket before opening new ones
*/
int reuseport = 1;
if (setsockopt(ls[i].fd, SOL_SOCKET, SO_REUSEPORT,
(const void *) &reuseport, sizeof(int)) //端口复用需要内核支持
== -1)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_socket_errno,
"setsockopt(SO_REUSEPORT) %V failed, ignored",
&ls[i].addr_text);
}
ls[i].add_reuseport = 0;
}
#endif
if (ls[i].fd != (ngx_socket_t) -1) {
continue;
}
if (ls[i].inherited) {
/* TODO: close on exit */
/* TODO: nonblocking */
/* TODO: deferred accept */
continue;
}
s = ngx_socket(ls[i].sockaddr->sa_family, ls[i].type, 0);
if (s == (ngx_socket_t) -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_socket_n " %V failed", &ls[i].addr_text);
return NGX_ERROR;
}
/*
默认情况下,server重启,调用socket,bind,然后listen,会失败.因为该端口正在被使用.如果设定SO_REUSEADDR,那么server重启才会成功.因此,
所有的TCP server都必须设定此选项,用以应对server重启的现象.
*/
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(const void *) &reuseaddr, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEADDR) %V failed, close sock:%d",
&ls[i].addr_text, s);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
#if (NGX_HAVE_REUSEPORT)
if (ls[i].reuseport) {
int reuseport;
reuseport = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT,
(const void *) &reuseport, sizeof(int)) //端口复用需要内核支持
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(SO_REUSEPORT) %V failed, ignored, close sock:%d",
&ls[i].addr_text, s);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
}
#endif
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
if (ls[i].sockaddr->sa_family == AF_INET6) {
int ipv6only;
ipv6only = ls[i].ipv6only;
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
(const void *) &ipv6only, sizeof(int))
== -1)
{
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"setsockopt(IPV6_V6ONLY) %V failed, ignored",
&ls[i].addr_text);
}
}
#endif
/* TODO: close on exit */
if (!(ngx_event_flags & NGX_USE_IOCP_EVENT)) {
if (ngx_nonblocking(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_nonblocking_n " %V failed, close sock:%d",
&ls[i].addr_text,s);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
"bind() %V #%d ", &ls[i].addr_text, s);
if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
err = ngx_socket_errno;
if (err != NGX_EADDRINUSE || !ngx_test_config) {
ngx_log_error(NGX_LOG_EMERG, log, err,
"bind() to %V failed", &ls[i].addr_text);
}
ngx_log_error(NGX_LOG_EMERG, log, err,
"close socket:%d", s);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
if (err != NGX_EADDRINUSE) {
return NGX_ERROR;
}
if (!ngx_test_config) {
failed = 1;
}
continue;
}
#if (NGX_HAVE_UNIX_DOMAIN)
if (ls[i].sockaddr->sa_family == AF_UNIX) {
mode_t mode;
u_char *name;
name = ls[i].addr_text.data + sizeof("unix:") - 1;
mode = (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
if (chmod((char *) name, mode) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
"chmod() \"%s\" failed", name);
}
if (ngx_test_config) {
if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
ngx_delete_file_n " %s failed", name);
}
}
}
#endif
if (listen(s, ls[i].backlog) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
"listen() to %V, backlog %d failed",
&ls[i].addr_text, ls[i].backlog);
ngx_log_error(NGX_LOG_EMERG, log, err, "close socket:%d", s);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[i].addr_text);
}
return NGX_ERROR;
}
ls[i].listen = 1;
ls[i].fd = s;
}
if (!failed) {
break;
}
/* TODO: delay configurable */
ngx_log_error(NGX_LOG_NOTICE, log, 0,
"try again to bind() after 500ms");
ngx_msleep(500);
}
if (failed) {
ngx_log_error(NGX_LOG_EMERG, log, 0, "still could not bind()");
return NGX_ERROR;
}
return NGX_OK;
}
// 启动后master进程在这个函数进入死循环
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
// 让master进程只有在sigsuspend()里才会捕捉参数set里的信号。
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
// 设置ps命令显示的进程标题
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
ngx_setproctitle(title);
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
// 启动worker进程
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
// 配置文件配置了相关功能时打开cache manager或cache loader进程,
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1;
for ( ;; ) {
if (delay) {
// 收到退出信号后会使用这个分支，
// 作用是定时检查是否还有活跃子进程，如果没有就退出master进程
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
// 当没有收到信号时进程会在这个函数里休眠, 当收到信号后如果有信号处理函数先运行信号处理函数，
// 然后向下运行。
sigsuspend(&set);
// 更新记录当前时间的全局变量。
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
if (ngx_reap) {
// master进程的子进程结束时，master进程收到SIGCHLD信号后，ngx_reap被置1。
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
live = ngx_reap_children(cycle);
}
if (!live && (ngx_terminate || ngx_quit)) {
// 收到退出信号且已经没有活跃子进程后便退出
ngx_master_process_exit(cycle);
}
if (ngx_terminate) {
// 收到SIGINT,SIGTERM信号后，直接关闭nginx,
// 首先给子进程发送关闭信号，1秒还没有关完就强制关闭所有子进程
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
if (ngx_quit) {
// 收到SIGQUIT信号后，优雅关闭Nginx，
// 待所有worker进程将已经连接的请求处理完后在退出
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
if (ngx_reconfigure) {
// 收到SIGHUP信号后，ngx_reconfigure在信号处理函数中被置1，执行让新配置文件生效的操作。
ngx_reconfigure = 0;
if (ngx_new_binary) {
// 在不重新载入配置文件的情况下启动工作进程。
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
ngx_msleep(100);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
if (ngx_restart) {
// 好像是平滑升级时，新起的nginx意外退出了，要在把之前nginx的工作进程在重新启动
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
if (ngx_reopen) {
// 重新打开日志文件
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
if (ngx_change_binary) {
// 启动新的nignx,使新旧nginx同时工作
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
if (ngx_noaccept) {
// 收到sigwinch信号后优雅关闭所有子进程
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
/*
* master进程主循环
*/
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
char *title;
u_char *p;
size_t size;
ngx_int_t i;
ngx_uint_t n, sigio;
sigset_t set;
struct itimerval itv;
ngx_uint_t live;
ngx_msec_t delay;
ngx_listening_t *ls;
ngx_core_conf_t *ccf;
sigemptyset(&set);
sigaddset(&set, SIGCHLD);
sigaddset(&set, SIGALRM);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGINT);
sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
/* 进程屏蔽set中的信号 */
if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"sigprocmask() failed");
}
sigemptyset(&set);
size = sizeof(master_process);
for (i = 0; i < ngx_argc; i++) {
size += ngx_strlen(ngx_argv[i]) + 1;
}
title = ngx_pnalloc(cycle->pool, size);
if (title == NULL) {
/* fatal */
exit(2);
}
p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
for (i = 0; i < ngx_argc; i++) {
*p++ = ' ';
p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
}
/* 修改进程名 */
ngx_setproctitle(title);
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
/* 启动work进程 */
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_new_binary = 0;
delay = 0;
sigio = 0;
live = 1; /* 标记是否还有活着的子进程*/
for ( ;; ) {
//delay用来设置等待worker终止的时间，master接收了终止信号后
//首先发送终止信号给worker，然后等待work终止
if (delay) {
if (ngx_sigalrm) {
sigio = 0;
delay *= 2;
ngx_sigalrm = 0;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"termination cycle: %d", delay);
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = delay / 1000;
itv.it_value.tv_usec = (delay % 1000 ) * 1000;
/* 应为itv.it_interval 为0 定时器只触发一次 */
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");
/* 将进程的屏蔽信号集置空，然后进程挂起等待信号进入，信号处理程序处理完进入的信号后
恢复屏蔽信号集，最后sigsuspend返回 */
sigsuspend(&set);
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"wake up, sigio %i", sigio);
/* 当master收到work进程结束信号，回收子进程 */
if (ngx_reap) {
ngx_reap = 0;
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");
live = ngx_reap_children(cycle);
}
/* live为1表示有子进程在运行，为0代表，所有子进程都退出了 */
if (!live && (ngx_terminate || ngx_quit)) {
/* 没有子进程了 且收到终止或退出信号*/
ngx_master_process_exit(cycle);
}
/* master收到终止信号*/
if (ngx_terminate) {
if (delay == 0) {
delay = 50;
}
if (sigio) {
sigio--;
continue;
}
sigio = ccf->worker_processes + 2 /* cache processes */;
if (delay > 1000) {
/* 延时已到，给所有worker发送SIGKILL信号，强制杀死worker */
ngx_signal_worker_processes(cycle, SIGKILL);
} else {
/* 通知work进程终止 */
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_TERMINATE_SIGNAL));
}
continue;
}
/* 通知工作线程退出，并关闭所有监听套接口 */
if (ngx_quit) {
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
ls = cycle->listening.elts;
for (n = 0; n < cycle->listening.nelts; n++) {
if (ngx_close_socket(ls[n].fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
ngx_close_socket_n " %V failed",
&ls[n].addr_text);
}
}
cycle->listening.nelts = 0;
continue;
}
if (ngx_reconfigure) {
ngx_reconfigure = 0;
/* 代码已被替换，重启worker，不需要重新初始化配置。 */
if (ngx_new_binary) {
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
ngx_noaccepting = 0;
continue;
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
//重新初始化配置
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_JUST_RESPAWN);
ngx_start_cache_manager_processes(cycle, 1);
/* allow new processes to start */
ngx_msleep(100);
live = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
/* 重新创建work进程 当ngx_noaccepting==1时，会把ngx_restart设为1，重启worker */
if (ngx_restart) {
ngx_restart = 0;
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
ngx_start_cache_manager_processes(cycle, 0);
live = 1;
}
/* 从新打开日志文件 */
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, ccf->user);
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_REOPEN_SIGNAL));
}
/* 热替换 */
if (ngx_change_binary) {
ngx_change_binary = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
}
/* 通知work进程停止accept新连接,work进程退出 */
if (ngx_noaccept) {
ngx_noaccept = 0;
ngx_noaccepting = 1;
ngx_signal_worker_processes(cycle,
ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
}
}
}
static ngx_int_t
ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
ngx_uint_t flags)
{
int ready, nready;
ngx_err_t err;
ngx_uint_t i, found;
ngx_event_t *ev, **queue;
struct timeval tv, *tp;
ngx_connection_t *c;
#if (NGX_DEBUG)
if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
for (i = 0; i < nevents; i++) {
ev = event_index[i];
c = ev->data;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"select event: fd:%d wr:%d", c->fd, ev->write);
}
}
#endif
if (timer == NGX_TIMER_INFINITE) {
tp = NULL;
} else {
tv.tv_sec = (long) (timer / 1000);
tv.tv_usec = (long) ((timer % 1000) * 1000);
tp = &tv;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"select timer: %M", timer);
work_read_fd_set = master_read_fd_set;
work_write_fd_set = master_write_fd_set;
if (max_read || max_write) {
ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
} else {
/*
* Winsock select() requires that at least one descriptor set must be
* be non-null, and any non-null descriptor set must contain at least
* one handle to a socket. Otherwise select() returns WSAEINVAL.
*/
ngx_msleep(timer);
ready = 0;
}
err = (ready == -1) ? ngx_socket_errno : 0;
if (flags & NGX_UPDATE_TIME) {
ngx_time_update();
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"select ready %d", ready);
if (err) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
if (err == WSAENOTSOCK) {
ngx_select_repair_fd_sets(cycle);
}
return NGX_ERROR;
}
if (ready == 0) {
if (timer != NGX_TIMER_INFINITE) {
return NGX_OK;
}
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"select() returned no events without timeout");
return NGX_ERROR;
}
ngx_mutex_lock(ngx_posted_events_mutex);
nready = 0;
for (i = 0; i < nevents; i++) {
ev = event_index[i];
c = ev->data;
found = 0;
if (ev->write) {
if (FD_ISSET(c->fd, &work_write_fd_set)) {
found = 1;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"select write %d", c->fd);
}
} else {
if (FD_ISSET(c->fd, &work_read_fd_set)) {
found = 1;
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"select read %d", c->fd);
}
}
if (found) {
ev->ready = 1;
queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
&ngx_posted_events);
ngx_locked_post_event(ev, queue);
nready++;
}
}
ngx_mutex_unlock(ngx_posted_events_mutex);
if (ready != nready) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"select ready != events: %d:%d", ready, nready);
ngx_select_repair_fd_sets(cycle);
}
return NGX_OK;
}
void
ngx_master_process_cycle(ngx_cycle_t *cycle)
{
u_long nev, ev, timeout;
ngx_err_t err;
ngx_int_t n;
ngx_msec_t timer;
ngx_uint_t live;
HANDLE events[MAXIMUM_WAIT_OBJECTS];
ngx_process_init(cycle);
ngx_sprintf((u_char *) ngx_master_process_event_name,
"ngx_master_%s%Z", ngx_unique);
if (ngx_process == NGX_PROCESS_WORKER) {
if (FreeConsole() == 0) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"FreeConsole() failed");
}
ngx_worker_process_cycle(cycle, ngx_master_process_event_name);
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0, "master started");
ngx_console_init(cycle);
SetEnvironmentVariable("ngx_unique", ngx_unique);
ngx_master_process_event = CreateEvent(NULL, 1, 0,
ngx_master_process_event_name);
if (ngx_master_process_event == NULL) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"CreateEvent(\"%s\") failed",
ngx_master_process_event_name);
exit(2);
}
if (ngx_create_signal_events(cycle) != NGX_OK) {
exit(2);
}
ngx_sprintf((u_char *) ngx_cache_manager_mutex_name,
"ngx_cache_manager_mutex_%s%Z", ngx_unique);
ngx_cache_manager_mutex = CreateMutex(NULL, 0,
ngx_cache_manager_mutex_name);
if (ngx_cache_manager_mutex == NULL) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"CreateMutex(\"%s\") failed", ngx_cache_manager_mutex_name);
exit(2);
}
events[0] = ngx_stop_event;
events[1] = ngx_quit_event;
events[2] = ngx_reopen_event;
events[3] = ngx_reload_event;
// ngx_close_listening_sockets(cycle);
ngx_set_inherited_listen_sockets(cycle);
if (ngx_start_worker_processes(cycle, NGX_PROCESS_RESPAWN) == 0) {
exit(2);
}
timer = 0;
timeout = INFINITE;
for ( ;; ) {
nev = 4;
for (n = 0; n < ngx_last_process; n++) {
if (ngx_processes[n].handle) {
events[nev++] = ngx_processes[n].handle;
}
}
if (timer) {
timeout = timer > ngx_current_msec ? timer - ngx_current_msec : 0;
}
ev = WaitForMultipleObjects(nev, events, 0, timeout);
err = ngx_errno;
ngx_time_update();
ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"master WaitForMultipleObjects: %ul", ev);
if (ev == WAIT_OBJECT_0) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
if (ResetEvent(ngx_stop_event) == 0) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"ResetEvent(\"%s\") failed", ngx_stop_event_name);
}
if (timer == 0) {
timer = ngx_current_msec + 5000;
}
ngx_terminate = 1;
ngx_quit_worker_processes(cycle, 0);
continue;
}
if (ev == WAIT_OBJECT_0 + 1) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "shutting down");
if (ResetEvent(ngx_quit_event) == 0) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"ResetEvent(\"%s\") failed", ngx_quit_event_name);
}
ngx_quit = 1;
ngx_quit_worker_processes(cycle, 0);
continue;
}
if (ev == WAIT_OBJECT_0 + 2) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
if (ResetEvent(ngx_reopen_event) == 0) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"ResetEvent(\"%s\") failed",
ngx_reopen_event_name);
}
ngx_reopen_files(cycle, -1);
ngx_reopen_worker_processes(cycle);
continue;
}
if (ev == WAIT_OBJECT_0 + 3) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");
if (ResetEvent(ngx_reload_event) == 0) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"ResetEvent(\"%s\") failed",
ngx_reload_event_name);
}
/* 这个方案暂时已经可用了。不好的地方就是不能重启端口。如果端口配置有变化，就会有毛病。
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
//ngx_close_listening_sockets(cycle);
if (ngx_start_worker_processes(cycle, NGX_PROCESS_JUST_RESPAWN)) {
ngx_quit_worker_processes(cycle, 1);
}
*/
/*---code 这里代码是先退掉所有工作进程，然后关闭listen 端口，再reload 配置，重启端口，重启工作进程*/
ngx_quit_worker_processes(cycle, 0);
ngx_close_listening_sockets(cycle);
ngx_msleep(500);
cycle = ngx_init_cycle(cycle);
if (cycle == NULL) {
cycle = (ngx_cycle_t *) ngx_cycle;
continue;
}
ngx_cycle = cycle;
if (ngx_open_listening_sockets(cycle) != NGX_OK) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
"reload ngx_open_listening_sockets() failed");
ngx_quit = 1;
continue;
}
ngx_set_inherited_listen_sockets(cycle);
if (ngx_start_worker_processes(cycle, NGX_PROCESS_RESPAWN) == 0) {
exit(2);
}
/*---code --- end*/
continue;
}
if (ev > WAIT_OBJECT_0 + 3 && ev < WAIT_OBJECT_0 + nev) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0, "reap worker");
live = ngx_reap_worker(cycle, events[ev]);
if (!live && (ngx_terminate || ngx_quit)) {
ngx_master_process_exit(cycle);
}
continue;
}
if (ev == WAIT_TIMEOUT) {
ngx_terminate_worker_processes(cycle);
ngx_master_process_exit(cycle);
}
if (ev == WAIT_FAILED) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
"WaitForMultipleObjects() failed");
continue;
}
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"WaitForMultipleObjects() returned unexpected value %ul", ev);
}
}
void msleep(ngx_uint_t msec) const
{
ngx_msleep(msec);
}