/*工作进程的具体实现*/
static void
ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
/*实际是工作进程的序号*/
ngx_int_t worker = (intptr_t) data;
ngx_process = NGX_PROCESS_WORKER;
ngx_worker = worker;
/*工作进程初始化，主要是根据cycle中的信息初始化一些设置，以及将监听管道的handler加入到event中*/
ngx_worker_process_init(cycle, worker);
/*设置工作进程标题*/
ngx_setproctitle("worker process");
for ( ;; ) {
if (ngx_exiting) {
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
{
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
/*处理网络请求事件，这个函数是事件驱动机制的核心，既会处理普通的网络事件，也会处理定时器事件，它们分别被放在不同的事件队列种*/
ngx_process_events_and_timers(cycle);
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
if (ngx_quit) {
ngx_quit = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"gracefully shutting down");
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
ngx_exiting = 1;
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle);
}
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, -1);
}
}
}
static void
ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
ngx_int_t worker = (intptr_t) data;
ngx_process = NGX_PROCESS_WORKER;
ngx_worker = worker;
/* worker进程的初始化工作 */
ngx_worker_process_init(cycle, worker);
ngx_setproctitle("worker process");
/* worker进程的主循环 */
for ( ;; ) {
/* 处理nginx退出 */
if (ngx_exiting) {
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
{
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
/* 网络事件处理函数 */
ngx_process_events_and_timers(cycle);
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
if (ngx_quit) {
ngx_quit = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"gracefully shutting down");
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
ngx_exiting = 1;
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle);
}
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, -1);
}
}
}
static ngx_thread_value_t __stdcall
ngx_worker_thread(void *data)
{
ngx_int_t n;
ngx_cycle_t *cycle;
cycle = (ngx_cycle_t *) ngx_cycle;
for (n = 0; ngx_modules[n]; n++) {
if (ngx_modules[n]->init_process) {
if (ngx_modules[n]->init_process(cycle) == NGX_ERROR) {
/* fatal */
exit(2);
}
}
}
while (!ngx_quit) {
if (ngx_exiting) {
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root
== ngx_event_timer_rbtree.sentinel)
{
break;
}
}
ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0, "worker cycle");
ngx_process_events_and_timers(cycle);
if (ngx_terminate) {
return 0;
}
if (ngx_quit) {
ngx_quit = 0;
if (!ngx_exiting) {
ngx_exiting = 1;
ngx_close_listening_sockets(cycle);
ngx_close_idle_connections(cycle);
}
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_reopen_files(cycle, -1);
}
}
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
return 0;
}
static void
ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
ngx_int_t worker = (intptr_t) data;
ngx_uint_t i;
ngx_connection_t *c;
ngx_process = NGX_PROCESS_WORKER;
ngx_worker = worker;
ngx_worker_process_init(cycle, worker);
ngx_setproctitle("worker process");
for ( ;; ) {
if (ngx_exiting) {
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
/* THREAD: lock */
if (c[i].fd != -1 && c[i].idle) {
c[i].close = 1;
c[i].read->handler(c[i].read);
}
}
ngx_event_cancel_timers();
if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
{
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
ngx_process_events_and_timers(cycle);
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
ngx_worker_process_exit(cycle);
}
if (ngx_quit) {
ngx_quit = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"gracefully shutting down");
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
ngx_close_listening_sockets(cycle);
ngx_exiting = 1;
}
}
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, -1);
}
}
}
// 传递给ngx_spawn_process()，是worker进程的核心功能
// data实际上是进程号, (void *) (intptr_t) i
static void
ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
// 把data再转换为进程序号
ngx_int_t worker = (intptr_t) data;
ngx_uint_t i;
ngx_connection_t *c;
// 设置进程状态
ngx_process = NGX_PROCESS_WORKER;
// nginx 1.9.x
//ngx_worker = worker;
// 读取核心配置，设置cpu优先级,core dump信息,unix运行的group/user
// 切换工作路径,根据pid设置随机数种子
// 调用所有模块的init_process,让模块进程初始化
ngx_worker_process_init(cycle, worker);
// 设置进程名字
ngx_setproctitle("worker process");
// 无限循环，处理事件和信号
for ( ;; ) {
// 进程正在退出,即quit
// 收到了-s quit，关闭监听端口后再停止进程（优雅关闭）
if (ngx_exiting) {
c = cycle->connections;
for (i = 0; i < cycle->connection_n; i++) {
/* THREAD: lock */
if (c[i].fd != -1 && c[i].idle) {
c[i].close = 1;
c[i].read->handler(c[i].read);
}
}
// 取消定时器，调用handler处理
ngx_event_cancel_timers();
// 定时器红黑树为空，即已经没有任何事件
// 否则表示还有事件未处理，暂不退出
if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
{
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
// 调用所有模块的exit_process，进程结束hook
// 内部直接exit(0)退出
ngx_worker_process_exit(cycle);
}
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
// 处理事件的核心函数, event模块里
// 处理socket读写事件和定时器事件
// 获取负载均衡锁，监听端口接受连接
// 调用epoll模块的ngx_epoll_process_events
// 然后处理超时事件和在延后队列里的所有事件
// nginx大部分的工作量都在这里
ngx_process_events_and_timers(cycle);
// 收到了-s stop，直接停止进程
if (ngx_terminate) {
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
// 调用所有模块的exit_process，进程结束hook
// 内部直接exit(0)退出
ngx_worker_process_exit(cycle);
}
// 收到了-s quit，关闭监听端口后再停止进程（优雅关闭）
if (ngx_quit) {
ngx_quit = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
"gracefully shutting down");
// 改进程名字
ngx_setproctitle("worker process is shutting down");
if (!ngx_exiting) {
// in ngx_connection.c
// 遍历监听端口列表，逐个删除监听事件
// 不再接受新的连接请求
ngx_close_listening_sockets(cycle);
// 设置ngx_exiting标志，继续走循环
// 等所有事件都处理完了才能真正退出
ngx_exiting = 1;
}
}
// 收到了-s reopen，重新打开文件
if (ngx_reopen) {
ngx_reopen = 0;
ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
ngx_reopen_files(cycle, -1);
}
} // 无限循环，处理事件和信号
}