main(int argc, char *const *argv)
->
ngx_master_process_cycle(cycle);
->
ngx_start_worker_processes(cycle, ccf->worker_processes,
NGX_PROCESS_RESPAWN);
->
ngx_spawn_process(cycle, ngx_worker_process_cycle,
(void *) (intptr_t) i, “worker process”, type);
->
pid = fork();
main(int argc, char *const *argv)
->
ngx_master_process_cycle(cycle);
->
ngx_start_cache_manager_processes(cycle, 0);
->
ngx_spawn_process(cycle, ngx_cache_manager_process_cycle,
&ngx_cache_manager_ctx, “cache manager process”,
respawn ? NGX_PROCESS_JUST_RESPAWN : NGX_PROCESS_RESPAWN);
->
pid = fork();
static ngx_str_t epoll_name = ngx_string(“epoll”);
static ngx_command_t ngx_epoll_commands[]
ngx_epoll_module
->
ngx_epoll_module_ctx
->
ngx_epoll_init
->
ep = epoll_create(cycle->connection_n / 2);
static ngx_str_t event_core_name = ngx_string(“event_core”);
static ngx_command_t ngx_event_core_commands[]
ngx_event_core_module
->
ngx_event_core_module_ctx
->
ngx_event_core_init_conf(ngx_cycle_t *cycle, void *conf)
->
fd = epoll_create(100);
在ngx_event_core_init_conf(ngx_cycle_t *cycle, void *conf)函数中
会判断是否支持EPOLL,然后创建epoll树节点：
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
fd = epoll_create(100);
if (fd != -1) {
(void) close(fd);
module = &ngx_epoll_module;
} else if (ngx_errno != NGX_ENOSYS) {
module = &ngx_epoll_module;
}
#endif
ngx_event_module_t ngx_epoll_module_ctx
->
ngx_epoll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
->
epoll_ctl(ep, op, c->fd, &ee)
ngx_event_module_t ngx_epoll_module_ctx = {
&epoll_name,
ngx_epoll_create_conf, /* create configuration
/
ngx_epoll_init_conf, /
init configuration */
{
ngx_epoll_add_event, /* add an event */
ngx_epoll_del_event, /* delete an event */
ngx_epoll_add_event, /* enable an event */
ngx_epoll_del_event, /* disable an event */
ngx_epoll_add_connection, /* add an connection */
ngx_epoll_del_connection, /* delete an connection */
#if (NGX_HAVE_EVENTFD)
ngx_epoll_notify, /* trigger a notify
/
#else
NULL, /
trigger a notify
/
#endif
ngx_epoll_process_events, /
process the events
/
ngx_epoll_init, /
init the events
/
ngx_epoll_done, /
done the events */
}
};
ngx_event_actions = ngx_epoll_module_ctx.actions;
在Ngx_event.c中，处理事件event的函数是从event_module中继承过来的：
#define ngx_process_events ngx_event_actions.process_events
#define ngx_done_events ngx_event_actions.done
#define ngx_add_event ngx_event_actions.add
#define ngx_del_event ngx_event_actions.del
#define ngx_add_conn ngx_event_actions.add_conn
#define ngx_del_conn ngx_event_actions.del_conn
#define ngx_notify ngx_event_actions.notify