3 * Copyright (C) Igor Sysoev
7 #include <ngx_config.h>
12 static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
13 static void ngx_poll_done(ngx_cycle_t *cycle);
14 static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event,
16 static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event,
18 static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
20 static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
23 static struct pollfd *event_list;
24 static ngx_int_t nevents;
27 static ngx_str_t poll_name = ngx_string("poll");
29 ngx_event_module_t ngx_poll_module_ctx = {
31 NULL, /* create configuration */
32 ngx_poll_init_conf, /* init configuration */
35 ngx_poll_add_event, /* add an event */
36 ngx_poll_del_event, /* delete an event */
37 ngx_poll_add_event, /* enable an event */
38 ngx_poll_del_event, /* disable an event */
39 NULL, /* add an connection */
40 NULL, /* delete an connection */
41 NULL, /* process the changes */
42 ngx_poll_process_events, /* process the events */
43 ngx_poll_init, /* init the events */
44 ngx_poll_done /* done the events */
49 ngx_module_t ngx_poll_module = {
51 &ngx_poll_module_ctx, /* module context */
52 NULL, /* module directives */
53 NGX_EVENT_MODULE, /* module type */
54 NULL, /* init master */
55 NULL, /* init module */
56 NULL, /* init process */
57 NULL, /* init thread */
58 NULL, /* exit thread */
59 NULL, /* exit process */
60 NULL, /* exit master */
67 ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
71 if (event_list == NULL) {
75 if (ngx_process == NGX_PROCESS_WORKER
76 || cycle->old_cycle == NULL
77 || cycle->old_cycle->connection_n < cycle->connection_n)
79 list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
86 ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
95 ngx_event_actions = ngx_poll_module_ctx.actions;
97 ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
104 ngx_poll_done(ngx_cycle_t *cycle)
106 ngx_free(event_list);
113 ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
122 if (ev->index != NGX_INVALID_INDEX) {
123 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
124 "poll event fd:%d ev:%i is already set", c->fd, event);
128 if (event == NGX_READ_EVENT) {
130 #if (NGX_READ_EVENT != POLLIN)
136 #if (NGX_WRITE_EVENT != POLLOUT)
141 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
142 "poll add event: fd:%d ev:%i", c->fd, event);
144 if (e == NULL || e->index == NGX_INVALID_INDEX) {
145 event_list[nevents].fd = c->fd;
146 event_list[nevents].events = (short) event;
147 event_list[nevents].revents = 0;
153 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
154 "poll add index: %i", e->index);
156 event_list[e->index].events |= (short) event;
157 ev->index = e->index;
165 ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
174 if (ev->index == NGX_INVALID_INDEX) {
175 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
176 "poll event fd:%d ev:%i is already deleted",
181 if (event == NGX_READ_EVENT) {
183 #if (NGX_READ_EVENT != POLLIN)
189 #if (NGX_WRITE_EVENT != POLLOUT)
194 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
195 "poll del event: fd:%d ev:%i", c->fd, event);
197 if (e == NULL || e->index == NGX_INVALID_INDEX) {
200 if (ev->index < (ngx_uint_t) nevents) {
202 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
203 "index: copy event %ui to %i", nevents, ev->index);
205 event_list[ev->index] = event_list[nevents];
207 c = ngx_cycle->files[event_list[nevents].fd];
210 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
211 "unexpected last event");
214 if (c->read->index == (ngx_uint_t) nevents) {
215 c->read->index = ev->index;
218 if (c->write->index == (ngx_uint_t) nevents) {
219 c->write->index = ev->index;
225 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
226 "poll del index: %i", e->index);
228 event_list[e->index].events &= (short) ~event;
231 ev->index = NGX_INVALID_INDEX;
238 ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
243 ngx_uint_t found, level;
244 ngx_event_t *ev, **queue;
247 /* NGX_TIMER_INFINITE == INFTIM */
250 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
251 for (i = 0; i < nevents; i++) {
252 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
253 "poll: %d: fd:%d ev:%04Xd",
254 i, event_list[i].fd, event_list[i].events);
259 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer);
261 ready = poll(event_list, (u_int) nevents, (int) timer);
269 if (flags & NGX_UPDATE_TIME) {
270 ngx_time_update(0, 0);
273 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
274 "poll ready %d of %d", ready, nevents);
277 if (err == NGX_EINTR) {
279 if (ngx_event_timer_alarm) {
280 ngx_event_timer_alarm = 0;
284 level = NGX_LOG_INFO;
287 level = NGX_LOG_ALERT;
290 ngx_log_error(level, cycle->log, err, "poll() failed");
295 if (timer != NGX_TIMER_INFINITE) {
299 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
300 "poll() returned no events without timeout");
304 ngx_mutex_lock(ngx_posted_events_mutex);
308 for (i = 0; i < nevents && ready; i++) {
310 revents = event_list[i].revents;
313 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
314 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
315 i, event_list[i].fd, event_list[i].events, revents);
318 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
319 "poll: %d: fd:%d ev:%04Xd rev:%04Xd",
320 i, event_list[i].fd, event_list[i].events, revents);
324 if (revents & POLLNVAL) {
325 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
326 "poll() error fd:%d ev:%04Xd rev:%04Xd",
327 event_list[i].fd, event_list[i].events, revents);
330 if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
331 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
332 "strange poll() events fd:%d ev:%04Xd rev:%04Xd",
333 event_list[i].fd, event_list[i].events, revents);
336 if (event_list[i].fd == -1) {
338 * the disabled event, a workaround for our possible bug,
339 * see the comment below
344 c = ngx_cycle->files[event_list[i].fd];
347 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
350 * it is certainly our fault and it should be investigated,
351 * in the meantime we disable this event to avoid a CPU spinning
354 if (i == nevents - 1) {
357 event_list[i].fd = -1;
363 if ((revents & (POLLERR|POLLHUP|POLLNVAL))
364 && (revents & (POLLIN|POLLOUT)) == 0)
367 * if the error events were returned without POLLIN or POLLOUT,
368 * then add these flags to handle the events at least in one
372 revents |= POLLIN|POLLOUT;
377 if (revents & POLLIN) {
382 if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) {
383 ev->posted_ready = 1;
389 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
391 ngx_locked_post_event(ev, queue);
394 if (revents & POLLOUT) {
398 if (flags & NGX_POST_THREAD_EVENTS) {
399 ev->posted_ready = 1;
405 ngx_locked_post_event(ev, &ngx_posted_events);
414 ngx_mutex_unlock(ngx_posted_events_mutex);
417 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
425 ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
427 ngx_event_conf_t *ecf;
429 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
431 if (ecf->use != ngx_poll_module.ctx_index) {
437 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
438 "poll() is not supported in the threaded mode");
439 return NGX_CONF_ERROR;