| /* | |
| * Copyright (C) Igor Sysoev | |
| */ | |
| #include <ngx_config.h> | |
| #include <ngx_core.h> | |
| #include <ngx_event.h> | |
| static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer); | |
| static void ngx_poll_done(ngx_cycle_t *cycle); | |
| static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, | |
| ngx_uint_t flags); | |
| static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, | |
| ngx_uint_t flags); | |
| static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, | |
| ngx_uint_t flags); | |
| static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf); | |
| static struct pollfd *event_list; | |
| static ngx_int_t nevents; | |
| static ngx_str_t poll_name = ngx_string("poll"); | |
| ngx_event_module_t ngx_poll_module_ctx = { | |
| &poll_name, | |
| NULL, /* create configuration */ | |
| ngx_poll_init_conf, /* init configuration */ | |
| { | |
| ngx_poll_add_event, /* add an event */ | |
| ngx_poll_del_event, /* delete an event */ | |
| ngx_poll_add_event, /* enable an event */ | |
| ngx_poll_del_event, /* disable an event */ | |
| NULL, /* add an connection */ | |
| NULL, /* delete an connection */ | |
| NULL, /* process the changes */ | |
| ngx_poll_process_events, /* process the events */ | |
| ngx_poll_init, /* init the events */ | |
| ngx_poll_done /* done the events */ | |
| } | |
| }; | |
| ngx_module_t ngx_poll_module = { | |
| NGX_MODULE_V1, | |
| &ngx_poll_module_ctx, /* module context */ | |
| NULL, /* module directives */ | |
| NGX_EVENT_MODULE, /* module type */ | |
| NULL, /* init master */ | |
| NULL, /* init module */ | |
| NULL, /* init process */ | |
| NULL, /* init thread */ | |
| NULL, /* exit thread */ | |
| NULL, /* exit process */ | |
| NULL, /* exit master */ | |
| NGX_MODULE_V1_PADDING | |
| }; | |
| static ngx_int_t | |
| ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer) | |
| { | |
| struct pollfd *list; | |
| if (event_list == NULL) { | |
| nevents = 0; | |
| } | |
| if (ngx_process == NGX_PROCESS_WORKER | |
| || cycle->old_cycle == NULL | |
| || cycle->old_cycle->connection_n < cycle->connection_n) | |
| { | |
| list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n, | |
| cycle->log); | |
| if (list == NULL) { | |
| return NGX_ERROR; | |
| } | |
| if (event_list) { | |
| ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents); | |
| ngx_free(event_list); | |
| } | |
| event_list = list; | |
| } | |
| ngx_io = ngx_os_io; | |
| ngx_event_actions = ngx_poll_module_ctx.actions; | |
| ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT; | |
| return NGX_OK; | |
| } | |
| static void | |
| ngx_poll_done(ngx_cycle_t *cycle) | |
| { | |
| ngx_free(event_list); | |
| event_list = NULL; | |
| } | |
| static ngx_int_t | |
| ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) | |
| { | |
| ngx_event_t *e; | |
| ngx_connection_t *c; | |
| c = ev->data; | |
| ev->active = 1; | |
| if (ev->index != NGX_INVALID_INDEX) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, | |
| "poll event fd:%d ev:%i is already set", c->fd, event); | |
| return NGX_OK; | |
| } | |
| if (event == NGX_READ_EVENT) { | |
| e = c->write; | |
| #if (NGX_READ_EVENT != POLLIN) | |
| event = POLLIN; | |
| #endif | |
| } else { | |
| e = c->read; | |
| #if (NGX_WRITE_EVENT != POLLOUT) | |
| event = POLLOUT; | |
| #endif | |
| } | |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "poll add event: fd:%d ev:%i", c->fd, event); | |
| if (e == NULL || e->index == NGX_INVALID_INDEX) { | |
| event_list[nevents].fd = c->fd; | |
| event_list[nevents].events = (short) event; | |
| event_list[nevents].revents = 0; | |
| ev->index = nevents; | |
| nevents++; | |
| } else { | |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "poll add index: %i", e->index); | |
| event_list[e->index].events |= (short) event; | |
| ev->index = e->index; | |
| } | |
| return NGX_OK; | |
| } | |
| static ngx_int_t | |
| ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) | |
| { | |
| ngx_event_t *e; | |
| ngx_connection_t *c; | |
| c = ev->data; | |
| ev->active = 0; | |
| if (ev->index == NGX_INVALID_INDEX) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, | |
| "poll event fd:%d ev:%i is already deleted", | |
| c->fd, event); | |
| return NGX_OK; | |
| } | |
| if (event == NGX_READ_EVENT) { | |
| e = c->write; | |
| #if (NGX_READ_EVENT != POLLIN) | |
| event = POLLIN; | |
| #endif | |
| } else { | |
| e = c->read; | |
| #if (NGX_WRITE_EVENT != POLLOUT) | |
| event = POLLOUT; | |
| #endif | |
| } | |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "poll del event: fd:%d ev:%i", c->fd, event); | |
| if (e == NULL || e->index == NGX_INVALID_INDEX) { | |
| nevents--; | |
| if (ev->index < (ngx_uint_t) nevents) { | |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "index: copy event %ui to %i", nevents, ev->index); | |
| event_list[ev->index] = event_list[nevents]; | |
| c = ngx_cycle->files[event_list[nevents].fd]; | |
| if (c->fd == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, | |
| "unexpected last event"); | |
| } else { | |
| if (c->read->index == (ngx_uint_t) nevents) { | |
| c->read->index = ev->index; | |
| } | |
| if (c->write->index == (ngx_uint_t) nevents) { | |
| c->write->index = ev->index; | |
| } | |
| } | |
| } | |
| } else { | |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, | |
| "poll del index: %i", e->index); | |
| event_list[e->index].events &= (short) ~event; | |
| } | |
| ev->index = NGX_INVALID_INDEX; | |
| return NGX_OK; | |
| } | |
| static ngx_int_t | |
| ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags) | |
| { | |
| int ready, revents; | |
| ngx_err_t err; | |
| ngx_int_t i, nready; | |
| ngx_uint_t found, level; | |
| ngx_event_t *ev, **queue; | |
| ngx_connection_t *c; | |
| /* NGX_TIMER_INFINITE == INFTIM */ | |
| #if (NGX_DEBUG0) | |
| if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) { | |
| for (i = 0; i < nevents; i++) { | |
| ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "poll: %d: fd:%d ev:%04Xd", | |
| i, event_list[i].fd, event_list[i].events); | |
| } | |
| } | |
| #endif | |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer); | |
| ready = poll(event_list, (u_int) nevents, (int) timer); | |
| if (ready == -1) { | |
| err = ngx_errno; | |
| } else { | |
| err = 0; | |
| } | |
| if (flags & NGX_UPDATE_TIME) { | |
| ngx_time_update(0, 0); | |
| } | |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "poll ready %d of %d", ready, nevents); | |
| if (err) { | |
| if (err == NGX_EINTR) { | |
| if (ngx_event_timer_alarm) { | |
| ngx_event_timer_alarm = 0; | |
| return NGX_OK; | |
| } | |
| level = NGX_LOG_INFO; | |
| } else { | |
| level = NGX_LOG_ALERT; | |
| } | |
| ngx_log_error(level, cycle->log, err, "poll() failed"); | |
| return NGX_ERROR; | |
| } | |
| if (ready == 0) { | |
| if (timer != NGX_TIMER_INFINITE) { | |
| return NGX_OK; | |
| } | |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, | |
| "poll() returned no events without timeout"); | |
| return NGX_ERROR; | |
| } | |
| ngx_mutex_lock(ngx_posted_events_mutex); | |
| nready = 0; | |
| for (i = 0; i < nevents && ready; i++) { | |
| revents = event_list[i].revents; | |
| #if 1 | |
| ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "poll: %d: fd:%d ev:%04Xd rev:%04Xd", | |
| i, event_list[i].fd, event_list[i].events, revents); | |
| #else | |
| if (revents) { | |
| ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0, | |
| "poll: %d: fd:%d ev:%04Xd rev:%04Xd", | |
| i, event_list[i].fd, event_list[i].events, revents); | |
| } | |
| #endif | |
| if (revents & POLLNVAL) { | |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, | |
| "poll() error fd:%d ev:%04Xd rev:%04Xd", | |
| event_list[i].fd, event_list[i].events, revents); | |
| } | |
| if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) { | |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, | |
| "strange poll() events fd:%d ev:%04Xd rev:%04Xd", | |
| event_list[i].fd, event_list[i].events, revents); | |
| } | |
| if (event_list[i].fd == -1) { | |
| /* | |
| * the disabled event, a workaround for our possible bug, | |
| * see the comment below | |
| */ | |
| continue; | |
| } | |
| c = ngx_cycle->files[event_list[i].fd]; | |
| if (c->fd == -1) { | |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event"); | |
| /* | |
| * it is certainly our fault and it should be investigated, | |
| * in the meantime we disable this event to avoid a CPU spinning | |
| */ | |
| if (i == nevents - 1) { | |
| nevents--; | |
| } else { | |
| event_list[i].fd = -1; | |
| } | |
| continue; | |
| } | |
| if ((revents & (POLLERR|POLLHUP|POLLNVAL)) | |
| && (revents & (POLLIN|POLLOUT)) == 0) | |
| { | |
| /* | |
| * if the error events were returned without POLLIN or POLLOUT, | |
| * then add these flags to handle the events at least in one | |
| * active handler | |
| */ | |
| revents |= POLLIN|POLLOUT; | |
| } | |
| found = 0; | |
| if (revents & POLLIN) { | |
| found = 1; | |
| ev = c->read; | |
| if ((flags & NGX_POST_THREAD_EVENTS) && !ev->accept) { | |
| ev->posted_ready = 1; | |
| } else { | |
| ev->ready = 1; | |
| } | |
| queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events: | |
| &ngx_posted_events); | |
| ngx_locked_post_event(ev, queue); | |
| } | |
| if (revents & POLLOUT) { | |
| found = 1; | |
| ev = c->write; | |
| if (flags & NGX_POST_THREAD_EVENTS) { | |
| ev->posted_ready = 1; | |
| } else { | |
| ev->ready = 1; | |
| } | |
| ngx_locked_post_event(ev, &ngx_posted_events); | |
| } | |
| if (found) { | |
| ready--; | |
| continue; | |
| } | |
| } | |
| ngx_mutex_unlock(ngx_posted_events_mutex); | |
| if (ready != 0) { | |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events"); | |
| } | |
| return nready; | |
| } | |
| static char * | |
| ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf) | |
| { | |
| ngx_event_conf_t *ecf; | |
| ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module); | |
| if (ecf->use != ngx_poll_module.ctx_index) { | |
| return NGX_CONF_OK; | |
| } | |
| #if (NGX_THREADS) | |
| ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, | |
| "poll() is not supported in the threaded mode"); | |
| return NGX_CONF_ERROR; | |
| #else | |
| return NGX_CONF_OK; | |
| #endif | |
| } |