Mercurial > hg > nginx-vendor-0-7
view src/event/modules/ngx_poll_module.c @ 71:66f1f40f29d6
Added tag NGINX_0_1_35 for changeset 8ad297c88dcb
author | Igor Sysoev <http://sysoev.ru> |
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date | Tue, 07 Jun 2005 00:00:00 +0400 |
parents | b55cbf18157e |
children | 71c46860eb55 |
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/* * 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); static void ngx_poll_done(ngx_cycle_t *cycle); static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int flags); static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags); static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle); static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf); static struct pollfd *event_list; static int nevents; #if 0 static ngx_event_t **ready_index; #endif static ngx_event_t *accept_events; 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 module */ NULL /* init process */ }; static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle) { 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; #if 0 if (ready_index) { ngx_free(ready_index); } ready_index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n, cycle->log); if (ready_index == NULL) { return NGX_ERROR; } #endif } ngx_io = ngx_os_io; ngx_event_actions = ngx_poll_module_ctx.actions; ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT; return NGX_OK; } static void ngx_poll_done(ngx_cycle_t *cycle) { ngx_free(event_list); #if 0 ngx_free(ready_index); #endif event_list = NULL; #if 0 ready_index = NULL; #endif } static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, int event, u_int 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:%d 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:%d", c->fd, event); if (e == NULL || e->index == NGX_INVALID_INDEX) { event_list[nevents].fd = c->fd; event_list[nevents].events = event; event_list[nevents].revents = 0; ev->index = nevents; nevents++; } else { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll add index: %d", e->index); event_list[e->index].events |= event; ev->index = e->index; } ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0; return NGX_OK; } static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, int event, u_int flags) { ngx_uint_t i; ngx_cycle_t **cycle; 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:%d 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:%d", c->fd, event); if (e == NULL || e->index == NGX_INVALID_INDEX) { nevents--; if (ev->index < (u_int) nevents) { ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, "index: copy event %d to %d", nevents, ev->index); event_list[ev->index] = event_list[nevents]; c = &ngx_cycle->connections[event_list[nevents].fd]; if (c->fd == -1) { cycle = ngx_old_cycles.elts; for (i = 0; i < ngx_old_cycles.nelts; i++) { if (cycle[i] == NULL) { continue; } c = &cycle[i]->connections[event_list[nevents].fd]; if (c->fd != -1) { break; } } } if (c->fd == -1) { ngx_log_error(NGX_LOG_ALERT, ev->log, 0, "unexpected last event"); } else { if (c->read->index == (u_int) nevents) { c->read->index = ev->index; } if (c->write->index == (u_int) nevents) { c->write->index = ev->index; } } } } else { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, "poll del index: %d", e->index); event_list[e->index].events &= ~event; } ev->index = NGX_INVALID_INDEX; return NGX_OK; } static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle) { int ready, revents; ngx_int_t i, nready; ngx_uint_t n, found, lock, expire; ngx_msec_t timer; ngx_err_t err; ngx_cycle_t **old_cycle; ngx_event_t *ev; ngx_epoch_msec_t delta; ngx_connection_t *c; struct timeval tv; for ( ;; ) { timer = ngx_event_find_timer(); if (timer != 0) { break; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll expired timer"); ngx_event_expire_timers((ngx_msec_t) (ngx_elapsed_msec - ngx_old_elapsed_msec)); } /* NGX_TIMER_INFINITE == INFTIM */ if (timer == NGX_TIMER_INFINITE) { expire = 0; } else { expire = 1; } ngx_old_elapsed_msec = ngx_elapsed_msec; #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 if (ngx_accept_mutex) { if (ngx_accept_disabled > 0) { ngx_accept_disabled--; } else { if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) { return NGX_ERROR; } if (ngx_accept_mutex_held == 0 && (timer == NGX_TIMER_INFINITE || timer > ngx_accept_mutex_delay)) { timer = ngx_accept_mutex_delay; expire = 0; } } } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d", timer); ready = poll(event_list, (u_int) nevents, (int) timer); if (ready == -1) { err = ngx_errno; } else { err = 0; } ngx_gettimeofday(&tv); ngx_time_update(tv.tv_sec); delta = ngx_elapsed_msec; ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000 - ngx_start_msec; ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll ready %d of %d", ready, nevents); if (err) { ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT, cycle->log, err, "poll() failed"); ngx_accept_mutex_unlock(); return NGX_ERROR; } if (timer != NGX_TIMER_INFINITE) { delta = ngx_elapsed_msec - delta; ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %d, delta: %d", timer, (int) delta); } else { if (ready == 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll() returned no events without timeout"); ngx_accept_mutex_unlock(); return NGX_ERROR; } } if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { ngx_accept_mutex_unlock(); return NGX_ERROR; } lock = 1; nready = 0; for (i = 0; i < nevents && ready; i++) { revents = event_list[i].revents; #if 0 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->connections[event_list[i].fd]; if (c->fd == -1) { old_cycle = ngx_old_cycles.elts; for (n = 0; n < ngx_old_cycles.nelts; n++) { if (old_cycle[n] == NULL) { continue; } c = &old_cycle[n]->connections[event_list[i].fd]; if (c->fd != -1) { break; } } } 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; ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } ngx_poll_del_event(ev, NGX_READ_EVENT, 0); } if (ev->accept) { ev->next = accept_events; accept_events = ev; } else { ngx_post_event(ev); } #if 0 ready_index[nready++] = c->read; #endif } if (revents & POLLOUT) { found = 1; ev = c->write; ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0); } ngx_post_event(ev); #if 0 ready_index[nready++] = c->write; #endif } if (found) { ready--; continue; } } #if 0 for (i = 0; i < nready; i++) { ev = ready_index[i]; if (!ev->active) { continue; } ev->ready = 1; if (ev->oneshot) { if (ev->timer_set) { ngx_del_timer(ev); } if (ev->write) { ngx_poll_del_event(ev, NGX_WRITE_EVENT, 0); } else { ngx_poll_del_event(ev, NGX_READ_EVENT, 0); } } ev->handler(ev); } #endif ev = accept_events; for ( ;; ) { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "accept event %p", ev); if (ev == NULL) { break; } ngx_mutex_unlock(ngx_posted_events_mutex); ev->handler(ev); if (ngx_accept_disabled > 0) { lock = 0; break; } ev = ev->next; if (ev == NULL) { lock = 0; break; } if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { ngx_accept_mutex_unlock(); return NGX_ERROR; } } ngx_accept_mutex_unlock(); accept_events = NULL; if (lock) { ngx_mutex_unlock(ngx_posted_events_mutex); } if (ready != 0) { ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events"); } if (expire && delta) { ngx_event_expire_timers((ngx_msec_t) delta); } if (!ngx_threaded) { ngx_event_process_posted(cycle); } 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 }