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415
src/event/modules/ngx_poll_module.c
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415
src/event/modules/ngx_poll_module.c
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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static ngx_int_t ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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static void ngx_poll_done(ngx_cycle_t *cycle);
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static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event,
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ngx_uint_t flags);
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static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event,
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ngx_uint_t flags);
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static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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ngx_uint_t flags);
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static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf);
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static struct pollfd *event_list;
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static ngx_uint_t nevents;
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static ngx_str_t poll_name = ngx_string("poll");
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ngx_event_module_t ngx_poll_module_ctx = {
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&poll_name,
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NULL, /* create configuration */
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ngx_poll_init_conf, /* init configuration */
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{
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ngx_poll_add_event, /* add an event */
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ngx_poll_del_event, /* delete an event */
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ngx_poll_add_event, /* enable an event */
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ngx_poll_del_event, /* disable an event */
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NULL, /* add an connection */
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NULL, /* delete an connection */
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NULL, /* trigger a notify */
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ngx_poll_process_events, /* process the events */
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ngx_poll_init, /* init the events */
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ngx_poll_done /* done the events */
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}
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};
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ngx_module_t ngx_poll_module = {
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NGX_MODULE_V1,
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&ngx_poll_module_ctx, /* module context */
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NULL, /* module directives */
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NGX_EVENT_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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{
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struct pollfd *list;
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if (event_list == NULL) {
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nevents = 0;
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}
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if (ngx_process >= NGX_PROCESS_WORKER
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|| cycle->old_cycle == NULL
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|| cycle->old_cycle->connection_n < cycle->connection_n)
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{
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list = ngx_alloc(sizeof(struct pollfd) * cycle->connection_n,
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cycle->log);
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if (list == NULL) {
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return NGX_ERROR;
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}
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if (event_list) {
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ngx_memcpy(list, event_list, sizeof(ngx_event_t *) * nevents);
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ngx_free(event_list);
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}
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event_list = list;
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}
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ngx_io = ngx_os_io;
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ngx_event_actions = ngx_poll_module_ctx.actions;
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ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT;
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return NGX_OK;
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}
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static void
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ngx_poll_done(ngx_cycle_t *cycle)
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{
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ngx_free(event_list);
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event_list = NULL;
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}
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static ngx_int_t
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ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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{
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ngx_event_t *e;
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ngx_connection_t *c;
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c = ev->data;
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ev->active = 1;
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if (ev->index != NGX_INVALID_INDEX) {
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ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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"poll event fd:%d ev:%i is already set", c->fd, event);
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return NGX_OK;
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}
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if (event == NGX_READ_EVENT) {
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e = c->write;
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#if (NGX_READ_EVENT != POLLIN)
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event = POLLIN;
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#endif
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} else {
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e = c->read;
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#if (NGX_WRITE_EVENT != POLLOUT)
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event = POLLOUT;
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#endif
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}
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"poll add event: fd:%d ev:%i", c->fd, event);
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if (e == NULL || e->index == NGX_INVALID_INDEX) {
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event_list[nevents].fd = c->fd;
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event_list[nevents].events = (short) event;
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event_list[nevents].revents = 0;
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ev->index = nevents;
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nevents++;
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} else {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"poll add index: %i", e->index);
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event_list[e->index].events |= (short) event;
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ev->index = e->index;
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}
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return NGX_OK;
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}
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static ngx_int_t
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ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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{
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ngx_event_t *e;
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ngx_connection_t *c;
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c = ev->data;
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ev->active = 0;
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if (ev->index == NGX_INVALID_INDEX) {
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ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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"poll event fd:%d ev:%i is already deleted",
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c->fd, event);
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return NGX_OK;
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}
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if (event == NGX_READ_EVENT) {
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e = c->write;
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#if (NGX_READ_EVENT != POLLIN)
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event = POLLIN;
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#endif
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} else {
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e = c->read;
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#if (NGX_WRITE_EVENT != POLLOUT)
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event = POLLOUT;
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#endif
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}
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"poll del event: fd:%d ev:%i", c->fd, event);
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if (e == NULL || e->index == NGX_INVALID_INDEX) {
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nevents--;
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if (ev->index < nevents) {
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"index: copy event %ui to %i", nevents, ev->index);
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event_list[ev->index] = event_list[nevents];
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c = ngx_cycle->files[event_list[nevents].fd];
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if (c->fd == -1) {
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ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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"unexpected last event");
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} else {
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if (c->read->index == nevents) {
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c->read->index = ev->index;
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}
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if (c->write->index == nevents) {
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c->write->index = ev->index;
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}
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}
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}
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} else {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"poll del index: %i", e->index);
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event_list[e->index].events &= (short) ~event;
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}
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ev->index = NGX_INVALID_INDEX;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
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{
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int ready, revents;
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ngx_err_t err;
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ngx_uint_t i, found, level;
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ngx_event_t *ev;
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ngx_queue_t *queue;
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ngx_connection_t *c;
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/* NGX_TIMER_INFINITE == INFTIM */
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#if (NGX_DEBUG0)
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if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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for (i = 0; i < nevents; i++) {
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ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"poll: %ui: fd:%d ev:%04Xd",
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i, event_list[i].fd, event_list[i].events);
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}
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}
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#endif
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer);
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ready = poll(event_list, (u_int) nevents, (int) timer);
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err = (ready == -1) ? ngx_errno : 0;
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if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) {
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ngx_time_update();
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}
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"poll ready %d of %ui", ready, nevents);
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if (err) {
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if (err == NGX_EINTR) {
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if (ngx_event_timer_alarm) {
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ngx_event_timer_alarm = 0;
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return NGX_OK;
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}
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level = NGX_LOG_INFO;
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} else {
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level = NGX_LOG_ALERT;
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}
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ngx_log_error(level, cycle->log, err, "poll() failed");
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return NGX_ERROR;
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}
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if (ready == 0) {
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if (timer != NGX_TIMER_INFINITE) {
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return NGX_OK;
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}
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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"poll() returned no events without timeout");
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return NGX_ERROR;
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}
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for (i = 0; i < nevents && ready; i++) {
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revents = event_list[i].revents;
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#if 1
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ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"poll: %ui: fd:%d ev:%04Xd rev:%04Xd",
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i, event_list[i].fd, event_list[i].events, revents);
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#else
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if (revents) {
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ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"poll: %ui: fd:%d ev:%04Xd rev:%04Xd",
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i, event_list[i].fd, event_list[i].events, revents);
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}
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#endif
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if (revents & POLLNVAL) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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"poll() error fd:%d ev:%04Xd rev:%04Xd",
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event_list[i].fd, event_list[i].events, revents);
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}
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if (revents & ~(POLLIN|POLLOUT|POLLERR|POLLHUP|POLLNVAL)) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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"strange poll() events fd:%d ev:%04Xd rev:%04Xd",
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event_list[i].fd, event_list[i].events, revents);
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}
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if (event_list[i].fd == -1) {
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/*
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* the disabled event, a workaround for our possible bug,
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* see the comment below
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*/
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continue;
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}
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c = ngx_cycle->files[event_list[i].fd];
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if (c->fd == -1) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "unexpected event");
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/*
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* it is certainly our fault and it should be investigated,
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* in the meantime we disable this event to avoid a CPU spinning
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*/
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if (i == nevents - 1) {
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nevents--;
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} else {
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event_list[i].fd = -1;
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}
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continue;
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}
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if (revents & (POLLERR|POLLHUP|POLLNVAL)) {
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/*
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* if the error events were returned, add POLLIN and POLLOUT
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* to handle the events at least in one active handler
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*/
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revents |= POLLIN|POLLOUT;
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}
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found = 0;
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if ((revents & POLLIN) && c->read->active) {
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found = 1;
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ev = c->read;
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ev->ready = 1;
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queue = ev->accept ? &ngx_posted_accept_events
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: &ngx_posted_events;
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ngx_post_event(ev, queue);
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}
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if ((revents & POLLOUT) && c->write->active) {
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found = 1;
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ev = c->write;
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ev->ready = 1;
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ngx_post_event(ev, &ngx_posted_events);
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}
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if (found) {
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ready--;
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continue;
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}
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}
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if (ready != 0) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events");
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}
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return NGX_OK;
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}
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static char *
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ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf)
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{
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ngx_event_conf_t *ecf;
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ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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if (ecf->use != ngx_poll_module.ctx_index) {
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return NGX_CONF_OK;
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}
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return NGX_CONF_OK;
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}
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