439 lines
11 KiB
C
439 lines
11 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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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_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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static void ngx_select_done(ngx_cycle_t *cycle);
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static ngx_int_t ngx_select_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_select_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_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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ngx_uint_t flags);
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static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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static fd_set master_read_fd_set;
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static fd_set master_write_fd_set;
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static fd_set work_read_fd_set;
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static fd_set work_write_fd_set;
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static ngx_int_t max_fd;
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static ngx_uint_t nevents;
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static ngx_event_t **event_index;
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static ngx_str_t select_name = ngx_string("select");
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ngx_event_module_t ngx_select_module_ctx = {
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&select_name,
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NULL, /* create configuration */
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ngx_select_init_conf, /* init configuration */
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{
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ngx_select_add_event, /* add an event */
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ngx_select_del_event, /* delete an event */
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ngx_select_add_event, /* enable an event */
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ngx_select_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, /* process the changes */
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ngx_select_process_events, /* process the events */
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ngx_select_init, /* init the events */
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ngx_select_done /* done the events */
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}
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};
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ngx_module_t ngx_select_module = {
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NGX_MODULE_V1,
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&ngx_select_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_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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{
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ngx_event_t **index;
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if (event_index == NULL) {
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FD_ZERO(&master_read_fd_set);
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FD_ZERO(&master_write_fd_set);
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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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index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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cycle->log);
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if (index == NULL) {
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return NGX_ERROR;
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}
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if (event_index) {
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ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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ngx_free(event_index);
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}
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event_index = index;
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}
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ngx_io = ngx_os_io;
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ngx_event_actions = ngx_select_module_ctx.actions;
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ngx_event_flags = NGX_USE_LEVEL_EVENT;
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max_fd = -1;
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return NGX_OK;
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}
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static void
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ngx_select_done(ngx_cycle_t *cycle)
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{
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ngx_free(event_index);
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event_index = NULL;
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}
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static ngx_int_t
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ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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{
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ngx_connection_t *c;
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c = ev->data;
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"select add event fd:%d ev:%i", c->fd, event);
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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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"select 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 && ev->write)
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|| (event == NGX_WRITE_EVENT && !ev->write))
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{
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ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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"invalid select %s event fd:%d ev:%i",
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ev->write ? "write" : "read", c->fd, event);
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return NGX_ERROR;
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}
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if (event == NGX_READ_EVENT) {
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FD_SET(c->fd, &master_read_fd_set);
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} else if (event == NGX_WRITE_EVENT) {
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FD_SET(c->fd, &master_write_fd_set);
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}
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if (max_fd != -1 && max_fd < c->fd) {
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max_fd = c->fd;
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}
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ev->active = 1;
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event_index[nevents] = ev;
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ev->index = nevents;
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nevents++;
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return NGX_OK;
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}
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static ngx_int_t
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ngx_select_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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return NGX_OK;
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}
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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"select del event fd:%d ev:%i", c->fd, event);
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if (event == NGX_READ_EVENT) {
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FD_CLR(c->fd, &master_read_fd_set);
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} else if (event == NGX_WRITE_EVENT) {
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FD_CLR(c->fd, &master_write_fd_set);
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}
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if (max_fd == c->fd) {
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max_fd = -1;
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}
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if (ev->index < --nevents) {
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e = event_index[nevents];
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event_index[ev->index] = e;
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e->index = ev->index;
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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_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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ngx_uint_t flags)
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{
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int ready, nready;
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ngx_err_t err;
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ngx_uint_t i, found;
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ngx_event_t *ev, **queue;
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struct timeval tv, *tp;
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ngx_connection_t *c;
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if (max_fd == -1) {
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for (i = 0; i < nevents; i++) {
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c = event_index[i]->data;
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if (max_fd < c->fd) {
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max_fd = c->fd;
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}
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}
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"change max_fd: %d", max_fd);
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}
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#if (NGX_DEBUG)
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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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ev = event_index[i];
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c = ev->data;
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"select event: fd:%d wr:%d", c->fd, ev->write);
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}
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"max_fd: %d", max_fd);
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}
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#endif
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if (timer == NGX_TIMER_INFINITE) {
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tp = NULL;
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} else {
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tv.tv_sec = (long) (timer / 1000);
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tv.tv_usec = (long) ((timer % 1000) * 1000);
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tp = &tv;
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}
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"select timer: %M", timer);
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work_read_fd_set = master_read_fd_set;
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work_write_fd_set = master_write_fd_set;
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ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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if (ready == -1) {
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err = ngx_socket_errno;
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} else {
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err = 0;
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}
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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_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"select ready %d", ready);
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if (err) {
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ngx_uint_t level;
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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, "select() failed");
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if (err == EBADF) {
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ngx_select_repair_fd_sets(cycle);
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}
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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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"select() returned no events without timeout");
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return NGX_ERROR;
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}
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ngx_mutex_lock(ngx_posted_events_mutex);
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nready = 0;
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for (i = 0; i < nevents; i++) {
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ev = event_index[i];
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c = ev->data;
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found = 0;
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if (ev->write) {
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if (FD_ISSET(c->fd, &work_write_fd_set)) {
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found = 1;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"select write %d", c->fd);
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}
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} else {
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if (FD_ISSET(c->fd, &work_read_fd_set)) {
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found = 1;
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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"select read %d", c->fd);
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}
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}
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if (found) {
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ev->ready = 1;
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queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
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&ngx_posted_events);
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ngx_locked_post_event(ev, queue);
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nready++;
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}
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}
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ngx_mutex_unlock(ngx_posted_events_mutex);
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if (ready != nready) {
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ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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"select ready != events: %d:%d", ready, nready);
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ngx_select_repair_fd_sets(cycle);
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}
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return NGX_OK;
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}
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static void
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ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
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{
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int n;
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socklen_t len;
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ngx_err_t err;
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ngx_socket_t s;
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for (s = 0; s <= max_fd; s++) {
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if (FD_ISSET(s, &master_read_fd_set) == 0) {
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continue;
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}
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len = sizeof(int);
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if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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err = ngx_socket_errno;
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ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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"invalid descriptor #%d in read fd_set", s);
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FD_CLR(s, &master_read_fd_set);
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}
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}
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for (s = 0; s <= max_fd; s++) {
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if (FD_ISSET(s, &master_write_fd_set) == 0) {
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continue;
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}
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len = sizeof(int);
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if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
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err = ngx_socket_errno;
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ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
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"invalid descriptor #%d in write fd_set", s);
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FD_CLR(s, &master_write_fd_set);
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}
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}
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max_fd = -1;
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}
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static char *
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ngx_select_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_select_module.ctx_index) {
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return NGX_CONF_OK;
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}
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/* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
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if (cycle->connection_n > FD_SETSIZE) {
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ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
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"the maximum number of files "
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"supported by select() is %ud", FD_SETSIZE);
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return NGX_CONF_ERROR;
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}
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#if (NGX_THREADS)
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ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
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"select() is not supported in the threaded mode");
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return NGX_CONF_ERROR;
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#else
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return NGX_CONF_OK;
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#endif
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}
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