| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| |
| |
| static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer); |
| static void ngx_select_done(ngx_cycle_t *cycle); |
| static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, |
| ngx_uint_t flags); |
| static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, |
| ngx_uint_t flags); |
| static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, |
| ngx_uint_t flags); |
| static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle); |
| static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf); |
| |
| |
| static fd_set master_read_fd_set; |
| static fd_set master_write_fd_set; |
| static fd_set work_read_fd_set; |
| static fd_set work_write_fd_set; |
| |
| static ngx_uint_t max_read; |
| static ngx_uint_t max_write; |
| static ngx_uint_t nevents; |
| |
| static ngx_event_t **event_index; |
| |
| |
| static ngx_str_t select_name = ngx_string("select"); |
| |
| static ngx_event_module_t ngx_select_module_ctx = { |
| &select_name, |
| NULL, /* create configuration */ |
| ngx_select_init_conf, /* init configuration */ |
| |
| { |
| ngx_select_add_event, /* add an event */ |
| ngx_select_del_event, /* delete an event */ |
| ngx_select_add_event, /* enable an event */ |
| ngx_select_del_event, /* disable an event */ |
| NULL, /* add an connection */ |
| NULL, /* delete an connection */ |
| NULL, /* trigger a notify */ |
| ngx_select_process_events, /* process the events */ |
| ngx_select_init, /* init the events */ |
| ngx_select_done /* done the events */ |
| } |
| |
| }; |
| |
| ngx_module_t ngx_select_module = { |
| NGX_MODULE_V1, |
| &ngx_select_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_select_init(ngx_cycle_t *cycle, ngx_msec_t timer) |
| { |
| ngx_event_t **index; |
| |
| if (event_index == NULL) { |
| FD_ZERO(&master_read_fd_set); |
| FD_ZERO(&master_write_fd_set); |
| nevents = 0; |
| } |
| |
| if (ngx_process >= NGX_PROCESS_WORKER |
| || cycle->old_cycle == NULL |
| || cycle->old_cycle->connection_n < cycle->connection_n) |
| { |
| index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n, |
| cycle->log); |
| if (index == NULL) { |
| return NGX_ERROR; |
| } |
| |
| if (event_index) { |
| ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents); |
| ngx_free(event_index); |
| } |
| |
| event_index = index; |
| } |
| |
| ngx_io = ngx_os_io; |
| |
| ngx_event_actions = ngx_select_module_ctx.actions; |
| |
| ngx_event_flags = NGX_USE_LEVEL_EVENT; |
| |
| max_read = 0; |
| max_write = 0; |
| |
| return NGX_OK; |
| } |
| |
| |
| static void |
| ngx_select_done(ngx_cycle_t *cycle) |
| { |
| ngx_free(event_index); |
| |
| event_index = NULL; |
| } |
| |
| |
| static ngx_int_t |
| ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags) |
| { |
| ngx_connection_t *c; |
| |
| c = ev->data; |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "select add event fd:%d ev:%i", c->fd, event); |
| |
| if (ev->index != NGX_INVALID_INDEX) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
| "select event fd:%d ev:%i is already set", c->fd, event); |
| return NGX_OK; |
| } |
| |
| if ((event == NGX_READ_EVENT && ev->write) |
| || (event == NGX_WRITE_EVENT && !ev->write)) |
| { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
| "invalid select %s event fd:%d ev:%i", |
| ev->write ? "write" : "read", c->fd, event); |
| return NGX_ERROR; |
| } |
| |
| if ((event == NGX_READ_EVENT && max_read >= FD_SETSIZE) |
| || (event == NGX_WRITE_EVENT && max_write >= FD_SETSIZE)) |
| { |
| ngx_log_error(NGX_LOG_ERR, ev->log, 0, |
| "maximum number of descriptors " |
| "supported by select() is %d", FD_SETSIZE); |
| return NGX_ERROR; |
| } |
| |
| if (event == NGX_READ_EVENT) { |
| FD_SET(c->fd, &master_read_fd_set); |
| max_read++; |
| |
| } else if (event == NGX_WRITE_EVENT) { |
| FD_SET(c->fd, &master_write_fd_set); |
| max_write++; |
| } |
| |
| ev->active = 1; |
| |
| event_index[nevents] = ev; |
| ev->index = nevents; |
| nevents++; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_select_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) { |
| return NGX_OK; |
| } |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "select del event fd:%d ev:%i", c->fd, event); |
| |
| if (event == NGX_READ_EVENT) { |
| FD_CLR(c->fd, &master_read_fd_set); |
| max_read--; |
| |
| } else if (event == NGX_WRITE_EVENT) { |
| FD_CLR(c->fd, &master_write_fd_set); |
| max_write--; |
| } |
| |
| if (ev->index < --nevents) { |
| e = event_index[nevents]; |
| event_index[ev->index] = e; |
| e->index = ev->index; |
| } |
| |
| ev->index = NGX_INVALID_INDEX; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, |
| ngx_uint_t flags) |
| { |
| int ready, nready; |
| ngx_err_t err; |
| ngx_uint_t i, found; |
| ngx_event_t *ev; |
| ngx_queue_t *queue; |
| struct timeval tv, *tp; |
| ngx_connection_t *c; |
| |
| #if (NGX_DEBUG) |
| if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) { |
| for (i = 0; i < nevents; i++) { |
| ev = event_index[i]; |
| c = ev->data; |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select event: fd:%d wr:%d", c->fd, ev->write); |
| } |
| } |
| #endif |
| |
| if (timer == NGX_TIMER_INFINITE) { |
| tp = NULL; |
| |
| } else { |
| tv.tv_sec = (long) (timer / 1000); |
| tv.tv_usec = (long) ((timer % 1000) * 1000); |
| tp = &tv; |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select timer: %M", timer); |
| |
| work_read_fd_set = master_read_fd_set; |
| work_write_fd_set = master_write_fd_set; |
| |
| if (max_read || max_write) { |
| ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp); |
| |
| } else { |
| |
| /* |
| * Winsock select() requires that at least one descriptor set must be |
| * be non-null, and any non-null descriptor set must contain at least |
| * one handle to a socket. Otherwise select() returns WSAEINVAL. |
| */ |
| |
| ngx_msleep(timer); |
| |
| ready = 0; |
| } |
| |
| err = (ready == -1) ? ngx_socket_errno : 0; |
| |
| if (flags & NGX_UPDATE_TIME) { |
| ngx_time_update(); |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select ready %d", ready); |
| |
| if (err) { |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed"); |
| |
| if (err == WSAENOTSOCK) { |
| ngx_select_repair_fd_sets(cycle); |
| } |
| |
| return NGX_ERROR; |
| } |
| |
| if (ready == 0) { |
| if (timer != NGX_TIMER_INFINITE) { |
| return NGX_OK; |
| } |
| |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
| "select() returned no events without timeout"); |
| return NGX_ERROR; |
| } |
| |
| nready = 0; |
| |
| for (i = 0; i < nevents; i++) { |
| ev = event_index[i]; |
| c = ev->data; |
| found = 0; |
| |
| if (ev->write) { |
| if (FD_ISSET(c->fd, &work_write_fd_set)) { |
| found = 1; |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select write %d", c->fd); |
| } |
| |
| } else { |
| if (FD_ISSET(c->fd, &work_read_fd_set)) { |
| found = 1; |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select read %d", c->fd); |
| } |
| } |
| |
| if (found) { |
| ev->ready = 1; |
| |
| queue = ev->accept ? &ngx_posted_accept_events |
| : &ngx_posted_events; |
| |
| ngx_post_event(ev, queue); |
| |
| nready++; |
| } |
| } |
| |
| if (ready != nready) { |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
| "select ready != events: %d:%d", ready, nready); |
| |
| ngx_select_repair_fd_sets(cycle); |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| static void |
| ngx_select_repair_fd_sets(ngx_cycle_t *cycle) |
| { |
| int n; |
| u_int i; |
| socklen_t len; |
| ngx_err_t err; |
| ngx_socket_t s; |
| |
| for (i = 0; i < master_read_fd_set.fd_count; i++) { |
| |
| s = master_read_fd_set.fd_array[i]; |
| len = sizeof(int); |
| |
| if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) { |
| err = ngx_socket_errno; |
| |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, err, |
| "invalid descriptor #%d in read fd_set", s); |
| |
| FD_CLR(s, &master_read_fd_set); |
| } |
| } |
| |
| for (i = 0; i < master_write_fd_set.fd_count; i++) { |
| |
| s = master_write_fd_set.fd_array[i]; |
| len = sizeof(int); |
| |
| if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) { |
| err = ngx_socket_errno; |
| |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, err, |
| "invalid descriptor #%d in write fd_set", s); |
| |
| FD_CLR(s, &master_write_fd_set); |
| } |
| } |
| } |
| |
| |
| static char * |
| ngx_select_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_select_module.ctx_index) { |
| return NGX_CONF_OK; |
| } |
| |
| return NGX_CONF_OK; |
| } |
