| |
| /* |
| * Copyright (C) Igor Sysoev |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| |
| |
| |
| static ngx_int_t ngx_select_init(ngx_cycle_t *cycle); |
| static void ngx_select_done(ngx_cycle_t *cycle); |
| static ngx_int_t ngx_select_add_event(ngx_event_t *ev, int event, u_int flags); |
| static ngx_int_t ngx_select_del_event(ngx_event_t *ev, int event, u_int flags); |
| static ngx_int_t ngx_select_process_events(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; |
| |
| #if (NGX_WIN32) |
| static int max_read; |
| static int max_write; |
| #else |
| static int max_fd; |
| #endif |
| |
| static ngx_uint_t nevents; |
| |
| static ngx_event_t **event_index; |
| #if 0 |
| static ngx_event_t **ready_index; |
| #endif |
| |
| static ngx_event_t *accept_events; |
| |
| |
| static ngx_str_t select_name = ngx_string("select"); |
| |
| 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, /* process the changes */ |
| 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, |
| &ngx_select_module_ctx, /* module context */ |
| NULL, /* module directives */ |
| NGX_EVENT_MODULE, /* module type */ |
| NULL, /* init module */ |
| NULL /* init process */ |
| }; |
| |
| |
| static ngx_int_t ngx_select_init(ngx_cycle_t *cycle) |
| { |
| 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) |
| { |
| ngx_test_null(index, |
| ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n, |
| cycle->log), |
| NGX_ERROR); |
| |
| if (event_index) { |
| ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents); |
| ngx_free(event_index); |
| } |
| event_index = index; |
| |
| #if 0 |
| if (ready_index) { |
| ngx_free(ready_index); |
| } |
| ngx_test_null(ready_index, |
| ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n, |
| cycle->log), |
| NGX_ERROR); |
| #endif |
| } |
| |
| ngx_io = ngx_os_io; |
| |
| ngx_event_actions = ngx_select_module_ctx.actions; |
| |
| ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_ONESHOT_EVENT; |
| |
| #if (NGX_WIN32) |
| max_read = max_write = 0; |
| #else |
| max_fd = -1; |
| #endif |
| |
| return NGX_OK; |
| } |
| |
| |
| static void ngx_select_done(ngx_cycle_t *cycle) |
| { |
| ngx_free(event_index); |
| #if 0 |
| ngx_free(ready_index); |
| #endif |
| |
| event_index = NULL; |
| } |
| |
| |
| static ngx_int_t ngx_select_add_event(ngx_event_t *ev, int event, u_int flags) |
| { |
| ngx_connection_t *c; |
| |
| c = ev->data; |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
| "select add event fd:%d ev:%d", c->fd, event); |
| |
| if (ev->index != NGX_INVALID_INDEX) { |
| ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
| "select event fd:%d ev:%d is already set", c->fd, event); |
| return NGX_OK; |
| } |
| |
| #if (NGX_WIN32) |
| |
| 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++; |
| } |
| |
| #else |
| |
| if (event == NGX_READ_EVENT) { |
| FD_SET(c->fd, &master_read_fd_set); |
| |
| } else if (event == NGX_WRITE_EVENT) { |
| FD_SET(c->fd, &master_write_fd_set); |
| } |
| |
| if (max_fd != -1 && max_fd < c->fd) { |
| max_fd = c->fd; |
| } |
| |
| #endif |
| |
| ev->active = 1; |
| ev->oneshot = (u_char) ((flags & NGX_ONESHOT_EVENT) ? 1 : 0); |
| |
| event_index[nevents] = ev; |
| ev->index = nevents; |
| nevents++; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t ngx_select_del_event(ngx_event_t *ev, int event, u_int flags) |
| { |
| 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:%d", c->fd, event); |
| |
| #if (NGX_WIN32) |
| |
| 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--; |
| } |
| |
| #else |
| |
| if (event == NGX_READ_EVENT) { |
| FD_CLR(c->fd, &master_read_fd_set); |
| |
| } else if (event == NGX_WRITE_EVENT) { |
| FD_CLR(c->fd, &master_write_fd_set); |
| } |
| |
| if (max_fd == c->fd) { |
| max_fd = -1; |
| } |
| |
| #endif |
| |
| if (ev->index < (u_int) --nevents) { |
| event_index[ev->index] = event_index[nevents]; |
| event_index[ev->index]->index = ev->index; |
| } |
| |
| ev->index = NGX_INVALID_INDEX; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle) |
| { |
| int ready, nready; |
| ngx_uint_t i, found, lock, expire; |
| ngx_err_t err; |
| ngx_msec_t timer; |
| ngx_event_t *ev; |
| ngx_connection_t *c; |
| ngx_epoch_msec_t delta; |
| struct timeval tv, *tp; |
| #if (HAVE_SELECT_CHANGE_TIMEOUT) |
| static ngx_epoch_msec_t deltas = 0; |
| #endif |
| |
| for ( ;; ) { |
| timer = ngx_event_find_timer(); |
| |
| if (timer != 0) { |
| break; |
| } |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select expired timer"); |
| |
| ngx_event_expire_timers((ngx_msec_t) |
| (ngx_elapsed_msec - ngx_old_elapsed_msec)); |
| } |
| |
| ngx_old_elapsed_msec = ngx_elapsed_msec; |
| |
| expire = 1; |
| |
| #if !(NGX_WIN32) |
| |
| 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; |
| } |
| } |
| } |
| |
| if (max_fd == -1) { |
| for (i = 0; i < nevents; i++) { |
| c = event_index[i]->data; |
| if (max_fd < c->fd) { |
| max_fd = c->fd; |
| } |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "change max_fd: %d", max_fd); |
| } |
| |
| #endif |
| |
| #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); |
| } |
| |
| #if !(NGX_WIN32) |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "max_fd: %d", max_fd); |
| #endif |
| } |
| #endif |
| |
| if (timer == NGX_TIMER_INFINITE) { |
| tp = NULL; |
| expire = 0; |
| |
| } else { |
| tv.tv_sec = timer / 1000; |
| tv.tv_usec = (timer % 1000) * 1000; |
| tp = &tv; |
| } |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select timer: %d", timer); |
| |
| work_read_fd_set = master_read_fd_set; |
| work_write_fd_set = master_write_fd_set; |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select read fd_set: %08Xd", *(int *) &work_read_fd_set); |
| |
| #if (NGX_WIN32) |
| ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp); |
| #else |
| ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp); |
| #endif |
| |
| if (ready == -1) { |
| err = ngx_socket_errno; |
| } else { |
| err = 0; |
| } |
| |
| #if (HAVE_SELECT_CHANGE_TIMEOUT) |
| |
| if (timer != NGX_TIMER_INFINITE) { |
| delta = timer - (tv.tv_sec * 1000 + tv.tv_usec / 1000); |
| |
| /* |
| * learn the real time and update the cached time |
| * if the sum of the last deltas overcomes 1 second |
| */ |
| |
| deltas += delta; |
| if (deltas > 1000) { |
| ngx_gettimeofday(&tv); |
| ngx_time_update(tv.tv_sec); |
| deltas = tv.tv_usec / 1000; |
| |
| ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 |
| + tv.tv_usec / 1000 - ngx_start_msec; |
| } else { |
| ngx_elapsed_msec += delta; |
| } |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select timer: %d, delta: %d", timer, (int) delta); |
| |
| } else { |
| delta = 0; |
| ngx_gettimeofday(&tv); |
| ngx_time_update(tv.tv_sec); |
| |
| ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 |
| + tv.tv_usec / 1000 - ngx_start_msec; |
| |
| if (ready == 0) { |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
| "select() returned no events without timeout"); |
| ngx_accept_mutex_unlock(); |
| return NGX_ERROR; |
| } |
| } |
| |
| #else /* !(HAVE_SELECT_CHANGE_TIMEOUT) */ |
| |
| 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; |
| |
| if (timer != NGX_TIMER_INFINITE) { |
| delta = ngx_elapsed_msec - delta; |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select timer: %d, delta: %d", timer, (int) delta); |
| |
| } else { |
| if (ready == 0) { |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, |
| "select() returned no events without timeout"); |
| ngx_accept_mutex_unlock(); |
| return NGX_ERROR; |
| } |
| } |
| |
| #endif /* HAVE_SELECT_CHANGE_TIMEOUT */ |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, |
| "select ready %d", ready); |
| |
| if (err) { |
| #if (NGX_WIN32) |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed"); |
| #else |
| ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT, |
| cycle->log, err, "select() failed"); |
| #endif |
| 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; 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; |
| |
| if (ev->oneshot) { |
| if (ev->timer_set) { |
| ngx_del_timer(ev); |
| } |
| |
| if (ev->write) { |
| ngx_select_del_event(ev, NGX_WRITE_EVENT, 0); |
| } else { |
| ngx_select_del_event(ev, NGX_READ_EVENT, 0); |
| } |
| } |
| |
| if (ev->accept) { |
| ev->next = accept_events; |
| accept_events = ev; |
| } else { |
| ngx_post_event(ev); |
| } |
| |
| nready++; |
| |
| #if 0 |
| ready_index[nready++] = ev; |
| #endif |
| } |
| } |
| |
| #if 0 |
| for (i = 0; i < nready; i++) { |
| ev = ready_index[i]; |
| ready--; |
| |
| if (!ev->active) { |
| continue; |
| } |
| |
| ev->ready = 1; |
| |
| if (ev->oneshot) { |
| if (ev->timer_set) { |
| ngx_del_timer(ev); |
| } |
| |
| if (ev->write) { |
| ngx_select_del_event(ev, NGX_WRITE_EVENT, 0); |
| } else { |
| ngx_select_del_event(ev, NGX_READ_EVENT, 0); |
| } |
| } |
| |
| ev->event_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->event_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 != nready) { |
| ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "select ready != events"); |
| } |
| |
| if (expire && delta) { |
| ngx_event_expire_timers((ngx_msec_t) delta); |
| } |
| |
| if (!ngx_threaded) { |
| ngx_event_process_posted(cycle); |
| } |
| |
| return NGX_OK; |
| } |
| |
| |
| 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; |
| } |
| |
| /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */ |
| |
| #if !(NGX_WIN32) |
| if ((unsigned) ecf->connections > FD_SETSIZE) { |
| ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, |
| "the maximum number of files " |
| "supported by select() is " ngx_value(FD_SETSIZE)); |
| return NGX_CONF_ERROR; |
| } |
| #endif |
| |
| #if (NGX_THREADS) && !(NGX_WIN32) |
| ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, |
| "select() is not supported in the threaded mode"); |
| return NGX_CONF_ERROR; |
| #else |
| return NGX_CONF_OK; |
| #endif |
| } |