diff options
Diffstat (limited to 'app/nginx/src/event/modules/ngx_poll_module.c')
| -rw-r--r-- | app/nginx/src/event/modules/ngx_poll_module.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/app/nginx/src/event/modules/ngx_poll_module.c b/app/nginx/src/event/modules/ngx_poll_module.c new file mode 100644 index 0000000..4e03dab --- /dev/null +++ b/app/nginx/src/event/modules/ngx_poll_module.c @@ -0,0 +1,415 @@ + +/* + * 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_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer); +static void ngx_poll_done(ngx_cycle_t *cycle); +static ngx_int_t ngx_poll_add_event(ngx_event_t *ev, ngx_int_t event, + ngx_uint_t flags); +static ngx_int_t ngx_poll_del_event(ngx_event_t *ev, ngx_int_t event, + ngx_uint_t flags); +static ngx_int_t ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, + ngx_uint_t flags); +static char *ngx_poll_init_conf(ngx_cycle_t *cycle, void *conf); + + +static struct pollfd *event_list; +static ngx_uint_t nevents; + + +static ngx_str_t poll_name = ngx_string("poll"); + +static 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, /* trigger a notify */ + 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 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_poll_init(ngx_cycle_t *cycle, ngx_msec_t timer) +{ + 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; + } + + ngx_io = ngx_os_io; + + ngx_event_actions = ngx_poll_module_ctx.actions; + + ngx_event_flags = NGX_USE_LEVEL_EVENT|NGX_USE_FD_EVENT; + + return NGX_OK; +} + + +static void +ngx_poll_done(ngx_cycle_t *cycle) +{ + ngx_free(event_list); + + event_list = NULL; +} + + +static ngx_int_t +ngx_poll_add_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 = 1; + + if (ev->index != NGX_INVALID_INDEX) { + ngx_log_error(NGX_LOG_ALERT, ev->log, 0, + "poll event fd:%d ev:%i 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:%i", c->fd, event); + + if (e == NULL || e->index == NGX_INVALID_INDEX) { + event_list[nevents].fd = c->fd; + event_list[nevents].events = (short) event; + event_list[nevents].revents = 0; + + ev->index = nevents; + nevents++; + + } else { + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "poll add index: %i", e->index); + + event_list[e->index].events |= (short) event; + ev->index = e->index; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_poll_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) { + ngx_log_error(NGX_LOG_ALERT, ev->log, 0, + "poll event fd:%d ev:%i 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:%i", c->fd, event); + + if (e == NULL || e->index == NGX_INVALID_INDEX) { + nevents--; + + if (ev->index < nevents) { + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "index: copy event %ui to %i", nevents, ev->index); + + event_list[ev->index] = event_list[nevents]; + + c = ngx_cycle->files[event_list[nevents].fd]; + + if (c->fd == -1) { + ngx_log_error(NGX_LOG_ALERT, ev->log, 0, + "unexpected last event"); + + } else { + if (c->read->index == nevents) { + c->read->index = ev->index; + } + + if (c->write->index == nevents) { + c->write->index = ev->index; + } + } + } + + } else { + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "poll del index: %i", e->index); + + event_list[e->index].events &= (short) ~event; + } + + ev->index = NGX_INVALID_INDEX; + + return NGX_OK; +} + + +static ngx_int_t +ngx_poll_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags) +{ + int ready, revents; + ngx_err_t err; + ngx_uint_t i, found, level; + ngx_event_t *ev; + ngx_queue_t *queue; + ngx_connection_t *c; + + /* NGX_TIMER_INFINITE == INFTIM */ + +#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: %ui: fd:%d ev:%04Xd", + i, event_list[i].fd, event_list[i].events); + } + } +#endif + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "poll timer: %M", timer); + + ready = poll(event_list, (u_int) nevents, (int) timer); + + err = (ready == -1) ? ngx_errno : 0; + + if (flags & NGX_UPDATE_TIME || ngx_event_timer_alarm) { + ngx_time_update(); + } + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "poll ready %d of %ui", ready, nevents); + + if (err) { + if (err == NGX_EINTR) { + + if (ngx_event_timer_alarm) { + ngx_event_timer_alarm = 0; + return NGX_OK; + } + + level = NGX_LOG_INFO; + + } else { + level = NGX_LOG_ALERT; + } + + ngx_log_error(level, cycle->log, err, "poll() failed"); + return NGX_ERROR; + } + + if (ready == 0) { + if (timer != NGX_TIMER_INFINITE) { + return NGX_OK; + } + + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, + "poll() returned no events without timeout"); + return NGX_ERROR; + } + + for (i = 0; i < nevents && ready; i++) { + + revents = event_list[i].revents; + +#if 1 + ngx_log_debug4(NGX_LOG_DEBUG_EVENT, cycle->log, 0, + "poll: %ui: 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: %ui: 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->files[event_list[i].fd]; + + 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)) { + + /* + * if the error events were returned, add POLLIN and POLLOUT + * to handle the events at least in one active handler + */ + + revents |= POLLIN|POLLOUT; + } + + found = 0; + + if ((revents & POLLIN) && c->read->active) { + found = 1; + + ev = c->read; + ev->ready = 1; + + queue = ev->accept ? &ngx_posted_accept_events + : &ngx_posted_events; + + ngx_post_event(ev, queue); + } + + if ((revents & POLLOUT) && c->write->active) { + found = 1; + + ev = c->write; + ev->ready = 1; + + ngx_post_event(ev, &ngx_posted_events); + } + + if (found) { + ready--; + continue; + } + } + + if (ready != 0) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "poll ready != events"); + } + + return NGX_OK; +} + + +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; + } + + return NGX_CONF_OK; +} |