diff options
Diffstat (limited to 'src/event/modules/ngx_epoll_module.c')
| -rw-r--r-- | src/event/modules/ngx_epoll_module.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/src/event/modules/ngx_epoll_module.c b/src/event/modules/ngx_epoll_module.c new file mode 100644 index 000000000..e8d4a7278 --- /dev/null +++ b/src/event/modules/ngx_epoll_module.c @@ -0,0 +1,344 @@ + +/* + * Copyright (C) 2002-2004 Igor Sysoev, http://sysoev.ru/en/ + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#if (TEST_BUILD_EPOLL) + +/* epoll declarations */ + +#define EPOLLIN 0x001 +#define EPOLLPRI 0x002 +#define EPOLLOUT 0x004 +#define EPOLLRDNORM 0x040 +#define EPOLLRDBAND 0x080 +#define EPOLLWRNORM 0x100 +#define EPOLLWRBAND 0x200 +#define EPOLLMSG 0x400 +#define EPOLLERR 0x008 +#define EPOLLHUP 0x010 + +#define EPOLL_CTL_ADD 1 +#define EPOLL_CTL_DEL 2 +#define EPOLL_CTL_MOD 3 + +typedef union epoll_data { + void *ptr; + int fd; + uint32_t u32; + uint64_t u64; +} epoll_data_t; + +struct epoll_event { + uint32_t events; + epoll_data_t data; +}; + +int epoll_create(int size); +int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event); +int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout); + +int epoll_create(int size) +{ + return -1; +} + +int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event) +{ + return -1; +} + +int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout) +{ + return -1; +} + +#endif + + +typedef struct { + u_int events; +} ngx_epoll_conf_t; + + +static int ngx_epoll_init(ngx_cycle_t *cycle); +static void ngx_epoll_done(ngx_cycle_t *cycle); +static int ngx_epoll_add_connection(ngx_connection_t *c); +static int ngx_epoll_del_connection(ngx_connection_t *c); +static int ngx_epoll_process_events(ngx_log_t *log); + +static void *ngx_epoll_create_conf(ngx_cycle_t *cycle); +static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf); + +static int ep = -1; +static struct epoll_event *event_list; +static u_int nevents; + + +static ngx_str_t epoll_name = ngx_string("epoll"); + +static ngx_command_t ngx_epoll_commands[] = { + + {ngx_string("epoll_events"), + NGX_EVENT_CONF|NGX_CONF_TAKE1, + ngx_conf_set_num_slot, + 0, + offsetof(ngx_epoll_conf_t, events), + NULL}, + + ngx_null_command +}; + + +ngx_event_module_t ngx_epoll_module_ctx = { + &epoll_name, + ngx_epoll_create_conf, /* create configuration */ + ngx_epoll_init_conf, /* init configuration */ + + { + NULL, /* add an event */ + NULL, /* delete an event */ + NULL, /* enable an event */ + NULL, /* disable an event */ + ngx_epoll_add_connection, /* add an connection */ + ngx_epoll_del_connection, /* delete an connection */ + ngx_epoll_process_events, /* process the events */ + ngx_epoll_init, /* init the events */ + ngx_epoll_done, /* done the events */ + } + +}; + +ngx_module_t ngx_epoll_module = { + NGX_MODULE, + &ngx_epoll_module_ctx, /* module context */ + ngx_epoll_commands, /* module directives */ + NGX_EVENT_MODULE, /* module type */ + NULL, /* init module */ + NULL /* init child */ +}; + + +static int ngx_epoll_init(ngx_cycle_t *cycle) +{ + size_t n; + ngx_epoll_conf_t *epcf; + + epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module); + + if (ep == -1) { + ep = epoll_create(/* STUB: open_files / 2 */ 512); + + if (ep == -1) { + ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, + "epoll_create() failed"); + return NGX_ERROR; + } + } + + if (nevents < epcf->events) { + if (event_list) { + ngx_free(event_list); + } + + event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events, + cycle->log); + if (event_list == NULL) { + return NGX_ERROR; + } + } + + nevents = epcf->events; + + ngx_io = ngx_os_io; + + ngx_event_actions = ngx_epoll_module_ctx.actions; + + ngx_event_flags = NGX_USE_EDGE_EVENT; + + return NGX_OK; +} + + +static void ngx_epoll_done(ngx_cycle_t *cycle) +{ + if (close(ep) == -1) { + ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, + "epoll close() failed"); + } + + ep = -1; + + ngx_free(event_list); + + event_list = NULL; + nevents = 0; +} + + +static int ngx_epoll_add_connection(ngx_connection_t *c) +{ + struct epoll_event ev; + + ev.events = EPOLLIN|EPOLLOUT; + ev.data.ptr = (void *) ((uintptr_t) c | c->read->instance); + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, + "epoll add connection: fd:%d ev:%04X", c->fd, ev.events); + + if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ev) == -1) { + ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, + "epoll_ctl(#%d) failed", c->fd); + return NGX_ERROR; + } + + return NGX_OK; +} + + +static int ngx_epoll_del_connection(ngx_connection_t *c) +{ + c->read->active = 0; + c->write->active = 0; + + return NGX_OK; +} + + +int ngx_epoll_process_events(ngx_log_t *log) +{ + int events; + ngx_int_t instance, i; + size_t n; + ngx_msec_t timer; + ngx_err_t err; + ngx_cycle_t **cycle; + struct timeval tv; + ngx_connection_t *c; + ngx_epoch_msec_t delta; + + + timer = ngx_event_find_timer(); + ngx_old_elapsed_msec = ngx_elapsed_msec; + + if (timer == 0) { + timer = (ngx_msec_t) -1; + } + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, log, 0, "epoll timer: %d", timer); + + events = epoll_wait(ep, event_list, nevents, timer); + + if (events == -1) { + err = ngx_errno; + } else { + err = 0; + } + + ngx_gettimeofday(&tv); + ngx_time_update(tv.tv_sec); + + delta = ngx_elapsed_msec; + ngx_elapsed_msec = tv.tv_sec * 1000 + tv.tv_usec / 1000 - ngx_start_msec; + + if ((int) timer != INFTIM) { + delta = ngx_elapsed_msec - delta; + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0, + "epoll timer: %d, delta: %d", timer, (int) delta); + } else { + if (events == 0) { + ngx_log_error(NGX_LOG_ALERT, log, 0, + "epoll_wait() returned no events without timeout"); + return NGX_ERROR; + } + } + + if (err) { + ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT, + log, err, "epoll_wait() failed"); + return NGX_ERROR; + } + + for (i = 0; i < events; i++) { + c = event_list[i].data.ptr; + + instance = (uintptr_t) c & 1; + c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1); + + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0, + "epoll: fd:%d ev:%04X d:" PTR_FMT, + c->fd, event_list[i].events, event_list[i].data); + + if (c->read->instance != instance) { + + /* + * it's a stale event from a file descriptor + * that was just closed in this iteration + */ + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, log, 0, + "epoll: stale event " PTR_FMT, c); + continue; + } + + if (event_list[i].events & EPOLLIN) { + if (!c->read->active) { + continue; + } + + c->read->ready = 1; + c->read->event_handler(c->read); + } + + if (event_list[i].events & EPOLLOUT) { + if (!c->write->active) { + continue; + } + + c->write->ready = 1; + c->write->event_handler(c->write); + } + + if (event_list[i].events & (EPOLLERR|EPOLLHUP|EPOLLMSG)) { + ngx_log_error(NGX_LOG_ERR, log, 0, + "epoll_wait() error on fd:%d ev:%d", + c->fd, event_list[i].events); + } + } + + if (timer != (ngx_msec_t) -1 && delta) { + ngx_event_expire_timers((ngx_msec_t) delta); + } + + return NGX_OK; +} + + +static void *ngx_epoll_create_conf(ngx_cycle_t *cycle) +{ + ngx_epoll_conf_t *epcf; + + ngx_test_null(epcf, ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t)), + NGX_CONF_ERROR); + + epcf->events = NGX_CONF_UNSET; + + return epcf; +} + + +static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf) +{ + ngx_epoll_conf_t *epcf = conf; + + ngx_conf_init_unsigned_value(epcf->events, 512); + + return NGX_CONF_OK; +} |