3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
8 #ifndef _NGX_EVENT_H_INCLUDED_
9 #define _NGX_EVENT_H_INCLUDED_
12 #include <ngx_config.h>
16 #define NGX_INVALID_INDEX 0xd0d0d0d0
37 /* used to detect the stale events in kqueue and epoll */
41 * the event was passed or would be passed to a kernel;
42 * in aio mode - operation was posted.
48 /* the ready event; in aio mode 0 means that no operation can be posted */
53 /* aio operation is complete */
64 unsigned deferred_accept:1;
66 /* the pending eof reported by kqueue, epoll or in aio chain operation */
67 unsigned pending_eof:1;
73 /* to test on worker exit */
77 unsigned cancelable:1;
82 /* the pending errno reported by kqueue */
88 * accept: number of sockets that wait to be accepted
89 * read: bytes to read when event is ready
90 * or lowat when event is set with NGX_LOWAT_EVENT flag
91 * write: available space in buffer when event is ready
92 * or lowat when event is set with NGX_LOWAT_EVENT flag
94 * epoll with EPOLLRDHUP:
95 * accept: 1 if accept many, 0 otherwise
96 * read: 1 if there can be data to read, 0 otherwise
101 * accept: 1 if accept many, 0 otherwise
104 #if (NGX_HAVE_KQUEUE) || (NGX_HAVE_IOCP)
107 unsigned available:1;
110 ngx_event_handler_pt handler;
114 ngx_event_ovlp_t ovlp;
121 ngx_rbtree_node_t timer;
123 /* the posted queue */
128 /* the threads support */
131 * the event thread context, we store it here
132 * if $(CC) does not understand __thread declaration
133 * and pthread_getspecific() is too costly
138 #if (NGX_EVENT_T_PADDING)
140 /* event should not cross cache line in SMP */
142 uint32_t padding[NGX_EVENT_T_PADDING];
148 #if (NGX_HAVE_FILE_AIO)
150 struct ngx_event_aio_s {
152 ngx_event_handler_pt handler;
155 #if (NGX_HAVE_AIO_SENDFILE || NGX_COMPAT)
156 ssize_t (*preload_handler)(ngx_buf_t *file);
161 #if (NGX_HAVE_EVENTFD)
165 #if !(NGX_HAVE_EVENTFD) || (NGX_TEST_BUILD_EPOLL)
178 ngx_int_t (*add)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);
179 ngx_int_t (*del)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);
181 ngx_int_t (*enable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);
182 ngx_int_t (*disable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);
184 ngx_int_t (*add_conn)(ngx_connection_t *c);
185 ngx_int_t (*del_conn)(ngx_connection_t *c, ngx_uint_t flags);
187 ngx_int_t (*notify)(ngx_event_handler_pt handler);
189 ngx_int_t (*process_events)(ngx_cycle_t *cycle, ngx_msec_t timer,
192 ngx_int_t (*init)(ngx_cycle_t *cycle, ngx_msec_t timer);
193 void (*done)(ngx_cycle_t *cycle);
194 } ngx_event_actions_t;
197 extern ngx_event_actions_t ngx_event_actions;
198 #if (NGX_HAVE_EPOLLRDHUP)
199 extern ngx_uint_t ngx_use_epoll_rdhup;
204 * The event filter requires to read/write the whole data:
205 * select, poll, /dev/poll, kqueue, epoll.
207 #define NGX_USE_LEVEL_EVENT 0x00000001
210 * The event filter is deleted after a notification without an additional
211 * syscall: kqueue, epoll.
213 #define NGX_USE_ONESHOT_EVENT 0x00000002
216 * The event filter notifies only the changes and an initial level:
219 #define NGX_USE_CLEAR_EVENT 0x00000004
222 * The event filter has kqueue features: the eof flag, errno,
223 * available data, etc.
225 #define NGX_USE_KQUEUE_EVENT 0x00000008
228 * The event filter supports low water mark: kqueue's NOTE_LOWAT.
229 * kqueue in FreeBSD 4.1-4.2 has no NOTE_LOWAT so we need a separate flag.
231 #define NGX_USE_LOWAT_EVENT 0x00000010
234 * The event filter requires to do i/o operation until EAGAIN: epoll.
236 #define NGX_USE_GREEDY_EVENT 0x00000020
239 * The event filter is epoll.
241 #define NGX_USE_EPOLL_EVENT 0x00000040
246 #define NGX_USE_RTSIG_EVENT 0x00000080
251 #define NGX_USE_AIO_EVENT 0x00000100
254 * Need to add socket or handle only once: i/o completion port.
256 #define NGX_USE_IOCP_EVENT 0x00000200
259 * The event filter has no opaque data and requires file descriptors table:
262 #define NGX_USE_FD_EVENT 0x00000400
265 * The event module handles periodic or absolute timer event by itself:
266 * kqueue in FreeBSD 4.4, NetBSD 2.0, and MacOSX 10.4, Solaris 10's event ports.
268 #define NGX_USE_TIMER_EVENT 0x00000800
271 * All event filters on file descriptor are deleted after a notification:
272 * Solaris 10's event ports.
274 #define NGX_USE_EVENTPORT_EVENT 0x00001000
277 * The event filter support vnode notifications: kqueue.
279 #define NGX_USE_VNODE_EVENT 0x00002000
283 * The event filter is deleted just before the closing file.
284 * Has no meaning for select and poll.
285 * kqueue, epoll, eventport: allows to avoid explicit delete,
286 * because filter automatically is deleted
289 * /dev/poll: we need to flush POLLREMOVE event
290 * before closing file.
292 #define NGX_CLOSE_EVENT 1
295 * disable temporarily event filter, this may avoid locks
296 * in kernel malloc()/free(): kqueue.
298 #define NGX_DISABLE_EVENT 2
301 * event must be passed to kernel right now, do not wait until batch processing.
303 #define NGX_FLUSH_EVENT 4
306 /* these flags have a meaning only for kqueue */
307 #define NGX_LOWAT_EVENT 0
308 #define NGX_VNODE_EVENT 0
311 #if (NGX_HAVE_EPOLL) && !(NGX_HAVE_EPOLLRDHUP)
316 #if (NGX_HAVE_KQUEUE)
318 #define NGX_READ_EVENT EVFILT_READ
319 #define NGX_WRITE_EVENT EVFILT_WRITE
321 #undef NGX_VNODE_EVENT
322 #define NGX_VNODE_EVENT EVFILT_VNODE
325 * NGX_CLOSE_EVENT, NGX_LOWAT_EVENT, and NGX_FLUSH_EVENT are the module flags
326 * and they must not go into a kernel so we need to choose the value
327 * that must not interfere with any existent and future kqueue flags.
328 * kqueue has such values - EV_FLAG1, EV_EOF, and EV_ERROR:
329 * they are reserved and cleared on a kernel entrance.
331 #undef NGX_CLOSE_EVENT
332 #define NGX_CLOSE_EVENT EV_EOF
334 #undef NGX_LOWAT_EVENT
335 #define NGX_LOWAT_EVENT EV_FLAG1
337 #undef NGX_FLUSH_EVENT
338 #define NGX_FLUSH_EVENT EV_ERROR
340 #define NGX_LEVEL_EVENT 0
341 #define NGX_ONESHOT_EVENT EV_ONESHOT
342 #define NGX_CLEAR_EVENT EV_CLEAR
344 #undef NGX_DISABLE_EVENT
345 #define NGX_DISABLE_EVENT EV_DISABLE
348 #elif (NGX_HAVE_DEVPOLL && !(NGX_TEST_BUILD_DEVPOLL)) \
349 || (NGX_HAVE_EVENTPORT && !(NGX_TEST_BUILD_EVENTPORT))
351 #define NGX_READ_EVENT POLLIN
352 #define NGX_WRITE_EVENT POLLOUT
354 #define NGX_LEVEL_EVENT 0
355 #define NGX_ONESHOT_EVENT 1
358 #elif (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
360 #define NGX_READ_EVENT (EPOLLIN|EPOLLRDHUP)
361 #define NGX_WRITE_EVENT EPOLLOUT
363 #define NGX_LEVEL_EVENT 0
364 #define NGX_CLEAR_EVENT EPOLLET
365 #define NGX_ONESHOT_EVENT 0x70000000
367 #define NGX_ONESHOT_EVENT EPOLLONESHOT
370 #if (NGX_HAVE_EPOLLEXCLUSIVE)
371 #define NGX_EXCLUSIVE_EVENT EPOLLEXCLUSIVE
374 #elif (NGX_HAVE_POLL)
376 #define NGX_READ_EVENT POLLIN
377 #define NGX_WRITE_EVENT POLLOUT
379 #define NGX_LEVEL_EVENT 0
380 #define NGX_ONESHOT_EVENT 1
385 #define NGX_READ_EVENT 0
386 #define NGX_WRITE_EVENT 1
388 #define NGX_LEVEL_EVENT 0
389 #define NGX_ONESHOT_EVENT 1
391 #endif /* NGX_HAVE_KQUEUE */
395 #define NGX_IOCP_ACCEPT 0
396 #define NGX_IOCP_IO 1
397 #define NGX_IOCP_CONNECT 2
401 #if (NGX_TEST_BUILD_EPOLL)
402 #define NGX_EXCLUSIVE_EVENT 0
406 #ifndef NGX_CLEAR_EVENT
407 #define NGX_CLEAR_EVENT 0 /* dummy declaration */
411 #define ngx_process_events ngx_event_actions.process_events
412 #define ngx_done_events ngx_event_actions.done
414 #define ngx_add_event ngx_event_actions.add
415 #define ngx_del_event ngx_event_actions.del
416 #define ngx_add_conn ngx_event_actions.add_conn
417 #define ngx_del_conn ngx_event_actions.del_conn
419 #define ngx_notify ngx_event_actions.notify
421 #define ngx_add_timer ngx_event_add_timer
422 #define ngx_del_timer ngx_event_del_timer
425 extern ngx_os_io_t ngx_io;
427 #define ngx_recv ngx_io.recv
428 #define ngx_recv_chain ngx_io.recv_chain
429 #define ngx_udp_recv ngx_io.udp_recv
430 #define ngx_send ngx_io.send
431 #define ngx_send_chain ngx_io.send_chain
432 #define ngx_udp_send ngx_io.udp_send
433 #define ngx_udp_send_chain ngx_io.udp_send_chain
436 #define NGX_EVENT_MODULE 0x544E5645 /* "EVNT" */
437 #define NGX_EVENT_CONF 0x02000000
441 ngx_uint_t connections;
444 ngx_flag_t multi_accept;
445 ngx_flag_t accept_mutex;
447 ngx_msec_t accept_mutex_delay;
452 ngx_array_t debug_connection;
460 void *(*create_conf)(ngx_cycle_t *cycle);
461 char *(*init_conf)(ngx_cycle_t *cycle, void *conf);
463 ngx_event_actions_t actions;
464 } ngx_event_module_t;
467 extern ngx_atomic_t *ngx_connection_counter;
469 extern ngx_atomic_t *ngx_accept_mutex_ptr;
470 extern ngx_shmtx_t ngx_accept_mutex;
471 extern ngx_uint_t ngx_use_accept_mutex;
472 extern ngx_uint_t ngx_accept_events;
473 extern ngx_uint_t ngx_accept_mutex_held;
474 extern ngx_msec_t ngx_accept_mutex_delay;
475 extern ngx_int_t ngx_accept_disabled;
480 extern ngx_atomic_t *ngx_stat_accepted;
481 extern ngx_atomic_t *ngx_stat_handled;
482 extern ngx_atomic_t *ngx_stat_requests;
483 extern ngx_atomic_t *ngx_stat_active;
484 extern ngx_atomic_t *ngx_stat_reading;
485 extern ngx_atomic_t *ngx_stat_writing;
486 extern ngx_atomic_t *ngx_stat_waiting;
491 #define NGX_UPDATE_TIME 1
492 #define NGX_POST_EVENTS 2
495 extern sig_atomic_t ngx_event_timer_alarm;
496 extern ngx_uint_t ngx_event_flags;
497 extern ngx_module_t ngx_events_module;
498 extern ngx_module_t ngx_event_core_module;
501 #define ngx_event_get_conf(conf_ctx, module) \
502 (*(ngx_get_conf(conf_ctx, ngx_events_module))) [module.ctx_index];
506 void ngx_event_accept(ngx_event_t *ev);
508 void ngx_event_recvmsg(ngx_event_t *ev);
510 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle);
511 u_char *ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len);
514 void ngx_process_events_and_timers(ngx_cycle_t *cycle);
515 ngx_int_t ngx_handle_read_event(ngx_event_t *rev, ngx_uint_t flags);
516 ngx_int_t ngx_handle_write_event(ngx_event_t *wev, size_t lowat);
520 void ngx_event_acceptex(ngx_event_t *ev);
521 ngx_int_t ngx_event_post_acceptex(ngx_listening_t *ls, ngx_uint_t n);
522 u_char *ngx_acceptex_log_error(ngx_log_t *log, u_char *buf, size_t len);
526 ngx_int_t ngx_send_lowat(ngx_connection_t *c, size_t lowat);
529 /* used in ngx_log_debugX() */
530 #define ngx_event_ident(p) ((ngx_connection_t *) (p))->fd
533 #include <ngx_event_timer.h>
534 #include <ngx_event_posted.h>
537 #include <ngx_iocp_module.h>
541 #endif /* _NGX_EVENT_H_INCLUDED_ */