2 Unix SMB/CIFS implementation.
4 generalised event loop handling
6 INTERNAL STRUCTS. THERE ARE NO API GUARANTEES.
7 External users should only ever have to include this header when
8 implementing new tevent backends.
10 Copyright (C) Stefan Metzmacher 2005-2009
12 ** NOTE! The following LGPL license applies to the tevent
13 ** library. This does NOT imply that all of Samba is released
16 This library is free software; you can redistribute it and/or
17 modify it under the terms of the GNU Lesser General Public
18 License as published by the Free Software Foundation; either
19 version 3 of the License, or (at your option) any later version.
21 This library is distributed in the hope that it will be useful,
22 but WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 Lesser General Public License for more details.
26 You should have received a copy of the GNU Lesser General Public
27 License along with this library; if not, see <http://www.gnu.org/licenses/>.
32 * @brief What to do on completion
34 * This is used for the user of an async request, fn is called when
35 * the request completes, either successfully or with an error.
39 * @brief Completion function
40 * Completion function, to be filled by the API user
44 * @brief Private data for the completion function
50 * @brief Private state pointer for the actual implementation
52 * The implementation doing the work for the async request needs to
53 * keep around current data like for example a fd event. The user of
54 * an async request should not touch this.
59 * @brief A function to overwrite the default print function
61 * The implementation doing the work may want to implement a
62 * custom function to print the text representation of the async
65 tevent_req_print_fn private_print;
68 * @brief A function to cancel the request
70 * The implementation might want to set a function
71 * that is called when the tevent_req_cancel() function
74 tevent_req_cancel_fn private_cancel;
77 * @brief A function to cleanup the request
79 * The implementation might want to set a function
80 * that is called before the tevent_req_done() and tevent_req_error()
81 * trigger the callers callback function.
84 tevent_req_cleanup_fn fn;
85 enum tevent_req_state state;
89 * @brief Internal state of the request
91 * Callers should only access this via functions and never directly.
95 * @brief The talloc type of the data pointer
97 * This is filled by the tevent_req_create() macro.
99 * This for debugging only.
101 const char *private_type;
104 * @brief The location where the request was created
106 * This uses the __location__ macro via the tevent_req_create()
109 * This for debugging only.
111 const char *create_location;
114 * @brief The location where the request was finished
116 * This uses the __location__ macro via the tevent_req_done(),
117 * tevent_req_error() or tevent_req_nomem() macro.
119 * This for debugging only.
121 const char *finish_location;
124 * @brief The location where the request was canceled
126 * This uses the __location__ macro via the
127 * tevent_req_cancel() macro.
129 * This for debugging only.
131 const char *cancel_location;
134 * @brief The external state - will be queried by the caller
136 * While the async request is being processed, state will remain in
137 * TEVENT_REQ_IN_PROGRESS. A request is finished if
138 * req->state>=TEVENT_REQ_DONE.
140 enum tevent_req_state state;
143 * @brief status code when finished
145 * This status can be queried in the async completion function. It
146 * will be set to 0 when everything went fine.
151 * @brief the immediate event used by tevent_req_post
154 struct tevent_immediate *trigger;
157 * @brief An event context which will be used to
158 * defer the _tevent_req_notify_callback().
160 struct tevent_context *defer_callback_ev;
163 * @brief the timer event if tevent_req_set_endtime was used
166 struct tevent_timer *timer;
171 struct tevent_fd *prev, *next;
172 struct tevent_context *event_ctx;
174 uint16_t flags; /* see TEVENT_FD_* flags */
175 tevent_fd_handler_t handler;
176 tevent_fd_close_fn_t close_fn;
177 /* this is private for the specific handler */
179 /* this is for debugging only! */
180 const char *handler_name;
181 const char *location;
182 /* this is private for the events_ops implementation */
183 uint64_t additional_flags;
184 void *additional_data;
187 struct tevent_timer {
188 struct tevent_timer *prev, *next;
189 struct tevent_context *event_ctx;
190 struct timeval next_event;
191 tevent_timer_handler_t handler;
192 /* this is private for the specific handler */
194 /* this is for debugging only! */
195 const char *handler_name;
196 const char *location;
197 /* this is private for the events_ops implementation */
198 void *additional_data;
201 struct tevent_immediate {
202 struct tevent_immediate *prev, *next;
203 struct tevent_context *event_ctx;
204 tevent_immediate_handler_t handler;
205 /* this is private for the specific handler */
207 /* this is for debugging only! */
208 const char *handler_name;
209 const char *create_location;
210 const char *schedule_location;
211 /* this is private for the events_ops implementation */
212 void (*cancel_fn)(struct tevent_immediate *im);
213 void *additional_data;
216 struct tevent_signal {
217 struct tevent_signal *prev, *next;
218 struct tevent_context *event_ctx;
221 tevent_signal_handler_t handler;
222 /* this is private for the specific handler */
224 /* this is for debugging only! */
225 const char *handler_name;
226 const char *location;
227 /* this is private for the events_ops implementation */
228 void *additional_data;
231 struct tevent_threaded_context {
232 struct tevent_threaded_context *next, *prev;
233 struct tevent_context *event_ctx;
236 struct tevent_debug_ops {
237 void (*debug)(void *context, enum tevent_debug_level level,
238 const char *fmt, va_list ap) PRINTF_ATTRIBUTE(3,0);
242 void tevent_debug(struct tevent_context *ev, enum tevent_debug_level level,
243 const char *fmt, ...) PRINTF_ATTRIBUTE(3,4);
245 struct tevent_context {
246 /* the specific events implementation */
247 const struct tevent_ops *ops;
250 * The following three pointers are queried on every loop_once
251 * in the order in which they appear here. Not measured, but
252 * hopefully putting them at the top together with "ops"
253 * should make tevent a *bit* more cache-friendly than before.
256 /* list of signal events - used by common code */
257 struct tevent_signal *signal_events;
259 /* List of threaded job indicators */
260 struct tevent_threaded_context *threaded_contexts;
262 /* list of immediate events - used by common code */
263 struct tevent_immediate *immediate_events;
265 /* list of fd events - used by common code */
266 struct tevent_fd *fd_events;
268 /* list of timed events - used by common code */
269 struct tevent_timer *timer_events;
271 /* List of scheduled immediates */
272 pthread_mutex_t scheduled_mutex;
273 struct tevent_immediate *scheduled_immediates;
275 /* this is private for the events_ops implementation */
276 void *additional_data;
278 /* pipe hack used with signal handlers */
279 struct tevent_fd *wakeup_fde;
281 #ifndef HAVE_EVENT_FD
285 /* debugging operations */
286 struct tevent_debug_ops debug_ops;
288 /* info about the nesting status */
292 tevent_nesting_hook hook_fn;
297 tevent_trace_callback_t callback;
302 * an optimization pointer into timer_events
303 * used by used by common code via
304 * tevent_common_add_timer_v2()
306 struct tevent_timer *last_zero_timer;
309 struct tevent_context *prev, *next;
313 const struct tevent_ops *tevent_find_ops_byname(const char *name);
315 int tevent_common_context_destructor(struct tevent_context *ev);
316 int tevent_common_loop_wait(struct tevent_context *ev,
317 const char *location);
319 int tevent_common_fd_destructor(struct tevent_fd *fde);
320 struct tevent_fd *tevent_common_add_fd(struct tevent_context *ev,
324 tevent_fd_handler_t handler,
326 const char *handler_name,
327 const char *location);
328 void tevent_common_fd_set_close_fn(struct tevent_fd *fde,
329 tevent_fd_close_fn_t close_fn);
330 uint16_t tevent_common_fd_get_flags(struct tevent_fd *fde);
331 void tevent_common_fd_set_flags(struct tevent_fd *fde, uint16_t flags);
333 struct tevent_timer *tevent_common_add_timer(struct tevent_context *ev,
335 struct timeval next_event,
336 tevent_timer_handler_t handler,
338 const char *handler_name,
339 const char *location);
340 struct tevent_timer *tevent_common_add_timer_v2(struct tevent_context *ev,
342 struct timeval next_event,
343 tevent_timer_handler_t handler,
345 const char *handler_name,
346 const char *location);
347 struct timeval tevent_common_loop_timer_delay(struct tevent_context *);
349 void tevent_common_schedule_immediate(struct tevent_immediate *im,
350 struct tevent_context *ev,
351 tevent_immediate_handler_t handler,
353 const char *handler_name,
354 const char *location);
355 bool tevent_common_loop_immediate(struct tevent_context *ev);
356 void tevent_common_threaded_activate_immediate(struct tevent_context *ev);
358 bool tevent_common_have_events(struct tevent_context *ev);
359 int tevent_common_wakeup_init(struct tevent_context *ev);
360 int tevent_common_wakeup(struct tevent_context *ev);
362 struct tevent_signal *tevent_common_add_signal(struct tevent_context *ev,
366 tevent_signal_handler_t handler,
368 const char *handler_name,
369 const char *location);
370 int tevent_common_check_signal(struct tevent_context *ev);
371 void tevent_cleanup_pending_signal_handlers(struct tevent_signal *se);
373 bool tevent_standard_init(void);
374 bool tevent_select_init(void);
375 bool tevent_poll_init(void);
376 void tevent_poll_event_add_fd_internal(struct tevent_context *ev,
377 struct tevent_fd *fde);
378 bool tevent_poll_mt_init(void);
380 bool tevent_epoll_init(void);
381 void tevent_epoll_set_panic_fallback(struct tevent_context *ev,
382 bool (*panic_fallback)(struct tevent_context *ev,
385 #ifdef HAVE_SOLARIS_PORTS
386 bool tevent_port_init(void);
388 bool tevent_kqueue_init(void);
389 bool tevent_kqueue_set_panic_fallback(struct tevent_context *ev,
390 bool (*panic_fallback)(struct tevent_context *ev,
392 #ifndef HAVE_SYS_EVENT_H
394 uintptr_t ident; /* identifier for this event */
395 short filter; /* filter for event */
396 #define EVFILT_WRITE 1
397 #define EVFILT_READ 2
398 u_short flags; /* action flags for kqueue */
399 #define EV_ADD 0x0001
400 #define EV_ENABLE 0x0002
401 #define EV_DISABLE 0x0004
402 #define EV_DELETE 0x0008
403 #define EV_EOF 0x0010
404 u_int fflags; /* filter flag value */
405 intptr_t data; /* filter data value */
406 void *udata; /* opaque user data identifier */
409 #define EV_SET(_kev, _ident, _filter, _flags, _fflags, _data, _udata) do { \
410 struct kevent *__kev = _kev; \
411 __kev->ident = _ident; \
412 __kev->filter = _filter; \
413 __kev->flags = _flags; \
414 __kev->fflags = _fflags; \
415 __kev->data = (intptr_t)_data; \
416 __kev->udata = _udata; \
419 static inline int kqueue(void)
426 static inline int kevent(int kq, const struct kevent *changelist, int nchanges,
427 struct kevent *eventlist, int nevents,
428 const struct timespec *timeout)
433 #endif /* not HAVE_SYS_EVENT_H */
437 void tevent_trace_point_callback(struct tevent_context *ev,
438 enum tevent_trace_point);