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Comparing libev/ev.h (file contents):
Revision 1.3 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.73 by root, Tue Nov 27 19:41:52 2007 UTC

1/*
2 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials provided
15 * with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
1#ifndef EV_H 30#ifndef EV_H__
2#define EV_H 31#define EV_H__
32
33#ifdef __cplusplus
34extern "C" {
35#endif
3 36
4typedef double ev_tstamp; 37typedef double ev_tstamp;
5 38
39/* these priorities are inclusive, higher priorities will be called earlier */
40#ifndef EV_MINPRI
41# define EV_MINPRI -2
42#endif
43#ifndef EV_MAXPRI
44# define EV_MAXPRI +2
45#endif
46
47#ifndef EV_MULTIPLICITY
48# define EV_MULTIPLICITY 1
49#endif
50
51#ifndef EV_PERIODIC_ENABLE
52# define EV_PERIODIC_ENABLE 1
53#endif
54
55#ifndef EV_STAT_ENABLE
56# define EV_STAT_ENABLE 1
57#endif
58
59#ifndef EV_FORK_ENABLE
60# define EV_FORK_ENABLE 1
61#endif
62
63#ifndef EV_EMBED_ENABLE
64# define EV_EMBED_ENABLE 1
65#endif
66
67/*****************************************************************************/
68
69#include <stddef.h> /* for size_t */
70
71#if EV_STAT_ENABLE
72# include <sys/stat.h>
73#endif
74
75/* support multiple event loops? */
76#if EV_MULTIPLICITY
77struct ev_loop;
78# define EV_P struct ev_loop *loop
79# define EV_P_ EV_P,
80# define EV_A loop
81# define EV_A_ EV_A,
82# define EV_DEFAULT ev_default_loop (0)
83# define EV_DEFAULT_ EV_DEFAULT,
84#else
85# define EV_P void
86# define EV_P_
87# define EV_A
88# define EV_A_
89# define EV_DEFAULT
90# define EV_DEFAULT_
91
92# undef EV_EMBED_ENABLE
93#endif
94
6/* eventmask, revents, events... */ 95/* eventmask, revents, events... */
7#define EV_UNDEF -1 /* guaranteed to be invalid */ 96#define EV_UNDEF -1L /* guaranteed to be invalid */
8#define EV_NONE 0 97#define EV_NONE 0x00L /* no events */
9#define EV_READ 1 98#define EV_READ 0x01L /* ev_io detected read will not block */
10#define EV_WRITE 2 99#define EV_WRITE 0x02L /* ev_io detected write will not block */
11#define EV_TIMEOUT 4 100#define EV_TIMEOUT 0x00000100L /* timer timed out */
12#define EV_SIGNAL 8 101#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
102#define EV_SIGNAL 0x00000400L /* signal was received */
103#define EV_CHILD 0x00000800L /* child/pid had status change */
104#define EV_STAT 0x00001000L /* stat data changed */
105#define EV_IDLE 0x00002000L /* event loop is idling */
106#define EV_PREPARE 0x00004000L /* event loop about to poll */
107#define EV_CHECK 0x00008000L /* event loop finished poll */
108#define EV_EMBED 0x00010000L /* embedded event loop needs sweep */
109#define EV_FORK 0x00020000L /* event loop resumed in child */
110#define EV_ERROR 0x80000000L /* sent when an error occurs */
111
112/* can be used to add custom fields to all watchers, while losing binary compatibility */
113#ifndef EV_COMMON
114# define EV_COMMON void *data;
115#endif
116#ifndef EV_PROTOTYPES
117# define EV_PROTOTYPES 1
118#endif
119
120#define EV_VERSION_MAJOR 1
121#define EV_VERSION_MINOR 1
122
123#ifndef EV_CB_DECLARE
124# define EV_CB_DECLARE(type) void (*cb)(EV_P_ struct type *w, int revents);
125#endif
126#ifndef EV_CB_INVOKE
127# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
128#endif
129
130/*
131 * struct member types:
132 * private: you can look at them, but not change them, and they might not mean anything to you.
133 * ro: can be read anytime, but only changed when the watcher isn't active
134 * rw: can be read and modified anytime, even when the watcher is active
135 */
13 136
14/* shared by all watchers */ 137/* shared by all watchers */
15#define EV_WATCHER(type) \ 138#define EV_WATCHER(type) \
16 int active; /* private */ \ 139 int active; /* private */ \
17 int pending; /* private */ \ 140 int pending; /* private */ \
18 void *data; /* rw */ \ 141 int priority; /* private */ \
19 void (*cb)(struct type *, int revents) /* rw */ 142 EV_COMMON /* rw */ \
143 EV_CB_DECLARE (type) /* private */
20 144
21#define EV_WATCHER_LIST(type) \ 145#define EV_WATCHER_LIST(type) \
22 EV_WATCHER (type); \ 146 EV_WATCHER (type) \
23 struct type *next /* private */ 147 struct ev_watcher_list *next; /* private */
24 148
25struct ev_timer 149#define EV_WATCHER_TIME(type) \
26{ 150 EV_WATCHER (type) \
27 EV_WATCHER_LIST (ev_timer);
28
29 ev_tstamp at; /* private */ 151 ev_tstamp at; /* private */
30 ev_tstamp repeat; /* rw */
31 unsigned char is_abs; /* ro */
32};
33 152
153/* base class, nothing to see here unless you subclass */
154typedef struct ev_watcher
155{
156 EV_WATCHER (ev_watcher)
157} ev_watcher;
158
159/* base class, nothing to see here unless you subclass */
160typedef struct ev_watcher_list
161{
162 EV_WATCHER_LIST (ev_watcher_list)
163} ev_watcher_list;
164
165/* base class, nothing to see here unless you subclass */
166typedef struct ev_watcher_time
167{
168 EV_WATCHER_TIME (ev_watcher_time)
169} ev_watcher_time;
170
171/* invoked when fd is either EV_READable or EV_WRITEable */
172/* revent EV_READ, EV_WRITE */
34struct ev_io 173typedef struct ev_io
35{ 174{
36 EV_WATCHER_LIST (ev_io); 175 EV_WATCHER_LIST (ev_io)
37 176
38 int fd; /* ro */ 177 int fd; /* ro */
39 int events; /* ro */ 178 int events; /* ro */
179} ev_io;
180
181/* invoked after a specific time, repeatable (based on monotonic clock) */
182/* revent EV_TIMEOUT */
183typedef struct ev_timer
184{
185 EV_WATCHER_TIME (ev_timer)
186
187 ev_tstamp repeat; /* rw */
188} ev_timer;
189
190/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
191/* revent EV_PERIODIC */
192typedef struct ev_periodic
193{
194 EV_WATCHER_TIME (ev_periodic)
195
196 ev_tstamp interval; /* rw */
197 ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* rw */
198} ev_periodic;
199
200/* invoked when the given signal has been received */
201/* revent EV_SIGNAL */
202typedef struct ev_signal
203{
204 EV_WATCHER_LIST (ev_signal)
205
206 int signum; /* ro */
207} ev_signal;
208
209/* invoked when sigchld is received and waitpid indicates the given pid */
210/* revent EV_CHILD */
211/* does not support priorities */
212typedef struct ev_child
213{
214 EV_WATCHER_LIST (ev_child)
215
216 int pid; /* ro */
217 int rpid; /* rw, holds the received pid */
218 int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
219} ev_child;
220
221#if EV_STAT_ENABLE
222/* st_nlink = 0 means missing file or other error */
223#ifdef _WIN32
224typedef struct _stati64 ev_statdata;
225#else
226typedef struct stat ev_statdata;
227#endif
228
229/* invoked each time the stat data changes for a given path */
230/* revent EV_STAT */
231typedef struct ev_stat
232{
233 EV_WATCHER (ev_stat)
234
235 ev_timer timer; /* private */
236 ev_tstamp interval; /* ro */
237 const char *path; /* ro */
238 ev_statdata prev; /* ro */
239 ev_statdata attr; /* ro */
240} ev_stat;
241#endif
242
243/* invoked when the nothing else needs to be done, keeps the process from blocking */
244/* revent EV_IDLE */
245typedef struct ev_idle
246{
247 EV_WATCHER (ev_idle)
248} ev_idle;
249
250/* invoked for each run of the mainloop, just before the blocking call */
251/* you can still change events in any way you like */
252/* revent EV_PREPARE */
253typedef struct ev_prepare
254{
255 EV_WATCHER (ev_prepare)
256} ev_prepare;
257
258/* invoked for each run of the mainloop, just after the blocking call */
259/* revent EV_CHECK */
260typedef struct ev_check
261{
262 EV_WATCHER (ev_check)
263} ev_check;
264
265#if EV_FORK_ENABLE
266/* the callback gets invoked before check in the child process when a fork was detected */
267typedef struct ev_fork
268{
269 EV_WATCHER (ev_fork)
270} ev_fork;
271#endif
272
273#if EV_EMBED_ENABLE
274/* used to embed an event loop inside another */
275/* the callback gets invoked when the event loop has handled events, and can be 0 */
276typedef struct ev_embed
277{
278 EV_WATCHER (ev_embed)
279
280 ev_io io; /* private */
281 struct ev_loop *loop; /* ro */
282} ev_embed;
283#endif
284
285/* the presence of this union forces similar struct layout */
286union ev_any_watcher
287{
288 struct ev_watcher w;
289 struct ev_watcher_list wl;
290
291 struct ev_io io;
292 struct ev_timer timer;
293 struct ev_periodic periodic;
294 struct ev_signal signal;
295 struct ev_child child;
296#if EV_STAT_ENABLE
297 struct ev_stat stat;
298#endif
299 struct ev_idle idle;
300 struct ev_prepare prepare;
301 struct ev_check check;
302#if EV_FORK_ENABLE
303 struct ev_fork fork;
304#endif
305#if EV_EMBED_ENABLE
306 struct ev_embed embed;
307#endif
40}; 308};
41 309
42struct ev_signal 310/* bits for ev_default_loop and ev_loop_new */
43{ 311/* the default */
44 EV_WATCHER_LIST (ev_signal); 312#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
313/* flag bits */
314#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */
315/* method bits to be ored together */
316#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */
317#define EVBACKEND_POLL 0x00000002UL /* !win */
318#define EVBACKEND_EPOLL 0x00000004UL /* linux */
319#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */
320#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 */ /* NYI */
321#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */
45 322
46 int signum; /* ro */ 323#if EV_PROTOTYPES
47}; 324int ev_version_major (void);
325int ev_version_minor (void);
48 326
49#define EVMETHOD_NONE 0 327unsigned int ev_supported_backends (void);
50#define EVMETHOD_SELECT 1 328unsigned int ev_recommended_backends (void);
51#define EVMETHOD_EPOLL 2 329unsigned int ev_embeddable_backends (void);
52int ev_init (int flags);
53extern int ev_method;
54 330
55void ev_prefork (void);
56void ev_postfork_parent (void);
57void ev_postfork_child (void);
58
59extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */
60ev_tstamp ev_time (void); 331ev_tstamp ev_time (void);
332
333/* Sets the allocation function to use, works like realloc.
334 * It is used to allocate and free memory.
335 * If it returns zero when memory needs to be allocated, the library might abort
336 * or take some potentially destructive action.
337 * The default is your system realloc function.
338 */
339void ev_set_allocator (void *(*cb)(void *ptr, size_t size));
340
341/* set the callback function to call on a
342 * retryable syscall error
343 * (such as failed select, poll, epoll_wait)
344 */
345void ev_set_syserr_cb (void (*cb)(const char *msg));
346
347# if EV_MULTIPLICITY
348/* the default loop is the only one that handles signals and child watchers */
349/* you can call this as often as you like */
350static struct ev_loop *
351ev_default_loop (unsigned int flags)
352{
353 extern struct ev_loop *ev_default_loop_ptr;
354 extern struct ev_loop *ev_default_loop_init (unsigned int flags);
355
356 if (!ev_default_loop_ptr)
357 ev_default_loop_init (flags);
358
359 return ev_default_loop_ptr;
360}
361
362/* create and destroy alternative loops that don't handle signals */
363struct ev_loop *ev_loop_new (unsigned int flags);
364void ev_loop_destroy (EV_P);
365void ev_loop_fork (EV_P);
366
367ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
368
369# else
370
371int ev_default_loop (unsigned int flags); /* returns true when successful */
372
373static ev_tstamp
374ev_now (void)
375{
376 extern ev_tstamp ev_rt_now;
377
378 return ev_rt_now;
379}
380# endif
381
382void ev_default_destroy (void); /* destroy the default loop */
383/* this needs to be called after fork, to duplicate the default loop */
384/* if you create alternative loops you have to call ev_loop_fork on them */
385/* you can call it in either the parent or the child */
386/* you can actually call it at any time, anywhere :) */
387void ev_default_fork (void);
388
389unsigned int ev_backend (EV_P);
390#endif
61 391
62#define EVLOOP_NONBLOCK 1 /* do not block/wait */ 392#define EVLOOP_NONBLOCK 1 /* do not block/wait */
63#define EVLOOP_ONESHOT 2 /* block *once* only */ 393#define EVLOOP_ONESHOT 2 /* block *once* only */
394#define EVUNLOOP_CANCEL 0 /* undo unloop */
395#define EVUNLOOP_ONE 1 /* unloop once */
396#define EVUNLOOP_ALL 2 /* unloop all loops */
397
398#if EV_PROTOTYPES
64void ev_loop (int flags); 399void ev_loop (EV_P_ int flags);
65extern int ev_loop_done; /* set to 1 to break out of event loop */ 400void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
401
402/*
403 * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
404 * keeps one reference. if you have a long-runing watcher you never unregister that
405 * should not keep ev_loop from running, unref() after starting, and ref() before stopping.
406 */
407void ev_ref (EV_P);
408void ev_unref (EV_P);
409
410/* convinience function, wait for a single event, without registering an event watcher */
411/* if timeout is < 0, do wait indefinitely */
412void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
413#endif
66 414
67/* these may evaluate ev multiple times, and the other arguments at most once */ 415/* these may evaluate ev multiple times, and the other arguments at most once */
68#define evw_init(ev,cb_,data_) do { (ev)->active = 0; (ev)->cb = (cb_); (ev)->data = (void *)data_; } while (0) 416/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
417#define ev_init(ev,cb_) do { \
418 ((ev_watcher *)(void *)(ev))->active = \
419 ((ev_watcher *)(void *)(ev))->pending = \
420 ((ev_watcher *)(void *)(ev))->priority = 0; \
421 ev_set_cb ((ev), cb_); \
422} while (0)
69 423
70#define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) 424#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
71#define evtimer_set_rel(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); (ev)->is_abs = 0; } while (0) 425#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
72#define evtimer_set_abs(ev,at_,repeat_) do { (ev)->at = (at_); (ev)->repeat = (repeat_); (ev)->is_abs = 1; } while (0) 426#define ev_periodic_set(ev,at_,ival_,res_) do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
73#define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) 427#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
428#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
429#define ev_stat_set(ev,path_,interval_) do { (ev)->path = (path_); (ev)->interval = (interval_); } while (0)
430#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
431#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
432#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
433#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0)
434#define ev_fork_set(ev) /* nop, yes, this is a serious in-joke */
74 435
436#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
437#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
438#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
439#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
440#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
441#define ev_stat_init(ev,cb,path,interval) do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
442#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
443#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
444#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
445#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
446#define ev_fork_init(ev,cb) do { ev_init ((ev), (cb)); ev_fork_set ((ev)); } while (0)
447
448#define ev_is_pending(ev) (0 + ((ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
75#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ 449#define ev_is_active(ev) (0 + ((ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */
76 450
451#define ev_priority(ev) ((ev_watcher *)(void *)(ev))->priority /* rw */
452#define ev_cb(ev) (ev)->cb /* rw */
453#define ev_set_priority(ev,pri) ev_priority (ev) = (pri)
454
455#ifndef ev_set_cb
456# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
457#endif
458
459/* stopping (enabling, adding) a watcher does nothing if it is already running */
460/* stopping (disabling, deleting) a watcher does nothing unless its already running */
461#if EV_PROTOTYPES
462
463/* feeds an event into a watcher as if the event actually occured */
464/* accepts any ev_watcher type */
465void ev_feed_event (EV_P_ void *w, int revents);
466void ev_feed_fd_event (EV_P_ int fd, int revents);
467void ev_feed_signal_event (EV_P_ int signum);
468
77void evio_start (struct ev_io *w); 469void ev_io_start (EV_P_ ev_io *w);
78void evio_stop (struct ev_io *w); 470void ev_io_stop (EV_P_ ev_io *w);
79 471
80void evtimer_start (struct ev_timer *w); 472void ev_timer_start (EV_P_ ev_timer *w);
81void evtimer_stop (struct ev_timer *w); 473void ev_timer_stop (EV_P_ ev_timer *w);
474/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
475void ev_timer_again (EV_P_ ev_timer *w);
82 476
477#if EV_PERIODIC_ENABLE
478void ev_periodic_start (EV_P_ ev_periodic *w);
479void ev_periodic_stop (EV_P_ ev_periodic *w);
480void ev_periodic_again (EV_P_ ev_periodic *w);
481#endif
482
483/* only supported in the default loop */
83void evsignal_start (struct ev_signal *w); 484void ev_signal_start (EV_P_ ev_signal *w);
84void evsignal_stop (struct ev_signal *w); 485void ev_signal_stop (EV_P_ ev_signal *w);
85 486
487/* only supported in the default loop */
488void ev_child_start (EV_P_ ev_child *w);
489void ev_child_stop (EV_P_ ev_child *w);
490
491# if EV_STAT_ENABLE
492void ev_stat_start (EV_P_ ev_stat *w);
493void ev_stat_stop (EV_P_ ev_stat *w);
494void ev_stat_stat (EV_P_ ev_stat *w);
86#endif 495# endif
87 496
497void ev_idle_start (EV_P_ ev_idle *w);
498void ev_idle_stop (EV_P_ ev_idle *w);
499
500void ev_prepare_start (EV_P_ ev_prepare *w);
501void ev_prepare_stop (EV_P_ ev_prepare *w);
502
503void ev_check_start (EV_P_ ev_check *w);
504void ev_check_stop (EV_P_ ev_check *w);
505
506# if EV_FORK_ENABLE
507void ev_fork_start (EV_P_ ev_fork *w);
508void ev_fork_stop (EV_P_ ev_fork *w);
509# endif
510
511# if EV_EMBED_ENABLE
512/* only supported when loop to be embedded is in fact embeddable */
513void ev_embed_start (EV_P_ ev_embed *w);
514void ev_embed_stop (EV_P_ ev_embed *w);
515void ev_embed_sweep (EV_P_ ev_embed *w);
516# endif
517
518#endif
519
520#ifdef __cplusplus
521}
522#endif
523
524#endif
525

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