ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libev/ev.h
(Generate patch)

Comparing libev/ev.h (file contents):
Revision 1.3 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.28 by root, Sat Nov 3 22:10:39 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
3 32
33#ifdef __cplusplus
34extern "C" {
35#endif
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/* support multiple event loops? */
48#ifdef EV_MULTIPLICITY
49struct ev_loop;
50# define EV_P struct ev_loop *loop
51# define EV_P_ EV_P,
52# define EV_A loop
53# define EV_A_ EV_A,
54#else
55# define EV_P void
56# define EV_P_
57# define EV_A
58# define EV_A_
59
60#endif
61
6/* eventmask, revents, events... */ 62/* eventmask, revents, events... */
7#define EV_UNDEF -1 /* guaranteed to be invalid */ 63#define EV_UNDEF -1 /* guaranteed to be invalid */
8#define EV_NONE 0 64#define EV_NONE 0x00
9#define EV_READ 1 65#define EV_READ 0x01
10#define EV_WRITE 2 66#define EV_WRITE 0x02
11#define EV_TIMEOUT 4 67#define EV_TIMEOUT 0x000100
68#define EV_PERIODIC 0x000200
12#define EV_SIGNAL 8 69#define EV_SIGNAL 0x000400
70#define EV_IDLE 0x000800
71#define EV_CHECK 0x001000
72#define EV_PREPARE 0x002000
73#define EV_CHILD 0x004000
74#define EV_ERROR 0x800000 /* sent when an error occurs */
75
76/* can be used to add custom fields to all watchers */
77#ifndef EV_COMMON
78# define EV_COMMON void *data
79#endif
80#ifndef EV_PROTOTYPES
81# define EV_PROTOTYPES 1
82#endif
83
84#define EV_VERSION_MAJOR 1
85#define EV_VERSION_MINOR 1
86
87/*
88 * struct member types:
89 * private: you can look at them, but not change them, and they might not mean anything to you.
90 * ro: can be read anytime, but only changed when the watcher isn't active
91 * rw: can be read and modified anytime, even when the watcher is active
92 */
13 93
14/* shared by all watchers */ 94/* shared by all watchers */
15#define EV_WATCHER(type) \ 95#define EV_WATCHER(type) \
16 int active; /* private */ \ 96 int active; /* private */ \
17 int pending; /* private */ \ 97 int pending; /* private */ \
18 void *data; /* rw */ \ 98 int priority; /* ro */ \
19 void (*cb)(struct type *, int revents) /* rw */ 99 EV_COMMON; /* rw */ \
100 void (*cb)(EV_P_ struct type *, int revents); /* rw */ /* gets invoked with an eventmask */
20 101
21#define EV_WATCHER_LIST(type) \ 102#define EV_WATCHER_LIST(type) \
22 EV_WATCHER (type); \ 103 EV_WATCHER (type); \
23 struct type *next /* private */ 104 struct ev_watcher_list *next /* private */
24 105
106#define EV_WATCHER_TIME(type) \
107 EV_WATCHER (type); \
108 ev_tstamp at /* private */
109
110/* base class, nothing to see here unless you subclass */
111struct ev_watcher {
112 EV_WATCHER (ev_watcher);
113};
114
115/* base class, nothing to see here unless you subclass */
116struct ev_watcher_list {
117 EV_WATCHER_LIST (ev_watcher_list);
118};
119
120/* base class, nothing to see here unless you subclass */
121struct ev_watcher_time {
122 EV_WATCHER_TIME (ev_watcher_time);
123};
124
125/* invoked after a specific time, repeatable (based on monotonic clock) */
126/* revent EV_TIMEOUT */
25struct ev_timer 127struct ev_timer
26{ 128{
27 EV_WATCHER_LIST (ev_timer); 129 EV_WATCHER_TIME (ev_timer);
28 130
29 ev_tstamp at; /* private */
30 ev_tstamp repeat; /* rw */ 131 ev_tstamp repeat; /* rw */
31 unsigned char is_abs; /* ro */
32}; 132};
33 133
134/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
135/* revent EV_PERIODIC */
136struct ev_periodic
137{
138 EV_WATCHER_TIME (ev_periodic);
139
140 ev_tstamp interval; /* rw */
141};
142
143/* invoked when fd is either EV_READable or EV_WRITEable */
144/* revent EV_READ, EV_WRITE */
34struct ev_io 145struct ev_io
35{ 146{
36 EV_WATCHER_LIST (ev_io); 147 EV_WATCHER_LIST (ev_io);
37 148
38 int fd; /* ro */ 149 int fd; /* ro */
39 int events; /* ro */ 150 int events; /* ro */
40}; 151};
41 152
153/* invoked when the given signal has been received */
154/* revent EV_SIGNAL */
42struct ev_signal 155struct ev_signal
43{ 156{
44 EV_WATCHER_LIST (ev_signal); 157 EV_WATCHER_LIST (ev_signal);
45 158
46 int signum; /* ro */ 159 int signum; /* ro */
47}; 160};
48 161
49#define EVMETHOD_NONE 0 162/* invoked when the nothing else needs to be done, keeps the process from blocking */
163/* revent EV_IDLE */
164struct ev_idle
165{
166 EV_WATCHER (ev_idle);
167};
168
169/* invoked for each run of the mainloop, just before the blocking call */
170/* you can still change events in any way you like */
171/* revent EV_PREPARE */
172struct ev_prepare
173{
174 EV_WATCHER (ev_prepare);
175};
176
177/* invoked for each run of the mainloop, just after the blocking call */
178/* revent EV_CHECK */
179struct ev_check
180{
181 EV_WATCHER (ev_check);
182};
183
184/* invoked when sigchld is received and waitpid indicates the givne pid */
185/* revent EV_CHILD */
186/* does not support priorities */
187struct ev_child
188{
189 EV_WATCHER_LIST (ev_child);
190
191 int pid; /* ro */
192 int rpid; /* rw, holds the received pid */
193 int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
194};
195
196#define EVMETHOD_AUTO 0 /* consults environment */
50#define EVMETHOD_SELECT 1 197#define EVMETHOD_SELECT 1
51#define EVMETHOD_EPOLL 2 198#define EVMETHOD_POLL 2
52int ev_init (int flags); 199#define EVMETHOD_EPOLL 4
53extern int ev_method; 200#define EVMETHOD_KQUEUE 8
201#define EVMETHOD_DEVPOLL 16 /* NYI */
202#define EVMETHOD_PORT 32 /* NYI */
203#define EVMETHOD_ANY ~0 /* any method, do not consult env */
204#if EV_PROTOTYPES
205int ev_method (EV_P);
206int ev_init (EV_P_ int methods); /* returns ev_method */
207int ev_version_major (void);
208int ev_version_minor (void);
54 209
210/* these three calls are suitable for plugging into pthread_atfork */
55void ev_prefork (void); 211void ev_fork_prepare (void);
56void ev_postfork_parent (void); 212void ev_fork_parent (void);
57void ev_postfork_child (void); 213void ev_fork_child (void);
58 214
59extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */
60ev_tstamp ev_time (void); 215ev_tstamp ev_time (void);
216#endif
61 217
62#define EVLOOP_NONBLOCK 1 /* do not block/wait */ 218#define EVLOOP_NONBLOCK 1 /* do not block/wait */
63#define EVLOOP_ONESHOT 2 /* block *once* only */ 219#define EVLOOP_ONESHOT 2 /* block *once* only */
220#if EV_PROTOTYPES
64void ev_loop (int flags); 221void ev_loop (EV_P_ int flags);
65extern int ev_loop_done; /* set to 1 to break out of event loop */ 222void ev_unloop (EV_P_ int status); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
223
224ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
225
226/*
227 * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
228 * keeps one reference. if you have a long-runing watcher you never unregister that
229 * should not keep ev_loop from running, unref() after starting, and ref() before stopping.
230 */
231void ev_ref (EV_P);
232void ev_unref (EV_P);
233
234/* convinience function, wait for a single event, without registering an event watcher */
235/* if timeout is < 0, do wait indefinitely */
236void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
237#endif
66 238
67/* these may evaluate ev multiple times, and the other arguments at most once */ 239/* 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) 240/* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
241#define ev_watcher_init(ev,cb_) do { (ev)->active = (ev)->pending = (ev)->priority = 0; (ev)->cb = (cb_); } while (0)
69 242
70#define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) 243#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) 244#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) 245#define ev_periodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0)
73#define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) 246#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
247#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
248#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
249#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
250#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
74 251
252#define ev_io_init(ev,cb,fd,events) do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
253#define ev_timer_init(ev,cb,after,repeat) do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
254#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0)
255#define ev_signal_init(ev,cb,signum) do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
256#define ev_idle_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
257#define ev_prepare_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
258#define ev_check_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
259#define ev_child_init(ev,cb,pid) do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
260
75#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ 261#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */
262#define ev_set_priority(ev,pri) (ev)->priority = pri
76 263
264/* stopping (enabling, adding) a watcher does nothing if it is already running */
265/* stopping (disabling, deleting) a watcher does nothing unless its already running */
266#if EV_PROTOTYPES
77void evio_start (struct ev_io *w); 267void ev_io_start (EV_P_ struct ev_io *w);
78void evio_stop (struct ev_io *w); 268void ev_io_stop (EV_P_ struct ev_io *w);
79 269
80void evtimer_start (struct ev_timer *w); 270void ev_timer_start (EV_P_ struct ev_timer *w);
81void evtimer_stop (struct ev_timer *w); 271void ev_timer_stop (EV_P_ struct ev_timer *w);
272void ev_timer_again (EV_P_ struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
82 273
274void ev_periodic_start (EV_P_ struct ev_periodic *w);
275void ev_periodic_stop (EV_P_ struct ev_periodic *w);
276
83void evsignal_start (struct ev_signal *w); 277void ev_signal_start (EV_P_ struct ev_signal *w);
84void evsignal_stop (struct ev_signal *w); 278void ev_signal_stop (EV_P_ struct ev_signal *w);
85 279
86#endif 280void ev_idle_start (EV_P_ struct ev_idle *w);
281void ev_idle_stop (EV_P_ struct ev_idle *w);
87 282
283void ev_prepare_start (EV_P_ struct ev_prepare *w);
284void ev_prepare_stop (EV_P_ struct ev_prepare *w);
285
286void ev_check_start (EV_P_ struct ev_check *w);
287void ev_check_stop (EV_P_ struct ev_check *w);
288
289void ev_child_start (EV_P_ struct ev_child *w);
290void ev_child_stop (EV_P_ struct ev_child *w);
291#endif
292
293#ifdef __cplusplus
294}
295#endif
296
297#endif
298

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines