libev/ev.h

/*
 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef EV_H
#define EV_H

#ifdef __cplusplus
extern "C" {
#endif

typedef double ev_tstamp;

/* eventmask, revents, events... */
#define EV_UNDEF          -1 /* guaranteed to be invalid */
#define EV_NONE         0x00
#define EV_READ         0x01
#define EV_WRITE        0x02
#define EV_TIMEOUT  0x000100
#define EV_PERIODIC 0x000200
#define EV_SIGNAL   0x000400
#define EV_IDLE     0x000800
#define EV_CHECK    0x001000
#define EV_PREPARE  0x002000
#define EV_CHILD    0x004000
#define EV_ERROR    0x800000 /* sent when an error occurs */

/* can be used to add custom fields to all watchers */
#ifndef EV_COMMON
# define EV_COMMON void *data
#endif
#ifndef EV_PROTOTYPES
# define EV_PROTOTYPES 1
#endif

#define EV_VERSION_MAJOR 1
#define EV_VERSION_MINOR 1

/*
 * struct member types:
 * private: you can look at them, but not change them, and they might not mean anything to you.
 * ro: can be read anytime, but only changed when the watcher isn't active
 * rw: can be read and modified anytime, even when the watcher is active
 */

/* shared by all watchers */
#define EV_WATCHER(type)                        \
  int active; /* private */                     \
  int pending; /* private */                    \
  EV_COMMON; /* rw */                           \
  void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */

#define EV_WATCHER_LIST(type)                   \
  EV_WATCHER (type);                            \
  struct type *next /* private */

#define EV_WATCHER_TIME(type)                   \
  EV_WATCHER (type);                            \
  ev_tstamp at     /* private */

/* base class, nothing to see here unless you subclass */
struct ev_watcher {
  EV_WATCHER (ev_watcher);
};

/* base class, nothing to see here unless you subclass */
struct ev_watcher_list {
  EV_WATCHER_LIST (ev_watcher_list);
};

/* base class, nothing to see here unless you subclass */
struct ev_watcher_time {
  EV_WATCHER_TIME (ev_watcher_time);
};

/* invoked after a specific time, repeatable (based on monotonic clock) */
/* revent EV_TIMEOUT */
struct ev_timer
{
  EV_WATCHER_TIME (ev_timer);

  ev_tstamp repeat; /* rw */
};

/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
/* revent EV_PERIODIC */
struct ev_periodic
{
  EV_WATCHER_TIME (ev_periodic);

  ev_tstamp interval; /* rw */
};

/* invoked when fd is either EV_READable or EV_WRITEable */
/* revent EV_READ, EV_WRITE */
struct ev_io
{
  EV_WATCHER_LIST (ev_io);

  int fd;     /* ro */
  int events; /* ro */
};

/* invoked when the given signal has been received */
/* revent EV_SIGNAL */
struct ev_signal
{
  EV_WATCHER_LIST (ev_signal);

  int signum; /* ro */
};

/* invoked when the nothing else needs to be done, keeps the process from blocking */
/* revent EV_IDLE */
struct ev_idle
{
  EV_WATCHER (ev_idle);
};

/* invoked for each run of the mainloop, just before the blocking call */
/* you can still change events in any way you like */
/* revent EV_PREPARE */
struct ev_prepare
{
  EV_WATCHER (ev_prepare);
};

/* invoked for each run of the mainloop, just after the blocking call */
/* revent EV_CHECK */
struct ev_check
{
  EV_WATCHER (ev_check);
};

/* invoked when sigchld is received and waitpid indicates the givne pid */
/* revent EV_CHILD */
struct ev_child
{
  EV_WATCHER_LIST (ev_child);

  int pid;    /* ro */
  int status; /* rw, holds the exit status, use the macros from sys/wait.h */
};

#define EVMETHOD_AUTO   0 /* consults environment */
#define EVMETHOD_SELECT 1
#define EVMETHOD_POLL   2
#define EVMETHOD_EPOLL  4
#define EVMETHOD_ANY    ~0 /* any method, do not consult env */
#if EV_PROTOTYPES
extern int ev_method;
int ev_init (int methods); /* returns ev_method */
int ev_version_major (void);
int ev_version_minor (void);

/* these three calls are suitable for plugging into pthread_atfork */
void ev_fork_prepare (void);
void ev_fork_parent (void);
void ev_fork_child (void);

extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */
ev_tstamp ev_time (void);
#endif

#define EVLOOP_NONBLOCK 1 /* do not block/wait */
#define EVLOOP_ONESHOT  2 /* block *once* only */
#if EV_PROTOTYPES
void ev_loop (int flags);
extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */

/* convinience function, wait for a single event, without registering an event watcher */
/* if timeout is < 0, do wait indefinitely */
void ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
#endif

/* these may evaluate ev multiple times, and the other arguments at most once */
/* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
#define ev_watcher_init(ev,cb_)             do { (ev)->active = 0; (ev)->pending = 0; (ev)->cb = (cb_); } while (0)

#define ev_io_set(ev,fd_,events_)           do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
#define ev_timer_set(ev,after_,repeat_)     do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
#define ev_periodic_set(ev,at_,interval_)   do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0)
#define ev_signal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
#define ev_idle_set(ev)                     /* nop, yes, this is a serious in-joke */
#define ev_prepare_set(ev)                  /* nop, yes, this is a serious in-joke */
#define ev_check_set(ev)                    /* nop, yes, this is a serious in-joke */
#define ev_child_set(ev,pid_)               do { (ev)->pid = (pid_); } while (0)

#define ev_io_init(ev,cb,fd,events)         do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
#define ev_timer_init(ev,cb,after,repeat)   do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0)
#define ev_signal_init(ev,cb,signum)        do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
#define ev_idle_init(ev,cb)                 do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
#define ev_prepare_init(ev,cb)              do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
#define ev_check_init(ev,cb)                do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
#define ev_child_init(ev,cb,pid)            do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)

#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */

/* stopping (enabling, adding) a watcher does nothing if it is already running */
/* stopping (disabling, deleting) a watcher does nothing unless its already running */
#if EV_PROTOTYPES
void ev_io_start       (struct ev_io *w);
void ev_io_stop        (struct ev_io *w);

void ev_timer_start    (struct ev_timer *w);
void ev_timer_stop     (struct ev_timer *w);
void ev_timer_again    (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */

void ev_periodic_start (struct ev_periodic *w);
void ev_periodic_stop  (struct ev_periodic *w);

void ev_signal_start   (struct ev_signal *w);
void ev_signal_stop    (struct ev_signal *w);

void ev_idle_start     (struct ev_idle *w);
void ev_idle_stop      (struct ev_idle *w);

void ev_prepare_start  (struct ev_prepare *w);
void ev_prepare_stop   (struct ev_prepare *w);

void ev_check_start    (struct ev_check *w);
void ev_check_stop     (struct ev_check *w);

void ev_child_start    (struct ev_child *w);
void ev_child_stop     (struct ev_child *w);
#endif

#ifdef __cplusplus
}
#endif

#endif

Revision:	1.20
Committed:	Fri Nov 2 16:54:35 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.19:	+5 -3 lines
Log Message:	implement poll method, handle enomem by closing a 'random' fd
#	User	Rev	Content
1	root	1.10	/*
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
30	root	1.1	#ifndef EV_H
31			#define EV_H
32
33	root	1.19	#ifdef __cplusplus
34			extern "C" {
35			#endif
36
37	root	1.1	typedef double ev_tstamp;
38
39			/* eventmask, revents, events... */
40	root	1.17	#define EV_UNDEF -1 /* guaranteed to be invalid */
41			#define EV_NONE 0x00
42			#define EV_READ 0x01
43			#define EV_WRITE 0x02
44			#define EV_TIMEOUT 0x000100
45			#define EV_PERIODIC 0x000200
46			#define EV_SIGNAL 0x000400
47			#define EV_IDLE 0x000800
48			#define EV_CHECK 0x001000
49			#define EV_PREPARE 0x002000
50			#define EV_CHILD 0x004000
51			#define EV_ERROR 0x800000 /* sent when an error occurs */
52	root	1.1
53	root	1.6	/* can be used to add custom fields to all watchers */
54			#ifndef EV_COMMON
55			# define EV_COMMON void *data
56			#endif
57	root	1.9	#ifndef EV_PROTOTYPES
58			# define EV_PROTOTYPES 1
59			#endif
60	root	1.6
61	root	1.14	#define EV_VERSION_MAJOR 1
62			#define EV_VERSION_MINOR 1
63
64	root	1.6	/*
65			* struct member types:
66			* private: you can look at them, but not change them, and they might not mean anything to you.
67			* ro: can be read anytime, but only changed when the watcher isn't active
68			* rw: can be read and modified anytime, even when the watcher is active
69			*/
70
71	root	1.1	/* shared by all watchers */
72			#define EV_WATCHER(type) \
73			int active; /* private */ \
74			int pending; /* private */ \
75	root	1.6	EV_COMMON; /* rw */ \
76			void (cb)(struct type , int revents); /* rw / / gets invoked with an eventmask */
77	root	1.1
78			#define EV_WATCHER_LIST(type) \
79			EV_WATCHER (type); \
80			struct type next / private */
81
82	root	1.6	#define EV_WATCHER_TIME(type) \
83			EV_WATCHER (type); \
84			ev_tstamp at /* private */
85
86	root	1.7	/* base class, nothing to see here unless you subclass */
87			struct ev_watcher {
88			EV_WATCHER (ev_watcher);
89			};
90
91			/* base class, nothing to see here unless you subclass */
92			struct ev_watcher_list {
93			EV_WATCHER_LIST (ev_watcher_list);
94			};
95
96			/* base class, nothing to see here unless you subclass */
97			struct ev_watcher_time {
98			EV_WATCHER_TIME (ev_watcher_time);
99			};
100
101	root	1.6	/* invoked after a specific time, repeatable (based on monotonic clock) */
102	root	1.17	/* revent EV_TIMEOUT */
103	root	1.1	struct ev_timer
104			{
105	root	1.6	EV_WATCHER_TIME (ev_timer);
106	root	1.1
107			ev_tstamp repeat; /* rw */
108	root	1.6	};
109
110			/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
111	root	1.17	/* revent EV_PERIODIC */
112	root	1.6	struct ev_periodic
113			{
114			EV_WATCHER_TIME (ev_periodic);
115
116			ev_tstamp interval; /* rw */
117	root	1.1	};
118
119	root	1.5	/* invoked when fd is either EV_READable or EV_WRITEable */
120	root	1.17	/* revent EV_READ, EV_WRITE */
121	root	1.1	struct ev_io
122			{
123			EV_WATCHER_LIST (ev_io);
124
125			int fd; /* ro */
126			int events; /* ro */
127			};
128
129	root	1.5	/* invoked when the given signal has been received */
130	root	1.17	/* revent EV_SIGNAL */
131	root	1.1	struct ev_signal
132			{
133			EV_WATCHER_LIST (ev_signal);
134
135			int signum; /* ro */
136			};
137
138	root	1.5	/* invoked when the nothing else needs to be done, keeps the process from blocking */
139	root	1.17	/* revent EV_IDLE */
140	root	1.5	struct ev_idle
141			{
142			EV_WATCHER (ev_idle);
143			};
144
145	root	1.11	/* invoked for each run of the mainloop, just before the blocking call */
146			/* you can still change events in any way you like */
147	root	1.17	/* revent EV_PREPARE */
148	root	1.11	struct ev_prepare
149			{
150			EV_WATCHER (ev_prepare);
151			};
152
153			/* invoked for each run of the mainloop, just after the blocking call */
154	root	1.17	/* revent EV_CHECK */
155	root	1.5	struct ev_check
156			{
157			EV_WATCHER (ev_check);
158			};
159
160	root	1.12	/* invoked when sigchld is received and waitpid indicates the givne pid */
161	root	1.17	/* revent EV_CHILD */
162	root	1.12	struct ev_child
163			{
164			EV_WATCHER_LIST (ev_child);
165
166			int pid; /* ro */
167	root	1.13	int status; /* rw, holds the exit status, use the macros from sys/wait.h */
168	root	1.12	};
169
170	root	1.20	#define EVMETHOD_AUTO 0 /* consults environment */
171	root	1.1	#define EVMETHOD_SELECT 1
172	root	1.20	#define EVMETHOD_POLL 2
173			#define EVMETHOD_EPOLL 4
174			#define EVMETHOD_ANY ~0 /* any method, do not consult env */
175	root	1.9	#if EV_PROTOTYPES
176			extern int ev_method;
177	root	1.20	int ev_init (int methods); /* returns ev_method */
178	root	1.14	int ev_version_major (void);
179			int ev_version_minor (void);
180	root	1.1
181	root	1.5	/* these three calls are suitable for plugging into pthread_atfork */
182	root	1.18	void ev_fork_prepare (void);
183			void ev_fork_parent (void);
184			void ev_fork_child (void);
185	root	1.1
186			extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */
187			ev_tstamp ev_time (void);
188	root	1.9	#endif
189	root	1.1
190			#define EVLOOP_NONBLOCK 1 /* do not block/wait */
191			#define EVLOOP_ONESHOT 2 /* block once only */
192	root	1.9	#if EV_PROTOTYPES
193	root	1.3	void ev_loop (int flags);
194	root	1.7	extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
195	root	1.1
196	root	1.9	/* convinience function, wait for a single event, without registering an event watcher */
197			/* if timeout is < 0, do wait indefinitely */
198			void ev_once (int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg);
199			#endif
200
201	root	1.2	/* these may evaluate ev multiple times, and the other arguments at most once */
202	root	1.16	/* either use ev_watcher_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
203			#define ev_watcher_init(ev,cb_) do { (ev)->active = 0; (ev)->pending = 0; (ev)->cb = (cb_); } while (0)
204	root	1.3
205	root	1.16	#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
206			#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
207			#define ev_periodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0)
208			#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
209			#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
210			#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
211			#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
212			#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
213
214			#define ev_io_init(ev,cb,fd,events) do { ev_watcher_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
215			#define ev_timer_init(ev,cb,after,repeat) do { ev_watcher_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
216			#define ev_periodic_init(ev,cb,at,interval) do { ev_watcher_init ((ev), (cb)); ev_periodic_set ((ev),(at),(interval)); } while (0)
217			#define ev_signal_init(ev,cb,signum) do { ev_watcher_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
218			#define ev_idle_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
219			#define ev_prepare_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
220			#define ev_check_init(ev,cb) do { ev_watcher_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
221			#define ev_child_init(ev,cb,pid) do { ev_watcher_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
222	root	1.1
223	root	1.2	#define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */
224	root	1.1
225	root	1.5	/* stopping (enabling, adding) a watcher does nothing if it is already running */
226			/* stopping (disabling, deleting) a watcher does nothing unless its already running */
227	root	1.9	#if EV_PROTOTYPES
228	root	1.16	void ev_io_start (struct ev_io *w);
229			void ev_io_stop (struct ev_io *w);
230	root	1.6
231	root	1.16	void ev_timer_start (struct ev_timer *w);
232			void ev_timer_stop (struct ev_timer *w);
233			void ev_timer_again (struct ev_timer w); / stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
234	root	1.1
235	root	1.16	void ev_periodic_start (struct ev_periodic *w);
236			void ev_periodic_stop (struct ev_periodic *w);
237	root	1.1
238	root	1.16	void ev_signal_start (struct ev_signal *w);
239			void ev_signal_stop (struct ev_signal *w);
240	root	1.1
241	root	1.16	void ev_idle_start (struct ev_idle *w);
242			void ev_idle_stop (struct ev_idle *w);
243	root	1.5
244	root	1.16	void ev_prepare_start (struct ev_prepare *w);
245			void ev_prepare_stop (struct ev_prepare *w);
246	root	1.11
247	root	1.16	void ev_check_start (struct ev_check *w);
248			void ev_check_stop (struct ev_check *w);
249	root	1.12
250	root	1.16	void ev_child_start (struct ev_child *w);
251			void ev_child_stop (struct ev_child *w);
252	root	1.9	#endif
253	root	1.5
254	root	1.19	#ifdef __cplusplus
255			}
256			#endif
257
258	root	1.1	#endif
259