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;

/* these priorities are inclusive, higher priorities will be called earlier */
#ifndef EV_MINPRI
# define EV_MINPRI -2
#endif
#ifndef EV_MAXPRI
# define EV_MAXPRI +2
#endif

#ifndef EV_MULTIPLICITY
# define EV_MULTIPLICITY 1
#endif

#ifndef EV_PERIODICS
# define EV_PERIODICS 1
#endif

/* support multiple event loops? */
#if EV_MULTIPLICITY
struct ev_loop;
# define EV_P struct ev_loop *loop
# define EV_P_ EV_P,
# define EV_A loop
# define EV_A_ EV_A,
# define EV_DEFAULT_A ev_default_loop (0)
# define EV_DEFAULT_A_ EV_DEFAULT_A,
#else
# define EV_P void
# define EV_P_
# define EV_A
# define EV_A_
# define EV_DEFAULT_A
# define EV_DEFAULT_A_
#endif

/* eventmask, revents, events... */
#define EV_UNDEF          -1L /* guaranteed to be invalid */
#define EV_NONE         0x00L 
#define EV_READ         0x01L /* io only */
#define EV_WRITE        0x02L /* io only */
#define EV_TIMEOUT  0x000100L /* timer only */
#define EV_PERIODIC 0x000200L /* periodic timer only */
#define EV_SIGNAL   0x000400L /* signal only */
#define EV_IDLE     0x000800L /* idle only */
#define EV_CHECK    0x001000L /* check only */
#define EV_PREPARE  0x002000L /* prepare only */
#define EV_CHILD    0x004000L /* child/pid only */
#define EV_EMBED    0x008000L /* embedded event loop */
#define EV_ERROR    0x800000L /* sent when an error occurs */

/* can be used to add custom fields to all watchers, while losing binary compatibility */
#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

#ifndef EV_CB_DECLARE
# define EV_CB_DECLARE(type) void (*cb)(EV_P_ struct type *w, int revents);
#endif
#ifndef EV_CB_INVOKE
# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
#endif

/*
 * 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 */                    \
  int priority; /* private */                   \
  EV_COMMON /* rw */                            \
  EV_CB_DECLARE (type) /* private */

#define EV_WATCHER_LIST(type)                   \
  EV_WATCHER (type)                             \
  struct ev_watcher_list *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 */
  ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* 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 given pid */
/* revent EV_CHILD */
/* does not support priorities */
struct ev_child
{
  EV_WATCHER_LIST (ev_child)

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

#if EV_MULTIPLICITY
/* used to embed an event loop inside another */
/* the callback gets invoked when the event loop has handled events, and can be 0 */
struct ev_embed
{
  EV_WATCHER (ev_embed)

  struct ev_io io; /* private */
  struct ev_loop *loop; /* ro */
};
#endif

/* the presence of this union forces similar struct layout */
union ev_any_watcher
{
  struct ev_watcher w;
  struct ev_watcher_list wl;

  struct ev_io io;
  struct ev_timer timer;
  struct ev_periodic periodic;
  struct ev_idle idle;
  struct ev_prepare prepare;
  struct ev_check check;
  struct ev_signal signal;
  struct ev_child child;
  struct ev_embed embed;
};

/* bits for ev_default_loop and ev_loop_new */
/* the default */
#define EVFLAG_AUTO       0x00000000UL /* not quite a mask */
/* flag bits */
#define EVFLAG_NOENV      0x01000000UL /* do NOT consult environment */
/* method bits to be ored together */
#define EVBACKEND_SELECT  0x00000001UL /* about anywhere */
#define EVBACKEND_POLL    0x00000002UL /* !win */
#define EVBACKEND_EPOLL   0x00000004UL /* linux */
#define EVBACKEND_KQUEUE  0x00000008UL /* bsd */
#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 */ /* NYI */
#define EVBACKEND_PORT    0x00000020UL /* solaris 10 */

#if EV_PROTOTYPES
int ev_version_major (void);
int ev_version_minor (void);

unsigned int ev_supported_backends (void);
unsigned int ev_recommended_backends (void);
unsigned int ev_embeddable_backends (void);

ev_tstamp ev_time (void);

/* Sets the allocation function to use, works like realloc.
 * It is used to allocate and free memory.
 * If it returns zero when memory needs to be allocated, the library might abort
 * or take some potentially destructive action.
 * The default is your system realloc function.
 */
void ev_set_allocator (void *(*cb)(void *ptr, long size));

/* set the callback function to call on a
 * retryable syscall error
 * (such as failed select, poll, epoll_wait)
 */
void ev_set_syserr_cb (void (*cb)(const char *msg));

# if EV_MULTIPLICITY
/* the default loop is the only one that handles signals and child watchers */
/* you can call this as often as you like */
static struct ev_loop *
ev_default_loop (unsigned int flags)
{
  extern struct ev_loop *ev_default_loop_ptr;
  extern struct ev_loop *ev_default_loop_init (unsigned int flags);

  if (!ev_default_loop_ptr)
    ev_default_loop_init (flags);

  return ev_default_loop_ptr;
}

/* create and destroy alternative loops that don't handle signals */
struct ev_loop *ev_loop_new (unsigned int flags);
void ev_loop_destroy (EV_P);
void ev_loop_fork (EV_P);

ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */

# else

int ev_default_loop (unsigned int flags); /* returns true when successful */

static ev_tstamp
ev_now (void)
{
  extern ev_tstamp ev_rt_now;

  return ev_rt_now;
}
# endif

void ev_default_destroy (void); /* destroy the default loop */
/* this needs to be called after fork, to duplicate the default loop */
/* if you create alternative loops you have to call ev_loop_fork on them */
/* you can call it in either the parent or the child */
/* you can actually call it at any time, anywhere :) */
void ev_default_fork (void);

unsigned int ev_backend (EV_P);
#endif

#define EVLOOP_NONBLOCK 1 /* do not block/wait */
#define EVLOOP_ONESHOT  2 /* block *once* only */
#define EVUNLOOP_CANCEL 0 /* undo unloop */
#define EVUNLOOP_ONE    1 /* unloop once */
#define EVUNLOOP_ALL    2 /* unloop all loops */

#if EV_PROTOTYPES
void ev_loop (EV_P_ int flags);
void 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 */

/*
 * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
 * keeps one reference. if you have a long-runing watcher you never unregister that
 * should not keep ev_loop from running, unref() after starting, and ref() before stopping.
 */
void ev_ref   (EV_P);
void ev_unref (EV_P);

/* convinience function, wait for a single event, without registering an event watcher */
/* if timeout is < 0, do wait indefinitely */
void ev_once (EV_P_ 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_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
#define ev_init(ev,cb_) do {                            \
  ((struct ev_watcher *)(void *)(ev))->active   =       \
  ((struct ev_watcher *)(void *)(ev))->pending  =       \
  ((struct ev_watcher *)(void *)(ev))->priority = 0;    \
  ev_set_cb ((ev), 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_,ival_,res_)  do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } 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_embed_set(ev,loop_)              do { (ev)->loop = (loop_); } while (0)

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

#define ev_is_pending(ev)                   (0 + ((struct ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
#define ev_is_active(ev)                    (0 + ((struct ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */

#define ev_priority(ev)                     ((struct ev_watcher *)(void *)(ev))->priority /* rw */
#define ev_cb(ev)                           (ev)->cb /* rw */
#define ev_set_priority(ev,pri)             ev_priority (ev) = (pri)

#ifndef ev_set_cb
# define ev_set_cb(ev,cb_)                  ev_cb (ev) = (cb_)
#endif

/* 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

/* feeds an event into a watcher as if the event actually occured */
/* accepts any ev_watcher type */
void ev_feed_event     (EV_P_ void *w, int revents);
void ev_feed_fd_event  (EV_P_ int fd, int revents);
void ev_feed_signal_event (EV_P_ int signum);

void ev_io_start       (EV_P_ struct ev_io *w);
void ev_io_stop        (EV_P_ struct ev_io *w);

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

#if EV_PERIODICS
void ev_periodic_start (EV_P_ struct ev_periodic *w);
void ev_periodic_stop  (EV_P_ struct ev_periodic *w);
void ev_periodic_again (EV_P_ struct ev_periodic *w);
#endif

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

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

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

/* only supported in the default loop */
void ev_signal_start   (EV_P_ struct ev_signal *w);
void ev_signal_stop    (EV_P_ struct ev_signal *w);

/* only supported in the default loop */
void ev_child_start    (EV_P_ struct ev_child *w);
void ev_child_stop     (EV_P_ struct ev_child *w);

# if EV_MULTIPLICITY
/* only supported when loop to be embedded is in fact embeddable */
void ev_embed_start    (EV_P_ struct ev_embed *w);
void ev_embed_stop     (EV_P_ struct ev_embed *w);
# endif

#endif

#ifdef __cplusplus
}
#endif

#endif

Revision:	1.65
Committed:	Sat Nov 24 06:23:27 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.64:	+1 -0 lines
Log Message:	milli-opt
#	Content
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
30	#ifndef EV_H__
31	#define EV_H__
32
33	#ifdef __cplusplus
34	extern "C" {
35	#endif
36
37	typedef double ev_tstamp;
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_PERIODICS
52	# define EV_PERIODICS 1
53	#endif
54
55	/* support multiple event loops? */
56	#if EV_MULTIPLICITY
57	struct ev_loop;
58	# define EV_P struct ev_loop *loop
59	# define EV_P_ EV_P,
60	# define EV_A loop
61	# define EV_A_ EV_A,
62	# define EV_DEFAULT_A ev_default_loop (0)
63	# define EV_DEFAULT_A_ EV_DEFAULT_A,
64	#else
65	# define EV_P void
66	# define EV_P_
67	# define EV_A
68	# define EV_A_
69	# define EV_DEFAULT_A
70	# define EV_DEFAULT_A_
71	#endif
72
73	/* eventmask, revents, events... */
74	#define EV_UNDEF -1L /* guaranteed to be invalid */
75	#define EV_NONE 0x00L
76	#define EV_READ 0x01L /* io only */
77	#define EV_WRITE 0x02L /* io only */
78	#define EV_TIMEOUT 0x000100L /* timer only */
79	#define EV_PERIODIC 0x000200L /* periodic timer only */
80	#define EV_SIGNAL 0x000400L /* signal only */
81	#define EV_IDLE 0x000800L /* idle only */
82	#define EV_CHECK 0x001000L /* check only */
83	#define EV_PREPARE 0x002000L /* prepare only */
84	#define EV_CHILD 0x004000L /* child/pid only */
85	#define EV_EMBED 0x008000L /* embedded event loop */
86	#define EV_ERROR 0x800000L /* sent when an error occurs */
87
88	/* can be used to add custom fields to all watchers, while losing binary compatibility */
89	#ifndef EV_COMMON
90	# define EV_COMMON void *data;
91	#endif
92	#ifndef EV_PROTOTYPES
93	# define EV_PROTOTYPES 1
94	#endif
95
96	#define EV_VERSION_MAJOR 1
97	#define EV_VERSION_MINOR 1
98
99	#ifndef EV_CB_DECLARE
100	# define EV_CB_DECLARE(type) void (cb)(EV_P_ struct type w, int revents);
101	#endif
102	#ifndef EV_CB_INVOKE
103	# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
104	#endif
105
106	/*
107	* struct member types:
108	* private: you can look at them, but not change them, and they might not mean anything to you.
109	* ro: can be read anytime, but only changed when the watcher isn't active
110	* rw: can be read and modified anytime, even when the watcher is active
111	*/
112
113	/* shared by all watchers */
114	#define EV_WATCHER(type) \
115	int active; /* private */ \
116	int pending; /* private */ \
117	int priority; /* private */ \
118	EV_COMMON /* rw */ \
119	EV_CB_DECLARE (type) /* private */
120
121	#define EV_WATCHER_LIST(type) \
122	EV_WATCHER (type) \
123	struct ev_watcher_list next; / private */
124
125	#define EV_WATCHER_TIME(type) \
126	EV_WATCHER (type) \
127	ev_tstamp at; /* private */
128
129	/* base class, nothing to see here unless you subclass */
130	struct ev_watcher
131	{
132	EV_WATCHER (ev_watcher)
133	};
134
135	/* base class, nothing to see here unless you subclass */
136	struct ev_watcher_list
137	{
138	EV_WATCHER_LIST (ev_watcher_list)
139	};
140
141	/* base class, nothing to see here unless you subclass */
142	struct ev_watcher_time
143	{
144	EV_WATCHER_TIME (ev_watcher_time)
145	};
146
147	/* invoked after a specific time, repeatable (based on monotonic clock) */
148	/* revent EV_TIMEOUT */
149	struct ev_timer
150	{
151	EV_WATCHER_TIME (ev_timer)
152
153	ev_tstamp repeat; /* rw */
154	};
155
156	/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
157	/* revent EV_PERIODIC */
158	struct ev_periodic
159	{
160	EV_WATCHER_TIME (ev_periodic)
161
162	ev_tstamp interval; /* rw */
163	ev_tstamp (reschedule_cb)(struct ev_periodic w, ev_tstamp now); /* rw */
164	};
165
166	/* invoked when fd is either EV_READable or EV_WRITEable */
167	/* revent EV_READ, EV_WRITE */
168	struct ev_io
169	{
170	EV_WATCHER_LIST (ev_io)
171
172	int fd; /* ro */
173	int events; /* ro */
174	};
175
176	/* invoked when the given signal has been received */
177	/* revent EV_SIGNAL */
178	struct ev_signal
179	{
180	EV_WATCHER_LIST (ev_signal)
181
182	int signum; /* ro */
183	};
184
185	/* invoked when the nothing else needs to be done, keeps the process from blocking */
186	/* revent EV_IDLE */
187	struct ev_idle
188	{
189	EV_WATCHER (ev_idle)
190	};
191
192	/* invoked for each run of the mainloop, just before the blocking call */
193	/* you can still change events in any way you like */
194	/* revent EV_PREPARE */
195	struct ev_prepare
196	{
197	EV_WATCHER (ev_prepare)
198	};
199
200	/* invoked for each run of the mainloop, just after the blocking call */
201	/* revent EV_CHECK */
202	struct ev_check
203	{
204	EV_WATCHER (ev_check)
205	};
206
207	/* invoked when sigchld is received and waitpid indicates the given pid */
208	/* revent EV_CHILD */
209	/* does not support priorities */
210	struct ev_child
211	{
212	EV_WATCHER_LIST (ev_child)
213
214	int pid; /* ro */
215	int rpid; /* rw, holds the received pid */
216	int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
217	};
218
219	#if EV_MULTIPLICITY
220	/* used to embed an event loop inside another */
221	/* the callback gets invoked when the event loop has handled events, and can be 0 */
222	struct ev_embed
223	{
224	EV_WATCHER (ev_embed)
225
226	struct ev_io io; /* private */
227	struct ev_loop loop; / ro */
228	};
229	#endif
230
231	/* the presence of this union forces similar struct layout */
232	union ev_any_watcher
233	{
234	struct ev_watcher w;
235	struct ev_watcher_list wl;
236
237	struct ev_io io;
238	struct ev_timer timer;
239	struct ev_periodic periodic;
240	struct ev_idle idle;
241	struct ev_prepare prepare;
242	struct ev_check check;
243	struct ev_signal signal;
244	struct ev_child child;
245	struct ev_embed embed;
246	};
247
248	/* bits for ev_default_loop and ev_loop_new */
249	/* the default */
250	#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
251	/* flag bits */
252	#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */
253	/* method bits to be ored together */
254	#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */
255	#define EVBACKEND_POLL 0x00000002UL /* !win */
256	#define EVBACKEND_EPOLL 0x00000004UL /* linux */
257	#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */
258	#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 / / NYI */
259	#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */
260
261	#if EV_PROTOTYPES
262	int ev_version_major (void);
263	int ev_version_minor (void);
264
265	unsigned int ev_supported_backends (void);
266	unsigned int ev_recommended_backends (void);
267	unsigned int ev_embeddable_backends (void);
268
269	ev_tstamp ev_time (void);
270
271	/* Sets the allocation function to use, works like realloc.
272	* It is used to allocate and free memory.
273	* If it returns zero when memory needs to be allocated, the library might abort
274	* or take some potentially destructive action.
275	* The default is your system realloc function.
276	*/
277	void ev_set_allocator (void (cb)(void *ptr, long size));
278
279	/* set the callback function to call on a
280	* retryable syscall error
281	* (such as failed select, poll, epoll_wait)
282	*/
283	void ev_set_syserr_cb (void (cb)(const char msg));
284
285	# if EV_MULTIPLICITY
286	/* the default loop is the only one that handles signals and child watchers */
287	/* you can call this as often as you like */
288	static struct ev_loop *
289	ev_default_loop (unsigned int flags)
290	{
291	extern struct ev_loop *ev_default_loop_ptr;
292	extern struct ev_loop *ev_default_loop_init (unsigned int flags);
293
294	if (!ev_default_loop_ptr)
295	ev_default_loop_init (flags);
296
297	return ev_default_loop_ptr;
298	}
299
300	/* create and destroy alternative loops that don't handle signals */
301	struct ev_loop *ev_loop_new (unsigned int flags);
302	void ev_loop_destroy (EV_P);
303	void ev_loop_fork (EV_P);
304
305	ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
306
307	# else
308
309	int ev_default_loop (unsigned int flags); /* returns true when successful */
310
311	static ev_tstamp
312	ev_now (void)
313	{
314	extern ev_tstamp ev_rt_now;
315
316	return ev_rt_now;
317	}
318	# endif
319
320	void ev_default_destroy (void); /* destroy the default loop */
321	/* this needs to be called after fork, to duplicate the default loop */
322	/* if you create alternative loops you have to call ev_loop_fork on them */
323	/* you can call it in either the parent or the child */
324	/* you can actually call it at any time, anywhere :) */
325	void ev_default_fork (void);
326
327	unsigned int ev_backend (EV_P);
328	#endif
329
330	#define EVLOOP_NONBLOCK 1 /* do not block/wait */
331	#define EVLOOP_ONESHOT 2 /* block once only */
332	#define EVUNLOOP_CANCEL 0 /* undo unloop */
333	#define EVUNLOOP_ONE 1 /* unloop once */
334	#define EVUNLOOP_ALL 2 /* unloop all loops */
335
336	#if EV_PROTOTYPES
337	void ev_loop (EV_P_ int flags);
338	void 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 */
339
340	/*
341	* ref/unref can be used to add or remove a refcount on the mainloop. every watcher
342	* keeps one reference. if you have a long-runing watcher you never unregister that
343	* should not keep ev_loop from running, unref() after starting, and ref() before stopping.
344	*/
345	void ev_ref (EV_P);
346	void ev_unref (EV_P);
347
348	/* convinience function, wait for a single event, without registering an event watcher */
349	/* if timeout is < 0, do wait indefinitely */
350	void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg);
351	#endif
352
353	/* these may evaluate ev multiple times, and the other arguments at most once */
354	/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
355	#define ev_init(ev,cb_) do { \
356	((struct ev_watcher )(void )(ev))->active = \
357	((struct ev_watcher )(void )(ev))->pending = \
358	((struct ev_watcher )(void )(ev))->priority = 0; \
359	ev_set_cb ((ev), cb_); \
360	} while (0)
361
362	#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
363	#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
364	#define ev_periodic_set(ev,at_,ival_,res_) do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
365	#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
366	#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
367	#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
368	#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
369	#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
370	#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0)
371
372	#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
373	#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
374	#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
375	#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
376	#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
377	#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
378	#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
379	#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
380	#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
381
382	#define ev_is_pending(ev) (0 + ((struct ev_watcher )(void )(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
383	#define ev_is_active(ev) (0 + ((struct ev_watcher )(void )(ev))->active) /* ro, true when the watcher has been started */
384
385	#define ev_priority(ev) ((struct ev_watcher )(void )(ev))->priority /* rw */
386	#define ev_cb(ev) (ev)->cb /* rw */
387	#define ev_set_priority(ev,pri) ev_priority (ev) = (pri)
388
389	#ifndef ev_set_cb
390	# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
391	#endif
392
393	/* stopping (enabling, adding) a watcher does nothing if it is already running */
394	/* stopping (disabling, deleting) a watcher does nothing unless its already running */
395	#if EV_PROTOTYPES
396
397	/* feeds an event into a watcher as if the event actually occured */
398	/* accepts any ev_watcher type */
399	void ev_feed_event (EV_P_ void *w, int revents);
400	void ev_feed_fd_event (EV_P_ int fd, int revents);
401	void ev_feed_signal_event (EV_P_ int signum);
402
403	void ev_io_start (EV_P_ struct ev_io *w);
404	void ev_io_stop (EV_P_ struct ev_io *w);
405
406	void ev_timer_start (EV_P_ struct ev_timer *w);
407	void ev_timer_stop (EV_P_ struct ev_timer *w);
408	/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
409	void ev_timer_again (EV_P_ struct ev_timer *w);
410
411	#if EV_PERIODICS
412	void ev_periodic_start (EV_P_ struct ev_periodic *w);
413	void ev_periodic_stop (EV_P_ struct ev_periodic *w);
414	void ev_periodic_again (EV_P_ struct ev_periodic *w);
415	#endif
416
417	void ev_idle_start (EV_P_ struct ev_idle *w);
418	void ev_idle_stop (EV_P_ struct ev_idle *w);
419
420	void ev_prepare_start (EV_P_ struct ev_prepare *w);
421	void ev_prepare_stop (EV_P_ struct ev_prepare *w);
422
423	void ev_check_start (EV_P_ struct ev_check *w);
424	void ev_check_stop (EV_P_ struct ev_check *w);
425
426	/* only supported in the default loop */
427	void ev_signal_start (EV_P_ struct ev_signal *w);
428	void ev_signal_stop (EV_P_ struct ev_signal *w);
429
430	/* only supported in the default loop */
431	void ev_child_start (EV_P_ struct ev_child *w);
432	void ev_child_stop (EV_P_ struct ev_child *w);
433
434	# if EV_MULTIPLICITY
435	/* only supported when loop to be embedded is in fact embeddable */
436	void ev_embed_start (EV_P_ struct ev_embed *w);
437	void ev_embed_stop (EV_P_ struct ev_embed *w);
438	# endif
439
440	#endif
441
442	#ifdef __cplusplus
443	}
444	#endif
445
446	#endif
447