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Comparing libev/ev.c (file contents):
Revision 1.23 by root, Wed Oct 31 20:10:17 2007 UTC vs.
Revision 1.139 by root, Sun Nov 25 09:24:37 2007 UTC

1	/*	1	/*
		2	* libev event processing core, watcher management
		3	*
2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>	4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3	* All rights reserved.	5	* All rights reserved.
4	*	6	*
5	* Redistribution and use in source and binary forms, with or without	7	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions are	8	* modification, are permitted provided that the following conditions are
…		…
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE	28	* (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.	29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	30	*/
29		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	#endif
		100
30	#include <math.h>	101	#include <math.h>
31	#include <stdlib.h>	102	#include <stdlib.h>
32	#include <unistd.h>
33	#include <fcntl.h>	103	#include <fcntl.h>
34	#include <signal.h>
35	#include <stddef.h>	104	#include <stddef.h>
36		105
37	#include <stdio.h>	106	#include <stdio.h>
38		107
39	#include <assert.h>	108	#include <assert.h>
40	#include <errno.h>	109	#include <errno.h>
41	#include <sys/types.h>	110	#include <sys/types.h>
42	#include <sys/wait.h>
43	#include <sys/time.h>
44	#include <time.h>	111	#include <time.h>
45		112
46	#ifndef HAVE_MONOTONIC	113	#include <signal.h>
47	# ifdef CLOCK_MONOTONIC	114
48	# define HAVE_MONOTONIC 1	115	#ifndef _WIN32
		116	# include <unistd.h>
		117	# include <sys/time.h>
		118	# include <sys/wait.h>
		119	#else
		120	# define WIN32_LEAN_AND_MEAN
		121	# include <windows.h>
		122	# ifndef EV_SELECT_IS_WINSOCKET
		123	# define EV_SELECT_IS_WINSOCKET 1
49	# endif	124	# endif
50	#endif	125	#endif
51		126
		127	/**/
		128
		129	#ifndef EV_USE_MONOTONIC
		130	# define EV_USE_MONOTONIC 0
		131	#endif
		132
		133	#ifndef EV_USE_REALTIME
		134	# define EV_USE_REALTIME 0
		135	#endif
		136
52	#ifndef HAVE_SELECT	137	#ifndef EV_USE_SELECT
53	# define HAVE_SELECT 1	138	# define EV_USE_SELECT 1
		139	#endif
		140
		141	#ifndef EV_USE_POLL
		142	# ifdef _WIN32
		143	# define EV_USE_POLL 0
		144	# else
		145	# define EV_USE_POLL 1
54	#endif	146	# endif
		147	#endif
55		148
56	#ifndef HAVE_EPOLL	149	#ifndef EV_USE_EPOLL
57	# define HAVE_EPOLL 0	150	# define EV_USE_EPOLL 0
58	#endif	151	#endif
59		152
		153	#ifndef EV_USE_KQUEUE
		154	# define EV_USE_KQUEUE 0
		155	#endif
		156
		157	#ifndef EV_USE_PORT
		158	# define EV_USE_PORT 0
		159	#endif
		160
		161	/**/
		162
		163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
		165	# define EV_USE_MONOTONIC 0
		166	#endif
		167
60	#ifndef HAVE_REALTIME	168	#ifndef CLOCK_REALTIME
61	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	169	# undef EV_USE_REALTIME
		170	# define EV_USE_REALTIME 0
62	#endif	171	#endif
		172
		173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
		176
		177	/**/
63		178
64	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	179	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
65	#define MAX_BLOCKTIME 60.	180	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
66	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */	181	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		182	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
67		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
68	#include "ev.h"	187	# include "ev.h"
		188	#endif
69		189
		190	#if __GNUC__ >= 3
		191	# define expect(expr,value) __builtin_expect ((expr),(value))
		192	# define inline static inline
		193	#else
		194	# define expect(expr,value) (expr)
		195	# define inline static
		196	#endif
		197
		198	#define expect_false(expr) expect ((expr) != 0, 0)
		199	#define expect_true(expr) expect ((expr) != 0, 1)
		200
		201	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		202	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		203
		204	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		205	#define EMPTY2(a,b) /* used to suppress some warnings */
		206
70	typedef struct ev_watcher *W;	207	typedef ev_watcher *W;
71	typedef struct ev_watcher_list *WL;	208	typedef ev_watcher_list *WL;
72	typedef struct ev_watcher_time *WT;	209	typedef ev_watcher_time *WT;
73		210
74	static ev_tstamp now, diff; /* monotonic clock */	211	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		212
		213	#ifdef _WIN32
		214	# include "ev_win32.c"
		215	#endif
		216
		217	/*****************************************************************************/
		218
		219	static void (*syserr_cb)(const char *msg);
		220
		221	void ev_set_syserr_cb (void (*cb)(const char *msg))
		222	{
		223	syserr_cb = cb;
		224	}
		225
		226	static void
		227	syserr (const char *msg)
		228	{
		229	if (!msg)
		230	msg = "(libev) system error";
		231
		232	if (syserr_cb)
		233	syserr_cb (msg);
		234	else
		235	{
		236	perror (msg);
		237	abort ();
		238	}
		239	}
		240
		241	static void *(*alloc)(void *ptr, long size);
		242
		243	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		244	{
		245	alloc = cb;
		246	}
		247
		248	static void *
		249	ev_realloc (void *ptr, long size)
		250	{
		251	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		252
		253	if (!ptr && size)
		254	{
		255	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		256	abort ();
		257	}
		258
		259	return ptr;
		260	}
		261
		262	#define ev_malloc(size) ev_realloc (0, (size))
		263	#define ev_free(ptr) ev_realloc ((ptr), 0)
		264
		265	/*****************************************************************************/
		266
		267	typedef struct
		268	{
		269	WL head;
		270	unsigned char events;
		271	unsigned char reify;
		272	#if EV_SELECT_IS_WINSOCKET
		273	SOCKET handle;
		274	#endif
		275	} ANFD;
		276
		277	typedef struct
		278	{
		279	W w;
		280	int events;
		281	} ANPENDING;
		282
		283	#if EV_MULTIPLICITY
		284
		285	struct ev_loop
		286	{
		287	ev_tstamp ev_rt_now;
		288	#define ev_rt_now ((loop)->ev_rt_now)
		289	#define VAR(name,decl) decl;
		290	#include "ev_vars.h"
		291	#undef VAR
		292	};
		293	#include "ev_wrap.h"
		294
		295	static struct ev_loop default_loop_struct;
		296	struct ev_loop *ev_default_loop_ptr;
		297
		298	#else
		299
75	ev_tstamp ev_now;	300	ev_tstamp ev_rt_now;
76	int ev_method;	301	#define VAR(name,decl) static decl;
		302	#include "ev_vars.h"
		303	#undef VAR
77		304
78	static int have_monotonic; /* runtime */	305	static int ev_default_loop_ptr;
79		306
80	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	307	#endif
81	static void (*method_modify)(int fd, int oev, int nev);
82	static void (*method_poll)(ev_tstamp timeout);
83		308
84	/*****************************************************************************/	309	/*****************************************************************************/
85		310
86	ev_tstamp	311	ev_tstamp
87	ev_time (void)	312	ev_time (void)
88	{	313	{
89	#if HAVE_REALTIME	314	#if EV_USE_REALTIME
90	struct timespec ts;	315	struct timespec ts;
91	clock_gettime (CLOCK_REALTIME, &ts);	316	clock_gettime (CLOCK_REALTIME, &ts);
92	return ts.tv_sec + ts.tv_nsec * 1e-9;	317	return ts.tv_sec + ts.tv_nsec * 1e-9;
93	#else	318	#else
94	struct timeval tv;	319	struct timeval tv;
95	gettimeofday (&tv, 0);	320	gettimeofday (&tv, 0);
96	return tv.tv_sec + tv.tv_usec * 1e-6;	321	return tv.tv_sec + tv.tv_usec * 1e-6;
97	#endif	322	#endif
98	}	323	}
99		324
100	static ev_tstamp	325	inline ev_tstamp
101	get_clock (void)	326	get_clock (void)
102	{	327	{
103	#if HAVE_MONOTONIC	328	#if EV_USE_MONOTONIC
104	if (have_monotonic)	329	if (expect_true (have_monotonic))
105	{	330	{
106	struct timespec ts;	331	struct timespec ts;
107	clock_gettime (CLOCK_MONOTONIC, &ts);	332	clock_gettime (CLOCK_MONOTONIC, &ts);
108	return ts.tv_sec + ts.tv_nsec * 1e-9;	333	return ts.tv_sec + ts.tv_nsec * 1e-9;
109	}	334	}
110	#endif	335	#endif
111		336
112	return ev_time ();	337	return ev_time ();
113	}	338	}
114		339
		340	#if EV_MULTIPLICITY
		341	ev_tstamp
		342	ev_now (EV_P)
		343	{
		344	return ev_rt_now;
		345	}
		346	#endif
		347
		348	#define array_roundsize(type,n) (((n) | 4) & ~3)
		349
115	#define array_needsize(base,cur,cnt,init) \	350	#define array_needsize(type,base,cur,cnt,init) \
116	if ((cnt) > cur) \	351	if (expect_false ((cnt) > cur)) \
117	{ \	352	{ \
118	int newcnt = cur; \	353	int newcnt = cur; \
119	do \	354	do \
120	{ \	355	{ \
121	newcnt = (newcnt << 1) | 4 & ~3; \	356	newcnt = array_roundsize (type, newcnt << 1); \
122	} \	357	} \
123	while ((cnt) > newcnt); \	358	while ((cnt) > newcnt); \
124	\	359	\
125	base = realloc (base, sizeof (*base) * (newcnt)); \	360	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
126	init (base + cur, newcnt - cur); \	361	init (base + cur, newcnt - cur); \
127	cur = newcnt; \	362	cur = newcnt; \
128	}	363	}
		364
		365	#define array_slim(type,stem) \
		366	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		367	{ \
		368	stem ## max = array_roundsize (stem ## cnt >> 1); \
		369	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		370	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		371	}
		372
		373	#define array_free(stem, idx) \
		374	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
129		375
130	/*****************************************************************************/	376	/*****************************************************************************/
131		377
		378	static void
		379	anfds_init (ANFD *base, int count)
		380	{
		381	while (count--)
		382	{
		383	base->head = 0;
		384	base->events = EV_NONE;
		385	base->reify = 0;
		386
		387	++base;
		388	}
		389	}
		390
		391	void
		392	ev_feed_event (EV_P_ void *w, int revents)
		393	{
		394	W w_ = (W)w;
		395
		396	if (expect_false (w_->pending))
		397	{
		398	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		399	return;
		400	}
		401
		402	w_->pending = ++pendingcnt [ABSPRI (w_)];
		403	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		404	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		405	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		406	}
		407
		408	static void
		409	queue_events (EV_P_ W *events, int eventcnt, int type)
		410	{
		411	int i;
		412
		413	for (i = 0; i < eventcnt; ++i)
		414	ev_feed_event (EV_A_ events [i], type);
		415	}
		416
		417	inline void
		418	fd_event (EV_P_ int fd, int revents)
		419	{
		420	ANFD *anfd = anfds + fd;
		421	ev_io *w;
		422
		423	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		424	{
		425	int ev = w->events & revents;
		426
		427	if (ev)
		428	ev_feed_event (EV_A_ (W)w, ev);
		429	}
		430	}
		431
		432	void
		433	ev_feed_fd_event (EV_P_ int fd, int revents)
		434	{
		435	fd_event (EV_A_ fd, revents);
		436	}
		437
		438	/*****************************************************************************/
		439
		440	inline void
		441	fd_reify (EV_P)
		442	{
		443	int i;
		444
		445	for (i = 0; i < fdchangecnt; ++i)
		446	{
		447	int fd = fdchanges [i];
		448	ANFD *anfd = anfds + fd;
		449	ev_io *w;
		450
		451	int events = 0;
		452
		453	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		454	events |= w->events;
		455
		456	#if EV_SELECT_IS_WINSOCKET
		457	if (events)
		458	{
		459	unsigned long argp;
		460	anfd->handle = _get_osfhandle (fd);
		461	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		462	}
		463	#endif
		464
		465	anfd->reify = 0;
		466
		467	backend_modify (EV_A_ fd, anfd->events, events);
		468	anfd->events = events;
		469	}
		470
		471	fdchangecnt = 0;
		472	}
		473
		474	static void
		475	fd_change (EV_P_ int fd)
		476	{
		477	if (expect_false (anfds [fd].reify))
		478	return;
		479
		480	anfds [fd].reify = 1;
		481
		482	++fdchangecnt;
		483	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		484	fdchanges [fdchangecnt - 1] = fd;
		485	}
		486
		487	static void
		488	fd_kill (EV_P_ int fd)
		489	{
		490	ev_io *w;
		491
		492	while ((w = (ev_io *)anfds [fd].head))
		493	{
		494	ev_io_stop (EV_A_ w);
		495	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		496	}
		497	}
		498
		499	inline int
		500	fd_valid (int fd)
		501	{
		502	#ifdef _WIN32
		503	return _get_osfhandle (fd) != -1;
		504	#else
		505	return fcntl (fd, F_GETFD) != -1;
		506	#endif
		507	}
		508
		509	/* called on EBADF to verify fds */
		510	static void
		511	fd_ebadf (EV_P)
		512	{
		513	int fd;
		514
		515	for (fd = 0; fd < anfdmax; ++fd)
		516	if (anfds [fd].events)
		517	if (!fd_valid (fd) == -1 && errno == EBADF)
		518	fd_kill (EV_A_ fd);
		519	}
		520
		521	/* called on ENOMEM in select/poll to kill some fds and retry */
		522	static void
		523	fd_enomem (EV_P)
		524	{
		525	int fd;
		526
		527	for (fd = anfdmax; fd--; )
		528	if (anfds [fd].events)
		529	{
		530	fd_kill (EV_A_ fd);
		531	return;
		532	}
		533	}
		534
		535	/* usually called after fork if backend needs to re-arm all fds from scratch */
		536	static void
		537	fd_rearm_all (EV_P)
		538	{
		539	int fd;
		540
		541	/* this should be highly optimised to not do anything but set a flag */
		542	for (fd = 0; fd < anfdmax; ++fd)
		543	if (anfds [fd].events)
		544	{
		545	anfds [fd].events = 0;
		546	fd_change (EV_A_ fd);
		547	}
		548	}
		549
		550	/*****************************************************************************/
		551
		552	static void
		553	upheap (WT *heap, int k)
		554	{
		555	WT w = heap [k];
		556
		557	while (k && heap [k >> 1]->at > w->at)
		558	{
		559	heap [k] = heap [k >> 1];
		560	((W)heap [k])->active = k + 1;
		561	k >>= 1;
		562	}
		563
		564	heap [k] = w;
		565	((W)heap [k])->active = k + 1;
		566
		567	}
		568
		569	static void
		570	downheap (WT *heap, int N, int k)
		571	{
		572	WT w = heap [k];
		573
		574	while (k < (N >> 1))
		575	{
		576	int j = k << 1;
		577
		578	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		579	++j;
		580
		581	if (w->at <= heap [j]->at)
		582	break;
		583
		584	heap [k] = heap [j];
		585	((W)heap [k])->active = k + 1;
		586	k = j;
		587	}
		588
		589	heap [k] = w;
		590	((W)heap [k])->active = k + 1;
		591	}
		592
		593	inline void
		594	adjustheap (WT *heap, int N, int k)
		595	{
		596	upheap (heap, k);
		597	downheap (heap, N, k);
		598	}
		599
		600	/*****************************************************************************/
		601
132	typedef struct	602	typedef struct
133	{	603	{
134	struct ev_io *head;	604	WL head;
135	unsigned char wev, rev; /* want, received event set */
136	} ANFD;
137
138	static ANFD *anfds;
139	static int anfdmax;
140
141	static int *fdchanges;
142	static int fdchangemax, fdchangecnt;
143
144	static void
145	anfds_init (ANFD *base, int count)
146	{
147	while (count--)
148	{
149	base->head = 0;
150	base->wev = base->rev = EV_NONE;
151	++base;
152	}
153	}
154
155	typedef struct
156	{
157	W w;
158	int events;
159	} ANPENDING;
160
161	static ANPENDING *pendings;
162	static int pendingmax, pendingcnt;
163
164	static void
165	event (W w, int events)
166	{
167	if (w->active)
168	{
169	w->pending = ++pendingcnt;
170	array_needsize (pendings, pendingmax, pendingcnt, );
171	pendings [pendingcnt - 1].w = w;
172	pendings [pendingcnt - 1].events = events;
173	}
174	}
175
176	static void
177	fd_event (int fd, int events)
178	{
179	ANFD *anfd = anfds + fd;
180	struct ev_io *w;
181
182	for (w = anfd->head; w; w = w->next)
183	{
184	int ev = w->events & events;
185
186	if (ev)
187	event ((W)w, ev);
188	}
189	}
190
191	static void
192	queue_events (W *events, int eventcnt, int type)
193	{
194	int i;
195
196	for (i = 0; i < eventcnt; ++i)
197	event (events [i], type);
198	}
199
200	/* called on EBADF to verify fds */
201	static void
202	fd_recheck ()
203	{
204	int fd;
205
206	for (fd = 0; fd < anfdmax; ++fd)
207	if (anfds [fd].wev)
208	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
209	while (anfds [fd].head)
210	evio_stop (anfds [fd].head);
211	}
212
213	/*****************************************************************************/
214
215	static struct ev_timer **timers;
216	static int timermax, timercnt;
217
218	static struct ev_periodic **periodics;
219	static int periodicmax, periodiccnt;
220
221	static void
222	upheap (WT *timers, int k)
223	{
224	WT w = timers [k];
225
226	while (k && timers [k >> 1]->at > w->at)
227	{
228	timers [k] = timers [k >> 1];
229	timers [k]->active = k + 1;
230	k >>= 1;
231	}
232
233	timers [k] = w;
234	timers [k]->active = k + 1;
235
236	}
237
238	static void
239	downheap (WT *timers, int N, int k)
240	{
241	WT w = timers [k];
242
243	while (k < (N >> 1))
244	{
245	int j = k << 1;
246
247	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
248	++j;
249
250	if (w->at <= timers [j]->at)
251	break;
252
253	timers [k] = timers [j];
254	timers [k]->active = k + 1;
255	k = j;
256	}
257
258	timers [k] = w;
259	timers [k]->active = k + 1;
260	}
261
262	/*****************************************************************************/
263
264	typedef struct
265	{
266	struct ev_signal *head;
267	sig_atomic_t gotsig;	605	sig_atomic_t volatile gotsig;
268	} ANSIG;	606	} ANSIG;
269		607
270	static ANSIG *signals;	608	static ANSIG *signals;
271	static int signalmax;	609	static int signalmax;
272		610
273	static int sigpipe [2];	611	static int sigpipe [2];
274	static sig_atomic_t gotsig;	612	static sig_atomic_t volatile gotsig;
275	static struct ev_io sigev;	613	static ev_io sigev;
276		614
277	static void	615	static void
278	signals_init (ANSIG *base, int count)	616	signals_init (ANSIG *base, int count)
279	{	617	{
280	while (count--)	618	while (count--)
281	{	619	{
282	base->head = 0;	620	base->head = 0;
283	base->gotsig = 0;	621	base->gotsig = 0;
		622
284	++base;	623	++base;
285	}	624	}
286	}	625	}
287		626
288	static void	627	static void
289	sighandler (int signum)	628	sighandler (int signum)
290	{	629	{
		630	#if _WIN32
		631	signal (signum, sighandler);
		632	#endif
		633
291	signals [signum - 1].gotsig = 1;	634	signals [signum - 1].gotsig = 1;
292		635
293	if (!gotsig)	636	if (!gotsig)
294	{	637	{
		638	int old_errno = errno;
295	gotsig = 1;	639	gotsig = 1;
296	write (sigpipe [1], &gotsig, 1);	640	write (sigpipe [1], &signum, 1);
		641	errno = old_errno;
297	}	642	}
298	}	643	}
299		644
		645	void
		646	ev_feed_signal_event (EV_P_ int signum)
		647	{
		648	WL w;
		649
		650	#if EV_MULTIPLICITY
		651	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		652	#endif
		653
		654	--signum;
		655
		656	if (signum < 0 || signum >= signalmax)
		657	return;
		658
		659	signals [signum].gotsig = 0;
		660
		661	for (w = signals [signum].head; w; w = w->next)
		662	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		663	}
		664
300	static void	665	static void
301	sigcb (struct ev_io *iow, int revents)	666	sigcb (EV_P_ ev_io *iow, int revents)
302	{	667	{
303	struct ev_signal *w;
304	int sig;	668	int signum;
305		669
		670	read (sigpipe [0], &revents, 1);
306	gotsig = 0;	671	gotsig = 0;
307	read (sigpipe [0], &revents, 1);
308		672
309	for (sig = signalmax; sig--; )	673	for (signum = signalmax; signum--; )
310	if (signals [sig].gotsig)	674	if (signals [signum].gotsig)
311	{	675	ev_feed_signal_event (EV_A_ signum + 1);
312	signals [sig].gotsig = 0;
313
314	for (w = signals [sig].head; w; w = w->next)
315	event ((W)w, EV_SIGNAL);
316	}
317	}	676	}
318		677
319	static void	678	static void
320	siginit (void)	679	fd_intern (int fd)
321	{	680	{
		681	#ifdef _WIN32
		682	int arg = 1;
		683	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		684	#else
322	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	685	fcntl (fd, F_SETFD, FD_CLOEXEC);
323	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
324
325	/* rather than sort out wether we really need nb, set it */
326	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	686	fcntl (fd, F_SETFL, O_NONBLOCK);
327	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	687	#endif
		688	}
328		689
		690	static void
		691	siginit (EV_P)
		692	{
		693	fd_intern (sigpipe [0]);
		694	fd_intern (sigpipe [1]);
		695
329	evio_set (&sigev, sigpipe [0], EV_READ);	696	ev_io_set (&sigev, sigpipe [0], EV_READ);
330	evio_start (&sigev);	697	ev_io_start (EV_A_ &sigev);
		698	ev_unref (EV_A); /* child watcher should not keep loop alive */
331	}	699	}
332		700
333	/*****************************************************************************/	701	/*****************************************************************************/
334		702
335	static struct ev_idle **idles;
336	static int idlemax, idlecnt;
337
338	static struct ev_prepare **prepares;
339	static int preparemax, preparecnt;
340
341	static struct ev_check **checks;
342	static int checkmax, checkcnt;
343
344	/*****************************************************************************/
345
346	static struct ev_child *childs [PID_HASHSIZE];	703	static ev_child *childs [PID_HASHSIZE];
		704
		705	#ifndef _WIN32
		706
347	static struct ev_signal childev;	707	static ev_signal childev;
348		708
349	#ifndef WCONTINUED	709	#ifndef WCONTINUED
350	# define WCONTINUED 0	710	# define WCONTINUED 0
351	#endif	711	#endif
352		712
353	static void	713	static void
		714	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		715	{
		716	ev_child *w;
		717
		718	for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		719	if (w->pid == pid || !w->pid)
		720	{
		721	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		722	w->rpid = pid;
		723	w->rstatus = status;
		724	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		725	}
		726	}
		727
		728	static void
354	childcb (struct ev_signal *sw, int revents)	729	childcb (EV_P_ ev_signal *sw, int revents)
355	{	730	{
356	struct ev_child *w;
357	int pid, status;	731	int pid, status;
358		732
359	while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)	733	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
360	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)	734	{
361	if (w->pid == pid || w->pid == -1)	735	/* make sure we are called again until all childs have been reaped */
362	{	736	/* we need to do it this way so that the callback gets called before we continue */
363	w->status = status;	737	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
364	event ((W)w, EV_CHILD);	738
365	}	739	child_reap (EV_A_ sw, pid, pid, status);
		740	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		741	}
366	}	742	}
		743
		744	#endif
367		745
368	/*****************************************************************************/	746	/*****************************************************************************/
369		747
		748	#if EV_USE_PORT
		749	# include "ev_port.c"
		750	#endif
		751	#if EV_USE_KQUEUE
		752	# include "ev_kqueue.c"
		753	#endif
370	#if HAVE_EPOLL	754	#if EV_USE_EPOLL
371	# include "ev_epoll.c"	755	# include "ev_epoll.c"
372	#endif	756	#endif
		757	#if EV_USE_POLL
		758	# include "ev_poll.c"
		759	#endif
373	#if HAVE_SELECT	760	#if EV_USE_SELECT
374	# include "ev_select.c"	761	# include "ev_select.c"
375	#endif	762	#endif
376		763
377	int ev_init (int flags)	764	int
		765	ev_version_major (void)
378	{	766	{
379	if (!ev_method)	767	return EV_VERSION_MAJOR;
		768	}
		769
		770	int
		771	ev_version_minor (void)
		772	{
		773	return EV_VERSION_MINOR;
		774	}
		775
		776	/* return true if we are running with elevated privileges and should ignore env variables */
		777	static int
		778	enable_secure (void)
		779	{
		780	#ifdef _WIN32
		781	return 0;
		782	#else
		783	return getuid () != geteuid ()
		784	|| getgid () != getegid ();
		785	#endif
		786	}
		787
		788	unsigned int
		789	ev_supported_backends (void)
		790	{
		791	unsigned int flags = 0;
		792
		793	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		794	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		795	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		796	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		797	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		798
		799	return flags;
		800	}
		801
		802	unsigned int
		803	ev_recommended_backends (void)
		804	{
		805	unsigned int flags = ev_supported_backends ();
		806
		807	#ifndef __NetBSD__
		808	/* kqueue is borked on everything but netbsd apparently */
		809	/* it usually doesn't work correctly on anything but sockets and pipes */
		810	flags &= ~EVBACKEND_KQUEUE;
		811	#endif
		812	#ifdef __APPLE__
		813	// flags &= ~EVBACKEND_KQUEUE; for documentation
		814	flags &= ~EVBACKEND_POLL;
		815	#endif
		816
		817	return flags;
		818	}
		819
		820	unsigned int
		821	ev_embeddable_backends (void)
		822	{
		823	return EVBACKEND_EPOLL
		824	| EVBACKEND_KQUEUE
		825	| EVBACKEND_PORT;
		826	}
		827
		828	unsigned int
		829	ev_backend (EV_P)
		830	{
		831	return backend;
		832	}
		833
		834	static void
		835	loop_init (EV_P_ unsigned int flags)
		836	{
		837	if (!backend)
380	{	838	{
381	#if HAVE_MONOTONIC	839	#if EV_USE_MONOTONIC
382	{	840	{
383	struct timespec ts;	841	struct timespec ts;
384	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	842	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
385	have_monotonic = 1;	843	have_monotonic = 1;
386	}	844	}
387	#endif	845	#endif
388		846
389	ev_now = ev_time ();	847	ev_rt_now = ev_time ();
390	now = get_clock ();	848	mn_now = get_clock ();
		849	now_floor = mn_now;
391	diff = ev_now - now;	850	rtmn_diff = ev_rt_now - mn_now;
392		851
		852	if (!(flags & EVFLAG_NOENV)
		853	&& !enable_secure ()
		854	&& getenv ("LIBEV_FLAGS"))
		855	flags = atoi (getenv ("LIBEV_FLAGS"));
		856
		857	if (!(flags & 0x0000ffffUL))
		858	flags |= ev_recommended_backends ();
		859
		860	backend = 0;
		861	#if EV_USE_PORT
		862	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		863	#endif
		864	#if EV_USE_KQUEUE
		865	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		866	#endif
		867	#if EV_USE_EPOLL
		868	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		869	#endif
		870	#if EV_USE_POLL
		871	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		872	#endif
		873	#if EV_USE_SELECT
		874	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		875	#endif
		876
		877	ev_init (&sigev, sigcb);
		878	ev_set_priority (&sigev, EV_MAXPRI);
		879	}
		880	}
		881
		882	static void
		883	loop_destroy (EV_P)
		884	{
		885	int i;
		886
		887	#if EV_USE_PORT
		888	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		889	#endif
		890	#if EV_USE_KQUEUE
		891	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		892	#endif
		893	#if EV_USE_EPOLL
		894	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		895	#endif
		896	#if EV_USE_POLL
		897	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		898	#endif
		899	#if EV_USE_SELECT
		900	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		901	#endif
		902
		903	for (i = NUMPRI; i--; )
		904	array_free (pending, [i]);
		905
		906	/* have to use the microsoft-never-gets-it-right macro */
		907	array_free (fdchange, EMPTY0);
		908	array_free (timer, EMPTY0);
		909	#if EV_PERIODICS
		910	array_free (periodic, EMPTY0);
		911	#endif
		912	array_free (idle, EMPTY0);
		913	array_free (prepare, EMPTY0);
		914	array_free (check, EMPTY0);
		915
		916	backend = 0;
		917	}
		918
		919	static void
		920	loop_fork (EV_P)
		921	{
		922	#if EV_USE_PORT
		923	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		924	#endif
		925	#if EV_USE_KQUEUE
		926	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		927	#endif
		928	#if EV_USE_EPOLL
		929	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		930	#endif
		931
		932	if (ev_is_active (&sigev))
		933	{
		934	/* default loop */
		935
		936	ev_ref (EV_A);
		937	ev_io_stop (EV_A_ &sigev);
		938	close (sigpipe [0]);
		939	close (sigpipe [1]);
		940
		941	while (pipe (sigpipe))
		942	syserr ("(libev) error creating pipe");
		943
		944	siginit (EV_A);
		945	}
		946
		947	postfork = 0;
		948	}
		949
		950	#if EV_MULTIPLICITY
		951	struct ev_loop *
		952	ev_loop_new (unsigned int flags)
		953	{
		954	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		955
		956	memset (loop, 0, sizeof (struct ev_loop));
		957
		958	loop_init (EV_A_ flags);
		959
		960	if (ev_backend (EV_A))
		961	return loop;
		962
		963	return 0;
		964	}
		965
		966	void
		967	ev_loop_destroy (EV_P)
		968	{
		969	loop_destroy (EV_A);
		970	ev_free (loop);
		971	}
		972
		973	void
		974	ev_loop_fork (EV_P)
		975	{
		976	postfork = 1;
		977	}
		978
		979	#endif
		980
		981	#if EV_MULTIPLICITY
		982	struct ev_loop *
		983	ev_default_loop_init (unsigned int flags)
		984	#else
		985	int
		986	ev_default_loop (unsigned int flags)
		987	#endif
		988	{
		989	if (sigpipe [0] == sigpipe [1])
393	if (pipe (sigpipe))	990	if (pipe (sigpipe))
394	return 0;	991	return 0;
395		992
396	ev_method = EVMETHOD_NONE;	993	if (!ev_default_loop_ptr)
397	#if HAVE_EPOLL	994	{
398	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	995	#if EV_MULTIPLICITY
		996	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		997	#else
		998	ev_default_loop_ptr = 1;
399	#endif	999	#endif
400	#if HAVE_SELECT
401	if (ev_method == EVMETHOD_NONE) select_init (flags);
402	#endif
403		1000
404	if (ev_method)	1001	loop_init (EV_A_ flags);
		1002
		1003	if (ev_backend (EV_A))
405	{	1004	{
406	evw_init (&sigev, sigcb);
407	siginit ();	1005	siginit (EV_A);
408		1006
		1007	#ifndef _WIN32
409	evsignal_init (&childev, childcb, SIGCHLD);	1008	ev_signal_init (&childev, childcb, SIGCHLD);
		1009	ev_set_priority (&childev, EV_MAXPRI);
410	evsignal_start (&childev);	1010	ev_signal_start (EV_A_ &childev);
		1011	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1012	#endif
411	}	1013	}
		1014	else
		1015	ev_default_loop_ptr = 0;
412	}	1016	}
413		1017
414	return ev_method;	1018	return ev_default_loop_ptr;
		1019	}
		1020
		1021	void
		1022	ev_default_destroy (void)
		1023	{
		1024	#if EV_MULTIPLICITY
		1025	struct ev_loop *loop = ev_default_loop_ptr;
		1026	#endif
		1027
		1028	#ifndef _WIN32
		1029	ev_ref (EV_A); /* child watcher */
		1030	ev_signal_stop (EV_A_ &childev);
		1031	#endif
		1032
		1033	ev_ref (EV_A); /* signal watcher */
		1034	ev_io_stop (EV_A_ &sigev);
		1035
		1036	close (sigpipe [0]); sigpipe [0] = 0;
		1037	close (sigpipe [1]); sigpipe [1] = 0;
		1038
		1039	loop_destroy (EV_A);
		1040	}
		1041
		1042	void
		1043	ev_default_fork (void)
		1044	{
		1045	#if EV_MULTIPLICITY
		1046	struct ev_loop *loop = ev_default_loop_ptr;
		1047	#endif
		1048
		1049	if (backend)
		1050	postfork = 1;
415	}	1051	}
416		1052
417	/*****************************************************************************/	1053	/*****************************************************************************/
418		1054
419	void ev_prefork (void)
420	{
421	/* nop */
422	}
423
424	void ev_postfork_parent (void)
425	{
426	/* nop */
427	}
428
429	void ev_postfork_child (void)
430	{
431	#if HAVE_EPOLL
432	if (ev_method == EVMETHOD_EPOLL)
433	epoll_postfork_child ();
434	#endif
435
436	evio_stop (&sigev);
437	close (sigpipe [0]);
438	close (sigpipe [1]);
439	pipe (sigpipe);
440	siginit ();
441	}
442
443	/*****************************************************************************/
444
445	static void	1055	static int
446	fd_reify (void)	1056	any_pending (EV_P)
447	{	1057	{
448	int i;	1058	int pri;
449		1059
450	for (i = 0; i < fdchangecnt; ++i)	1060	for (pri = NUMPRI; pri--; )
		1061	if (pendingcnt [pri])
		1062	return 1;
		1063
		1064	return 0;
		1065	}
		1066
		1067	inline void
		1068	call_pending (EV_P)
		1069	{
		1070	int pri;
		1071
		1072	for (pri = NUMPRI; pri--; )
		1073	while (pendingcnt [pri])
451	{	1074	{
452	int fd = fdchanges [i];	1075	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
453	ANFD *anfd = anfds + fd;
454	struct ev_io *w;
455		1076
456	int wev = 0;	1077	if (expect_true (p->w))
457
458	for (w = anfd->head; w; w = w->next)
459	wev |= w->events;
460
461	if (anfd->wev != wev)
462	{	1078	{
463	method_modify (fd, anfd->wev, wev);	1079	assert (("non-pending watcher on pending list", p->w->pending));
464	anfd->wev = wev;
465	}
466	}
467		1080
468	fdchangecnt = 0;
469	}
470
471	static void
472	call_pending ()
473	{
474	while (pendingcnt)
475	{
476	ANPENDING *p = pendings + --pendingcnt;
477
478	if (p->w)
479	{
480	p->w->pending = 0;	1081	p->w->pending = 0;
481	p->w->cb (p->w, p->events);	1082	EV_CB_INVOKE (p->w, p->events);
482	}	1083	}
483	}	1084	}
484	}	1085	}
485		1086
486	static void	1087	inline void
487	timers_reify ()	1088	timers_reify (EV_P)
488	{	1089	{
489	while (timercnt && timers [0]->at <= now)	1090	while (timercnt && ((WT)timers [0])->at <= mn_now)
490	{	1091	{
491	struct ev_timer *w = timers [0];	1092	ev_timer *w = timers [0];
492		1093
493	event ((W)w, EV_TIMEOUT);	1094	assert (("inactive timer on timer heap detected", ev_is_active (w)));
494		1095
495	/* first reschedule or stop timer */	1096	/* first reschedule or stop timer */
496	if (w->repeat)	1097	if (w->repeat)
497	{	1098	{
		1099	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1100
498	w->at = now + w->repeat;	1101	((WT)w)->at += w->repeat;
499	assert (("timer timeout in the past, negative repeat?", w->at > now));	1102	if (((WT)w)->at < mn_now)
		1103	((WT)w)->at = mn_now;
		1104
500	downheap ((WT *)timers, timercnt, 0);	1105	downheap ((WT *)timers, timercnt, 0);
501	}	1106	}
502	else	1107	else
503	evtimer_stop (w); /* nonrepeating: stop timer */	1108	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
504	}
505	}
506		1109
507	static void	1110	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1111	}
		1112	}
		1113
		1114	#if EV_PERIODICS
		1115	inline void
508	periodics_reify ()	1116	periodics_reify (EV_P)
509	{	1117	{
510	while (periodiccnt && periodics [0]->at <= ev_now)	1118	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
511	{	1119	{
512	struct ev_periodic *w = periodics [0];	1120	ev_periodic *w = periodics [0];
		1121
		1122	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
513		1123
514	/* first reschedule or stop timer */	1124	/* first reschedule or stop timer */
515	if (w->interval)	1125	if (w->reschedule_cb)
516	{	1126	{
		1127	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1128	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1129	downheap ((WT *)periodics, periodiccnt, 0);
		1130	}
		1131	else if (w->interval)
		1132	{
517	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1133	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
518	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1134	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
519	downheap ((WT *)periodics, periodiccnt, 0);	1135	downheap ((WT *)periodics, periodiccnt, 0);
520	}	1136	}
521	else	1137	else
522	evperiodic_stop (w); /* nonrepeating: stop timer */	1138	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
523		1139
524	event ((W)w, EV_TIMEOUT);	1140	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
525	}	1141	}
526	}	1142	}
527		1143
528	static void	1144	static void
529	periodics_reschedule (ev_tstamp diff)	1145	periodics_reschedule (EV_P)
530	{	1146	{
531	int i;	1147	int i;
532		1148
533	/* adjust periodics after time jump */	1149	/* adjust periodics after time jump */
534	for (i = 0; i < periodiccnt; ++i)	1150	for (i = 0; i < periodiccnt; ++i)
535	{	1151	{
536	struct ev_periodic *w = periodics [i];	1152	ev_periodic *w = periodics [i];
537		1153
		1154	if (w->reschedule_cb)
		1155	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
538	if (w->interval)	1156	else if (w->interval)
		1157	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1158	}
		1159
		1160	/* now rebuild the heap */
		1161	for (i = periodiccnt >> 1; i--; )
		1162	downheap ((WT *)periodics, periodiccnt, i);
		1163	}
		1164	#endif
		1165
		1166	inline int
		1167	time_update_monotonic (EV_P)
		1168	{
		1169	mn_now = get_clock ();
		1170
		1171	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1172	{
		1173	ev_rt_now = rtmn_diff + mn_now;
		1174	return 0;
		1175	}
		1176	else
		1177	{
		1178	now_floor = mn_now;
		1179	ev_rt_now = ev_time ();
		1180	return 1;
		1181	}
		1182	}
		1183
		1184	inline void
		1185	time_update (EV_P)
		1186	{
		1187	int i;
		1188
		1189	#if EV_USE_MONOTONIC
		1190	if (expect_true (have_monotonic))
		1191	{
		1192	if (time_update_monotonic (EV_A))
539	{	1193	{
540	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1194	ev_tstamp odiff = rtmn_diff;
541		1195
542	if (fabs (diff) >= 1e-4)	1196	/* loop a few times, before making important decisions.
		1197	* on the choice of "4": one iteration isn't enough,
		1198	* in case we get preempted during the calls to
		1199	* ev_time and get_clock. a second call is almost guarenteed
		1200	* to succeed in that case, though. and looping a few more times
		1201	* doesn't hurt either as we only do this on time-jumps or
		1202	* in the unlikely event of getting preempted here.
		1203	*/
		1204	for (i = 4; --i; )
543	{	1205	{
544	evperiodic_stop (w);	1206	rtmn_diff = ev_rt_now - mn_now;
545	evperiodic_start (w);
546		1207
547	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1208	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1209	return; /* all is well */
		1210
		1211	ev_rt_now = ev_time ();
		1212	mn_now = get_clock ();
		1213	now_floor = mn_now;
548	}	1214	}
		1215
		1216	# if EV_PERIODICS
		1217	periodics_reschedule (EV_A);
		1218	# endif
		1219	/* no timer adjustment, as the monotonic clock doesn't jump */
		1220	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
549	}	1221	}
550	}	1222	}
551	}	1223	else
552		1224	#endif
553	static void	1225	{
554	time_update ()
555	{
556	int i;
557
558	ev_now = ev_time ();	1226	ev_rt_now = ev_time ();
559		1227
560	if (have_monotonic)	1228	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
561	{
562	ev_tstamp odiff = diff;
563
564	for (i = 4; --i; ) /* loop a few times, before making important decisions */
565	{	1229	{
566	now = get_clock ();	1230	#if EV_PERIODICS
567	diff = ev_now - now;
568
569	if (fabs (odiff - diff) < MIN_TIMEJUMP)
570	return; /* all is well */
571
572	ev_now = ev_time ();
573	}
574
575	periodics_reschedule (diff - odiff);
576	/* no timer adjustment, as the monotonic clock doesn't jump */
577	}
578	else
579	{
580	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
581	{
582	periodics_reschedule (ev_now - now);	1231	periodics_reschedule (EV_A);
		1232	#endif
583		1233
584	/* adjust timers. this is easy, as the offset is the same for all */	1234	/* adjust timers. this is easy, as the offset is the same for all */
585	for (i = 0; i < timercnt; ++i)	1235	for (i = 0; i < timercnt; ++i)
586	timers [i]->at += diff;	1236	((WT)timers [i])->at += ev_rt_now - mn_now;
587	}	1237	}
588		1238
589	now = ev_now;	1239	mn_now = ev_rt_now;
590	}	1240	}
591	}	1241	}
592		1242
593	int ev_loop_done;	1243	void
		1244	ev_ref (EV_P)
		1245	{
		1246	++activecnt;
		1247	}
594		1248
		1249	void
		1250	ev_unref (EV_P)
		1251	{
		1252	--activecnt;
		1253	}
		1254
		1255	static int loop_done;
		1256
		1257	void
595	void ev_loop (int flags)	1258	ev_loop (EV_P_ int flags)
596	{	1259	{
597	double block;	1260	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
598	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1261	? EVUNLOOP_ONE
		1262	: EVUNLOOP_CANCEL;
599		1263
600	do	1264	while (activecnt)
601	{	1265	{
602	/* queue check watchers (and execute them) */	1266	/* queue check watchers (and execute them) */
603	if (preparecnt)	1267	if (expect_false (preparecnt))
604	{	1268	{
605	queue_events ((W *)prepares, preparecnt, EV_PREPARE);	1269	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
606	call_pending ();	1270	call_pending (EV_A);
607	}	1271	}
608		1272
		1273	/* we might have forked, so reify kernel state if necessary */
		1274	if (expect_false (postfork))
		1275	loop_fork (EV_A);
		1276
609	/* update fd-related kernel structures */	1277	/* update fd-related kernel structures */
610	fd_reify ();	1278	fd_reify (EV_A);
611		1279
612	/* calculate blocking time */	1280	/* calculate blocking time */
		1281	{
		1282	double block;
613		1283
614	/* we only need this for !monotonic clockor timers, but as we basically
615	always have timers, we just calculate it always */
616	ev_now = ev_time ();
617
618	if (flags & EVLOOP_NONBLOCK || idlecnt)	1284	if (flags & EVLOOP_NONBLOCK || idlecnt)
619	block = 0.;	1285	block = 0.; /* do not block at all */
620	else	1286	else
621	{	1287	{
		1288	/* update time to cancel out callback processing overhead */
		1289	#if EV_USE_MONOTONIC
		1290	if (expect_true (have_monotonic))
		1291	time_update_monotonic (EV_A);
		1292	else
		1293	#endif
		1294	{
		1295	ev_rt_now = ev_time ();
		1296	mn_now = ev_rt_now;
		1297	}
		1298
622	block = MAX_BLOCKTIME;	1299	block = MAX_BLOCKTIME;
623		1300
624	if (timercnt)	1301	if (timercnt)
625	{	1302	{
626	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1303	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
627	if (block > to) block = to;	1304	if (block > to) block = to;
628	}	1305	}
629		1306
		1307	#if EV_PERIODICS
630	if (periodiccnt)	1308	if (periodiccnt)
631	{	1309	{
632	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1310	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
633	if (block > to) block = to;	1311	if (block > to) block = to;
634	}	1312	}
		1313	#endif
635		1314
636	if (block < 0.) block = 0.;	1315	if (expect_false (block < 0.)) block = 0.;
637	}	1316	}
638		1317
639	method_poll (block);	1318	backend_poll (EV_A_ block);
		1319	}
640		1320
641	/* update ev_now, do magic */	1321	/* update ev_rt_now, do magic */
642	time_update ();	1322	time_update (EV_A);
643		1323
644	/* queue pending timers and reschedule them */	1324	/* queue pending timers and reschedule them */
645	timers_reify (); /* relative timers called last */	1325	timers_reify (EV_A); /* relative timers called last */
		1326	#if EV_PERIODICS
646	periodics_reify (); /* absolute timers called first */	1327	periodics_reify (EV_A); /* absolute timers called first */
		1328	#endif
647		1329
648	/* queue idle watchers unless io or timers are pending */	1330	/* queue idle watchers unless other events are pending */
649	if (!pendingcnt)	1331	if (idlecnt && !any_pending (EV_A))
650	queue_events ((W *)idles, idlecnt, EV_IDLE);	1332	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
651		1333
652	/* queue check watchers, to be executed first */	1334	/* queue check watchers, to be executed first */
653	if (checkcnt)	1335	if (expect_false (checkcnt))
654	queue_events ((W *)checks, checkcnt, EV_CHECK);	1336	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
655		1337
656	call_pending ();	1338	call_pending (EV_A);
657	}
658	while (!ev_loop_done);
659		1339
660	if (ev_loop_done != 2)	1340	if (expect_false (loop_done))
		1341	break;
		1342	}
		1343
		1344	if (loop_done == EVUNLOOP_ONE)
		1345	loop_done = EVUNLOOP_CANCEL;
		1346	}
		1347
		1348	void
		1349	ev_unloop (EV_P_ int how)
		1350	{
661	ev_loop_done = 0;	1351	loop_done = how;
662	}	1352	}
663		1353
664	/*****************************************************************************/	1354	/*****************************************************************************/
665		1355
666	static void	1356	inline void
667	wlist_add (WL *head, WL elem)	1357	wlist_add (WL *head, WL elem)
668	{	1358	{
669	elem->next = *head;	1359	elem->next = *head;
670	*head = elem;	1360	*head = elem;
671	}	1361	}
672		1362
673	static void	1363	inline void
674	wlist_del (WL *head, WL elem)	1364	wlist_del (WL *head, WL elem)
675	{	1365	{
676	while (*head)	1366	while (*head)
677	{	1367	{
678	if (*head == elem)	1368	if (*head == elem)
…		…
683		1373
684	head = &(*head)->next;	1374	head = &(*head)->next;
685	}	1375	}
686	}	1376	}
687		1377
688	static void	1378	inline void
689	ev_clear (W w)	1379	ev_clear_pending (EV_P_ W w)
690	{	1380	{
691	if (w->pending)	1381	if (w->pending)
692	{	1382	{
693	pendings [w->pending - 1].w = 0;	1383	pendings [ABSPRI (w)][w->pending - 1].w = 0;
694	w->pending = 0;	1384	w->pending = 0;
695	}	1385	}
696	}	1386	}
697		1387
698	static void	1388	inline void
699	ev_start (W w, int active)	1389	ev_start (EV_P_ W w, int active)
700	{	1390	{
		1391	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1392	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1393
701	w->active = active;	1394	w->active = active;
		1395	ev_ref (EV_A);
702	}	1396	}
703		1397
704	static void	1398	inline void
705	ev_stop (W w)	1399	ev_stop (EV_P_ W w)
706	{	1400	{
		1401	ev_unref (EV_A);
707	w->active = 0;	1402	w->active = 0;
708	}	1403	}
709		1404
710	/*****************************************************************************/	1405	/*****************************************************************************/
711		1406
712	void	1407	void
713	evio_start (struct ev_io *w)	1408	ev_io_start (EV_P_ ev_io *w)
714	{	1409	{
715	if (ev_is_active (w))
716	return;
717
718	int fd = w->fd;	1410	int fd = w->fd;
719		1411
		1412	if (expect_false (ev_is_active (w)))
		1413	return;
		1414
		1415	assert (("ev_io_start called with negative fd", fd >= 0));
		1416
720	ev_start ((W)w, 1);	1417	ev_start (EV_A_ (W)w, 1);
721	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1418	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
722	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1419	wlist_add ((WL *)&anfds[fd].head, (WL)w);
723		1420
724	++fdchangecnt;	1421	fd_change (EV_A_ fd);
725	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
726	fdchanges [fdchangecnt - 1] = fd;
727	}	1422	}
728		1423
729	void	1424	void
730	evio_stop (struct ev_io *w)	1425	ev_io_stop (EV_P_ ev_io *w)
731	{	1426	{
732	ev_clear ((W)w);	1427	ev_clear_pending (EV_A_ (W)w);
733	if (!ev_is_active (w))	1428	if (expect_false (!ev_is_active (w)))
734	return;	1429	return;
		1430
		1431	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
735		1432
736	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1433	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
737	ev_stop ((W)w);	1434	ev_stop (EV_A_ (W)w);
738		1435
739	++fdchangecnt;	1436	fd_change (EV_A_ w->fd);
740	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
741	fdchanges [fdchangecnt - 1] = w->fd;
742	}	1437	}
743		1438
744	void	1439	void
745	evtimer_start (struct ev_timer *w)	1440	ev_timer_start (EV_P_ ev_timer *w)
746	{	1441	{
747	if (ev_is_active (w))	1442	if (expect_false (ev_is_active (w)))
748	return;	1443	return;
749		1444
750	w->at += now;	1445	((WT)w)->at += mn_now;
751		1446
752	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1447	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
753		1448
754	ev_start ((W)w, ++timercnt);	1449	ev_start (EV_A_ (W)w, ++timercnt);
755	array_needsize (timers, timermax, timercnt, );	1450	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
756	timers [timercnt - 1] = w;	1451	timers [timercnt - 1] = w;
757	upheap ((WT *)timers, timercnt - 1);	1452	upheap ((WT *)timers, timercnt - 1);
758	}
759		1453
		1454	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1455	}
		1456
760	void	1457	void
761	evtimer_stop (struct ev_timer *w)	1458	ev_timer_stop (EV_P_ ev_timer *w)
762	{	1459	{
763	ev_clear ((W)w);	1460	ev_clear_pending (EV_A_ (W)w);
764	if (!ev_is_active (w))	1461	if (expect_false (!ev_is_active (w)))
765	return;	1462	return;
766		1463
		1464	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1465
767	if (w->active < timercnt--)	1466	if (expect_true (((W)w)->active < timercnt--))
768	{	1467	{
769	timers [w->active - 1] = timers [timercnt];	1468	timers [((W)w)->active - 1] = timers [timercnt];
770	downheap ((WT *)timers, timercnt, w->active - 1);	1469	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
771	}	1470	}
772		1471
773	w->at = w->repeat;	1472	((WT)w)->at -= mn_now;
774		1473
775	ev_stop ((W)w);	1474	ev_stop (EV_A_ (W)w);
776	}	1475	}
777		1476
778	void	1477	void
779	evtimer_again (struct ev_timer *w)	1478	ev_timer_again (EV_P_ ev_timer *w)
780	{	1479	{
781	if (ev_is_active (w))	1480	if (ev_is_active (w))
782	{	1481	{
783	if (w->repeat)	1482	if (w->repeat)
784	{	1483	{
785	w->at = now + w->repeat;	1484	((WT)w)->at = mn_now + w->repeat;
786	downheap ((WT *)timers, timercnt, w->active - 1);	1485	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
787	}	1486	}
788	else	1487	else
789	evtimer_stop (w);	1488	ev_timer_stop (EV_A_ w);
790	}	1489	}
791	else if (w->repeat)	1490	else if (w->repeat)
		1491	{
		1492	w->at = w->repeat;
792	evtimer_start (w);	1493	ev_timer_start (EV_A_ w);
		1494	}
793	}	1495	}
794		1496
		1497	#if EV_PERIODICS
795	void	1498	void
796	evperiodic_start (struct ev_periodic *w)	1499	ev_periodic_start (EV_P_ ev_periodic *w)
797	{	1500	{
798	if (ev_is_active (w))	1501	if (expect_false (ev_is_active (w)))
799	return;	1502	return;
800		1503
801	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1504	if (w->reschedule_cb)
802		1505	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1506	else if (w->interval)
		1507	{
		1508	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
803	/* this formula differs from the one in periodic_reify because we do not always round up */	1509	/* this formula differs from the one in periodic_reify because we do not always round up */
804	if (w->interval)
805	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1510	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1511	}
806		1512
807	ev_start ((W)w, ++periodiccnt);	1513	ev_start (EV_A_ (W)w, ++periodiccnt);
808	array_needsize (periodics, periodicmax, periodiccnt, );	1514	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
809	periodics [periodiccnt - 1] = w;	1515	periodics [periodiccnt - 1] = w;
810	upheap ((WT *)periodics, periodiccnt - 1);	1516	upheap ((WT *)periodics, periodiccnt - 1);
811	}
812		1517
		1518	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1519	}
		1520
813	void	1521	void
814	evperiodic_stop (struct ev_periodic *w)	1522	ev_periodic_stop (EV_P_ ev_periodic *w)
815	{	1523	{
816	ev_clear ((W)w);	1524	ev_clear_pending (EV_A_ (W)w);
817	if (!ev_is_active (w))	1525	if (expect_false (!ev_is_active (w)))
818	return;	1526	return;
819		1527
		1528	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1529
820	if (w->active < periodiccnt--)	1530	if (expect_true (((W)w)->active < periodiccnt--))
821	{	1531	{
822	periodics [w->active - 1] = periodics [periodiccnt];	1532	periodics [((W)w)->active - 1] = periodics [periodiccnt];
823	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1533	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
824	}	1534	}
825		1535
826	ev_stop ((W)w);	1536	ev_stop (EV_A_ (W)w);
827	}	1537	}
828		1538
829	void	1539	void
		1540	ev_periodic_again (EV_P_ ev_periodic *w)
		1541	{
		1542	/* TODO: use adjustheap and recalculation */
		1543	ev_periodic_stop (EV_A_ w);
		1544	ev_periodic_start (EV_A_ w);
		1545	}
		1546	#endif
		1547
		1548	void
		1549	ev_idle_start (EV_P_ ev_idle *w)
		1550	{
		1551	if (expect_false (ev_is_active (w)))
		1552	return;
		1553
		1554	ev_start (EV_A_ (W)w, ++idlecnt);
		1555	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1556	idles [idlecnt - 1] = w;
		1557	}
		1558
		1559	void
		1560	ev_idle_stop (EV_P_ ev_idle *w)
		1561	{
		1562	ev_clear_pending (EV_A_ (W)w);
		1563	if (expect_false (!ev_is_active (w)))
		1564	return;
		1565
		1566	{
		1567	int active = ((W)w)->active;
		1568	idles [active - 1] = idles [--idlecnt];
		1569	((W)idles [active - 1])->active = active;
		1570	}
		1571
		1572	ev_stop (EV_A_ (W)w);
		1573	}
		1574
		1575	void
		1576	ev_prepare_start (EV_P_ ev_prepare *w)
		1577	{
		1578	if (expect_false (ev_is_active (w)))
		1579	return;
		1580
		1581	ev_start (EV_A_ (W)w, ++preparecnt);
		1582	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1583	prepares [preparecnt - 1] = w;
		1584	}
		1585
		1586	void
		1587	ev_prepare_stop (EV_P_ ev_prepare *w)
		1588	{
		1589	ev_clear_pending (EV_A_ (W)w);
		1590	if (expect_false (!ev_is_active (w)))
		1591	return;
		1592
		1593	{
		1594	int active = ((W)w)->active;
		1595	prepares [active - 1] = prepares [--preparecnt];
		1596	((W)prepares [active - 1])->active = active;
		1597	}
		1598
		1599	ev_stop (EV_A_ (W)w);
		1600	}
		1601
		1602	void
		1603	ev_check_start (EV_P_ ev_check *w)
		1604	{
		1605	if (expect_false (ev_is_active (w)))
		1606	return;
		1607
		1608	ev_start (EV_A_ (W)w, ++checkcnt);
		1609	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1610	checks [checkcnt - 1] = w;
		1611	}
		1612
		1613	void
		1614	ev_check_stop (EV_P_ ev_check *w)
		1615	{
		1616	ev_clear_pending (EV_A_ (W)w);
		1617	if (expect_false (!ev_is_active (w)))
		1618	return;
		1619
		1620	{
		1621	int active = ((W)w)->active;
		1622	checks [active - 1] = checks [--checkcnt];
		1623	((W)checks [active - 1])->active = active;
		1624	}
		1625
		1626	ev_stop (EV_A_ (W)w);
		1627	}
		1628
		1629	#ifndef SA_RESTART
		1630	# define SA_RESTART 0
		1631	#endif
		1632
		1633	void
830	evsignal_start (struct ev_signal *w)	1634	ev_signal_start (EV_P_ ev_signal *w)
831	{	1635	{
		1636	#if EV_MULTIPLICITY
		1637	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1638	#endif
832	if (ev_is_active (w))	1639	if (expect_false (ev_is_active (w)))
833	return;	1640	return;
834		1641
		1642	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1643
835	ev_start ((W)w, 1);	1644	ev_start (EV_A_ (W)w, 1);
836	array_needsize (signals, signalmax, w->signum, signals_init);	1645	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
837	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1646	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
838		1647
839	if (!w->next)	1648	if (!((WL)w)->next)
840	{	1649	{
		1650	#if _WIN32
		1651	signal (w->signum, sighandler);
		1652	#else
841	struct sigaction sa;	1653	struct sigaction sa;
842	sa.sa_handler = sighandler;	1654	sa.sa_handler = sighandler;
843	sigfillset (&sa.sa_mask);	1655	sigfillset (&sa.sa_mask);
844	sa.sa_flags = 0;	1656	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
845	sigaction (w->signum, &sa, 0);	1657	sigaction (w->signum, &sa, 0);
		1658	#endif
846	}	1659	}
847	}	1660	}
848		1661
849	void	1662	void
850	evsignal_stop (struct ev_signal *w)	1663	ev_signal_stop (EV_P_ ev_signal *w)
851	{	1664	{
852	ev_clear ((W)w);	1665	ev_clear_pending (EV_A_ (W)w);
853	if (!ev_is_active (w))	1666	if (expect_false (!ev_is_active (w)))
854	return;	1667	return;
855		1668
856	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1669	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
857	ev_stop ((W)w);	1670	ev_stop (EV_A_ (W)w);
858		1671
859	if (!signals [w->signum - 1].head)	1672	if (!signals [w->signum - 1].head)
860	signal (w->signum, SIG_DFL);	1673	signal (w->signum, SIG_DFL);
861	}	1674	}
862		1675
863	void evidle_start (struct ev_idle *w)	1676	void
864	{
865	if (ev_is_active (w))
866	return;
867
868	ev_start ((W)w, ++idlecnt);
869	array_needsize (idles, idlemax, idlecnt, );
870	idles [idlecnt - 1] = w;
871	}
872
873	void evidle_stop (struct ev_idle *w)
874	{
875	ev_clear ((W)w);
876	if (ev_is_active (w))
877	return;
878
879	idles [w->active - 1] = idles [--idlecnt];
880	ev_stop ((W)w);
881	}
882
883	void evprepare_start (struct ev_prepare *w)
884	{
885	if (ev_is_active (w))
886	return;
887
888	ev_start ((W)w, ++preparecnt);
889	array_needsize (prepares, preparemax, preparecnt, );
890	prepares [preparecnt - 1] = w;
891	}
892
893	void evprepare_stop (struct ev_prepare *w)
894	{
895	ev_clear ((W)w);
896	if (ev_is_active (w))
897	return;
898
899	prepares [w->active - 1] = prepares [--preparecnt];
900	ev_stop ((W)w);
901	}
902
903	void evcheck_start (struct ev_check *w)
904	{
905	if (ev_is_active (w))
906	return;
907
908	ev_start ((W)w, ++checkcnt);
909	array_needsize (checks, checkmax, checkcnt, );
910	checks [checkcnt - 1] = w;
911	}
912
913	void evcheck_stop (struct ev_check *w)
914	{
915	ev_clear ((W)w);
916	if (ev_is_active (w))
917	return;
918
919	checks [w->active - 1] = checks [--checkcnt];
920	ev_stop ((W)w);
921	}
922
923	void evchild_start (struct ev_child *w)	1677	ev_child_start (EV_P_ ev_child *w)
924	{	1678	{
		1679	#if EV_MULTIPLICITY
		1680	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1681	#endif
925	if (ev_is_active (w))	1682	if (expect_false (ev_is_active (w)))
926	return;	1683	return;
927		1684
928	ev_start ((W)w, 1);	1685	ev_start (EV_A_ (W)w, 1);
929	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);	1686	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
930	}	1687	}
931		1688
		1689	void
932	void evchild_stop (struct ev_child *w)	1690	ev_child_stop (EV_P_ ev_child *w)
933	{	1691	{
934	ev_clear ((W)w);	1692	ev_clear_pending (EV_A_ (W)w);
935	if (ev_is_active (w))	1693	if (expect_false (!ev_is_active (w)))
936	return;	1694	return;
937		1695
938	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);	1696	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
939	ev_stop ((W)w);	1697	ev_stop (EV_A_ (W)w);
940	}	1698	}
		1699
		1700	#if EV_MULTIPLICITY
		1701	void
		1702	ev_embed_sweep (EV_P_ ev_embed *w)
		1703	{
		1704	ev_loop (w->loop, EVLOOP_NONBLOCK);
		1705	}
		1706
		1707	static void
		1708	embed_cb (EV_P_ ev_io *io, int revents)
		1709	{
		1710	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		1711
		1712	if (ev_cb (w))
		1713	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		1714	else
		1715	ev_embed_sweep (loop, w);
		1716	}
		1717
		1718	void
		1719	ev_embed_start (EV_P_ ev_embed *w)
		1720	{
		1721	if (expect_false (ev_is_active (w)))
		1722	return;
		1723
		1724	{
		1725	struct ev_loop *loop = w->loop;
		1726	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		1727	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		1728	}
		1729
		1730	ev_set_priority (&w->io, ev_priority (w));
		1731	ev_io_start (EV_A_ &w->io);
		1732	ev_start (EV_A_ (W)w, 1);
		1733	}
		1734
		1735	void
		1736	ev_embed_stop (EV_P_ ev_embed *w)
		1737	{
		1738	ev_clear_pending (EV_A_ (W)w);
		1739	if (expect_false (!ev_is_active (w)))
		1740	return;
		1741
		1742	ev_io_stop (EV_A_ &w->io);
		1743	ev_stop (EV_A_ (W)w);
		1744	}
		1745	#endif
941		1746
942	/*****************************************************************************/	1747	/*****************************************************************************/
943		1748
944	struct ev_once	1749	struct ev_once
945	{	1750	{
946	struct ev_io io;	1751	ev_io io;
947	struct ev_timer to;	1752	ev_timer to;
948	void (*cb)(int revents, void *arg);	1753	void (*cb)(int revents, void *arg);
949	void *arg;	1754	void *arg;
950	};	1755	};
951		1756
952	static void	1757	static void
953	once_cb (struct ev_once *once, int revents)	1758	once_cb (EV_P_ struct ev_once *once, int revents)
954	{	1759	{
955	void (*cb)(int revents, void *arg) = once->cb;	1760	void (*cb)(int revents, void *arg) = once->cb;
956	void *arg = once->arg;	1761	void *arg = once->arg;
957		1762
958	evio_stop (&once->io);	1763	ev_io_stop (EV_A_ &once->io);
959	evtimer_stop (&once->to);	1764	ev_timer_stop (EV_A_ &once->to);
960	free (once);	1765	ev_free (once);
961		1766
962	cb (revents, arg);	1767	cb (revents, arg);
963	}	1768	}
964		1769
965	static void	1770	static void
966	once_cb_io (struct ev_io *w, int revents)	1771	once_cb_io (EV_P_ ev_io *w, int revents)
967	{	1772	{
968	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	1773	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
969	}	1774	}
970		1775
971	static void	1776	static void
972	once_cb_to (struct ev_timer *w, int revents)	1777	once_cb_to (EV_P_ ev_timer *w, int revents)
973	{	1778	{
974	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	1779	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
975	}	1780	}
976		1781
977	void	1782	void
978	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	1783	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
979	{	1784	{
980	struct ev_once *once = malloc (sizeof (struct ev_once));	1785	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
981		1786
982	if (!once)	1787	if (expect_false (!once))
983	cb (EV_ERROR, arg);	1788	{
984	else	1789	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1790	return;
985	{	1791	}
		1792
986	once->cb = cb;	1793	once->cb = cb;
987	once->arg = arg;	1794	once->arg = arg;
988		1795
989	evw_init (&once->io, once_cb_io);	1796	ev_init (&once->io, once_cb_io);
990
991	if (fd >= 0)	1797	if (fd >= 0)
992	{	1798	{
993	evio_set (&once->io, fd, events);	1799	ev_io_set (&once->io, fd, events);
994	evio_start (&once->io);	1800	ev_io_start (EV_A_ &once->io);
995	}	1801	}
996		1802
997	evw_init (&once->to, once_cb_to);	1803	ev_init (&once->to, once_cb_to);
998
999	if (timeout >= 0.)	1804	if (timeout >= 0.)
1000	{	1805	{
1001	evtimer_set (&once->to, timeout, 0.);	1806	ev_timer_set (&once->to, timeout, 0.);
1002	evtimer_start (&once->to);	1807	ev_timer_start (EV_A_ &once->to);
1003	}
1004	}
1005	}
1006
1007	/*****************************************************************************/
1008
1009	#if 0
1010
1011	struct ev_io wio;
1012
1013	static void
1014	sin_cb (struct ev_io *w, int revents)
1015	{
1016	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
1017	}
1018
1019	static void
1020	ocb (struct ev_timer *w, int revents)
1021	{
1022	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
1023	evtimer_stop (w);
1024	evtimer_start (w);
1025	}
1026
1027	static void
1028	scb (struct ev_signal *w, int revents)
1029	{
1030	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1031	evio_stop (&wio);
1032	evio_start (&wio);
1033	}
1034
1035	static void
1036	gcb (struct ev_signal *w, int revents)
1037	{
1038	fprintf (stderr, "generic %x\n", revents);
1039
1040	}
1041
1042	int main (void)
1043	{
1044	ev_init (0);
1045
1046	evio_init (&wio, sin_cb, 0, EV_READ);
1047	evio_start (&wio);
1048
1049	struct ev_timer t[10000];
1050
1051	#if 0
1052	int i;
1053	for (i = 0; i < 10000; ++i)
1054	{	1808	}
1055	struct ev_timer *w = t + i;
1056	evw_init (w, ocb, i);
1057	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1058	evtimer_start (w);
1059	if (drand48 () < 0.5)
1060	evtimer_stop (w);
1061	}
1062	#endif
1063
1064	struct ev_timer t1;
1065	evtimer_init (&t1, ocb, 5, 10);
1066	evtimer_start (&t1);
1067
1068	struct ev_signal sig;
1069	evsignal_init (&sig, scb, SIGQUIT);
1070	evsignal_start (&sig);
1071
1072	struct ev_check cw;
1073	evcheck_init (&cw, gcb);
1074	evcheck_start (&cw);
1075
1076	struct ev_idle iw;
1077	evidle_init (&iw, gcb);
1078	evidle_start (&iw);
1079
1080	ev_loop (0);
1081
1082	return 0;
1083	}	1809	}
1084		1810
		1811	#ifdef __cplusplus
		1812	}
1085	#endif	1813	#endif
1086		1814
1087
1088
1089

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