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Comparing libev/ev.c (file contents):
Revision 1.21 by root, Wed Oct 31 18:37:38 2007 UTC vs.
Revision 1.73 by root, Tue Nov 6 16:27:10 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
…		…
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
29		56
30	#include <math.h>	57	#include <math.h>
31	#include <stdlib.h>	58	#include <stdlib.h>
32	#include <unistd.h>
33	#include <fcntl.h>	59	#include <fcntl.h>
34	#include <signal.h>
35	#include <stddef.h>	60	#include <stddef.h>
36		61
37	#include <stdio.h>	62	#include <stdio.h>
38		63
39	#include <assert.h>	64	#include <assert.h>
40	#include <errno.h>	65	#include <errno.h>
41	#include <sys/time.h>	66	#include <sys/types.h>
42	#include <time.h>	67	#include <time.h>
43		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
44	#ifndef HAVE_MONOTONIC	78	#ifndef EV_USE_MONOTONIC
45	# ifdef CLOCK_MONOTONIC
46	# define HAVE_MONOTONIC 1	79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
47	# endif	105	# endif
48	#endif	106	#endif
49		107
50	#ifndef HAVE_SELECT
51	# define HAVE_SELECT 1
52	#endif
53
54	#ifndef HAVE_EPOLL
55	# define HAVE_EPOLL 0
56	#endif
57
58	#ifndef HAVE_REALTIME	108	#ifndef EV_USE_REALTIME
59	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	109	# define EV_USE_REALTIME 1
60	#endif	110	#endif
		111
		112	/**/
		113
		114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
		116	# define EV_USE_MONOTONIC 0
		117	#endif
		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
		121	# define EV_USE_REALTIME 0
		122	#endif
		123
		124	/**/
61		125
62	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
63	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
64		130
65	#include "ev.h"	131	#include "ev.h"
		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
66		146
67	typedef struct ev_watcher *W;	147	typedef struct ev_watcher *W;
68	typedef struct ev_watcher_list *WL;	148	typedef struct ev_watcher_list *WL;
69	typedef struct ev_watcher_time *WT;	149	typedef struct ev_watcher_time *WT;
70		150
71	static ev_tstamp now, diff; /* monotonic clock */	151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
72	ev_tstamp ev_now;
73	int ev_method;
74		152
75	static int have_monotonic; /* runtime */	153	#include "ev_win32.c"
76
77	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
78	static void (*method_modify)(int fd, int oev, int nev);
79	static void (*method_poll)(ev_tstamp timeout);
80		154
81	/*****************************************************************************/	155	/*****************************************************************************/
82		156
83	ev_tstamp	157	static void (*syserr_cb)(const char *msg);
		158
		159	void ev_set_syserr_cb (void (*cb)(const char *msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void *(*alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	# define VAR(name,decl) decl;
		223	# include "ev_vars.h"
		224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
		227
		228	#else
		229
		230	# define VAR(name,decl) static decl;
		231	# include "ev_vars.h"
		232	# undef VAR
		233
		234	#endif
		235
		236	/*****************************************************************************/
		237
		238	inline ev_tstamp
84	ev_time (void)	239	ev_time (void)
85	{	240	{
86	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
87	struct timespec ts;	242	struct timespec ts;
88	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
89	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
90	#else	245	#else
91	struct timeval tv;	246	struct timeval tv;
92	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
93	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
94	#endif	249	#endif
95	}	250	}
96		251
97	static ev_tstamp	252	inline ev_tstamp
98	get_clock (void)	253	get_clock (void)
99	{	254	{
100	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
101	if (have_monotonic)	256	if (expect_true (have_monotonic))
102	{	257	{
103	struct timespec ts;	258	struct timespec ts;
104	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
105	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
106	}	261	}
107	#endif	262	#endif
108		263
109	return ev_time ();	264	return ev_time ();
110	}	265	}
111		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(base,n) ((n) | 4 & ~3)
		274
112	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(base,cur,cnt,init) \
113	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
114	{ \	277	{ \
115	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
		279	do \
		280	{ \
		281	newcnt = array_roundsize (base, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
116	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
117	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
118	cur = newcnt; \	287	cur = newcnt; \
119	}	288	}
		289
		290	#define array_slim(stem) \
		291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		292	{ \
		293	stem ## max = array_roundsize (stem ## cnt >> 1); \
		294	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
		297
		298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		302
		303	#define array_free(stem, idx) \
		304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
120		305
121	/*****************************************************************************/	306	/*****************************************************************************/
122		307
123	typedef struct
124	{
125	struct ev_io *head;
126	unsigned char wev, rev; /* want, received event set */
127	} ANFD;
128
129	static ANFD *anfds;
130	static int anfdmax;
131
132	static int *fdchanges;
133	static int fdchangemax, fdchangecnt;
134
135	static void	308	static void
136	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
137	{	310	{
138	while (count--)	311	while (count--)
139	{	312	{
140	base->head = 0;	313	base->head = 0;
141	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
142	++base;	317	++base;
143	}	318	}
144	}	319	}
145		320
146	typedef struct
147	{
148	W w;
149	int events;
150	} ANPENDING;
151
152	static ANPENDING *pendings;
153	static int pendingmax, pendingcnt;
154
155	static void	321	static void
156	event (W w, int events)	322	event (EV_P_ W w, int events)
157	{	323	{
158	if (w->active)	324	if (w->pending)
159	{	325	{
160	w->pending = ++pendingcnt;
161	array_needsize (pendings, pendingmax, pendingcnt, );
162	pendings [pendingcnt - 1].w = w;
163	pendings [pendingcnt - 1].events = events;	326	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		327	return;
164	}	328	}
165	}
166		329
		330	w->pending = ++pendingcnt [ABSPRI (w)];
		331	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
		332	pendings [ABSPRI (w)][w->pending - 1].w = w;
		333	pendings [ABSPRI (w)][w->pending - 1].events = events;
		334	}
		335
167	static void	336	static void
		337	queue_events (EV_P_ W *events, int eventcnt, int type)
		338	{
		339	int i;
		340
		341	for (i = 0; i < eventcnt; ++i)
		342	event (EV_A_ events [i], type);
		343	}
		344
		345	static void
168	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
169	{	347	{
170	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
171	struct ev_io *w;	349	struct ev_io *w;
172		350
173	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
174	{	352	{
175	int ev = w->events & events;	353	int ev = w->events & events;
176		354
177	if (ev)	355	if (ev)
178	event ((W)w, ev);	356	event (EV_A_ (W)w, ev);
179	}	357	}
180	}	358	}
181		359
		360	/*****************************************************************************/
		361
182	static void	362	static void
183	queue_events (W *events, int eventcnt, int type)	363	fd_reify (EV_P)
184	{	364	{
185	int i;	365	int i;
186		366
187	for (i = 0; i < eventcnt; ++i)	367	for (i = 0; i < fdchangecnt; ++i)
188	event (events [i], type);	368	{
		369	int fd = fdchanges [i];
		370	ANFD *anfd = anfds + fd;
		371	struct ev_io *w;
		372
		373	int events = 0;
		374
		375	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		376	events |= w->events;
		377
		378	anfd->reify = 0;
		379
		380	method_modify (EV_A_ fd, anfd->events, events);
		381	anfd->events = events;
		382	}
		383
		384	fdchangecnt = 0;
		385	}
		386
		387	static void
		388	fd_change (EV_P_ int fd)
		389	{
		390	if (anfds [fd].reify)
		391	return;
		392
		393	anfds [fd].reify = 1;
		394
		395	++fdchangecnt;
		396	array_needsize (fdchanges, fdchangemax, fdchangecnt, (void));
		397	fdchanges [fdchangecnt - 1] = fd;
		398	}
		399
		400	static void
		401	fd_kill (EV_P_ int fd)
		402	{
		403	struct ev_io *w;
		404
		405	while ((w = (struct ev_io *)anfds [fd].head))
		406	{
		407	ev_io_stop (EV_A_ w);
		408	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		409	}
		410	}
		411
		412	static int
		413	fd_valid (int fd)
		414	{
		415	#ifdef WIN32
		416	return !!win32_get_osfhandle (fd);
		417	#else
		418	return fcntl (fd, F_GETFD) != -1;
		419	#endif
189	}	420	}
190		421
191	/* called on EBADF to verify fds */	422	/* called on EBADF to verify fds */
192	static void	423	static void
193	fd_recheck ()	424	fd_ebadf (EV_P)
194	{	425	{
195	int fd;	426	int fd;
196		427
197	for (fd = 0; fd < anfdmax; ++fd)	428	for (fd = 0; fd < anfdmax; ++fd)
198	if (anfds [fd].wev)	429	if (anfds [fd].events)
199	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)	430	if (!fd_valid (fd) == -1 && errno == EBADF)
200	while (anfds [fd].head)	431	fd_kill (EV_A_ fd);
201	evio_stop (anfds [fd].head);	432	}
		433
		434	/* called on ENOMEM in select/poll to kill some fds and retry */
		435	static void
		436	fd_enomem (EV_P)
		437	{
		438	int fd;
		439
		440	for (fd = anfdmax; fd--; )
		441	if (anfds [fd].events)
		442	{
		443	fd_kill (EV_A_ fd);
		444	return;
		445	}
		446	}
		447
		448	/* usually called after fork if method needs to re-arm all fds from scratch */
		449	static void
		450	fd_rearm_all (EV_P)
		451	{
		452	int fd;
		453
		454	/* this should be highly optimised to not do anything but set a flag */
		455	for (fd = 0; fd < anfdmax; ++fd)
		456	if (anfds [fd].events)
		457	{
		458	anfds [fd].events = 0;
		459	fd_change (EV_A_ fd);
		460	}
202	}	461	}
203		462
204	/*****************************************************************************/	463	/*****************************************************************************/
205		464
206	static struct ev_timer **timers;
207	static int timermax, timercnt;
208
209	static struct ev_periodic **periodics;
210	static int periodicmax, periodiccnt;
211
212	static void	465	static void
213	upheap (WT *timers, int k)	466	upheap (WT *heap, int k)
214	{	467	{
215	WT w = timers [k];	468	WT w = heap [k];
216		469
217	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
218	{	471	{
219	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
220	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
221	k >>= 1;	474	k >>= 1;
222	}	475	}
223		476
224	timers [k] = w;	477	heap [k] = w;
225	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
226		479
227	}	480	}
228		481
229	static void	482	static void
230	downheap (WT *timers, int N, int k)	483	downheap (WT *heap, int N, int k)
231	{	484	{
232	WT w = timers [k];	485	WT w = heap [k];
233		486
234	while (k < (N >> 1))	487	while (k < (N >> 1))
235	{	488	{
236	int j = k << 1;	489	int j = k << 1;
237		490
238	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
239	++j;	492	++j;
240		493
241	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
242	break;	495	break;
243		496
244	timers [k] = timers [j];	497	heap [k] = heap [j];
245	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
246	k = j;	499	k = j;
247	}	500	}
248		501
249	timers [k] = w;	502	heap [k] = w;
250	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
251	}	504	}
252		505
253	/*****************************************************************************/	506	/*****************************************************************************/
254		507
255	typedef struct	508	typedef struct
256	{	509	{
257	struct ev_signal *head;	510	WL head;
258	sig_atomic_t gotsig;	511	sig_atomic_t volatile gotsig;
259	} ANSIG;	512	} ANSIG;
260		513
261	static ANSIG *signals;	514	static ANSIG *signals;
262	static int signalmax;	515	static int signalmax;
263		516
264	static int sigpipe [2];	517	static int sigpipe [2];
265	static sig_atomic_t gotsig;	518	static sig_atomic_t volatile gotsig;
266	static struct ev_io sigev;	519	static struct ev_io sigev;
267		520
268	static void	521	static void
269	signals_init (ANSIG *base, int count)	522	signals_init (ANSIG *base, int count)
270	{	523	{
271	while (count--)	524	while (count--)
272	{	525	{
273	base->head = 0;	526	base->head = 0;
274	base->gotsig = 0;	527	base->gotsig = 0;
		528
275	++base;	529	++base;
276	}	530	}
277	}	531	}
278		532
279	static void	533	static void
280	sighandler (int signum)	534	sighandler (int signum)
281	{	535	{
		536	#if WIN32
		537	signal (signum, sighandler);
		538	#endif
		539
282	signals [signum - 1].gotsig = 1;	540	signals [signum - 1].gotsig = 1;
283		541
284	if (!gotsig)	542	if (!gotsig)
285	{	543	{
		544	int old_errno = errno;
286	gotsig = 1;	545	gotsig = 1;
287	write (sigpipe [1], &gotsig, 1);	546	write (sigpipe [1], &signum, 1);
		547	errno = old_errno;
288	}	548	}
289	}	549	}
290		550
291	static void	551	static void
292	sigcb (struct ev_io *iow, int revents)	552	sigcb (EV_P_ struct ev_io *iow, int revents)
293	{	553	{
294	struct ev_signal *w;	554	WL w;
295	int sig;	555	int signum;
296		556
		557	read (sigpipe [0], &revents, 1);
297	gotsig = 0;	558	gotsig = 0;
298	read (sigpipe [0], &revents, 1);
299		559
300	for (sig = signalmax; sig--; )	560	for (signum = signalmax; signum--; )
301	if (signals [sig].gotsig)	561	if (signals [signum].gotsig)
302	{	562	{
303	signals [sig].gotsig = 0;	563	signals [signum].gotsig = 0;
304		564
305	for (w = signals [sig].head; w; w = w->next)	565	for (w = signals [signum].head; w; w = w->next)
306	event ((W)w, EV_SIGNAL);	566	event (EV_A_ (W)w, EV_SIGNAL);
307	}	567	}
308	}	568	}
309		569
310	static void	570	static void
311	siginit (void)	571	siginit (EV_P)
312	{	572	{
		573	#ifndef WIN32
313	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	574	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
314	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	575	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
315		576
316	/* rather than sort out wether we really need nb, set it */	577	/* rather than sort out wether we really need nb, set it */
317	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	578	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
318	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	579	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		580	#endif
319		581
320	evio_set (&sigev, sigpipe [0], EV_READ);	582	ev_io_set (&sigev, sigpipe [0], EV_READ);
321	evio_start (&sigev);	583	ev_io_start (EV_A_ &sigev);
		584	ev_unref (EV_A); /* child watcher should not keep loop alive */
322	}	585	}
323		586
324	/*****************************************************************************/	587	/*****************************************************************************/
325		588
326	static struct ev_idle **idles;	589	static struct ev_child *childs [PID_HASHSIZE];
327	static int idlemax, idlecnt;
328		590
329	static struct ev_prepare **prepares;	591	#ifndef WIN32
330	static int preparemax, preparecnt;
331		592
332	static struct ev_check **checks;	593	static struct ev_signal childev;
333	static int checkmax, checkcnt;	594
		595	#ifndef WCONTINUED
		596	# define WCONTINUED 0
		597	#endif
		598
		599	static void
		600	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		601	{
		602	struct ev_child *w;
		603
		604	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		605	if (w->pid == pid || !w->pid)
		606	{
		607	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		608	w->rpid = pid;
		609	w->rstatus = status;
		610	event (EV_A_ (W)w, EV_CHILD);
		611	}
		612	}
		613
		614	static void
		615	childcb (EV_P_ struct ev_signal *sw, int revents)
		616	{
		617	int pid, status;
		618
		619	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		620	{
		621	/* make sure we are called again until all childs have been reaped */
		622	event (EV_A_ (W)sw, EV_SIGNAL);
		623
		624	child_reap (EV_A_ sw, pid, pid, status);
		625	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		626	}
		627	}
		628
		629	#endif
334		630
335	/*****************************************************************************/	631	/*****************************************************************************/
336		632
		633	#if EV_USE_KQUEUE
		634	# include "ev_kqueue.c"
		635	#endif
337	#if HAVE_EPOLL	636	#if EV_USE_EPOLL
338	# include "ev_epoll.c"	637	# include "ev_epoll.c"
339	#endif	638	#endif
		639	#if EV_USE_POLL
		640	# include "ev_poll.c"
		641	#endif
340	#if HAVE_SELECT	642	#if EV_USE_SELECT
341	# include "ev_select.c"	643	# include "ev_select.c"
342	#endif	644	#endif
343		645
344	int ev_init (int flags)	646	int
		647	ev_version_major (void)
345	{	648	{
		649	return EV_VERSION_MAJOR;
		650	}
		651
		652	int
		653	ev_version_minor (void)
		654	{
		655	return EV_VERSION_MINOR;
		656	}
		657
		658	/* return true if we are running with elevated privileges and should ignore env variables */
		659	static int
		660	enable_secure (void)
		661	{
		662	#ifdef WIN32
		663	return 0;
		664	#else
		665	return getuid () != geteuid ()
		666	|| getgid () != getegid ();
		667	#endif
		668	}
		669
		670	int
		671	ev_method (EV_P)
		672	{
		673	return method;
		674	}
		675
		676	static void
		677	loop_init (EV_P_ int methods)
		678	{
		679	if (!method)
		680	{
346	#if HAVE_MONOTONIC	681	#if EV_USE_MONOTONIC
347	{	682	{
348	struct timespec ts;	683	struct timespec ts;
349	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	684	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
350	have_monotonic = 1;	685	have_monotonic = 1;
351	}	686	}
352	#endif	687	#endif
353		688
354	ev_now = ev_time ();	689	rt_now = ev_time ();
355	now = get_clock ();	690	mn_now = get_clock ();
356	diff = ev_now - now;	691	now_floor = mn_now;
		692	rtmn_diff = rt_now - mn_now;
357		693
		694	if (methods == EVMETHOD_AUTO)
		695	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		696	methods = atoi (getenv ("LIBEV_METHODS"));
		697	else
		698	methods = EVMETHOD_ANY;
		699
		700	method = 0;
		701	#if EV_USE_WIN32
		702	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		703	#endif
		704	#if EV_USE_KQUEUE
		705	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		706	#endif
		707	#if EV_USE_EPOLL
		708	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		709	#endif
		710	#if EV_USE_POLL
		711	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		712	#endif
		713	#if EV_USE_SELECT
		714	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		715	#endif
		716
		717	ev_watcher_init (&sigev, sigcb);
		718	ev_set_priority (&sigev, EV_MAXPRI);
		719	}
		720	}
		721
		722	void
		723	loop_destroy (EV_P)
		724	{
		725	int i;
		726
		727	#if EV_USE_WIN32
		728	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		729	#endif
		730	#if EV_USE_KQUEUE
		731	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		732	#endif
		733	#if EV_USE_EPOLL
		734	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		735	#endif
		736	#if EV_USE_POLL
		737	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		738	#endif
		739	#if EV_USE_SELECT
		740	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		741	#endif
		742
		743	for (i = NUMPRI; i--; )
		744	array_free (pending, [i]);
		745
		746	/* have to use the microsoft-never-gets-it-right macro */
		747	array_free_microshit (fdchange);
		748	array_free_microshit (timer);
		749	array_free_microshit (periodic);
		750	array_free_microshit (idle);
		751	array_free_microshit (prepare);
		752	array_free_microshit (check);
		753
		754	method = 0;
		755	}
		756
		757	static void
		758	loop_fork (EV_P)
		759	{
		760	#if EV_USE_EPOLL
		761	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		762	#endif
		763	#if EV_USE_KQUEUE
		764	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		765	#endif
		766
		767	if (ev_is_active (&sigev))
		768	{
		769	/* default loop */
		770
		771	ev_ref (EV_A);
		772	ev_io_stop (EV_A_ &sigev);
		773	close (sigpipe [0]);
		774	close (sigpipe [1]);
		775
		776	while (pipe (sigpipe))
		777	syserr ("(libev) error creating pipe");
		778
		779	siginit (EV_A);
		780	}
		781
		782	postfork = 0;
		783	}
		784
		785	#if EV_MULTIPLICITY
		786	struct ev_loop *
		787	ev_loop_new (int methods)
		788	{
		789	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		790
		791	memset (loop, 0, sizeof (struct ev_loop));
		792
		793	loop_init (EV_A_ methods);
		794
		795	if (ev_method (EV_A))
		796	return loop;
		797
		798	return 0;
		799	}
		800
		801	void
		802	ev_loop_destroy (EV_P)
		803	{
		804	loop_destroy (EV_A);
		805	ev_free (loop);
		806	}
		807
		808	void
		809	ev_loop_fork (EV_P)
		810	{
		811	postfork = 1;
		812	}
		813
		814	#endif
		815
		816	#if EV_MULTIPLICITY
		817	struct ev_loop default_loop_struct;
		818	static struct ev_loop *default_loop;
		819
		820	struct ev_loop *
		821	#else
		822	static int default_loop;
		823
		824	int
		825	#endif
		826	ev_default_loop (int methods)
		827	{
		828	if (sigpipe [0] == sigpipe [1])
358	if (pipe (sigpipe))	829	if (pipe (sigpipe))
359	return 0;	830	return 0;
360		831
361	ev_method = EVMETHOD_NONE;	832	if (!default_loop)
362	#if HAVE_EPOLL	833	{
363	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	834	#if EV_MULTIPLICITY
		835	struct ev_loop *loop = default_loop = &default_loop_struct;
		836	#else
		837	default_loop = 1;
364	#endif	838	#endif
365	#if HAVE_SELECT
366	if (ev_method == EVMETHOD_NONE) select_init (flags);
367	#endif
368		839
		840	loop_init (EV_A_ methods);
		841
		842	if (ev_method (EV_A))
		843	{
		844	siginit (EV_A);
		845
		846	#ifndef WIN32
		847	ev_signal_init (&childev, childcb, SIGCHLD);
		848	ev_set_priority (&childev, EV_MAXPRI);
		849	ev_signal_start (EV_A_ &childev);
		850	ev_unref (EV_A); /* child watcher should not keep loop alive */
		851	#endif
		852	}
		853	else
		854	default_loop = 0;
		855	}
		856
		857	return default_loop;
		858	}
		859
		860	void
		861	ev_default_destroy (void)
		862	{
		863	#if EV_MULTIPLICITY
		864	struct ev_loop *loop = default_loop;
		865	#endif
		866
		867	#ifndef WIN32
		868	ev_ref (EV_A); /* child watcher */
		869	ev_signal_stop (EV_A_ &childev);
		870	#endif
		871
		872	ev_ref (EV_A); /* signal watcher */
		873	ev_io_stop (EV_A_ &sigev);
		874
		875	close (sigpipe [0]); sigpipe [0] = 0;
		876	close (sigpipe [1]); sigpipe [1] = 0;
		877
		878	loop_destroy (EV_A);
		879	}
		880
		881	void
		882	ev_default_fork (void)
		883	{
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *loop = default_loop;
		886	#endif
		887
369	if (ev_method)	888	if (method)
370	{	889	postfork = 1;
371	evw_init (&sigev, sigcb);
372	siginit ();
373	}
374
375	return ev_method;
376	}	890	}
377		891
378	/*****************************************************************************/	892	/*****************************************************************************/
379		893
380	void ev_prefork (void)
381	{
382	/* nop */
383	}
384
385	void ev_postfork_parent (void)
386	{
387	/* nop */
388	}
389
390	void ev_postfork_child (void)
391	{
392	#if HAVE_EPOLL
393	if (ev_method == EVMETHOD_EPOLL)
394	epoll_postfork_child ();
395	#endif
396
397	evio_stop (&sigev);
398	close (sigpipe [0]);
399	close (sigpipe [1]);
400	pipe (sigpipe);
401	siginit ();
402	}
403
404	/*****************************************************************************/
405
406	static void	894	static void
407	fd_reify (void)	895	call_pending (EV_P)
408	{	896	{
409	int i;	897	int pri;
410		898
411	for (i = 0; i < fdchangecnt; ++i)	899	for (pri = NUMPRI; pri--; )
412	{	900	while (pendingcnt [pri])
413	int fd = fdchanges [i];
414	ANFD *anfd = anfds + fd;
415	struct ev_io *w;
416
417	int wev = 0;
418
419	for (w = anfd->head; w; w = w->next)
420	wev |= w->events;
421
422	if (anfd->wev != wev)
423	{	901	{
424	method_modify (fd, anfd->wev, wev);
425	anfd->wev = wev;
426	}
427	}
428
429	fdchangecnt = 0;
430	}
431
432	static void
433	call_pending ()
434	{
435	while (pendingcnt)
436	{
437	ANPENDING *p = pendings + --pendingcnt;	902	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
438		903
439	if (p->w)	904	if (p->w)
440	{	905	{
441	p->w->pending = 0;	906	p->w->pending = 0;
442	p->w->cb (p->w, p->events);	907	p->w->cb (EV_A_ p->w, p->events);
443	}	908	}
444	}	909	}
445	}	910	}
446		911
447	static void	912	static void
448	timers_reify ()	913	timers_reify (EV_P)
449	{	914	{
450	while (timercnt && timers [0]->at <= now)	915	while (timercnt && ((WT)timers [0])->at <= mn_now)
451	{	916	{
452	struct ev_timer *w = timers [0];	917	struct ev_timer *w = timers [0];
453		918
454	event ((W)w, EV_TIMEOUT);	919	assert (("inactive timer on timer heap detected", ev_is_active (w)));
455		920
456	/* first reschedule or stop timer */	921	/* first reschedule or stop timer */
457	if (w->repeat)	922	if (w->repeat)
458	{	923	{
		924	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
459	w->at = now + w->repeat;	925	((WT)w)->at = mn_now + w->repeat;
460	assert (("timer timeout in the past, negative repeat?", w->at > now));
461	downheap ((WT *)timers, timercnt, 0);	926	downheap ((WT *)timers, timercnt, 0);
462	}	927	}
463	else	928	else
464	evtimer_stop (w); /* nonrepeating: stop timer */	929	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
465	}
466	}
467		930
		931	event (EV_A_ (W)w, EV_TIMEOUT);
		932	}
		933	}
		934
468	static void	935	static void
469	periodics_reify ()	936	periodics_reify (EV_P)
470	{	937	{
471	while (periodiccnt && periodics [0]->at <= ev_now)	938	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
472	{	939	{
473	struct ev_periodic *w = periodics [0];	940	struct ev_periodic *w = periodics [0];
		941
		942	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
474		943
475	/* first reschedule or stop timer */	944	/* first reschedule or stop timer */
476	if (w->interval)	945	if (w->interval)
477	{	946	{
478	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	947	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
479	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	948	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
480	downheap ((WT *)periodics, periodiccnt, 0);	949	downheap ((WT *)periodics, periodiccnt, 0);
481	}	950	}
482	else	951	else
483	evperiodic_stop (w); /* nonrepeating: stop timer */	952	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
484		953
485	event ((W)w, EV_TIMEOUT);	954	event (EV_A_ (W)w, EV_PERIODIC);
486	}	955	}
487	}	956	}
488		957
489	static void	958	static void
490	periodics_reschedule (ev_tstamp diff)	959	periodics_reschedule (EV_P)
491	{	960	{
492	int i;	961	int i;
493		962
494	/* adjust periodics after time jump */	963	/* adjust periodics after time jump */
495	for (i = 0; i < periodiccnt; ++i)	964	for (i = 0; i < periodiccnt; ++i)
496	{	965	{
497	struct ev_periodic *w = periodics [i];	966	struct ev_periodic *w = periodics [i];
498		967
499	if (w->interval)	968	if (w->interval)
500	{	969	{
501	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	970	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
502		971
503	if (fabs (diff) >= 1e-4)	972	if (fabs (diff) >= 1e-4)
504	{	973	{
505	evperiodic_stop (w);	974	ev_periodic_stop (EV_A_ w);
506	evperiodic_start (w);	975	ev_periodic_start (EV_A_ w);
507		976
508	i = 0; /* restart loop, inefficient, but time jumps should be rare */	977	i = 0; /* restart loop, inefficient, but time jumps should be rare */
509	}	978	}
510	}	979	}
511	}	980	}
512	}	981	}
513		982
		983	inline int
		984	time_update_monotonic (EV_P)
		985	{
		986	mn_now = get_clock ();
		987
		988	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		989	{
		990	rt_now = rtmn_diff + mn_now;
		991	return 0;
		992	}
		993	else
		994	{
		995	now_floor = mn_now;
		996	rt_now = ev_time ();
		997	return 1;
		998	}
		999	}
		1000
514	static void	1001	static void
515	time_update ()	1002	time_update (EV_P)
516	{	1003	{
517	int i;	1004	int i;
518		1005
519	ev_now = ev_time ();	1006	#if EV_USE_MONOTONIC
520
521	if (have_monotonic)	1007	if (expect_true (have_monotonic))
522	{	1008	{
523	ev_tstamp odiff = diff;	1009	if (time_update_monotonic (EV_A))
524
525	for (i = 4; --i; ) /* loop a few times, before making important decisions */
526	{	1010	{
527	now = get_clock ();	1011	ev_tstamp odiff = rtmn_diff;
		1012
		1013	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1014	{
528	diff = ev_now - now;	1015	rtmn_diff = rt_now - mn_now;
529		1016
530	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1017	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
531	return; /* all is well */	1018	return; /* all is well */
532		1019
533	ev_now = ev_time ();	1020	rt_now = ev_time ();
		1021	mn_now = get_clock ();
		1022	now_floor = mn_now;
		1023	}
		1024
		1025	periodics_reschedule (EV_A);
		1026	/* no timer adjustment, as the monotonic clock doesn't jump */
		1027	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
534	}	1028	}
535
536	periodics_reschedule (diff - odiff);
537	/* no timer adjustment, as the monotonic clock doesn't jump */
538	}	1029	}
539	else	1030	else
		1031	#endif
540	{	1032	{
541	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1033	rt_now = ev_time ();
		1034
		1035	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
542	{	1036	{
543	periodics_reschedule (ev_now - now);	1037	periodics_reschedule (EV_A);
544		1038
545	/* adjust timers. this is easy, as the offset is the same for all */	1039	/* adjust timers. this is easy, as the offset is the same for all */
546	for (i = 0; i < timercnt; ++i)	1040	for (i = 0; i < timercnt; ++i)
547	timers [i]->at += diff;	1041	((WT)timers [i])->at += rt_now - mn_now;
548	}	1042	}
549		1043
550	now = ev_now;	1044	mn_now = rt_now;
551	}	1045	}
552	}	1046	}
553		1047
554	int ev_loop_done;	1048	void
		1049	ev_ref (EV_P)
		1050	{
		1051	++activecnt;
		1052	}
555		1053
		1054	void
		1055	ev_unref (EV_P)
		1056	{
		1057	--activecnt;
		1058	}
		1059
		1060	static int loop_done;
		1061
		1062	void
556	void ev_loop (int flags)	1063	ev_loop (EV_P_ int flags)
557	{	1064	{
558	double block;	1065	double block;
559	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1066	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
560		1067
561	do	1068	do
562	{	1069	{
563	/* queue check watchers (and execute them) */	1070	/* queue check watchers (and execute them) */
564	if (preparecnt)	1071	if (expect_false (preparecnt))
565	{	1072	{
566	queue_events ((W *)prepares, preparecnt, EV_PREPARE);	1073	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
567	call_pending ();	1074	call_pending (EV_A);
568	}	1075	}
569		1076
		1077	/* we might have forked, so reify kernel state if necessary */
		1078	if (expect_false (postfork))
		1079	loop_fork (EV_A);
		1080
570	/* update fd-related kernel structures */	1081	/* update fd-related kernel structures */
571	fd_reify ();	1082	fd_reify (EV_A);
572		1083
573	/* calculate blocking time */	1084	/* calculate blocking time */
574		1085
575	/* we only need this for !monotonic clockor timers, but as we basically	1086	/* we only need this for !monotonic clockor timers, but as we basically
576	always have timers, we just calculate it always */	1087	always have timers, we just calculate it always */
		1088	#if EV_USE_MONOTONIC
		1089	if (expect_true (have_monotonic))
		1090	time_update_monotonic (EV_A);
		1091	else
		1092	#endif
		1093	{
577	ev_now = ev_time ();	1094	rt_now = ev_time ();
		1095	mn_now = rt_now;
		1096	}
578		1097
579	if (flags & EVLOOP_NONBLOCK || idlecnt)	1098	if (flags & EVLOOP_NONBLOCK || idlecnt)
580	block = 0.;	1099	block = 0.;
581	else	1100	else
582	{	1101	{
583	block = MAX_BLOCKTIME;	1102	block = MAX_BLOCKTIME;
584		1103
585	if (timercnt)	1104	if (timercnt)
586	{	1105	{
587	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1106	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
588	if (block > to) block = to;	1107	if (block > to) block = to;
589	}	1108	}
590		1109
591	if (periodiccnt)	1110	if (periodiccnt)
592	{	1111	{
593	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1112	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
594	if (block > to) block = to;	1113	if (block > to) block = to;
595	}	1114	}
596		1115
597	if (block < 0.) block = 0.;	1116	if (block < 0.) block = 0.;
598	}	1117	}
599		1118
600	method_poll (block);	1119	method_poll (EV_A_ block);
601		1120
602	/* update ev_now, do magic */	1121	/* update rt_now, do magic */
603	time_update ();	1122	time_update (EV_A);
604		1123
605	/* queue pending timers and reschedule them */	1124	/* queue pending timers and reschedule them */
606	timers_reify (); /* relative timers called last */	1125	timers_reify (EV_A); /* relative timers called last */
607	periodics_reify (); /* absolute timers called first */	1126	periodics_reify (EV_A); /* absolute timers called first */
608		1127
609	/* queue idle watchers unless io or timers are pending */	1128	/* queue idle watchers unless io or timers are pending */
610	if (!pendingcnt)	1129	if (!pendingcnt)
611	queue_events ((W *)idles, idlecnt, EV_IDLE);	1130	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
612		1131
613	/* queue check watchers, to be executed first */	1132	/* queue check watchers, to be executed first */
614	if (checkcnt)	1133	if (checkcnt)
615	queue_events ((W *)checks, checkcnt, EV_CHECK);	1134	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
616		1135
617	call_pending ();	1136	call_pending (EV_A);
618	}	1137	}
619	while (!ev_loop_done);	1138	while (activecnt && !loop_done);
620		1139
621	if (ev_loop_done != 2)	1140	if (loop_done != 2)
622	ev_loop_done = 0;	1141	loop_done = 0;
		1142	}
		1143
		1144	void
		1145	ev_unloop (EV_P_ int how)
		1146	{
		1147	loop_done = how;
623	}	1148	}
624		1149
625	/*****************************************************************************/	1150	/*****************************************************************************/
626		1151
627	static void	1152	inline void
628	wlist_add (WL *head, WL elem)	1153	wlist_add (WL *head, WL elem)
629	{	1154	{
630	elem->next = *head;	1155	elem->next = *head;
631	*head = elem;	1156	*head = elem;
632	}	1157	}
633		1158
634	static void	1159	inline void
635	wlist_del (WL *head, WL elem)	1160	wlist_del (WL *head, WL elem)
636	{	1161	{
637	while (*head)	1162	while (*head)
638	{	1163	{
639	if (*head == elem)	1164	if (*head == elem)
…		…
644		1169
645	head = &(*head)->next;	1170	head = &(*head)->next;
646	}	1171	}
647	}	1172	}
648		1173
649	static void	1174	inline void
650	ev_clear (W w)	1175	ev_clear_pending (EV_P_ W w)
651	{	1176	{
652	if (w->pending)	1177	if (w->pending)
653	{	1178	{
654	pendings [w->pending - 1].w = 0;	1179	pendings [ABSPRI (w)][w->pending - 1].w = 0;
655	w->pending = 0;	1180	w->pending = 0;
656	}	1181	}
657	}	1182	}
658		1183
659	static void	1184	inline void
660	ev_start (W w, int active)	1185	ev_start (EV_P_ W w, int active)
661	{	1186	{
		1187	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1188	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1189
662	w->active = active;	1190	w->active = active;
		1191	ev_ref (EV_A);
663	}	1192	}
664		1193
665	static void	1194	inline void
666	ev_stop (W w)	1195	ev_stop (EV_P_ W w)
667	{	1196	{
		1197	ev_unref (EV_A);
668	w->active = 0;	1198	w->active = 0;
669	}	1199	}
670		1200
671	/*****************************************************************************/	1201	/*****************************************************************************/
672		1202
673	void	1203	void
674	evio_start (struct ev_io *w)	1204	ev_io_start (EV_P_ struct ev_io *w)
675	{	1205	{
		1206	int fd = w->fd;
		1207
676	if (ev_is_active (w))	1208	if (ev_is_active (w))
677	return;	1209	return;
678		1210
679	int fd = w->fd;	1211	assert (("ev_io_start called with negative fd", fd >= 0));
680		1212
681	ev_start ((W)w, 1);	1213	ev_start (EV_A_ (W)w, 1);
682	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1214	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
683	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1215	wlist_add ((WL *)&anfds[fd].head, (WL)w);
684		1216
685	++fdchangecnt;	1217	fd_change (EV_A_ fd);
686	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
687	fdchanges [fdchangecnt - 1] = fd;
688	}	1218	}
689		1219
690	void	1220	void
691	evio_stop (struct ev_io *w)	1221	ev_io_stop (EV_P_ struct ev_io *w)
692	{	1222	{
693	ev_clear ((W)w);	1223	ev_clear_pending (EV_A_ (W)w);
694	if (!ev_is_active (w))	1224	if (!ev_is_active (w))
695	return;	1225	return;
696		1226
697	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1227	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
698	ev_stop ((W)w);	1228	ev_stop (EV_A_ (W)w);
699		1229
700	++fdchangecnt;	1230	fd_change (EV_A_ w->fd);
701	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
702	fdchanges [fdchangecnt - 1] = w->fd;
703	}	1231	}
704		1232
705	void	1233	void
706	evtimer_start (struct ev_timer *w)	1234	ev_timer_start (EV_P_ struct ev_timer *w)
707	{	1235	{
708	if (ev_is_active (w))	1236	if (ev_is_active (w))
709	return;	1237	return;
710		1238
711	w->at += now;	1239	((WT)w)->at += mn_now;
712		1240
713	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1241	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
714		1242
715	ev_start ((W)w, ++timercnt);	1243	ev_start (EV_A_ (W)w, ++timercnt);
716	array_needsize (timers, timermax, timercnt, );	1244	array_needsize (timers, timermax, timercnt, (void));
717	timers [timercnt - 1] = w;	1245	timers [timercnt - 1] = w;
718	upheap ((WT *)timers, timercnt - 1);	1246	upheap ((WT *)timers, timercnt - 1);
719	}
720		1247
		1248	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1249	}
		1250
721	void	1251	void
722	evtimer_stop (struct ev_timer *w)	1252	ev_timer_stop (EV_P_ struct ev_timer *w)
723	{	1253	{
724	ev_clear ((W)w);	1254	ev_clear_pending (EV_A_ (W)w);
725	if (!ev_is_active (w))	1255	if (!ev_is_active (w))
726	return;	1256	return;
727		1257
		1258	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1259
728	if (w->active < timercnt--)	1260	if (((W)w)->active < timercnt--)
729	{	1261	{
730	timers [w->active - 1] = timers [timercnt];	1262	timers [((W)w)->active - 1] = timers [timercnt];
731	downheap ((WT *)timers, timercnt, w->active - 1);	1263	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
732	}	1264	}
733		1265
734	w->at = w->repeat;	1266	((WT)w)->at = w->repeat;
735		1267
736	ev_stop ((W)w);	1268	ev_stop (EV_A_ (W)w);
737	}	1269	}
738		1270
739	void	1271	void
740	evtimer_again (struct ev_timer *w)	1272	ev_timer_again (EV_P_ struct ev_timer *w)
741	{	1273	{
742	if (ev_is_active (w))	1274	if (ev_is_active (w))
743	{	1275	{
744	if (w->repeat)	1276	if (w->repeat)
745	{	1277	{
746	w->at = now + w->repeat;	1278	((WT)w)->at = mn_now + w->repeat;
747	downheap ((WT *)timers, timercnt, w->active - 1);	1279	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
748	}	1280	}
749	else	1281	else
750	evtimer_stop (w);	1282	ev_timer_stop (EV_A_ w);
751	}	1283	}
752	else if (w->repeat)	1284	else if (w->repeat)
753	evtimer_start (w);	1285	ev_timer_start (EV_A_ w);
754	}	1286	}
755		1287
756	void	1288	void
757	evperiodic_start (struct ev_periodic *w)	1289	ev_periodic_start (EV_P_ struct ev_periodic *w)
758	{	1290	{
759	if (ev_is_active (w))	1291	if (ev_is_active (w))
760	return;	1292	return;
761		1293
762	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1294	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
763		1295
764	/* this formula differs from the one in periodic_reify because we do not always round up */	1296	/* this formula differs from the one in periodic_reify because we do not always round up */
765	if (w->interval)	1297	if (w->interval)
766	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1298	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
767		1299
768	ev_start ((W)w, ++periodiccnt);	1300	ev_start (EV_A_ (W)w, ++periodiccnt);
769	array_needsize (periodics, periodicmax, periodiccnt, );	1301	array_needsize (periodics, periodicmax, periodiccnt, (void));
770	periodics [periodiccnt - 1] = w;	1302	periodics [periodiccnt - 1] = w;
771	upheap ((WT *)periodics, periodiccnt - 1);	1303	upheap ((WT *)periodics, periodiccnt - 1);
772	}
773		1304
		1305	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1306	}
		1307
774	void	1308	void
775	evperiodic_stop (struct ev_periodic *w)	1309	ev_periodic_stop (EV_P_ struct ev_periodic *w)
776	{	1310	{
777	ev_clear ((W)w);	1311	ev_clear_pending (EV_A_ (W)w);
778	if (!ev_is_active (w))	1312	if (!ev_is_active (w))
779	return;	1313	return;
780		1314
		1315	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1316
781	if (w->active < periodiccnt--)	1317	if (((W)w)->active < periodiccnt--)
782	{	1318	{
783	periodics [w->active - 1] = periodics [periodiccnt];	1319	periodics [((W)w)->active - 1] = periodics [periodiccnt];
784	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1320	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
785	}	1321	}
786		1322
787	ev_stop ((W)w);	1323	ev_stop (EV_A_ (W)w);
788	}	1324	}
789		1325
790	void	1326	void
791	evsignal_start (struct ev_signal *w)	1327	ev_idle_start (EV_P_ struct ev_idle *w)
792	{	1328	{
793	if (ev_is_active (w))	1329	if (ev_is_active (w))
794	return;	1330	return;
795		1331
		1332	ev_start (EV_A_ (W)w, ++idlecnt);
		1333	array_needsize (idles, idlemax, idlecnt, (void));
		1334	idles [idlecnt - 1] = w;
		1335	}
		1336
		1337	void
		1338	ev_idle_stop (EV_P_ struct ev_idle *w)
		1339	{
		1340	ev_clear_pending (EV_A_ (W)w);
		1341	if (ev_is_active (w))
		1342	return;
		1343
		1344	idles [((W)w)->active - 1] = idles [--idlecnt];
		1345	ev_stop (EV_A_ (W)w);
		1346	}
		1347
		1348	void
		1349	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1350	{
		1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	ev_start (EV_A_ (W)w, ++preparecnt);
		1355	array_needsize (prepares, preparemax, preparecnt, (void));
		1356	prepares [preparecnt - 1] = w;
		1357	}
		1358
		1359	void
		1360	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1361	{
		1362	ev_clear_pending (EV_A_ (W)w);
		1363	if (ev_is_active (w))
		1364	return;
		1365
		1366	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1367	ev_stop (EV_A_ (W)w);
		1368	}
		1369
		1370	void
		1371	ev_check_start (EV_P_ struct ev_check *w)
		1372	{
		1373	if (ev_is_active (w))
		1374	return;
		1375
		1376	ev_start (EV_A_ (W)w, ++checkcnt);
		1377	array_needsize (checks, checkmax, checkcnt, (void));
		1378	checks [checkcnt - 1] = w;
		1379	}
		1380
		1381	void
		1382	ev_check_stop (EV_P_ struct ev_check *w)
		1383	{
		1384	ev_clear_pending (EV_A_ (W)w);
		1385	if (ev_is_active (w))
		1386	return;
		1387
		1388	checks [((W)w)->active - 1] = checks [--checkcnt];
		1389	ev_stop (EV_A_ (W)w);
		1390	}
		1391
		1392	#ifndef SA_RESTART
		1393	# define SA_RESTART 0
		1394	#endif
		1395
		1396	void
		1397	ev_signal_start (EV_P_ struct ev_signal *w)
		1398	{
		1399	#if EV_MULTIPLICITY
		1400	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1401	#endif
		1402	if (ev_is_active (w))
		1403	return;
		1404
		1405	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1406
796	ev_start ((W)w, 1);	1407	ev_start (EV_A_ (W)w, 1);
797	array_needsize (signals, signalmax, w->signum, signals_init);	1408	array_needsize (signals, signalmax, w->signum, signals_init);
798	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1409	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
799		1410
800	if (!w->next)	1411	if (!((WL)w)->next)
801	{	1412	{
		1413	#if WIN32
		1414	signal (w->signum, sighandler);
		1415	#else
802	struct sigaction sa;	1416	struct sigaction sa;
803	sa.sa_handler = sighandler;	1417	sa.sa_handler = sighandler;
804	sigfillset (&sa.sa_mask);	1418	sigfillset (&sa.sa_mask);
805	sa.sa_flags = 0;	1419	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
806	sigaction (w->signum, &sa, 0);	1420	sigaction (w->signum, &sa, 0);
		1421	#endif
807	}	1422	}
808	}	1423	}
809		1424
810	void	1425	void
811	evsignal_stop (struct ev_signal *w)	1426	ev_signal_stop (EV_P_ struct ev_signal *w)
812	{	1427	{
813	ev_clear ((W)w);	1428	ev_clear_pending (EV_A_ (W)w);
814	if (!ev_is_active (w))	1429	if (!ev_is_active (w))
815	return;	1430	return;
816		1431
817	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1432	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
818	ev_stop ((W)w);	1433	ev_stop (EV_A_ (W)w);
819		1434
820	if (!signals [w->signum - 1].head)	1435	if (!signals [w->signum - 1].head)
821	signal (w->signum, SIG_DFL);	1436	signal (w->signum, SIG_DFL);
822	}	1437	}
823		1438
824	void evidle_start (struct ev_idle *w)	1439	void
		1440	ev_child_start (EV_P_ struct ev_child *w)
825	{	1441	{
		1442	#if EV_MULTIPLICITY
		1443	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1444	#endif
826	if (ev_is_active (w))	1445	if (ev_is_active (w))
827	return;	1446	return;
828		1447
829	ev_start ((W)w, ++idlecnt);	1448	ev_start (EV_A_ (W)w, 1);
830	array_needsize (idles, idlemax, idlecnt, );	1449	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
831	idles [idlecnt - 1] = w;
832	}	1450	}
833		1451
834	void evidle_stop (struct ev_idle *w)	1452	void
		1453	ev_child_stop (EV_P_ struct ev_child *w)
835	{	1454	{
836	ev_clear ((W)w);	1455	ev_clear_pending (EV_A_ (W)w);
837	if (ev_is_active (w))	1456	if (ev_is_active (w))
838	return;	1457	return;
839		1458
840	idles [w->active - 1] = idles [--idlecnt];	1459	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
841	ev_stop ((W)w);	1460	ev_stop (EV_A_ (W)w);
842	}
843
844	void evprepare_start (struct ev_prepare *w)
845	{
846	if (ev_is_active (w))
847	return;
848
849	ev_start ((W)w, ++preparecnt);
850	array_needsize (prepares, preparemax, preparecnt, );
851	prepares [preparecnt - 1] = w;
852	}
853
854	void evprepare_stop (struct ev_prepare *w)
855	{
856	ev_clear ((W)w);
857	if (ev_is_active (w))
858	return;
859
860	prepares [w->active - 1] = prepares [--preparecnt];
861	ev_stop ((W)w);
862	}
863
864	void evcheck_start (struct ev_check *w)
865	{
866	if (ev_is_active (w))
867	return;
868
869	ev_start ((W)w, ++checkcnt);
870	array_needsize (checks, checkmax, checkcnt, );
871	checks [checkcnt - 1] = w;
872	}
873
874	void evcheck_stop (struct ev_check *w)
875	{
876	ev_clear ((W)w);
877	if (ev_is_active (w))
878	return;
879
880	checks [w->active - 1] = checks [--checkcnt];
881	ev_stop ((W)w);
882	}	1461	}
883		1462
884	/*****************************************************************************/	1463	/*****************************************************************************/
885		1464
886	struct ev_once	1465	struct ev_once
…		…
890	void (*cb)(int revents, void *arg);	1469	void (*cb)(int revents, void *arg);
891	void *arg;	1470	void *arg;
892	};	1471	};
893		1472
894	static void	1473	static void
895	once_cb (struct ev_once *once, int revents)	1474	once_cb (EV_P_ struct ev_once *once, int revents)
896	{	1475	{
897	void (*cb)(int revents, void *arg) = once->cb;	1476	void (*cb)(int revents, void *arg) = once->cb;
898	void *arg = once->arg;	1477	void *arg = once->arg;
899		1478
900	evio_stop (&once->io);	1479	ev_io_stop (EV_A_ &once->io);
901	evtimer_stop (&once->to);	1480	ev_timer_stop (EV_A_ &once->to);
902	free (once);	1481	ev_free (once);
903		1482
904	cb (revents, arg);	1483	cb (revents, arg);
905	}	1484	}
906		1485
907	static void	1486	static void
908	once_cb_io (struct ev_io *w, int revents)	1487	once_cb_io (EV_P_ struct ev_io *w, int revents)
909	{	1488	{
910	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	1489	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
911	}	1490	}
912		1491
913	static void	1492	static void
914	once_cb_to (struct ev_timer *w, int revents)	1493	once_cb_to (EV_P_ struct ev_timer *w, int revents)
915	{	1494	{
916	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	1495	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
917	}	1496	}
918		1497
919	void	1498	void
920	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	1499	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
921	{	1500	{
922	struct ev_once *once = malloc (sizeof (struct ev_once));	1501	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
923		1502
924	if (!once)	1503	if (!once)
925	cb (EV_ERROR, arg);	1504	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
926	else	1505	else
927	{	1506	{
928	once->cb = cb;	1507	once->cb = cb;
929	once->arg = arg;	1508	once->arg = arg;
930		1509
931	evw_init (&once->io, once_cb_io);	1510	ev_watcher_init (&once->io, once_cb_io);
932
933	if (fd >= 0)	1511	if (fd >= 0)
934	{	1512	{
935	evio_set (&once->io, fd, events);	1513	ev_io_set (&once->io, fd, events);
936	evio_start (&once->io);	1514	ev_io_start (EV_A_ &once->io);
937	}	1515	}
938		1516
939	evw_init (&once->to, once_cb_to);	1517	ev_watcher_init (&once->to, once_cb_to);
940
941	if (timeout >= 0.)	1518	if (timeout >= 0.)
942	{	1519	{
943	evtimer_set (&once->to, timeout, 0.);	1520	ev_timer_set (&once->to, timeout, 0.);
944	evtimer_start (&once->to);	1521	ev_timer_start (EV_A_ &once->to);
945	}	1522	}
946	}	1523	}
947	}	1524	}
948		1525
949	/*****************************************************************************/
950
951	#if 0
952
953	struct ev_io wio;
954
955	static void
956	sin_cb (struct ev_io *w, int revents)
957	{
958	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
959	}
960
961	static void
962	ocb (struct ev_timer *w, int revents)
963	{
964	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
965	evtimer_stop (w);
966	evtimer_start (w);
967	}
968
969	static void
970	scb (struct ev_signal *w, int revents)
971	{
972	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
973	evio_stop (&wio);
974	evio_start (&wio);
975	}
976
977	static void
978	gcb (struct ev_signal *w, int revents)
979	{
980	fprintf (stderr, "generic %x\n", revents);
981
982	}
983
984	int main (void)
985	{
986	ev_init (0);
987
988	evio_init (&wio, sin_cb, 0, EV_READ);
989	evio_start (&wio);
990
991	struct ev_timer t[10000];
992
993	#if 0
994	int i;
995	for (i = 0; i < 10000; ++i)
996	{
997	struct ev_timer *w = t + i;
998	evw_init (w, ocb, i);
999	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1000	evtimer_start (w);
1001	if (drand48 () < 0.5)
1002	evtimer_stop (w);
1003	}
1004	#endif
1005
1006	struct ev_timer t1;
1007	evtimer_init (&t1, ocb, 5, 10);
1008	evtimer_start (&t1);
1009
1010	struct ev_signal sig;
1011	evsignal_init (&sig, scb, SIGQUIT);
1012	evsignal_start (&sig);
1013
1014	struct ev_check cw;
1015	evcheck_init (&cw, gcb);
1016	evcheck_start (&cw);
1017
1018	struct ev_idle iw;
1019	evidle_init (&iw, gcb);
1020	evidle_start (&iw);
1021
1022	ev_loop (0);
1023
1024	return 0;
1025	}
1026
1027	#endif
1028
1029
1030
1031

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