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Comparing libev/ev.c (file contents):
Revision 1.19 by root, Wed Oct 31 17:55:55 2007 UTC vs.
Revision 1.162 by root, Mon Dec 3 13:41:24 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	# ifndef EV_USE_INOTIFY
		100	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		101	# define EV_USE_INOTIFY 1
		102	# else
		103	# define EV_USE_INOTIFY 0
		104	# endif
		105	# endif
		106
		107	#endif
		108
30	#include <math.h>	109	#include <math.h>
31	#include <stdlib.h>	110	#include <stdlib.h>
32	#include <unistd.h>
33	#include <fcntl.h>	111	#include <fcntl.h>
34	#include <signal.h>
35	#include <stddef.h>	112	#include <stddef.h>
36		113
37	#include <stdio.h>	114	#include <stdio.h>
38		115
39	#include <assert.h>	116	#include <assert.h>
40	#include <errno.h>	117	#include <errno.h>
41	#include <sys/time.h>	118	#include <sys/types.h>
42	#include <time.h>	119	#include <time.h>
43		120
44	#ifndef HAVE_MONOTONIC	121	#include <signal.h>
45	# ifdef CLOCK_MONOTONIC	122
46	# define HAVE_MONOTONIC 1	123	#ifdef EV_H
		124	# include EV_H
		125	#else
		126	# include "ev.h"
		127	#endif
		128
		129	#ifndef _WIN32
		130	# include <sys/time.h>
		131	# include <sys/wait.h>
		132	# include <unistd.h>
		133	#else
		134	# define WIN32_LEAN_AND_MEAN
		135	# include <windows.h>
		136	# ifndef EV_SELECT_IS_WINSOCKET
		137	# define EV_SELECT_IS_WINSOCKET 1
47	# endif	138	# endif
48	#endif	139	#endif
49		140
		141	/**/
		142
		143	#ifndef EV_USE_MONOTONIC
		144	# define EV_USE_MONOTONIC 0
		145	#endif
		146
		147	#ifndef EV_USE_REALTIME
		148	# define EV_USE_REALTIME 0
		149	#endif
		150
50	#ifndef HAVE_SELECT	151	#ifndef EV_USE_SELECT
51	# define HAVE_SELECT 1	152	# define EV_USE_SELECT 1
		153	#endif
		154
		155	#ifndef EV_USE_POLL
		156	# ifdef _WIN32
		157	# define EV_USE_POLL 0
		158	# else
		159	# define EV_USE_POLL 1
52	#endif	160	# endif
		161	#endif
53		162
54	#ifndef HAVE_EPOLL	163	#ifndef EV_USE_EPOLL
55	# define HAVE_EPOLL 0	164	# define EV_USE_EPOLL 0
		165	#endif
		166
		167	#ifndef EV_USE_KQUEUE
		168	# define EV_USE_KQUEUE 0
		169	#endif
		170
		171	#ifndef EV_USE_PORT
		172	# define EV_USE_PORT 0
		173	#endif
		174
		175	#ifndef EV_USE_INOTIFY
		176	# define EV_USE_INOTIFY 0
		177	#endif
		178
		179	#ifndef EV_PID_HASHSIZE
		180	# if EV_MINIMAL
		181	# define EV_PID_HASHSIZE 1
		182	# else
		183	# define EV_PID_HASHSIZE 16
56	#endif	184	# endif
		185	#endif
57		186
58	#ifndef HAVE_REALTIME	187	#ifndef EV_INOTIFY_HASHSIZE
59	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	188	# if EV_MINIMAL
		189	# define EV_INOTIFY_HASHSIZE 1
		190	# else
		191	# define EV_INOTIFY_HASHSIZE 16
60	#endif	192	# endif
		193	#endif
		194
		195	/**/
		196
		197	#ifndef CLOCK_MONOTONIC
		198	# undef EV_USE_MONOTONIC
		199	# define EV_USE_MONOTONIC 0
		200	#endif
		201
		202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
		204	# define EV_USE_REALTIME 0
		205	#endif
		206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
61		220
62	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	221	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
63	#define MAX_BLOCKTIME 60.	222	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		223	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
64		224
65	#include "ev.h"	225	#if __GNUC__ >= 3
		226	# define expect(expr,value) __builtin_expect ((expr),(value))
		227	# define inline_size static inline /* inline for codesize */
		228	# if EV_MINIMAL
		229	# define noinline __attribute__ ((noinline))
		230	# define inline_speed static noinline
		231	# else
		232	# define noinline
		233	# define inline_speed static inline
		234	# endif
		235	#else
		236	# define expect(expr,value) (expr)
		237	# define inline_speed static
		238	# define inline_size static
		239	# define noinline
		240	#endif
66		241
		242	#define expect_false(expr) expect ((expr) != 0, 0)
		243	#define expect_true(expr) expect ((expr) != 0, 1)
		244
		245	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		246	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		247
		248	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		249	#define EMPTY2(a,b) /* used to suppress some warnings */
		250
67	typedef struct ev_watcher *W;	251	typedef ev_watcher *W;
68	typedef struct ev_watcher_list *WL;	252	typedef ev_watcher_list *WL;
69	typedef struct ev_watcher_time *WT;	253	typedef ev_watcher_time *WT;
70		254
71	static ev_tstamp now, diff; /* monotonic clock */	255	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		256
		257	#ifdef _WIN32
		258	# include "ev_win32.c"
		259	#endif
		260
		261	/*****************************************************************************/
		262
		263	static void (*syserr_cb)(const char *msg);
		264
		265	void
		266	ev_set_syserr_cb (void (*cb)(const char *msg))
		267	{
		268	syserr_cb = cb;
		269	}
		270
		271	static void noinline
		272	syserr (const char *msg)
		273	{
		274	if (!msg)
		275	msg = "(libev) system error";
		276
		277	if (syserr_cb)
		278	syserr_cb (msg);
		279	else
		280	{
		281	perror (msg);
		282	abort ();
		283	}
		284	}
		285
		286	static void *(*alloc)(void *ptr, long size);
		287
		288	void
		289	ev_set_allocator (void *(*cb)(void *ptr, long size))
		290	{
		291	alloc = cb;
		292	}
		293
		294	inline_speed void *
		295	ev_realloc (void *ptr, long size)
		296	{
		297	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		298
		299	if (!ptr && size)
		300	{
		301	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		302	abort ();
		303	}
		304
		305	return ptr;
		306	}
		307
		308	#define ev_malloc(size) ev_realloc (0, (size))
		309	#define ev_free(ptr) ev_realloc ((ptr), 0)
		310
		311	/*****************************************************************************/
		312
		313	typedef struct
		314	{
		315	WL head;
		316	unsigned char events;
		317	unsigned char reify;
		318	#if EV_SELECT_IS_WINSOCKET
		319	SOCKET handle;
		320	#endif
		321	} ANFD;
		322
		323	typedef struct
		324	{
		325	W w;
		326	int events;
		327	} ANPENDING;
		328
		329	#if EV_USE_INOTIFY
		330	typedef struct
		331	{
		332	WL head;
		333	} ANFS;
		334	#endif
		335
		336	#if EV_MULTIPLICITY
		337
		338	struct ev_loop
		339	{
		340	ev_tstamp ev_rt_now;
		341	#define ev_rt_now ((loop)->ev_rt_now)
		342	#define VAR(name,decl) decl;
		343	#include "ev_vars.h"
		344	#undef VAR
		345	};
		346	#include "ev_wrap.h"
		347
		348	static struct ev_loop default_loop_struct;
		349	struct ev_loop *ev_default_loop_ptr;
		350
		351	#else
		352
72	ev_tstamp ev_now;	353	ev_tstamp ev_rt_now;
73	int ev_method;	354	#define VAR(name,decl) static decl;
		355	#include "ev_vars.h"
		356	#undef VAR
74		357
75	static int have_monotonic; /* runtime */	358	static int ev_default_loop_ptr;
76		359
77	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	360	#endif
78	static void (*method_modify)(int fd, int oev, int nev);
79	static void (*method_poll)(ev_tstamp timeout);
80		361
81	/*****************************************************************************/	362	/*****************************************************************************/
82		363
83	ev_tstamp	364	ev_tstamp
84	ev_time (void)	365	ev_time (void)
85	{	366	{
86	#if HAVE_REALTIME	367	#if EV_USE_REALTIME
87	struct timespec ts;	368	struct timespec ts;
88	clock_gettime (CLOCK_REALTIME, &ts);	369	clock_gettime (CLOCK_REALTIME, &ts);
89	return ts.tv_sec + ts.tv_nsec * 1e-9;	370	return ts.tv_sec + ts.tv_nsec * 1e-9;
90	#else	371	#else
91	struct timeval tv;	372	struct timeval tv;
92	gettimeofday (&tv, 0);	373	gettimeofday (&tv, 0);
93	return tv.tv_sec + tv.tv_usec * 1e-6;	374	return tv.tv_sec + tv.tv_usec * 1e-6;
94	#endif	375	#endif
95	}	376	}
96		377
97	static ev_tstamp	378	ev_tstamp inline_size
98	get_clock (void)	379	get_clock (void)
99	{	380	{
100	#if HAVE_MONOTONIC	381	#if EV_USE_MONOTONIC
101	if (have_monotonic)	382	if (expect_true (have_monotonic))
102	{	383	{
103	struct timespec ts;	384	struct timespec ts;
104	clock_gettime (CLOCK_MONOTONIC, &ts);	385	clock_gettime (CLOCK_MONOTONIC, &ts);
105	return ts.tv_sec + ts.tv_nsec * 1e-9;	386	return ts.tv_sec + ts.tv_nsec * 1e-9;
106	}	387	}
107	#endif	388	#endif
108		389
109	return ev_time ();	390	return ev_time ();
110	}	391	}
111		392
		393	#if EV_MULTIPLICITY
		394	ev_tstamp
		395	ev_now (EV_P)
		396	{
		397	return ev_rt_now;
		398	}
		399	#endif
		400
		401	#define array_roundsize(type,n) (((n) | 4) & ~3)
		402
112	#define array_needsize(base,cur,cnt,init) \	403	#define array_needsize(type,base,cur,cnt,init) \
113	if ((cnt) > cur) \	404	if (expect_false ((cnt) > cur)) \
114	{ \	405	{ \
115	int newcnt = cur ? cur << 1 : 16; \	406	int newcnt = cur; \
		407	do \
		408	{ \
		409	newcnt = array_roundsize (type, newcnt << 1); \
		410	} \
		411	while ((cnt) > newcnt); \
		412	\
116	base = realloc (base, sizeof (*base) * (newcnt)); \	413	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
117	init (base + cur, newcnt - cur); \	414	init (base + cur, newcnt - cur); \
118	cur = newcnt; \	415	cur = newcnt; \
119	}	416	}
		417
		418	#define array_slim(type,stem) \
		419	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		420	{ \
		421	stem ## max = array_roundsize (stem ## cnt >> 1); \
		422	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		423	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		424	}
		425
		426	#define array_free(stem, idx) \
		427	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
120		428
121	/*****************************************************************************/	429	/*****************************************************************************/
122		430
		431	void noinline
		432	ev_feed_event (EV_P_ void *w, int revents)
		433	{
		434	W w_ = (W)w;
		435
		436	if (expect_false (w_->pending))
		437	{
		438	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		439	return;
		440	}
		441
		442	w_->pending = ++pendingcnt [ABSPRI (w_)];
		443	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		444	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		445	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		446	}
		447
		448	void inline_size
		449	queue_events (EV_P_ W *events, int eventcnt, int type)
		450	{
		451	int i;
		452
		453	for (i = 0; i < eventcnt; ++i)
		454	ev_feed_event (EV_A_ events [i], type);
		455	}
		456
		457	/*****************************************************************************/
		458
		459	void inline_size
		460	anfds_init (ANFD *base, int count)
		461	{
		462	while (count--)
		463	{
		464	base->head = 0;
		465	base->events = EV_NONE;
		466	base->reify = 0;
		467
		468	++base;
		469	}
		470	}
		471
		472	void inline_speed
		473	fd_event (EV_P_ int fd, int revents)
		474	{
		475	ANFD *anfd = anfds + fd;
		476	ev_io *w;
		477
		478	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		479	{
		480	int ev = w->events & revents;
		481
		482	if (ev)
		483	ev_feed_event (EV_A_ (W)w, ev);
		484	}
		485	}
		486
		487	void
		488	ev_feed_fd_event (EV_P_ int fd, int revents)
		489	{
		490	fd_event (EV_A_ fd, revents);
		491	}
		492
		493	void inline_size
		494	fd_reify (EV_P)
		495	{
		496	int i;
		497
		498	for (i = 0; i < fdchangecnt; ++i)
		499	{
		500	int fd = fdchanges [i];
		501	ANFD *anfd = anfds + fd;
		502	ev_io *w;
		503
		504	int events = 0;
		505
		506	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		507	events |= w->events;
		508
		509	#if EV_SELECT_IS_WINSOCKET
		510	if (events)
		511	{
		512	unsigned long argp;
		513	anfd->handle = _get_osfhandle (fd);
		514	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		515	}
		516	#endif
		517
		518	anfd->reify = 0;
		519
		520	backend_modify (EV_A_ fd, anfd->events, events);
		521	anfd->events = events;
		522	}
		523
		524	fdchangecnt = 0;
		525	}
		526
		527	void inline_size
		528	fd_change (EV_P_ int fd)
		529	{
		530	if (expect_false (anfds [fd].reify))
		531	return;
		532
		533	anfds [fd].reify = 1;
		534
		535	++fdchangecnt;
		536	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		537	fdchanges [fdchangecnt - 1] = fd;
		538	}
		539
		540	void inline_speed
		541	fd_kill (EV_P_ int fd)
		542	{
		543	ev_io *w;
		544
		545	while ((w = (ev_io *)anfds [fd].head))
		546	{
		547	ev_io_stop (EV_A_ w);
		548	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		549	}
		550	}
		551
		552	int inline_size
		553	fd_valid (int fd)
		554	{
		555	#ifdef _WIN32
		556	return _get_osfhandle (fd) != -1;
		557	#else
		558	return fcntl (fd, F_GETFD) != -1;
		559	#endif
		560	}
		561
		562	/* called on EBADF to verify fds */
		563	static void noinline
		564	fd_ebadf (EV_P)
		565	{
		566	int fd;
		567
		568	for (fd = 0; fd < anfdmax; ++fd)
		569	if (anfds [fd].events)
		570	if (!fd_valid (fd) == -1 && errno == EBADF)
		571	fd_kill (EV_A_ fd);
		572	}
		573
		574	/* called on ENOMEM in select/poll to kill some fds and retry */
		575	static void noinline
		576	fd_enomem (EV_P)
		577	{
		578	int fd;
		579
		580	for (fd = anfdmax; fd--; )
		581	if (anfds [fd].events)
		582	{
		583	fd_kill (EV_A_ fd);
		584	return;
		585	}
		586	}
		587
		588	/* usually called after fork if backend needs to re-arm all fds from scratch */
		589	static void noinline
		590	fd_rearm_all (EV_P)
		591	{
		592	int fd;
		593
		594	for (fd = 0; fd < anfdmax; ++fd)
		595	if (anfds [fd].events)
		596	{
		597	anfds [fd].events = 0;
		598	fd_change (EV_A_ fd);
		599	}
		600	}
		601
		602	/*****************************************************************************/
		603
		604	void inline_speed
		605	upheap (WT *heap, int k)
		606	{
		607	WT w = heap [k];
		608
		609	while (k && heap [k >> 1]->at > w->at)
		610	{
		611	heap [k] = heap [k >> 1];
		612	((W)heap [k])->active = k + 1;
		613	k >>= 1;
		614	}
		615
		616	heap [k] = w;
		617	((W)heap [k])->active = k + 1;
		618
		619	}
		620
		621	void inline_speed
		622	downheap (WT *heap, int N, int k)
		623	{
		624	WT w = heap [k];
		625
		626	while (k < (N >> 1))
		627	{
		628	int j = k << 1;
		629
		630	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		631	++j;
		632
		633	if (w->at <= heap [j]->at)
		634	break;
		635
		636	heap [k] = heap [j];
		637	((W)heap [k])->active = k + 1;
		638	k = j;
		639	}
		640
		641	heap [k] = w;
		642	((W)heap [k])->active = k + 1;
		643	}
		644
		645	void inline_size
		646	adjustheap (WT *heap, int N, int k)
		647	{
		648	upheap (heap, k);
		649	downheap (heap, N, k);
		650	}
		651
		652	/*****************************************************************************/
		653
123	typedef struct	654	typedef struct
124	{	655	{
125	struct ev_io *head;	656	WL 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
136	anfds_init (ANFD *base, int count)
137	{
138	while (count--)
139	{
140	base->head = 0;
141	base->wev = base->rev = EV_NONE;
142	++base;
143	}
144	}
145
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
156	event (W w, int events)
157	{
158	if (w->active)
159	{
160	w->pending = ++pendingcnt;
161	array_needsize (pendings, pendingmax, pendingcnt, );
162	pendings [pendingcnt - 1].w = w;
163	pendings [pendingcnt - 1].events = events;
164	}
165	}
166
167	static void
168	fd_event (int fd, int events)
169	{
170	ANFD *anfd = anfds + fd;
171	struct ev_io *w;
172
173	for (w = anfd->head; w; w = w->next)
174	{
175	int ev = w->events & events;
176
177	if (ev)
178	event ((W)w, ev);
179	}
180	}
181
182	static void
183	queue_events (W *events, int eventcnt, int type)
184	{
185	int i;
186
187	for (i = 0; i < eventcnt; ++i)
188	event (events [i], type);
189	}
190
191	/* called on EBADF to verify fds */
192	static void
193	fd_recheck ()
194	{
195	int fd;
196
197	for (fd = 0; fd < anfdmax; ++fd)
198	if (anfds [fd].wev)
199	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
200	while (anfds [fd].head)
201	evio_stop (anfds [fd].head);
202	}
203
204	/*****************************************************************************/
205
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
213	upheap (WT *timers, int k)
214	{
215	WT w = timers [k];
216
217	while (k && timers [k >> 1]->at > w->at)
218	{
219	timers [k] = timers [k >> 1];
220	timers [k]->active = k + 1;
221	k >>= 1;
222	}
223
224	timers [k] = w;
225	timers [k]->active = k + 1;
226
227	}
228
229	static void
230	downheap (WT *timers, int N, int k)
231	{
232	WT w = timers [k];
233
234	while (k < (N >> 1))
235	{
236	int j = k << 1;
237
238	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
239	++j;
240
241	if (w->at <= timers [j]->at)
242	break;
243
244	timers [k] = timers [j];
245	timers [k]->active = k + 1;
246	k = j;
247	}
248
249	timers [k] = w;
250	timers [k]->active = k + 1;
251	}
252
253	/*****************************************************************************/
254
255	typedef struct
256	{
257	struct ev_signal *head;
258	sig_atomic_t gotsig;	657	sig_atomic_t volatile gotsig;
259	} ANSIG;	658	} ANSIG;
260		659
261	static ANSIG *signals;	660	static ANSIG *signals;
262	static int signalmax;	661	static int signalmax;
263		662
264	static int sigpipe [2];	663	static int sigpipe [2];
265	static sig_atomic_t gotsig;	664	static sig_atomic_t volatile gotsig;
266	static struct ev_io sigev;	665	static ev_io sigev;
267		666
268	static void	667	void inline_size
269	signals_init (ANSIG *base, int count)	668	signals_init (ANSIG *base, int count)
270	{	669	{
271	while (count--)	670	while (count--)
272	{	671	{
273	base->head = 0;	672	base->head = 0;
274	base->gotsig = 0;	673	base->gotsig = 0;
		674
275	++base;	675	++base;
276	}	676	}
277	}	677	}
278		678
279	static void	679	static void
280	sighandler (int signum)	680	sighandler (int signum)
281	{	681	{
		682	#if _WIN32
		683	signal (signum, sighandler);
		684	#endif
		685
282	signals [signum - 1].gotsig = 1;	686	signals [signum - 1].gotsig = 1;
283		687
284	if (!gotsig)	688	if (!gotsig)
285	{	689	{
		690	int old_errno = errno;
286	gotsig = 1;	691	gotsig = 1;
287	write (sigpipe [1], &gotsig, 1);	692	write (sigpipe [1], &signum, 1);
		693	errno = old_errno;
288	}	694	}
		695	}
		696
		697	void noinline
		698	ev_feed_signal_event (EV_P_ int signum)
		699	{
		700	WL w;
		701
		702	#if EV_MULTIPLICITY
		703	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		704	#endif
		705
		706	--signum;
		707
		708	if (signum < 0 || signum >= signalmax)
		709	return;
		710
		711	signals [signum].gotsig = 0;
		712
		713	for (w = signals [signum].head; w; w = w->next)
		714	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
289	}	715	}
290		716
291	static void	717	static void
292	sigcb (struct ev_io *iow, int revents)	718	sigcb (EV_P_ ev_io *iow, int revents)
293	{	719	{
294	struct ev_signal *w;
295	int sig;	720	int signum;
296		721
		722	read (sigpipe [0], &revents, 1);
297	gotsig = 0;	723	gotsig = 0;
298	read (sigpipe [0], &revents, 1);
299		724
300	for (sig = signalmax; sig--; )	725	for (signum = signalmax; signum--; )
301	if (signals [sig].gotsig)	726	if (signals [signum].gotsig)
		727	ev_feed_signal_event (EV_A_ signum + 1);
		728	}
		729
		730	void inline_size
		731	fd_intern (int fd)
		732	{
		733	#ifdef _WIN32
		734	int arg = 1;
		735	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		736	#else
		737	fcntl (fd, F_SETFD, FD_CLOEXEC);
		738	fcntl (fd, F_SETFL, O_NONBLOCK);
		739	#endif
		740	}
		741
		742	static void noinline
		743	siginit (EV_P)
		744	{
		745	fd_intern (sigpipe [0]);
		746	fd_intern (sigpipe [1]);
		747
		748	ev_io_set (&sigev, sigpipe [0], EV_READ);
		749	ev_io_start (EV_A_ &sigev);
		750	ev_unref (EV_A); /* child watcher should not keep loop alive */
		751	}
		752
		753	/*****************************************************************************/
		754
		755	static ev_child *childs [EV_PID_HASHSIZE];
		756
		757	#ifndef _WIN32
		758
		759	static ev_signal childev;
		760
		761	void inline_speed
		762	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		763	{
		764	ev_child *w;
		765
		766	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		767	if (w->pid == pid || !w->pid)
302	{	768	{
303	signals [sig].gotsig = 0;	769	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
304		770	w->rpid = pid;
305	for (w = signals [sig].head; w; w = w->next)	771	w->rstatus = status;
306	event ((W)w, EV_SIGNAL);	772	ev_feed_event (EV_A_ (W)w, EV_CHILD);
307	}	773	}
308	}	774	}
309		775
		776	#ifndef WCONTINUED
		777	# define WCONTINUED 0
		778	#endif
		779
310	static void	780	static void
311	siginit (void)	781	childcb (EV_P_ ev_signal *sw, int revents)
312	{	782	{
313	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	783	int pid, status;
314	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
315		784
316	/* rather than sort out wether we really need nb, set it */	785	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
317	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	786	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
318	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	787	if (!WCONTINUED
		788	|| errno != EINVAL
		789	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		790	return;
319		791
320	evio_set (&sigev, sigpipe [0], EV_READ);	792	/* make sure we are called again until all childs have been reaped */
321	evio_start (&sigev);	793	/* we need to do it this way so that the callback gets called before we continue */
		794	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		795
		796	child_reap (EV_A_ sw, pid, pid, status);
		797	if (EV_PID_HASHSIZE > 1)
		798	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
322	}	799	}
		800
		801	#endif
323		802
324	/*****************************************************************************/	803	/*****************************************************************************/
325		804
326	static struct ev_idle **idles;	805	#if EV_USE_PORT
327	static int idlemax, idlecnt;	806	# include "ev_port.c"
		807	#endif
		808	#if EV_USE_KQUEUE
		809	# include "ev_kqueue.c"
		810	#endif
		811	#if EV_USE_EPOLL
		812	# include "ev_epoll.c"
		813	#endif
		814	#if EV_USE_POLL
		815	# include "ev_poll.c"
		816	#endif
		817	#if EV_USE_SELECT
		818	# include "ev_select.c"
		819	#endif
328		820
329	static struct ev_check **checks;	821	int
330	static int checkmax, checkcnt;	822	ev_version_major (void)
		823	{
		824	return EV_VERSION_MAJOR;
		825	}
		826
		827	int
		828	ev_version_minor (void)
		829	{
		830	return EV_VERSION_MINOR;
		831	}
		832
		833	/* return true if we are running with elevated privileges and should ignore env variables */
		834	int inline_size
		835	enable_secure (void)
		836	{
		837	#ifdef _WIN32
		838	return 0;
		839	#else
		840	return getuid () != geteuid ()
		841	|| getgid () != getegid ();
		842	#endif
		843	}
		844
		845	unsigned int
		846	ev_supported_backends (void)
		847	{
		848	unsigned int flags = 0;
		849
		850	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		851	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		852	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		853	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		854	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		855
		856	return flags;
		857	}
		858
		859	unsigned int
		860	ev_recommended_backends (void)
		861	{
		862	unsigned int flags = ev_supported_backends ();
		863
		864	#ifndef __NetBSD__
		865	/* kqueue is borked on everything but netbsd apparently */
		866	/* it usually doesn't work correctly on anything but sockets and pipes */
		867	flags &= ~EVBACKEND_KQUEUE;
		868	#endif
		869	#ifdef __APPLE__
		870	// flags &= ~EVBACKEND_KQUEUE; for documentation
		871	flags &= ~EVBACKEND_POLL;
		872	#endif
		873
		874	return flags;
		875	}
		876
		877	unsigned int
		878	ev_embeddable_backends (void)
		879	{
		880	return EVBACKEND_EPOLL
		881	| EVBACKEND_KQUEUE
		882	| EVBACKEND_PORT;
		883	}
		884
		885	unsigned int
		886	ev_backend (EV_P)
		887	{
		888	return backend;
		889	}
		890
		891	unsigned int
		892	ev_loop_count (EV_P)
		893	{
		894	return loop_count;
		895	}
		896
		897	static void noinline
		898	loop_init (EV_P_ unsigned int flags)
		899	{
		900	if (!backend)
		901	{
		902	#if EV_USE_MONOTONIC
		903	{
		904	struct timespec ts;
		905	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		906	have_monotonic = 1;
		907	}
		908	#endif
		909
		910	ev_rt_now = ev_time ();
		911	mn_now = get_clock ();
		912	now_floor = mn_now;
		913	rtmn_diff = ev_rt_now - mn_now;
		914
		915	/* pid check not overridable via env */
		916	#ifndef _WIN32
		917	if (flags & EVFLAG_FORKCHECK)
		918	curpid = getpid ();
		919	#endif
		920
		921	if (!(flags & EVFLAG_NOENV)
		922	&& !enable_secure ()
		923	&& getenv ("LIBEV_FLAGS"))
		924	flags = atoi (getenv ("LIBEV_FLAGS"));
		925
		926	if (!(flags & 0x0000ffffUL))
		927	flags |= ev_recommended_backends ();
		928
		929	backend = 0;
		930	backend_fd = -1;
		931	#if EV_USE_INOTIFY
		932	fs_fd = -2;
		933	#endif
		934
		935	#if EV_USE_PORT
		936	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		937	#endif
		938	#if EV_USE_KQUEUE
		939	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		940	#endif
		941	#if EV_USE_EPOLL
		942	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		943	#endif
		944	#if EV_USE_POLL
		945	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		946	#endif
		947	#if EV_USE_SELECT
		948	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		949	#endif
		950
		951	ev_init (&sigev, sigcb);
		952	ev_set_priority (&sigev, EV_MAXPRI);
		953	}
		954	}
		955
		956	static void noinline
		957	loop_destroy (EV_P)
		958	{
		959	int i;
		960
		961	#if EV_USE_INOTIFY
		962	if (fs_fd >= 0)
		963	close (fs_fd);
		964	#endif
		965
		966	if (backend_fd >= 0)
		967	close (backend_fd);
		968
		969	#if EV_USE_PORT
		970	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		971	#endif
		972	#if EV_USE_KQUEUE
		973	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		974	#endif
		975	#if EV_USE_EPOLL
		976	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		977	#endif
		978	#if EV_USE_POLL
		979	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		980	#endif
		981	#if EV_USE_SELECT
		982	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		983	#endif
		984
		985	for (i = NUMPRI; i--; )
		986	array_free (pending, [i]);
		987
		988	/* have to use the microsoft-never-gets-it-right macro */
		989	array_free (fdchange, EMPTY0);
		990	array_free (timer, EMPTY0);
		991	#if EV_PERIODIC_ENABLE
		992	array_free (periodic, EMPTY0);
		993	#endif
		994	array_free (idle, EMPTY0);
		995	array_free (prepare, EMPTY0);
		996	array_free (check, EMPTY0);
		997
		998	backend = 0;
		999	}
		1000
		1001	void inline_size infy_fork (EV_P);
		1002
		1003	void inline_size
		1004	loop_fork (EV_P)
		1005	{
		1006	#if EV_USE_PORT
		1007	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1008	#endif
		1009	#if EV_USE_KQUEUE
		1010	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1011	#endif
		1012	#if EV_USE_EPOLL
		1013	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1014	#endif
		1015	#if EV_USE_INOTIFY
		1016	infy_fork (EV_A);
		1017	#endif
		1018
		1019	if (ev_is_active (&sigev))
		1020	{
		1021	/* default loop */
		1022
		1023	ev_ref (EV_A);
		1024	ev_io_stop (EV_A_ &sigev);
		1025	close (sigpipe [0]);
		1026	close (sigpipe [1]);
		1027
		1028	while (pipe (sigpipe))
		1029	syserr ("(libev) error creating pipe");
		1030
		1031	siginit (EV_A);
		1032	}
		1033
		1034	postfork = 0;
		1035	}
		1036
		1037	#if EV_MULTIPLICITY
		1038	struct ev_loop *
		1039	ev_loop_new (unsigned int flags)
		1040	{
		1041	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1042
		1043	memset (loop, 0, sizeof (struct ev_loop));
		1044
		1045	loop_init (EV_A_ flags);
		1046
		1047	if (ev_backend (EV_A))
		1048	return loop;
		1049
		1050	return 0;
		1051	}
		1052
		1053	void
		1054	ev_loop_destroy (EV_P)
		1055	{
		1056	loop_destroy (EV_A);
		1057	ev_free (loop);
		1058	}
		1059
		1060	void
		1061	ev_loop_fork (EV_P)
		1062	{
		1063	postfork = 1;
		1064	}
		1065
		1066	#endif
		1067
		1068	#if EV_MULTIPLICITY
		1069	struct ev_loop *
		1070	ev_default_loop_init (unsigned int flags)
		1071	#else
		1072	int
		1073	ev_default_loop (unsigned int flags)
		1074	#endif
		1075	{
		1076	if (sigpipe [0] == sigpipe [1])
		1077	if (pipe (sigpipe))
		1078	return 0;
		1079
		1080	if (!ev_default_loop_ptr)
		1081	{
		1082	#if EV_MULTIPLICITY
		1083	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1084	#else
		1085	ev_default_loop_ptr = 1;
		1086	#endif
		1087
		1088	loop_init (EV_A_ flags);
		1089
		1090	if (ev_backend (EV_A))
		1091	{
		1092	siginit (EV_A);
		1093
		1094	#ifndef _WIN32
		1095	ev_signal_init (&childev, childcb, SIGCHLD);
		1096	ev_set_priority (&childev, EV_MAXPRI);
		1097	ev_signal_start (EV_A_ &childev);
		1098	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1099	#endif
		1100	}
		1101	else
		1102	ev_default_loop_ptr = 0;
		1103	}
		1104
		1105	return ev_default_loop_ptr;
		1106	}
		1107
		1108	void
		1109	ev_default_destroy (void)
		1110	{
		1111	#if EV_MULTIPLICITY
		1112	struct ev_loop *loop = ev_default_loop_ptr;
		1113	#endif
		1114
		1115	#ifndef _WIN32
		1116	ev_ref (EV_A); /* child watcher */
		1117	ev_signal_stop (EV_A_ &childev);
		1118	#endif
		1119
		1120	ev_ref (EV_A); /* signal watcher */
		1121	ev_io_stop (EV_A_ &sigev);
		1122
		1123	close (sigpipe [0]); sigpipe [0] = 0;
		1124	close (sigpipe [1]); sigpipe [1] = 0;
		1125
		1126	loop_destroy (EV_A);
		1127	}
		1128
		1129	void
		1130	ev_default_fork (void)
		1131	{
		1132	#if EV_MULTIPLICITY
		1133	struct ev_loop *loop = ev_default_loop_ptr;
		1134	#endif
		1135
		1136	if (backend)
		1137	postfork = 1;
		1138	}
331		1139
332	/*****************************************************************************/	1140	/*****************************************************************************/
333		1141
334	#if HAVE_EPOLL	1142	int inline_size
335	# include "ev_epoll.c"	1143	any_pending (EV_P)
336	#endif
337	#if HAVE_SELECT
338	# include "ev_select.c"
339	#endif
340
341	int ev_init (int flags)
342	{	1144	{
343	#if HAVE_MONOTONIC	1145	int pri;
344	{
345	struct timespec ts;
346	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
347	have_monotonic = 1;
348	}
349	#endif
350		1146
351	ev_now = ev_time ();	1147	for (pri = NUMPRI; pri--; )
352	now = get_clock ();	1148	if (pendingcnt [pri])
353	diff = ev_now - now;	1149	return 1;
354		1150
355	if (pipe (sigpipe))
356	return 0;	1151	return 0;
357
358	ev_method = EVMETHOD_NONE;
359	#if HAVE_EPOLL
360	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
361	#endif
362	#if HAVE_SELECT
363	if (ev_method == EVMETHOD_NONE) select_init (flags);
364	#endif
365
366	if (ev_method)
367	{
368	evw_init (&sigev, sigcb);
369	siginit ();
370	}
371
372	return ev_method;
373	}	1152	}
374		1153
375	/*****************************************************************************/	1154	void inline_speed
376		1155	call_pending (EV_P)
377	void ev_prefork (void)
378	{	1156	{
379	/* nop */
380	}
381
382	void ev_postfork_parent (void)
383	{
384	/* nop */
385	}
386
387	void ev_postfork_child (void)
388	{
389	#if HAVE_EPOLL
390	if (ev_method == EVMETHOD_EPOLL)
391	epoll_postfork_child ();
392	#endif
393
394	evio_stop (&sigev);
395	close (sigpipe [0]);
396	close (sigpipe [1]);
397	pipe (sigpipe);
398	siginit ();
399	}
400
401	/*****************************************************************************/
402
403	static void
404	fd_reify (void)
405	{
406	int i;	1157	int pri;
407		1158
408	for (i = 0; i < fdchangecnt; ++i)	1159	for (pri = NUMPRI; pri--; )
		1160	while (pendingcnt [pri])
409	{	1161	{
410	int fd = fdchanges [i];	1162	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
411	ANFD *anfd = anfds + fd;
412	struct ev_io *w;
413		1163
414	int wev = 0;	1164	if (expect_true (p->w))
415
416	for (w = anfd->head; w; w = w->next)
417	wev |= w->events;
418
419	if (anfd->wev != wev)
420	{	1165	{
421	method_modify (fd, anfd->wev, wev);	1166	/*assert (("non-pending watcher on pending list", p->w->pending));*/
422	anfd->wev = wev;
423	}
424	}
425		1167
426	fdchangecnt = 0;
427	}
428
429	static void
430	call_pending ()
431	{
432	while (pendingcnt)
433	{
434	ANPENDING *p = pendings + --pendingcnt;
435
436	if (p->w)
437	{
438	p->w->pending = 0;	1168	p->w->pending = 0;
439	p->w->cb (p->w, p->events);	1169	EV_CB_INVOKE (p->w, p->events);
440	}	1170	}
441	}	1171	}
442	}	1172	}
443		1173
444	static void	1174	void inline_size
445	timers_reify ()	1175	timers_reify (EV_P)
446	{	1176	{
447	while (timercnt && timers [0]->at <= now)	1177	while (timercnt && ((WT)timers [0])->at <= mn_now)
448	{	1178	{
449	struct ev_timer *w = timers [0];	1179	ev_timer *w = timers [0];
450		1180
451	event ((W)w, EV_TIMEOUT);	1181	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
452		1182
453	/* first reschedule or stop timer */	1183	/* first reschedule or stop timer */
454	if (w->repeat)	1184	if (w->repeat)
455	{	1185	{
		1186	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1187
456	w->at = now + w->repeat;	1188	((WT)w)->at += w->repeat;
457	assert (("timer timeout in the past, negative repeat?", w->at > now));	1189	if (((WT)w)->at < mn_now)
		1190	((WT)w)->at = mn_now;
		1191
458	downheap ((WT *)timers, timercnt, 0);	1192	downheap ((WT *)timers, timercnt, 0);
459	}	1193	}
460	else	1194	else
461	evtimer_stop (w); /* nonrepeating: stop timer */	1195	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
462	}
463	}
464		1196
465	static void	1197	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1198	}
		1199	}
		1200
		1201	#if EV_PERIODIC_ENABLE
		1202	void inline_size
466	periodics_reify ()	1203	periodics_reify (EV_P)
467	{	1204	{
468	while (periodiccnt && periodics [0]->at <= ev_now)	1205	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
469	{	1206	{
470	struct ev_periodic *w = periodics [0];	1207	ev_periodic *w = periodics [0];
		1208
		1209	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
471		1210
472	/* first reschedule or stop timer */	1211	/* first reschedule or stop timer */
473	if (w->interval)	1212	if (w->reschedule_cb)
474	{	1213	{
		1214	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1215	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1216	downheap ((WT *)periodics, periodiccnt, 0);
		1217	}
		1218	else if (w->interval)
		1219	{
475	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1220	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
476	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1221	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
477	downheap ((WT *)periodics, periodiccnt, 0);	1222	downheap ((WT *)periodics, periodiccnt, 0);
478	}	1223	}
479	else	1224	else
480	evperiodic_stop (w); /* nonrepeating: stop timer */	1225	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
481		1226
482	event ((W)w, EV_TIMEOUT);	1227	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
483	}	1228	}
484	}	1229	}
485		1230
486	static void	1231	static void noinline
487	periodics_reschedule (ev_tstamp diff)	1232	periodics_reschedule (EV_P)
488	{	1233	{
489	int i;	1234	int i;
490		1235
491	/* adjust periodics after time jump */	1236	/* adjust periodics after time jump */
492	for (i = 0; i < periodiccnt; ++i)	1237	for (i = 0; i < periodiccnt; ++i)
493	{	1238	{
494	struct ev_periodic *w = periodics [i];	1239	ev_periodic *w = periodics [i];
495		1240
		1241	if (w->reschedule_cb)
		1242	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
496	if (w->interval)	1243	else if (w->interval)
		1244	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1245	}
		1246
		1247	/* now rebuild the heap */
		1248	for (i = periodiccnt >> 1; i--; )
		1249	downheap ((WT *)periodics, periodiccnt, i);
		1250	}
		1251	#endif
		1252
		1253	int inline_size
		1254	time_update_monotonic (EV_P)
		1255	{
		1256	mn_now = get_clock ();
		1257
		1258	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1259	{
		1260	ev_rt_now = rtmn_diff + mn_now;
		1261	return 0;
		1262	}
		1263	else
		1264	{
		1265	now_floor = mn_now;
		1266	ev_rt_now = ev_time ();
		1267	return 1;
		1268	}
		1269	}
		1270
		1271	void inline_size
		1272	time_update (EV_P)
		1273	{
		1274	int i;
		1275
		1276	#if EV_USE_MONOTONIC
		1277	if (expect_true (have_monotonic))
		1278	{
		1279	if (time_update_monotonic (EV_A))
497	{	1280	{
498	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1281	ev_tstamp odiff = rtmn_diff;
499		1282
500	if (fabs (diff) >= 1e-4)	1283	/* loop a few times, before making important decisions.
		1284	* on the choice of "4": one iteration isn't enough,
		1285	* in case we get preempted during the calls to
		1286	* ev_time and get_clock. a second call is almost guaranteed
		1287	* to succeed in that case, though. and looping a few more times
		1288	* doesn't hurt either as we only do this on time-jumps or
		1289	* in the unlikely event of having been preempted here.
		1290	*/
		1291	for (i = 4; --i; )
501	{	1292	{
502	evperiodic_stop (w);	1293	rtmn_diff = ev_rt_now - mn_now;
503	evperiodic_start (w);
504		1294
505	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1295	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1296	return; /* all is well */
		1297
		1298	ev_rt_now = ev_time ();
		1299	mn_now = get_clock ();
		1300	now_floor = mn_now;
506	}	1301	}
		1302
		1303	# if EV_PERIODIC_ENABLE
		1304	periodics_reschedule (EV_A);
		1305	# endif
		1306	/* no timer adjustment, as the monotonic clock doesn't jump */
		1307	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
507	}	1308	}
508	}	1309	}
509	}	1310	else
510		1311	#endif
511	static void	1312	{
512	time_update ()
513	{
514	int i;
515
516	ev_now = ev_time ();	1313	ev_rt_now = ev_time ();
517		1314
518	if (have_monotonic)	1315	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
519	{
520	ev_tstamp odiff = diff;
521
522	for (i = 4; --i; ) /* loop a few times, before making important decisions */
523	{	1316	{
524	now = get_clock ();	1317	#if EV_PERIODIC_ENABLE
525	diff = ev_now - now;	1318	periodics_reschedule (EV_A);
		1319	#endif
526		1320
527	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1321	/* adjust timers. this is easy, as the offset is the same for all of them */
528	return; /* all is well */	1322	for (i = 0; i < timercnt; ++i)
529		1323	((WT)timers [i])->at += ev_rt_now - mn_now;
530	ev_now = ev_time ();
531	}	1324	}
532		1325
533	periodics_reschedule (diff - odiff);	1326	mn_now = ev_rt_now;
534	/* no timer adjustment, as the monotonic clock doesn't jump */
535	}
536	else
537	{	1327	}
538	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1328	}
		1329
		1330	void
		1331	ev_ref (EV_P)
		1332	{
		1333	++activecnt;
		1334	}
		1335
		1336	void
		1337	ev_unref (EV_P)
		1338	{
		1339	--activecnt;
		1340	}
		1341
		1342	static int loop_done;
		1343
		1344	void
		1345	ev_loop (EV_P_ int flags)
		1346	{
		1347	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1348	? EVUNLOOP_ONE
		1349	: EVUNLOOP_CANCEL;
		1350
		1351	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
		1352
		1353	do
		1354	{
		1355	#ifndef _WIN32
		1356	if (expect_false (curpid)) /* penalise the forking check even more */
		1357	if (expect_false (getpid () != curpid))
		1358	{
		1359	curpid = getpid ();
		1360	postfork = 1;
		1361	}
		1362	#endif
		1363
		1364	#if EV_FORK_ENABLE
		1365	/* we might have forked, so queue fork handlers */
		1366	if (expect_false (postfork))
		1367	if (forkcnt)
		1368	{
		1369	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1370	call_pending (EV_A);
		1371	}
		1372	#endif
		1373
		1374	/* queue check watchers (and execute them) */
		1375	if (expect_false (preparecnt))
539	{	1376	{
540	periodics_reschedule (ev_now - now);	1377	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
541		1378	call_pending (EV_A);
542	/* adjust timers. this is easy, as the offset is the same for all */
543	for (i = 0; i < timercnt; ++i)
544	timers [i]->at += diff;
545	}	1379	}
546		1380
547	now = ev_now;	1381	if (expect_false (!activecnt))
548	}	1382	break;
549	}
550		1383
551	int ev_loop_done;	1384	/* we might have forked, so reify kernel state if necessary */
		1385	if (expect_false (postfork))
		1386	loop_fork (EV_A);
552		1387
553	void ev_loop (int flags)
554	{
555	double block;
556	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
557
558	if (checkcnt)
559	{
560	queue_events ((W *)checks, checkcnt, EV_CHECK);
561	call_pending ();
562	}
563
564	do
565	{
566	/* update fd-related kernel structures */	1388	/* update fd-related kernel structures */
567	fd_reify ();	1389	fd_reify (EV_A);
568		1390
569	/* calculate blocking time */	1391	/* calculate blocking time */
		1392	{
		1393	ev_tstamp block;
570		1394
571	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1395	if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
572	ev_now = ev_time ();	1396	block = 0.; /* do not block at all */
573
574	if (flags & EVLOOP_NONBLOCK || idlecnt)
575	block = 0.;
576	else	1397	else
577	{	1398	{
		1399	/* update time to cancel out callback processing overhead */
		1400	#if EV_USE_MONOTONIC
		1401	if (expect_true (have_monotonic))
		1402	time_update_monotonic (EV_A);
		1403	else
		1404	#endif
		1405	{
		1406	ev_rt_now = ev_time ();
		1407	mn_now = ev_rt_now;
		1408	}
		1409
578	block = MAX_BLOCKTIME;	1410	block = MAX_BLOCKTIME;
579		1411
580	if (timercnt)	1412	if (timercnt)
581	{	1413	{
582	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1414	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
583	if (block > to) block = to;	1415	if (block > to) block = to;
584	}	1416	}
585		1417
		1418	#if EV_PERIODIC_ENABLE
586	if (periodiccnt)	1419	if (periodiccnt)
587	{	1420	{
588	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1421	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
589	if (block > to) block = to;	1422	if (block > to) block = to;
590	}	1423	}
		1424	#endif
591		1425
592	if (block < 0.) block = 0.;	1426	if (expect_false (block < 0.)) block = 0.;
593	}	1427	}
594		1428
595	method_poll (block);	1429	++loop_count;
		1430	backend_poll (EV_A_ block);
		1431	}
596		1432
597	/* update ev_now, do magic */	1433	/* update ev_rt_now, do magic */
598	time_update ();	1434	time_update (EV_A);
599		1435
600	/* queue pending timers and reschedule them */	1436	/* queue pending timers and reschedule them */
		1437	timers_reify (EV_A); /* relative timers called last */
		1438	#if EV_PERIODIC_ENABLE
601	periodics_reify (); /* absolute timers first */	1439	periodics_reify (EV_A); /* absolute timers called first */
602	timers_reify (); /* relative timers second */	1440	#endif
603		1441
604	/* queue idle watchers unless io or timers are pending */	1442	/* queue idle watchers unless other events are pending */
605	if (!pendingcnt)	1443	if (idlecnt && !any_pending (EV_A))
606	queue_events ((W *)idles, idlecnt, EV_IDLE);	1444	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
607		1445
608	/* queue check and possibly idle watchers */	1446	/* queue check watchers, to be executed first */
		1447	if (expect_false (checkcnt))
609	queue_events ((W *)checks, checkcnt, EV_CHECK);	1448	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
610		1449
611	call_pending ();	1450	call_pending (EV_A);
612	}
613	while (!ev_loop_done);
614		1451
615	if (ev_loop_done != 2)	1452	}
		1453	while (expect_true (activecnt && !loop_done));
		1454
		1455	if (loop_done == EVUNLOOP_ONE)
		1456	loop_done = EVUNLOOP_CANCEL;
		1457	}
		1458
		1459	void
		1460	ev_unloop (EV_P_ int how)
		1461	{
616	ev_loop_done = 0;	1462	loop_done = how;
617	}	1463	}
618		1464
619	/*****************************************************************************/	1465	/*****************************************************************************/
620		1466
621	static void	1467	void inline_size
622	wlist_add (WL *head, WL elem)	1468	wlist_add (WL *head, WL elem)
623	{	1469	{
624	elem->next = *head;	1470	elem->next = *head;
625	*head = elem;	1471	*head = elem;
626	}	1472	}
627		1473
628	static void	1474	void inline_size
629	wlist_del (WL *head, WL elem)	1475	wlist_del (WL *head, WL elem)
630	{	1476	{
631	while (*head)	1477	while (*head)
632	{	1478	{
633	if (*head == elem)	1479	if (*head == elem)
…		…
638		1484
639	head = &(*head)->next;	1485	head = &(*head)->next;
640	}	1486	}
641	}	1487	}
642		1488
643	static void	1489	void inline_speed
644	ev_clear (W w)	1490	ev_clear_pending (EV_P_ W w)
645	{	1491	{
646	if (w->pending)	1492	if (w->pending)
647	{	1493	{
648	pendings [w->pending - 1].w = 0;	1494	pendings [ABSPRI (w)][w->pending - 1].w = 0;
649	w->pending = 0;	1495	w->pending = 0;
650	}	1496	}
651	}	1497	}
652		1498
653	static void	1499	void inline_speed
654	ev_start (W w, int active)	1500	ev_start (EV_P_ W w, int active)
655	{	1501	{
		1502	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1503	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1504
656	w->active = active;	1505	w->active = active;
		1506	ev_ref (EV_A);
657	}	1507	}
658		1508
659	static void	1509	void inline_size
660	ev_stop (W w)	1510	ev_stop (EV_P_ W w)
661	{	1511	{
		1512	ev_unref (EV_A);
662	w->active = 0;	1513	w->active = 0;
663	}	1514	}
664		1515
665	/*****************************************************************************/	1516	/*****************************************************************************/
666		1517
667	void	1518	void
668	evio_start (struct ev_io *w)	1519	ev_io_start (EV_P_ ev_io *w)
669	{	1520	{
670	if (ev_is_active (w))
671	return;
672
673	int fd = w->fd;	1521	int fd = w->fd;
674		1522
		1523	if (expect_false (ev_is_active (w)))
		1524	return;
		1525
		1526	assert (("ev_io_start called with negative fd", fd >= 0));
		1527
675	ev_start ((W)w, 1);	1528	ev_start (EV_A_ (W)w, 1);
676	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1529	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
677	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1530	wlist_add ((WL *)&anfds[fd].head, (WL)w);
678		1531
679	++fdchangecnt;	1532	fd_change (EV_A_ fd);
680	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
681	fdchanges [fdchangecnt - 1] = fd;
682	}	1533	}
683		1534
684	void	1535	void
685	evio_stop (struct ev_io *w)	1536	ev_io_stop (EV_P_ ev_io *w)
686	{	1537	{
687	ev_clear ((W)w);	1538	ev_clear_pending (EV_A_ (W)w);
688	if (!ev_is_active (w))	1539	if (expect_false (!ev_is_active (w)))
689	return;	1540	return;
		1541
		1542	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
690		1543
691	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1544	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
692	ev_stop ((W)w);	1545	ev_stop (EV_A_ (W)w);
693		1546
694	++fdchangecnt;	1547	fd_change (EV_A_ w->fd);
695	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
696	fdchanges [fdchangecnt - 1] = w->fd;
697	}	1548	}
698		1549
699	void	1550	void
700	evtimer_start (struct ev_timer *w)	1551	ev_timer_start (EV_P_ ev_timer *w)
701	{	1552	{
702	if (ev_is_active (w))	1553	if (expect_false (ev_is_active (w)))
703	return;	1554	return;
704		1555
705	w->at += now;	1556	((WT)w)->at += mn_now;
706		1557
707	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1558	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
708		1559
709	ev_start ((W)w, ++timercnt);	1560	ev_start (EV_A_ (W)w, ++timercnt);
710	array_needsize (timers, timermax, timercnt, );	1561	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
711	timers [timercnt - 1] = w;	1562	timers [timercnt - 1] = w;
712	upheap ((WT *)timers, timercnt - 1);	1563	upheap ((WT *)timers, timercnt - 1);
713	}
714		1564
		1565	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1566	}
		1567
715	void	1568	void
716	evtimer_stop (struct ev_timer *w)	1569	ev_timer_stop (EV_P_ ev_timer *w)
717	{	1570	{
718	ev_clear ((W)w);	1571	ev_clear_pending (EV_A_ (W)w);
719	if (!ev_is_active (w))	1572	if (expect_false (!ev_is_active (w)))
720	return;	1573	return;
721		1574
722	if (w->active < timercnt--)	1575	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1576
		1577	{
		1578	int active = ((W)w)->active;
		1579
		1580	if (expect_true (--active < --timercnt))
723	{	1581	{
724	timers [w->active - 1] = timers [timercnt];	1582	timers [active] = timers [timercnt];
725	downheap ((WT *)timers, timercnt, w->active - 1);	1583	adjustheap ((WT *)timers, timercnt, active);
726	}	1584	}
		1585	}
727		1586
728	w->at = w->repeat;	1587	((WT)w)->at -= mn_now;
729		1588
730	ev_stop ((W)w);	1589	ev_stop (EV_A_ (W)w);
731	}	1590	}
732		1591
733	void	1592	void
734	evtimer_again (struct ev_timer *w)	1593	ev_timer_again (EV_P_ ev_timer *w)
735	{	1594	{
736	if (ev_is_active (w))	1595	if (ev_is_active (w))
737	{	1596	{
738	if (w->repeat)	1597	if (w->repeat)
739	{	1598	{
740	w->at = now + w->repeat;	1599	((WT)w)->at = mn_now + w->repeat;
741	downheap ((WT *)timers, timercnt, w->active - 1);	1600	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
742	}	1601	}
743	else	1602	else
744	evtimer_stop (w);	1603	ev_timer_stop (EV_A_ w);
745	}	1604	}
746	else if (w->repeat)	1605	else if (w->repeat)
		1606	{
		1607	w->at = w->repeat;
747	evtimer_start (w);	1608	ev_timer_start (EV_A_ w);
		1609	}
748	}	1610	}
749		1611
		1612	#if EV_PERIODIC_ENABLE
750	void	1613	void
751	evperiodic_start (struct ev_periodic *w)	1614	ev_periodic_start (EV_P_ ev_periodic *w)
752	{	1615	{
753	if (ev_is_active (w))	1616	if (expect_false (ev_is_active (w)))
754	return;	1617	return;
755		1618
756	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1619	if (w->reschedule_cb)
757		1620	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1621	else if (w->interval)
		1622	{
		1623	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
758	/* this formula differs from the one in periodic_reify because we do not always round up */	1624	/* this formula differs from the one in periodic_reify because we do not always round up */
759	if (w->interval)
760	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1625	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1626	}
761		1627
762	ev_start ((W)w, ++periodiccnt);	1628	ev_start (EV_A_ (W)w, ++periodiccnt);
763	array_needsize (periodics, periodicmax, periodiccnt, );	1629	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
764	periodics [periodiccnt - 1] = w;	1630	periodics [periodiccnt - 1] = w;
765	upheap ((WT *)periodics, periodiccnt - 1);	1631	upheap ((WT *)periodics, periodiccnt - 1);
766	}
767		1632
		1633	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1634	}
		1635
768	void	1636	void
769	evperiodic_stop (struct ev_periodic *w)	1637	ev_periodic_stop (EV_P_ ev_periodic *w)
770	{	1638	{
771	ev_clear ((W)w);	1639	ev_clear_pending (EV_A_ (W)w);
772	if (!ev_is_active (w))	1640	if (expect_false (!ev_is_active (w)))
773	return;	1641	return;
774		1642
775	if (w->active < periodiccnt--)	1643	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1644
		1645	{
		1646	int active = ((W)w)->active;
		1647
		1648	if (expect_true (--active < --periodiccnt))
776	{	1649	{
777	periodics [w->active - 1] = periodics [periodiccnt];	1650	periodics [active] = periodics [periodiccnt];
778	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1651	adjustheap ((WT *)periodics, periodiccnt, active);
779	}	1652	}
		1653	}
780		1654
781	ev_stop ((W)w);	1655	ev_stop (EV_A_ (W)w);
782	}	1656	}
783		1657
784	void	1658	void
		1659	ev_periodic_again (EV_P_ ev_periodic *w)
		1660	{
		1661	/* TODO: use adjustheap and recalculation */
		1662	ev_periodic_stop (EV_A_ w);
		1663	ev_periodic_start (EV_A_ w);
		1664	}
		1665	#endif
		1666
		1667	#ifndef SA_RESTART
		1668	# define SA_RESTART 0
		1669	#endif
		1670
		1671	void
785	evsignal_start (struct ev_signal *w)	1672	ev_signal_start (EV_P_ ev_signal *w)
786	{	1673	{
		1674	#if EV_MULTIPLICITY
		1675	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1676	#endif
787	if (ev_is_active (w))	1677	if (expect_false (ev_is_active (w)))
788	return;	1678	return;
789		1679
		1680	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1681
790	ev_start ((W)w, 1);	1682	ev_start (EV_A_ (W)w, 1);
791	array_needsize (signals, signalmax, w->signum, signals_init);	1683	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
792	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1684	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
793		1685
794	if (!w->next)	1686	if (!((WL)w)->next)
795	{	1687	{
		1688	#if _WIN32
		1689	signal (w->signum, sighandler);
		1690	#else
796	struct sigaction sa;	1691	struct sigaction sa;
797	sa.sa_handler = sighandler;	1692	sa.sa_handler = sighandler;
798	sigfillset (&sa.sa_mask);	1693	sigfillset (&sa.sa_mask);
799	sa.sa_flags = 0;	1694	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
800	sigaction (w->signum, &sa, 0);	1695	sigaction (w->signum, &sa, 0);
		1696	#endif
801	}	1697	}
802	}	1698	}
803		1699
804	void	1700	void
805	evsignal_stop (struct ev_signal *w)	1701	ev_signal_stop (EV_P_ ev_signal *w)
806	{	1702	{
807	ev_clear ((W)w);	1703	ev_clear_pending (EV_A_ (W)w);
808	if (!ev_is_active (w))	1704	if (expect_false (!ev_is_active (w)))
809	return;	1705	return;
810		1706
811	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1707	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
812	ev_stop ((W)w);	1708	ev_stop (EV_A_ (W)w);
813		1709
814	if (!signals [w->signum - 1].head)	1710	if (!signals [w->signum - 1].head)
815	signal (w->signum, SIG_DFL);	1711	signal (w->signum, SIG_DFL);
816	}	1712	}
817		1713
818	void evidle_start (struct ev_idle *w)	1714	void
		1715	ev_child_start (EV_P_ ev_child *w)
819	{	1716	{
		1717	#if EV_MULTIPLICITY
		1718	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1719	#endif
820	if (ev_is_active (w))	1720	if (expect_false (ev_is_active (w)))
821	return;	1721	return;
822		1722
		1723	ev_start (EV_A_ (W)w, 1);
		1724	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1725	}
		1726
		1727	void
		1728	ev_child_stop (EV_P_ ev_child *w)
		1729	{
		1730	ev_clear_pending (EV_A_ (W)w);
		1731	if (expect_false (!ev_is_active (w)))
		1732	return;
		1733
		1734	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1735	ev_stop (EV_A_ (W)w);
		1736	}
		1737
		1738	#if EV_STAT_ENABLE
		1739
		1740	# ifdef _WIN32
		1741	# undef lstat
		1742	# define lstat(a,b) _stati64 (a,b)
		1743	# endif
		1744
		1745	#define DEF_STAT_INTERVAL 5.0074891
		1746	#define MIN_STAT_INTERVAL 0.1074891
		1747
		1748	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1749
		1750	#if EV_USE_INOTIFY
		1751	# define EV_INOTIFY_BUFSIZE 8192
		1752
		1753	static void noinline
		1754	infy_add (EV_P_ ev_stat *w)
		1755	{
		1756	w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
		1757
		1758	if (w->wd < 0)
		1759	{
		1760	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1761
		1762	/* monitor some parent directory for speedup hints */
		1763	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1764	{
		1765	char path [4096];
		1766	strcpy (path, w->path);
		1767
		1768	do
		1769	{
		1770	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1771	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1772
		1773	char *pend = strrchr (path, '/');
		1774
		1775	if (!pend)
		1776	break; /* whoops, no '/', complain to your admin */
		1777
		1778	*pend = 0;
		1779	w->wd = inotify_add_watch (fs_fd, path, mask);
		1780	}
		1781	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1782	}
		1783	}
		1784	else
		1785	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1786
		1787	if (w->wd >= 0)
		1788	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1789	}
		1790
		1791	static void noinline
		1792	infy_del (EV_P_ ev_stat *w)
		1793	{
		1794	int slot;
		1795	int wd = w->wd;
		1796
		1797	if (wd < 0)
		1798	return;
		1799
		1800	w->wd = -2;
		1801	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1802	wlist_del (&fs_hash [slot].head, (WL)w);
		1803
		1804	/* remove this watcher, if others are watching it, they will rearm */
		1805	inotify_rm_watch (fs_fd, wd);
		1806	}
		1807
		1808	static void noinline
		1809	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1810	{
		1811	if (slot < 0)
		1812	/* overflow, need to check for all hahs slots */
		1813	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1814	infy_wd (EV_A_ slot, wd, ev);
		1815	else
		1816	{
		1817	WL w_;
		1818
		1819	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1820	{
		1821	ev_stat *w = (ev_stat *)w_;
		1822	w_ = w_->next; /* lets us remove this watcher and all before it */
		1823
		1824	if (w->wd == wd || wd == -1)
		1825	{
		1826	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1827	{
		1828	w->wd = -1;
		1829	infy_add (EV_A_ w); /* re-add, no matter what */
		1830	}
		1831
		1832	stat_timer_cb (EV_A_ &w->timer, 0);
		1833	}
		1834	}
		1835	}
		1836	}
		1837
		1838	static void
		1839	infy_cb (EV_P_ ev_io *w, int revents)
		1840	{
		1841	char buf [EV_INOTIFY_BUFSIZE];
		1842	struct inotify_event *ev = (struct inotify_event *)buf;
		1843	int ofs;
		1844	int len = read (fs_fd, buf, sizeof (buf));
		1845
		1846	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1847	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1848	}
		1849
		1850	void inline_size
		1851	infy_init (EV_P)
		1852	{
		1853	if (fs_fd != -2)
		1854	return;
		1855
		1856	fs_fd = inotify_init ();
		1857
		1858	if (fs_fd >= 0)
		1859	{
		1860	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1861	ev_set_priority (&fs_w, EV_MAXPRI);
		1862	ev_io_start (EV_A_ &fs_w);
		1863	}
		1864	}
		1865
		1866	void inline_size
		1867	infy_fork (EV_P)
		1868	{
		1869	int slot;
		1870
		1871	if (fs_fd < 0)
		1872	return;
		1873
		1874	close (fs_fd);
		1875	fs_fd = inotify_init ();
		1876
		1877	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1878	{
		1879	WL w_ = fs_hash [slot].head;
		1880	fs_hash [slot].head = 0;
		1881
		1882	while (w_)
		1883	{
		1884	ev_stat *w = (ev_stat *)w_;
		1885	w_ = w_->next; /* lets us add this watcher */
		1886
		1887	w->wd = -1;
		1888
		1889	if (fs_fd >= 0)
		1890	infy_add (EV_A_ w); /* re-add, no matter what */
		1891	else
		1892	ev_timer_start (EV_A_ &w->timer);
		1893	}
		1894
		1895	}
		1896	}
		1897
		1898	#endif
		1899
		1900	void
		1901	ev_stat_stat (EV_P_ ev_stat *w)
		1902	{
		1903	if (lstat (w->path, &w->attr) < 0)
		1904	w->attr.st_nlink = 0;
		1905	else if (!w->attr.st_nlink)
		1906	w->attr.st_nlink = 1;
		1907	}
		1908
		1909	static void noinline
		1910	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1911	{
		1912	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1913
		1914	/* we copy this here each the time so that */
		1915	/* prev has the old value when the callback gets invoked */
		1916	w->prev = w->attr;
		1917	ev_stat_stat (EV_A_ w);
		1918
		1919	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		1920	if (
		1921	w->prev.st_dev != w->attr.st_dev
		1922	|| w->prev.st_ino != w->attr.st_ino
		1923	|| w->prev.st_mode != w->attr.st_mode
		1924	|| w->prev.st_nlink != w->attr.st_nlink
		1925	|| w->prev.st_uid != w->attr.st_uid
		1926	|| w->prev.st_gid != w->attr.st_gid
		1927	|| w->prev.st_rdev != w->attr.st_rdev
		1928	|| w->prev.st_size != w->attr.st_size
		1929	|| w->prev.st_atime != w->attr.st_atime
		1930	|| w->prev.st_mtime != w->attr.st_mtime
		1931	|| w->prev.st_ctime != w->attr.st_ctime
		1932	) {
		1933	#if EV_USE_INOTIFY
		1934	infy_del (EV_A_ w);
		1935	infy_add (EV_A_ w);
		1936	ev_stat_stat (EV_A_ w); /* avoid race... */
		1937	#endif
		1938
		1939	ev_feed_event (EV_A_ w, EV_STAT);
		1940	}
		1941	}
		1942
		1943	void
		1944	ev_stat_start (EV_P_ ev_stat *w)
		1945	{
		1946	if (expect_false (ev_is_active (w)))
		1947	return;
		1948
		1949	/* since we use memcmp, we need to clear any padding data etc. */
		1950	memset (&w->prev, 0, sizeof (ev_statdata));
		1951	memset (&w->attr, 0, sizeof (ev_statdata));
		1952
		1953	ev_stat_stat (EV_A_ w);
		1954
		1955	if (w->interval < MIN_STAT_INTERVAL)
		1956	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		1957
		1958	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1959	ev_set_priority (&w->timer, ev_priority (w));
		1960
		1961	#if EV_USE_INOTIFY
		1962	infy_init (EV_A);
		1963
		1964	if (fs_fd >= 0)
		1965	infy_add (EV_A_ w);
		1966	else
		1967	#endif
		1968	ev_timer_start (EV_A_ &w->timer);
		1969
		1970	ev_start (EV_A_ (W)w, 1);
		1971	}
		1972
		1973	void
		1974	ev_stat_stop (EV_P_ ev_stat *w)
		1975	{
		1976	ev_clear_pending (EV_A_ (W)w);
		1977	if (expect_false (!ev_is_active (w)))
		1978	return;
		1979
		1980	#if EV_USE_INOTIFY
		1981	infy_del (EV_A_ w);
		1982	#endif
		1983	ev_timer_stop (EV_A_ &w->timer);
		1984
		1985	ev_stop (EV_A_ (W)w);
		1986	}
		1987	#endif
		1988
		1989	void
		1990	ev_idle_start (EV_P_ ev_idle *w)
		1991	{
		1992	if (expect_false (ev_is_active (w)))
		1993	return;
		1994
823	ev_start ((W)w, ++idlecnt);	1995	ev_start (EV_A_ (W)w, ++idlecnt);
824	array_needsize (idles, idlemax, idlecnt, );	1996	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
825	idles [idlecnt - 1] = w;	1997	idles [idlecnt - 1] = w;
826	}	1998	}
827		1999
828	void evidle_stop (struct ev_idle *w)	2000	void
		2001	ev_idle_stop (EV_P_ ev_idle *w)
829	{	2002	{
830	ev_clear ((W)w);	2003	ev_clear_pending (EV_A_ (W)w);
831	if (ev_is_active (w))	2004	if (expect_false (!ev_is_active (w)))
832	return;	2005	return;
833		2006
		2007	{
		2008	int active = ((W)w)->active;
834	idles [w->active - 1] = idles [--idlecnt];	2009	idles [active - 1] = idles [--idlecnt];
		2010	((W)idles [active - 1])->active = active;
		2011	}
		2012
835	ev_stop ((W)w);	2013	ev_stop (EV_A_ (W)w);
836	}	2014	}
837		2015
		2016	void
		2017	ev_prepare_start (EV_P_ ev_prepare *w)
		2018	{
		2019	if (expect_false (ev_is_active (w)))
		2020	return;
		2021
		2022	ev_start (EV_A_ (W)w, ++preparecnt);
		2023	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2024	prepares [preparecnt - 1] = w;
		2025	}
		2026
		2027	void
		2028	ev_prepare_stop (EV_P_ ev_prepare *w)
		2029	{
		2030	ev_clear_pending (EV_A_ (W)w);
		2031	if (expect_false (!ev_is_active (w)))
		2032	return;
		2033
		2034	{
		2035	int active = ((W)w)->active;
		2036	prepares [active - 1] = prepares [--preparecnt];
		2037	((W)prepares [active - 1])->active = active;
		2038	}
		2039
		2040	ev_stop (EV_A_ (W)w);
		2041	}
		2042
		2043	void
838	void evcheck_start (struct ev_check *w)	2044	ev_check_start (EV_P_ ev_check *w)
839	{	2045	{
840	if (ev_is_active (w))	2046	if (expect_false (ev_is_active (w)))
841	return;	2047	return;
842		2048
843	ev_start ((W)w, ++checkcnt);	2049	ev_start (EV_A_ (W)w, ++checkcnt);
844	array_needsize (checks, checkmax, checkcnt, );	2050	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
845	checks [checkcnt - 1] = w;	2051	checks [checkcnt - 1] = w;
846	}	2052	}
847		2053
		2054	void
848	void evcheck_stop (struct ev_check *w)	2055	ev_check_stop (EV_P_ ev_check *w)
849	{	2056	{
850	ev_clear ((W)w);	2057	ev_clear_pending (EV_A_ (W)w);
851	if (ev_is_active (w))	2058	if (expect_false (!ev_is_active (w)))
852	return;	2059	return;
853		2060
		2061	{
		2062	int active = ((W)w)->active;
854	checks [w->active - 1] = checks [--checkcnt];	2063	checks [active - 1] = checks [--checkcnt];
		2064	((W)checks [active - 1])->active = active;
		2065	}
		2066
855	ev_stop ((W)w);	2067	ev_stop (EV_A_ (W)w);
856	}	2068	}
		2069
		2070	#if EV_EMBED_ENABLE
		2071	void noinline
		2072	ev_embed_sweep (EV_P_ ev_embed *w)
		2073	{
		2074	ev_loop (w->loop, EVLOOP_NONBLOCK);
		2075	}
		2076
		2077	static void
		2078	embed_cb (EV_P_ ev_io *io, int revents)
		2079	{
		2080	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		2081
		2082	if (ev_cb (w))
		2083	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		2084	else
		2085	ev_embed_sweep (loop, w);
		2086	}
		2087
		2088	void
		2089	ev_embed_start (EV_P_ ev_embed *w)
		2090	{
		2091	if (expect_false (ev_is_active (w)))
		2092	return;
		2093
		2094	{
		2095	struct ev_loop *loop = w->loop;
		2096	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		2097	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		2098	}
		2099
		2100	ev_set_priority (&w->io, ev_priority (w));
		2101	ev_io_start (EV_A_ &w->io);
		2102
		2103	ev_start (EV_A_ (W)w, 1);
		2104	}
		2105
		2106	void
		2107	ev_embed_stop (EV_P_ ev_embed *w)
		2108	{
		2109	ev_clear_pending (EV_A_ (W)w);
		2110	if (expect_false (!ev_is_active (w)))
		2111	return;
		2112
		2113	ev_io_stop (EV_A_ &w->io);
		2114
		2115	ev_stop (EV_A_ (W)w);
		2116	}
		2117	#endif
		2118
		2119	#if EV_FORK_ENABLE
		2120	void
		2121	ev_fork_start (EV_P_ ev_fork *w)
		2122	{
		2123	if (expect_false (ev_is_active (w)))
		2124	return;
		2125
		2126	ev_start (EV_A_ (W)w, ++forkcnt);
		2127	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2128	forks [forkcnt - 1] = w;
		2129	}
		2130
		2131	void
		2132	ev_fork_stop (EV_P_ ev_fork *w)
		2133	{
		2134	ev_clear_pending (EV_A_ (W)w);
		2135	if (expect_false (!ev_is_active (w)))
		2136	return;
		2137
		2138	{
		2139	int active = ((W)w)->active;
		2140	forks [active - 1] = forks [--forkcnt];
		2141	((W)forks [active - 1])->active = active;
		2142	}
		2143
		2144	ev_stop (EV_A_ (W)w);
		2145	}
		2146	#endif
857		2147
858	/*****************************************************************************/	2148	/*****************************************************************************/
859		2149
860	struct ev_once	2150	struct ev_once
861	{	2151	{
862	struct ev_io io;	2152	ev_io io;
863	struct ev_timer to;	2153	ev_timer to;
864	void (*cb)(int revents, void *arg);	2154	void (*cb)(int revents, void *arg);
865	void *arg;	2155	void *arg;
866	};	2156	};
867		2157
868	static void	2158	static void
869	once_cb (struct ev_once *once, int revents)	2159	once_cb (EV_P_ struct ev_once *once, int revents)
870	{	2160	{
871	void (*cb)(int revents, void *arg) = once->cb;	2161	void (*cb)(int revents, void *arg) = once->cb;
872	void *arg = once->arg;	2162	void *arg = once->arg;
873		2163
874	evio_stop (&once->io);	2164	ev_io_stop (EV_A_ &once->io);
875	evtimer_stop (&once->to);	2165	ev_timer_stop (EV_A_ &once->to);
876	free (once);	2166	ev_free (once);
877		2167
878	cb (revents, arg);	2168	cb (revents, arg);
879	}	2169	}
880		2170
881	static void	2171	static void
882	once_cb_io (struct ev_io *w, int revents)	2172	once_cb_io (EV_P_ ev_io *w, int revents)
883	{	2173	{
884	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	2174	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
885	}	2175	}
886		2176
887	static void	2177	static void
888	once_cb_to (struct ev_timer *w, int revents)	2178	once_cb_to (EV_P_ ev_timer *w, int revents)
889	{	2179	{
890	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	2180	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
891	}	2181	}
892		2182
893	void	2183	void
894	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	2184	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
895	{	2185	{
896	struct ev_once *once = malloc (sizeof (struct ev_once));	2186	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
897		2187
898	if (!once)	2188	if (expect_false (!once))
899	cb (EV_ERROR, arg);	2189	{
900	else	2190	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		2191	return;
901	{	2192	}
		2193
902	once->cb = cb;	2194	once->cb = cb;
903	once->arg = arg;	2195	once->arg = arg;
904		2196
905	evw_init (&once->io, once_cb_io);	2197	ev_init (&once->io, once_cb_io);
906
907	if (fd >= 0)	2198	if (fd >= 0)
908	{	2199	{
909	evio_set (&once->io, fd, events);	2200	ev_io_set (&once->io, fd, events);
910	evio_start (&once->io);	2201	ev_io_start (EV_A_ &once->io);
911	}	2202	}
912		2203
913	evw_init (&once->to, once_cb_to);	2204	ev_init (&once->to, once_cb_to);
914
915	if (timeout >= 0.)	2205	if (timeout >= 0.)
916	{	2206	{
917	evtimer_set (&once->to, timeout, 0.);	2207	ev_timer_set (&once->to, timeout, 0.);
918	evtimer_start (&once->to);	2208	ev_timer_start (EV_A_ &once->to);
919	}
920	}
921	}
922
923	/*****************************************************************************/
924
925	#if 0
926
927	struct ev_io wio;
928
929	static void
930	sin_cb (struct ev_io *w, int revents)
931	{
932	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
933	}
934
935	static void
936	ocb (struct ev_timer *w, int revents)
937	{
938	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
939	evtimer_stop (w);
940	evtimer_start (w);
941	}
942
943	static void
944	scb (struct ev_signal *w, int revents)
945	{
946	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
947	evio_stop (&wio);
948	evio_start (&wio);
949	}
950
951	static void
952	gcb (struct ev_signal *w, int revents)
953	{
954	fprintf (stderr, "generic %x\n", revents);
955
956	}
957
958	int main (void)
959	{
960	ev_init (0);
961
962	evio_init (&wio, sin_cb, 0, EV_READ);
963	evio_start (&wio);
964
965	struct ev_timer t[10000];
966
967	#if 0
968	int i;
969	for (i = 0; i < 10000; ++i)
970	{	2209	}
971	struct ev_timer *w = t + i;
972	evw_init (w, ocb, i);
973	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
974	evtimer_start (w);
975	if (drand48 () < 0.5)
976	evtimer_stop (w);
977	}
978	#endif
979
980	struct ev_timer t1;
981	evtimer_init (&t1, ocb, 5, 10);
982	evtimer_start (&t1);
983
984	struct ev_signal sig;
985	evsignal_init (&sig, scb, SIGQUIT);
986	evsignal_start (&sig);
987
988	struct ev_check cw;
989	evcheck_init (&cw, gcb);
990	evcheck_start (&cw);
991
992	struct ev_idle iw;
993	evidle_init (&iw, gcb);
994	evidle_start (&iw);
995
996	ev_loop (0);
997
998	return 0;
999	}	2210	}
1000		2211
		2212	#ifdef __cplusplus
		2213	}
1001	#endif	2214	#endif
1002		2215
1003
1004
1005

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