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Comparing libev/ev.c (file contents):
Revision 1.23 by root, Wed Oct 31 20:10:17 2007 UTC vs.
Revision 1.156 by root, Wed Nov 28 17:50:13 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/types.h>	118	#include <sys/types.h>
42	#include <sys/wait.h>
43	#include <sys/time.h>
44	#include <time.h>	119	#include <time.h>
45		120
46	#ifndef HAVE_MONOTONIC	121	#include <signal.h>
47	# ifdef CLOCK_MONOTONIC	122
48	# 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
49	# endif	138	# endif
50	#endif	139	#endif
51		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
52	#ifndef HAVE_SELECT	151	#ifndef EV_USE_SELECT
53	# 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
54	#endif	160	# endif
		161	#endif
55		162
56	#ifndef HAVE_EPOLL	163	#ifndef EV_USE_EPOLL
57	# 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
58	#endif	184	# endif
		185	#endif
59		186
60	#ifndef HAVE_REALTIME	187	#ifndef EV_INOTIFY_HASHSIZE
61	# 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
62	#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	/**/
63		220
64	#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) */
65	#define MAX_BLOCKTIME 60.	222	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
66	#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */	223	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
67		224
68	#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
69		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
70	typedef struct ev_watcher *W;	251	typedef ev_watcher *W;
71	typedef struct ev_watcher_list *WL;	252	typedef ev_watcher_list *WL;
72	typedef struct ev_watcher_time *WT;	253	typedef ev_watcher_time *WT;
73		254
74	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
75	ev_tstamp ev_now;	353	ev_tstamp ev_rt_now;
76	int ev_method;	354	#define VAR(name,decl) static decl;
		355	#include "ev_vars.h"
		356	#undef VAR
77		357
78	static int have_monotonic; /* runtime */	358	static int ev_default_loop_ptr;
79		359
80	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	360	#endif
81	static void (*method_modify)(int fd, int oev, int nev);
82	static void (*method_poll)(ev_tstamp timeout);
83		361
84	/*****************************************************************************/	362	/*****************************************************************************/
85		363
86	ev_tstamp	364	ev_tstamp
87	ev_time (void)	365	ev_time (void)
88	{	366	{
89	#if HAVE_REALTIME	367	#if EV_USE_REALTIME
90	struct timespec ts;	368	struct timespec ts;
91	clock_gettime (CLOCK_REALTIME, &ts);	369	clock_gettime (CLOCK_REALTIME, &ts);
92	return ts.tv_sec + ts.tv_nsec * 1e-9;	370	return ts.tv_sec + ts.tv_nsec * 1e-9;
93	#else	371	#else
94	struct timeval tv;	372	struct timeval tv;
95	gettimeofday (&tv, 0);	373	gettimeofday (&tv, 0);
96	return tv.tv_sec + tv.tv_usec * 1e-6;	374	return tv.tv_sec + tv.tv_usec * 1e-6;
97	#endif	375	#endif
98	}	376	}
99		377
100	static ev_tstamp	378	ev_tstamp inline_size
101	get_clock (void)	379	get_clock (void)
102	{	380	{
103	#if HAVE_MONOTONIC	381	#if EV_USE_MONOTONIC
104	if (have_monotonic)	382	if (expect_true (have_monotonic))
105	{	383	{
106	struct timespec ts;	384	struct timespec ts;
107	clock_gettime (CLOCK_MONOTONIC, &ts);	385	clock_gettime (CLOCK_MONOTONIC, &ts);
108	return ts.tv_sec + ts.tv_nsec * 1e-9;	386	return ts.tv_sec + ts.tv_nsec * 1e-9;
109	}	387	}
110	#endif	388	#endif
111		389
112	return ev_time ();	390	return ev_time ();
113	}	391	}
114		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
115	#define array_needsize(base,cur,cnt,init) \	403	#define array_needsize(type,base,cur,cnt,init) \
116	if ((cnt) > cur) \	404	if (expect_false ((cnt) > cur)) \
117	{ \	405	{ \
118	int newcnt = cur; \	406	int newcnt = cur; \
119	do \	407	do \
120	{ \	408	{ \
121	newcnt = (newcnt << 1) | 4 & ~3; \	409	newcnt = array_roundsize (type, newcnt << 1); \
122	} \	410	} \
123	while ((cnt) > newcnt); \	411	while ((cnt) > newcnt); \
124	\	412	\
125	base = realloc (base, sizeof (*base) * (newcnt)); \	413	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
126	init (base + cur, newcnt - cur); \	414	init (base + cur, newcnt - cur); \
127	cur = newcnt; \	415	cur = newcnt; \
128	}	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;
129		428
130	/*****************************************************************************/	429	/*****************************************************************************/
131		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	/* this should be highly optimised to not do anything but set a flag */
		595	for (fd = 0; fd < anfdmax; ++fd)
		596	if (anfds [fd].events)
		597	{
		598	anfds [fd].events = 0;
		599	fd_change (EV_A_ fd);
		600	}
		601	}
		602
		603	/*****************************************************************************/
		604
		605	void inline_speed
		606	upheap (WT *heap, int k)
		607	{
		608	WT w = heap [k];
		609
		610	while (k && heap [k >> 1]->at > w->at)
		611	{
		612	heap [k] = heap [k >> 1];
		613	((W)heap [k])->active = k + 1;
		614	k >>= 1;
		615	}
		616
		617	heap [k] = w;
		618	((W)heap [k])->active = k + 1;
		619
		620	}
		621
		622	void inline_speed
		623	downheap (WT *heap, int N, int k)
		624	{
		625	WT w = heap [k];
		626
		627	while (k < (N >> 1))
		628	{
		629	int j = k << 1;
		630
		631	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		632	++j;
		633
		634	if (w->at <= heap [j]->at)
		635	break;
		636
		637	heap [k] = heap [j];
		638	((W)heap [k])->active = k + 1;
		639	k = j;
		640	}
		641
		642	heap [k] = w;
		643	((W)heap [k])->active = k + 1;
		644	}
		645
		646	void inline_size
		647	adjustheap (WT *heap, int N, int k)
		648	{
		649	upheap (heap, k);
		650	downheap (heap, N, k);
		651	}
		652
		653	/*****************************************************************************/
		654
132	typedef struct	655	typedef struct
133	{	656	{
134	struct ev_io *head;	657	WL head;
135	unsigned char wev, rev; /* want, received event set */
136	} ANFD;
137
138	static ANFD *anfds;
139	static int anfdmax;
140
141	static int *fdchanges;
142	static int fdchangemax, fdchangecnt;
143
144	static void
145	anfds_init (ANFD *base, int count)
146	{
147	while (count--)
148	{
149	base->head = 0;
150	base->wev = base->rev = EV_NONE;
151	++base;
152	}
153	}
154
155	typedef struct
156	{
157	W w;
158	int events;
159	} ANPENDING;
160
161	static ANPENDING *pendings;
162	static int pendingmax, pendingcnt;
163
164	static void
165	event (W w, int events)
166	{
167	if (w->active)
168	{
169	w->pending = ++pendingcnt;
170	array_needsize (pendings, pendingmax, pendingcnt, );
171	pendings [pendingcnt - 1].w = w;
172	pendings [pendingcnt - 1].events = events;
173	}
174	}
175
176	static void
177	fd_event (int fd, int events)
178	{
179	ANFD *anfd = anfds + fd;
180	struct ev_io *w;
181
182	for (w = anfd->head; w; w = w->next)
183	{
184	int ev = w->events & events;
185
186	if (ev)
187	event ((W)w, ev);
188	}
189	}
190
191	static void
192	queue_events (W *events, int eventcnt, int type)
193	{
194	int i;
195
196	for (i = 0; i < eventcnt; ++i)
197	event (events [i], type);
198	}
199
200	/* called on EBADF to verify fds */
201	static void
202	fd_recheck ()
203	{
204	int fd;
205
206	for (fd = 0; fd < anfdmax; ++fd)
207	if (anfds [fd].wev)
208	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
209	while (anfds [fd].head)
210	evio_stop (anfds [fd].head);
211	}
212
213	/*****************************************************************************/
214
215	static struct ev_timer **timers;
216	static int timermax, timercnt;
217
218	static struct ev_periodic **periodics;
219	static int periodicmax, periodiccnt;
220
221	static void
222	upheap (WT *timers, int k)
223	{
224	WT w = timers [k];
225
226	while (k && timers [k >> 1]->at > w->at)
227	{
228	timers [k] = timers [k >> 1];
229	timers [k]->active = k + 1;
230	k >>= 1;
231	}
232
233	timers [k] = w;
234	timers [k]->active = k + 1;
235
236	}
237
238	static void
239	downheap (WT *timers, int N, int k)
240	{
241	WT w = timers [k];
242
243	while (k < (N >> 1))
244	{
245	int j = k << 1;
246
247	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
248	++j;
249
250	if (w->at <= timers [j]->at)
251	break;
252
253	timers [k] = timers [j];
254	timers [k]->active = k + 1;
255	k = j;
256	}
257
258	timers [k] = w;
259	timers [k]->active = k + 1;
260	}
261
262	/*****************************************************************************/
263
264	typedef struct
265	{
266	struct ev_signal *head;
267	sig_atomic_t gotsig;	658	sig_atomic_t volatile gotsig;
268	} ANSIG;	659	} ANSIG;
269		660
270	static ANSIG *signals;	661	static ANSIG *signals;
271	static int signalmax;	662	static int signalmax;
272		663
273	static int sigpipe [2];	664	static int sigpipe [2];
274	static sig_atomic_t gotsig;	665	static sig_atomic_t volatile gotsig;
275	static struct ev_io sigev;	666	static ev_io sigev;
276		667
277	static void	668	void inline_size
278	signals_init (ANSIG *base, int count)	669	signals_init (ANSIG *base, int count)
279	{	670	{
280	while (count--)	671	while (count--)
281	{	672	{
282	base->head = 0;	673	base->head = 0;
283	base->gotsig = 0;	674	base->gotsig = 0;
		675
284	++base;	676	++base;
285	}	677	}
286	}	678	}
287		679
288	static void	680	static void
289	sighandler (int signum)	681	sighandler (int signum)
290	{	682	{
		683	#if _WIN32
		684	signal (signum, sighandler);
		685	#endif
		686
291	signals [signum - 1].gotsig = 1;	687	signals [signum - 1].gotsig = 1;
292		688
293	if (!gotsig)	689	if (!gotsig)
294	{	690	{
		691	int old_errno = errno;
295	gotsig = 1;	692	gotsig = 1;
296	write (sigpipe [1], &gotsig, 1);	693	write (sigpipe [1], &signum, 1);
		694	errno = old_errno;
297	}	695	}
		696	}
		697
		698	void noinline
		699	ev_feed_signal_event (EV_P_ int signum)
		700	{
		701	WL w;
		702
		703	#if EV_MULTIPLICITY
		704	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		705	#endif
		706
		707	--signum;
		708
		709	if (signum < 0 || signum >= signalmax)
		710	return;
		711
		712	signals [signum].gotsig = 0;
		713
		714	for (w = signals [signum].head; w; w = w->next)
		715	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
298	}	716	}
299		717
300	static void	718	static void
301	sigcb (struct ev_io *iow, int revents)	719	sigcb (EV_P_ ev_io *iow, int revents)
302	{	720	{
303	struct ev_signal *w;
304	int sig;	721	int signum;
305		722
		723	read (sigpipe [0], &revents, 1);
306	gotsig = 0;	724	gotsig = 0;
307	read (sigpipe [0], &revents, 1);
308		725
309	for (sig = signalmax; sig--; )	726	for (signum = signalmax; signum--; )
310	if (signals [sig].gotsig)	727	if (signals [signum].gotsig)
		728	ev_feed_signal_event (EV_A_ signum + 1);
		729	}
		730
		731	void inline_size
		732	fd_intern (int fd)
		733	{
		734	#ifdef _WIN32
		735	int arg = 1;
		736	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		737	#else
		738	fcntl (fd, F_SETFD, FD_CLOEXEC);
		739	fcntl (fd, F_SETFL, O_NONBLOCK);
		740	#endif
		741	}
		742
		743	static void noinline
		744	siginit (EV_P)
		745	{
		746	fd_intern (sigpipe [0]);
		747	fd_intern (sigpipe [1]);
		748
		749	ev_io_set (&sigev, sigpipe [0], EV_READ);
		750	ev_io_start (EV_A_ &sigev);
		751	ev_unref (EV_A); /* child watcher should not keep loop alive */
		752	}
		753
		754	/*****************************************************************************/
		755
		756	static ev_child *childs [EV_PID_HASHSIZE];
		757
		758	#ifndef _WIN32
		759
		760	static ev_signal childev;
		761
		762	void inline_speed
		763	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		764	{
		765	ev_child *w;
		766
		767	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		768	if (w->pid == pid || !w->pid)
311	{	769	{
312	signals [sig].gotsig = 0;	770	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
313		771	w->rpid = pid;
314	for (w = signals [sig].head; w; w = w->next)	772	w->rstatus = status;
315	event ((W)w, EV_SIGNAL);	773	ev_feed_event (EV_A_ (W)w, EV_CHILD);
316	}	774	}
317	}	775	}
318
319	static void
320	siginit (void)
321	{
322	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
323	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
324
325	/* rather than sort out wether we really need nb, set it */
326	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
327	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
328
329	evio_set (&sigev, sigpipe [0], EV_READ);
330	evio_start (&sigev);
331	}
332
333	/*****************************************************************************/
334
335	static struct ev_idle **idles;
336	static int idlemax, idlecnt;
337
338	static struct ev_prepare **prepares;
339	static int preparemax, preparecnt;
340
341	static struct ev_check **checks;
342	static int checkmax, checkcnt;
343
344	/*****************************************************************************/
345
346	static struct ev_child *childs [PID_HASHSIZE];
347	static struct ev_signal childev;
348		776
349	#ifndef WCONTINUED	777	#ifndef WCONTINUED
350	# define WCONTINUED 0	778	# define WCONTINUED 0
351	#endif	779	#endif
352		780
353	static void	781	static void
354	childcb (struct ev_signal *sw, int revents)	782	childcb (EV_P_ ev_signal *sw, int revents)
355	{	783	{
356	struct ev_child *w;
357	int pid, status;	784	int pid, status;
358		785
		786	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
359	while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)	787	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
360	for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)	788	if (!WCONTINUED
361	if (w->pid == pid || w->pid == -1)	789	|| errno != EINVAL
362	{	790	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
363	w->status = status;	791	return;
364	event ((W)w, EV_CHILD);	792
365	}	793	/* make sure we are called again until all childs have been reaped */
		794	/* we need to do it this way so that the callback gets called before we continue */
		795	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		796
		797	child_reap (EV_A_ sw, pid, pid, status);
		798	if (EV_PID_HASHSIZE > 1)
		799	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
366	}	800	}
		801
		802	#endif
367		803
368	/*****************************************************************************/	804	/*****************************************************************************/
369		805
		806	#if EV_USE_PORT
		807	# include "ev_port.c"
		808	#endif
		809	#if EV_USE_KQUEUE
		810	# include "ev_kqueue.c"
		811	#endif
370	#if HAVE_EPOLL	812	#if EV_USE_EPOLL
371	# include "ev_epoll.c"	813	# include "ev_epoll.c"
372	#endif	814	#endif
		815	#if EV_USE_POLL
		816	# include "ev_poll.c"
		817	#endif
373	#if HAVE_SELECT	818	#if EV_USE_SELECT
374	# include "ev_select.c"	819	# include "ev_select.c"
375	#endif	820	#endif
376		821
377	int ev_init (int flags)	822	int
		823	ev_version_major (void)
378	{	824	{
379	if (!ev_method)	825	return EV_VERSION_MAJOR;
		826	}
		827
		828	int
		829	ev_version_minor (void)
		830	{
		831	return EV_VERSION_MINOR;
		832	}
		833
		834	/* return true if we are running with elevated privileges and should ignore env variables */
		835	int inline_size
		836	enable_secure (void)
		837	{
		838	#ifdef _WIN32
		839	return 0;
		840	#else
		841	return getuid () != geteuid ()
		842	|| getgid () != getegid ();
		843	#endif
		844	}
		845
		846	unsigned int
		847	ev_supported_backends (void)
		848	{
		849	unsigned int flags = 0;
		850
		851	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		852	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		853	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		854	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		855	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		856
		857	return flags;
		858	}
		859
		860	unsigned int
		861	ev_recommended_backends (void)
		862	{
		863	unsigned int flags = ev_supported_backends ();
		864
		865	#ifndef __NetBSD__
		866	/* kqueue is borked on everything but netbsd apparently */
		867	/* it usually doesn't work correctly on anything but sockets and pipes */
		868	flags &= ~EVBACKEND_KQUEUE;
		869	#endif
		870	#ifdef __APPLE__
		871	// flags &= ~EVBACKEND_KQUEUE; for documentation
		872	flags &= ~EVBACKEND_POLL;
		873	#endif
		874
		875	return flags;
		876	}
		877
		878	unsigned int
		879	ev_embeddable_backends (void)
		880	{
		881	return EVBACKEND_EPOLL
		882	| EVBACKEND_KQUEUE
		883	| EVBACKEND_PORT;
		884	}
		885
		886	unsigned int
		887	ev_backend (EV_P)
		888	{
		889	return backend;
		890	}
		891
		892	static void noinline
		893	loop_init (EV_P_ unsigned int flags)
		894	{
		895	if (!backend)
380	{	896	{
381	#if HAVE_MONOTONIC	897	#if EV_USE_MONOTONIC
382	{	898	{
383	struct timespec ts;	899	struct timespec ts;
384	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	900	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
385	have_monotonic = 1;	901	have_monotonic = 1;
386	}	902	}
387	#endif	903	#endif
388		904
389	ev_now = ev_time ();	905	ev_rt_now = ev_time ();
390	now = get_clock ();	906	mn_now = get_clock ();
		907	now_floor = mn_now;
391	diff = ev_now - now;	908	rtmn_diff = ev_rt_now - mn_now;
392		909
		910	if (!(flags & EVFLAG_NOENV)
		911	&& !enable_secure ()
		912	&& getenv ("LIBEV_FLAGS"))
		913	flags = atoi (getenv ("LIBEV_FLAGS"));
		914
		915	if (!(flags & 0x0000ffffUL))
		916	flags |= ev_recommended_backends ();
		917
		918	backend = 0;
		919	backend_fd = -1;
		920	#if EV_USE_INOTIFY
		921	fs_fd = -2;
		922	#endif
		923
		924	#if EV_USE_PORT
		925	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		926	#endif
		927	#if EV_USE_KQUEUE
		928	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		929	#endif
		930	#if EV_USE_EPOLL
		931	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
		932	#endif
		933	#if EV_USE_POLL
		934	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		935	#endif
		936	#if EV_USE_SELECT
		937	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
		938	#endif
		939
		940	ev_init (&sigev, sigcb);
		941	ev_set_priority (&sigev, EV_MAXPRI);
		942	}
		943	}
		944
		945	static void noinline
		946	loop_destroy (EV_P)
		947	{
		948	int i;
		949
		950	#if EV_USE_INOTIFY
		951	if (fs_fd >= 0)
		952	close (fs_fd);
		953	#endif
		954
		955	if (backend_fd >= 0)
		956	close (backend_fd);
		957
		958	#if EV_USE_PORT
		959	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		960	#endif
		961	#if EV_USE_KQUEUE
		962	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		963	#endif
		964	#if EV_USE_EPOLL
		965	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		966	#endif
		967	#if EV_USE_POLL
		968	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		969	#endif
		970	#if EV_USE_SELECT
		971	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		972	#endif
		973
		974	for (i = NUMPRI; i--; )
		975	array_free (pending, [i]);
		976
		977	/* have to use the microsoft-never-gets-it-right macro */
		978	array_free (fdchange, EMPTY0);
		979	array_free (timer, EMPTY0);
		980	#if EV_PERIODIC_ENABLE
		981	array_free (periodic, EMPTY0);
		982	#endif
		983	array_free (idle, EMPTY0);
		984	array_free (prepare, EMPTY0);
		985	array_free (check, EMPTY0);
		986
		987	backend = 0;
		988	}
		989
		990	void inline_size infy_fork (EV_P);
		991
		992	void inline_size
		993	loop_fork (EV_P)
		994	{
		995	#if EV_USE_PORT
		996	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		997	#endif
		998	#if EV_USE_KQUEUE
		999	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1000	#endif
		1001	#if EV_USE_EPOLL
		1002	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1003	#endif
		1004	#if EV_USE_INOTIFY
		1005	infy_fork (EV_A);
		1006	#endif
		1007
		1008	if (ev_is_active (&sigev))
		1009	{
		1010	/* default loop */
		1011
		1012	ev_ref (EV_A);
		1013	ev_io_stop (EV_A_ &sigev);
		1014	close (sigpipe [0]);
		1015	close (sigpipe [1]);
		1016
		1017	while (pipe (sigpipe))
		1018	syserr ("(libev) error creating pipe");
		1019
		1020	siginit (EV_A);
		1021	}
		1022
		1023	postfork = 0;
		1024	}
		1025
		1026	#if EV_MULTIPLICITY
		1027	struct ev_loop *
		1028	ev_loop_new (unsigned int flags)
		1029	{
		1030	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1031
		1032	memset (loop, 0, sizeof (struct ev_loop));
		1033
		1034	loop_init (EV_A_ flags);
		1035
		1036	if (ev_backend (EV_A))
		1037	return loop;
		1038
		1039	return 0;
		1040	}
		1041
		1042	void
		1043	ev_loop_destroy (EV_P)
		1044	{
		1045	loop_destroy (EV_A);
		1046	ev_free (loop);
		1047	}
		1048
		1049	void
		1050	ev_loop_fork (EV_P)
		1051	{
		1052	postfork = 1;
		1053	}
		1054
		1055	#endif
		1056
		1057	#if EV_MULTIPLICITY
		1058	struct ev_loop *
		1059	ev_default_loop_init (unsigned int flags)
		1060	#else
		1061	int
		1062	ev_default_loop (unsigned int flags)
		1063	#endif
		1064	{
		1065	if (sigpipe [0] == sigpipe [1])
393	if (pipe (sigpipe))	1066	if (pipe (sigpipe))
394	return 0;	1067	return 0;
395		1068
396	ev_method = EVMETHOD_NONE;	1069	if (!ev_default_loop_ptr)
397	#if HAVE_EPOLL	1070	{
398	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	1071	#if EV_MULTIPLICITY
		1072	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1073	#else
		1074	ev_default_loop_ptr = 1;
399	#endif	1075	#endif
400	#if HAVE_SELECT
401	if (ev_method == EVMETHOD_NONE) select_init (flags);
402	#endif
403		1076
404	if (ev_method)	1077	loop_init (EV_A_ flags);
		1078
		1079	if (ev_backend (EV_A))
405	{	1080	{
406	evw_init (&sigev, sigcb);
407	siginit ();	1081	siginit (EV_A);
408		1082
		1083	#ifndef _WIN32
409	evsignal_init (&childev, childcb, SIGCHLD);	1084	ev_signal_init (&childev, childcb, SIGCHLD);
		1085	ev_set_priority (&childev, EV_MAXPRI);
410	evsignal_start (&childev);	1086	ev_signal_start (EV_A_ &childev);
		1087	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1088	#endif
411	}	1089	}
		1090	else
		1091	ev_default_loop_ptr = 0;
412	}	1092	}
413		1093
414	return ev_method;	1094	return ev_default_loop_ptr;
		1095	}
		1096
		1097	void
		1098	ev_default_destroy (void)
		1099	{
		1100	#if EV_MULTIPLICITY
		1101	struct ev_loop *loop = ev_default_loop_ptr;
		1102	#endif
		1103
		1104	#ifndef _WIN32
		1105	ev_ref (EV_A); /* child watcher */
		1106	ev_signal_stop (EV_A_ &childev);
		1107	#endif
		1108
		1109	ev_ref (EV_A); /* signal watcher */
		1110	ev_io_stop (EV_A_ &sigev);
		1111
		1112	close (sigpipe [0]); sigpipe [0] = 0;
		1113	close (sigpipe [1]); sigpipe [1] = 0;
		1114
		1115	loop_destroy (EV_A);
		1116	}
		1117
		1118	void
		1119	ev_default_fork (void)
		1120	{
		1121	#if EV_MULTIPLICITY
		1122	struct ev_loop *loop = ev_default_loop_ptr;
		1123	#endif
		1124
		1125	if (backend)
		1126	postfork = 1;
415	}	1127	}
416		1128
417	/*****************************************************************************/	1129	/*****************************************************************************/
418		1130
419	void ev_prefork (void)	1131	int inline_size
		1132	any_pending (EV_P)
420	{	1133	{
421	/* nop */
422	}
423
424	void ev_postfork_parent (void)
425	{
426	/* nop */
427	}
428
429	void ev_postfork_child (void)
430	{
431	#if HAVE_EPOLL
432	if (ev_method == EVMETHOD_EPOLL)
433	epoll_postfork_child ();
434	#endif
435
436	evio_stop (&sigev);
437	close (sigpipe [0]);
438	close (sigpipe [1]);
439	pipe (sigpipe);
440	siginit ();
441	}
442
443	/*****************************************************************************/
444
445	static void
446	fd_reify (void)
447	{
448	int i;	1134	int pri;
449		1135
450	for (i = 0; i < fdchangecnt; ++i)	1136	for (pri = NUMPRI; pri--; )
		1137	if (pendingcnt [pri])
		1138	return 1;
		1139
		1140	return 0;
		1141	}
		1142
		1143	void inline_speed
		1144	call_pending (EV_P)
		1145	{
		1146	int pri;
		1147
		1148	for (pri = NUMPRI; pri--; )
		1149	while (pendingcnt [pri])
451	{	1150	{
452	int fd = fdchanges [i];	1151	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
453	ANFD *anfd = anfds + fd;
454	struct ev_io *w;
455		1152
456	int wev = 0;	1153	if (expect_true (p->w))
457
458	for (w = anfd->head; w; w = w->next)
459	wev |= w->events;
460
461	if (anfd->wev != wev)
462	{	1154	{
463	method_modify (fd, anfd->wev, wev);	1155	/*assert (("non-pending watcher on pending list", p->w->pending));*/
464	anfd->wev = wev;
465	}
466	}
467		1156
468	fdchangecnt = 0;
469	}
470
471	static void
472	call_pending ()
473	{
474	while (pendingcnt)
475	{
476	ANPENDING *p = pendings + --pendingcnt;
477
478	if (p->w)
479	{
480	p->w->pending = 0;	1157	p->w->pending = 0;
481	p->w->cb (p->w, p->events);	1158	EV_CB_INVOKE (p->w, p->events);
482	}	1159	}
483	}	1160	}
484	}	1161	}
485		1162
486	static void	1163	void inline_size
487	timers_reify ()	1164	timers_reify (EV_P)
488	{	1165	{
489	while (timercnt && timers [0]->at <= now)	1166	while (timercnt && ((WT)timers [0])->at <= mn_now)
490	{	1167	{
491	struct ev_timer *w = timers [0];	1168	ev_timer *w = timers [0];
492		1169
493	event ((W)w, EV_TIMEOUT);	1170	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
494		1171
495	/* first reschedule or stop timer */	1172	/* first reschedule or stop timer */
496	if (w->repeat)	1173	if (w->repeat)
497	{	1174	{
		1175	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1176
498	w->at = now + w->repeat;	1177	((WT)w)->at += w->repeat;
499	assert (("timer timeout in the past, negative repeat?", w->at > now));	1178	if (((WT)w)->at < mn_now)
		1179	((WT)w)->at = mn_now;
		1180
500	downheap ((WT *)timers, timercnt, 0);	1181	downheap ((WT *)timers, timercnt, 0);
501	}	1182	}
502	else	1183	else
503	evtimer_stop (w); /* nonrepeating: stop timer */	1184	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
504	}
505	}
506		1185
507	static void	1186	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1187	}
		1188	}
		1189
		1190	#if EV_PERIODIC_ENABLE
		1191	void inline_size
508	periodics_reify ()	1192	periodics_reify (EV_P)
509	{	1193	{
510	while (periodiccnt && periodics [0]->at <= ev_now)	1194	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
511	{	1195	{
512	struct ev_periodic *w = periodics [0];	1196	ev_periodic *w = periodics [0];
		1197
		1198	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
513		1199
514	/* first reschedule or stop timer */	1200	/* first reschedule or stop timer */
515	if (w->interval)	1201	if (w->reschedule_cb)
516	{	1202	{
		1203	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1204	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1205	downheap ((WT *)periodics, periodiccnt, 0);
		1206	}
		1207	else if (w->interval)
		1208	{
517	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1209	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
518	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1210	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
519	downheap ((WT *)periodics, periodiccnt, 0);	1211	downheap ((WT *)periodics, periodiccnt, 0);
520	}	1212	}
521	else	1213	else
522	evperiodic_stop (w); /* nonrepeating: stop timer */	1214	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
523		1215
524	event ((W)w, EV_TIMEOUT);	1216	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
525	}	1217	}
526	}	1218	}
527		1219
528	static void	1220	static void noinline
529	periodics_reschedule (ev_tstamp diff)	1221	periodics_reschedule (EV_P)
530	{	1222	{
531	int i;	1223	int i;
532		1224
533	/* adjust periodics after time jump */	1225	/* adjust periodics after time jump */
534	for (i = 0; i < periodiccnt; ++i)	1226	for (i = 0; i < periodiccnt; ++i)
535	{	1227	{
536	struct ev_periodic *w = periodics [i];	1228	ev_periodic *w = periodics [i];
537		1229
		1230	if (w->reschedule_cb)
		1231	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
538	if (w->interval)	1232	else if (w->interval)
		1233	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1234	}
		1235
		1236	/* now rebuild the heap */
		1237	for (i = periodiccnt >> 1; i--; )
		1238	downheap ((WT *)periodics, periodiccnt, i);
		1239	}
		1240	#endif
		1241
		1242	int inline_size
		1243	time_update_monotonic (EV_P)
		1244	{
		1245	mn_now = get_clock ();
		1246
		1247	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1248	{
		1249	ev_rt_now = rtmn_diff + mn_now;
		1250	return 0;
		1251	}
		1252	else
		1253	{
		1254	now_floor = mn_now;
		1255	ev_rt_now = ev_time ();
		1256	return 1;
		1257	}
		1258	}
		1259
		1260	void inline_size
		1261	time_update (EV_P)
		1262	{
		1263	int i;
		1264
		1265	#if EV_USE_MONOTONIC
		1266	if (expect_true (have_monotonic))
		1267	{
		1268	if (time_update_monotonic (EV_A))
539	{	1269	{
540	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1270	ev_tstamp odiff = rtmn_diff;
541		1271
542	if (fabs (diff) >= 1e-4)	1272	/* loop a few times, before making important decisions.
		1273	* on the choice of "4": one iteration isn't enough,
		1274	* in case we get preempted during the calls to
		1275	* ev_time and get_clock. a second call is almost guarenteed
		1276	* to succeed in that case, though. and looping a few more times
		1277	* doesn't hurt either as we only do this on time-jumps or
		1278	* in the unlikely event of getting preempted here.
		1279	*/
		1280	for (i = 4; --i; )
543	{	1281	{
544	evperiodic_stop (w);	1282	rtmn_diff = ev_rt_now - mn_now;
545	evperiodic_start (w);
546		1283
547	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1284	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1285	return; /* all is well */
		1286
		1287	ev_rt_now = ev_time ();
		1288	mn_now = get_clock ();
		1289	now_floor = mn_now;
548	}	1290	}
		1291
		1292	# if EV_PERIODIC_ENABLE
		1293	periodics_reschedule (EV_A);
		1294	# endif
		1295	/* no timer adjustment, as the monotonic clock doesn't jump */
		1296	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
549	}	1297	}
550	}	1298	}
551	}	1299	else
552		1300	#endif
553	static void	1301	{
554	time_update ()
555	{
556	int i;
557
558	ev_now = ev_time ();	1302	ev_rt_now = ev_time ();
559		1303
560	if (have_monotonic)	1304	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
561	{
562	ev_tstamp odiff = diff;
563
564	for (i = 4; --i; ) /* loop a few times, before making important decisions */
565	{	1305	{
566	now = get_clock ();	1306	#if EV_PERIODIC_ENABLE
567	diff = ev_now - now;
568
569	if (fabs (odiff - diff) < MIN_TIMEJUMP)
570	return; /* all is well */
571
572	ev_now = ev_time ();
573	}
574
575	periodics_reschedule (diff - odiff);
576	/* no timer adjustment, as the monotonic clock doesn't jump */
577	}
578	else
579	{
580	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
581	{
582	periodics_reschedule (ev_now - now);	1307	periodics_reschedule (EV_A);
		1308	#endif
583		1309
584	/* adjust timers. this is easy, as the offset is the same for all */	1310	/* adjust timers. this is easy, as the offset is the same for all */
585	for (i = 0; i < timercnt; ++i)	1311	for (i = 0; i < timercnt; ++i)
586	timers [i]->at += diff;	1312	((WT)timers [i])->at += ev_rt_now - mn_now;
587	}	1313	}
588		1314
589	now = ev_now;	1315	mn_now = ev_rt_now;
590	}
591	}
592
593	int ev_loop_done;
594
595	void ev_loop (int flags)
596	{
597	double block;
598	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;
599
600	do
601	{	1316	}
		1317	}
		1318
		1319	void
		1320	ev_ref (EV_P)
		1321	{
		1322	++activecnt;
		1323	}
		1324
		1325	void
		1326	ev_unref (EV_P)
		1327	{
		1328	--activecnt;
		1329	}
		1330
		1331	static int loop_done;
		1332
		1333	void
		1334	ev_loop (EV_P_ int flags)
		1335	{
		1336	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1337	? EVUNLOOP_ONE
		1338	: EVUNLOOP_CANCEL;
		1339
		1340	while (activecnt)
		1341	{
		1342	/* we might have forked, so reify kernel state if necessary */
		1343	#if EV_FORK_ENABLE
		1344	if (expect_false (postfork))
		1345	if (forkcnt)
		1346	{
		1347	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1348	call_pending (EV_A);
		1349	}
		1350	#endif
		1351
602	/* queue check watchers (and execute them) */	1352	/* queue check watchers (and execute them) */
603	if (preparecnt)	1353	if (expect_false (preparecnt))
604	{	1354	{
605	queue_events ((W *)prepares, preparecnt, EV_PREPARE);	1355	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
606	call_pending ();	1356	call_pending (EV_A);
607	}	1357	}
608		1358
		1359	/* we might have forked, so reify kernel state if necessary */
		1360	if (expect_false (postfork))
		1361	loop_fork (EV_A);
		1362
609	/* update fd-related kernel structures */	1363	/* update fd-related kernel structures */
610	fd_reify ();	1364	fd_reify (EV_A);
611		1365
612	/* calculate blocking time */	1366	/* calculate blocking time */
		1367	{
		1368	double block;
613		1369
614	/* we only need this for !monotonic clockor timers, but as we basically
615	always have timers, we just calculate it always */
616	ev_now = ev_time ();
617
618	if (flags & EVLOOP_NONBLOCK || idlecnt)	1370	if (flags & EVLOOP_NONBLOCK || idlecnt)
619	block = 0.;	1371	block = 0.; /* do not block at all */
620	else	1372	else
621	{	1373	{
		1374	/* update time to cancel out callback processing overhead */
		1375	#if EV_USE_MONOTONIC
		1376	if (expect_true (have_monotonic))
		1377	time_update_monotonic (EV_A);
		1378	else
		1379	#endif
		1380	{
		1381	ev_rt_now = ev_time ();
		1382	mn_now = ev_rt_now;
		1383	}
		1384
622	block = MAX_BLOCKTIME;	1385	block = MAX_BLOCKTIME;
623		1386
624	if (timercnt)	1387	if (timercnt)
625	{	1388	{
626	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1389	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
627	if (block > to) block = to;	1390	if (block > to) block = to;
628	}	1391	}
629		1392
		1393	#if EV_PERIODIC_ENABLE
630	if (periodiccnt)	1394	if (periodiccnt)
631	{	1395	{
632	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1396	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
633	if (block > to) block = to;	1397	if (block > to) block = to;
634	}	1398	}
		1399	#endif
635		1400
636	if (block < 0.) block = 0.;	1401	if (expect_false (block < 0.)) block = 0.;
637	}	1402	}
638		1403
639	method_poll (block);	1404	backend_poll (EV_A_ block);
		1405	}
640		1406
641	/* update ev_now, do magic */	1407	/* update ev_rt_now, do magic */
642	time_update ();	1408	time_update (EV_A);
643		1409
644	/* queue pending timers and reschedule them */	1410	/* queue pending timers and reschedule them */
645	timers_reify (); /* relative timers called last */	1411	timers_reify (EV_A); /* relative timers called last */
		1412	#if EV_PERIODIC_ENABLE
646	periodics_reify (); /* absolute timers called first */	1413	periodics_reify (EV_A); /* absolute timers called first */
		1414	#endif
647		1415
648	/* queue idle watchers unless io or timers are pending */	1416	/* queue idle watchers unless other events are pending */
649	if (!pendingcnt)	1417	if (idlecnt && !any_pending (EV_A))
650	queue_events ((W *)idles, idlecnt, EV_IDLE);	1418	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
651		1419
652	/* queue check watchers, to be executed first */	1420	/* queue check watchers, to be executed first */
653	if (checkcnt)	1421	if (expect_false (checkcnt))
654	queue_events ((W *)checks, checkcnt, EV_CHECK);	1422	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
655		1423
656	call_pending ();	1424	call_pending (EV_A);
657	}
658	while (!ev_loop_done);
659		1425
660	if (ev_loop_done != 2)	1426	if (expect_false (loop_done))
		1427	break;
		1428	}
		1429
		1430	if (loop_done == EVUNLOOP_ONE)
		1431	loop_done = EVUNLOOP_CANCEL;
		1432	}
		1433
		1434	void
		1435	ev_unloop (EV_P_ int how)
		1436	{
661	ev_loop_done = 0;	1437	loop_done = how;
662	}	1438	}
663		1439
664	/*****************************************************************************/	1440	/*****************************************************************************/
665		1441
666	static void	1442	void inline_size
667	wlist_add (WL *head, WL elem)	1443	wlist_add (WL *head, WL elem)
668	{	1444	{
669	elem->next = *head;	1445	elem->next = *head;
670	*head = elem;	1446	*head = elem;
671	}	1447	}
672		1448
673	static void	1449	void inline_size
674	wlist_del (WL *head, WL elem)	1450	wlist_del (WL *head, WL elem)
675	{	1451	{
676	while (*head)	1452	while (*head)
677	{	1453	{
678	if (*head == elem)	1454	if (*head == elem)
…		…
683		1459
684	head = &(*head)->next;	1460	head = &(*head)->next;
685	}	1461	}
686	}	1462	}
687		1463
688	static void	1464	void inline_speed
689	ev_clear (W w)	1465	ev_clear_pending (EV_P_ W w)
690	{	1466	{
691	if (w->pending)	1467	if (w->pending)
692	{	1468	{
693	pendings [w->pending - 1].w = 0;	1469	pendings [ABSPRI (w)][w->pending - 1].w = 0;
694	w->pending = 0;	1470	w->pending = 0;
695	}	1471	}
696	}	1472	}
697		1473
698	static void	1474	void inline_speed
699	ev_start (W w, int active)	1475	ev_start (EV_P_ W w, int active)
700	{	1476	{
		1477	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1478	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1479
701	w->active = active;	1480	w->active = active;
		1481	ev_ref (EV_A);
702	}	1482	}
703		1483
704	static void	1484	void inline_size
705	ev_stop (W w)	1485	ev_stop (EV_P_ W w)
706	{	1486	{
		1487	ev_unref (EV_A);
707	w->active = 0;	1488	w->active = 0;
708	}	1489	}
709		1490
710	/*****************************************************************************/	1491	/*****************************************************************************/
711		1492
712	void	1493	void
713	evio_start (struct ev_io *w)	1494	ev_io_start (EV_P_ ev_io *w)
714	{	1495	{
715	if (ev_is_active (w))
716	return;
717
718	int fd = w->fd;	1496	int fd = w->fd;
719		1497
		1498	if (expect_false (ev_is_active (w)))
		1499	return;
		1500
		1501	assert (("ev_io_start called with negative fd", fd >= 0));
		1502
720	ev_start ((W)w, 1);	1503	ev_start (EV_A_ (W)w, 1);
721	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1504	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
722	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1505	wlist_add ((WL *)&anfds[fd].head, (WL)w);
723		1506
724	++fdchangecnt;	1507	fd_change (EV_A_ fd);
725	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
726	fdchanges [fdchangecnt - 1] = fd;
727	}	1508	}
728		1509
729	void	1510	void
730	evio_stop (struct ev_io *w)	1511	ev_io_stop (EV_P_ ev_io *w)
731	{	1512	{
732	ev_clear ((W)w);	1513	ev_clear_pending (EV_A_ (W)w);
733	if (!ev_is_active (w))	1514	if (expect_false (!ev_is_active (w)))
734	return;	1515	return;
		1516
		1517	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
735		1518
736	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1519	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
737	ev_stop ((W)w);	1520	ev_stop (EV_A_ (W)w);
738		1521
739	++fdchangecnt;	1522	fd_change (EV_A_ w->fd);
740	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
741	fdchanges [fdchangecnt - 1] = w->fd;
742	}	1523	}
743		1524
744	void	1525	void
745	evtimer_start (struct ev_timer *w)	1526	ev_timer_start (EV_P_ ev_timer *w)
746	{	1527	{
747	if (ev_is_active (w))	1528	if (expect_false (ev_is_active (w)))
748	return;	1529	return;
749		1530
750	w->at += now;	1531	((WT)w)->at += mn_now;
751		1532
752	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1533	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
753		1534
754	ev_start ((W)w, ++timercnt);	1535	ev_start (EV_A_ (W)w, ++timercnt);
755	array_needsize (timers, timermax, timercnt, );	1536	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
756	timers [timercnt - 1] = w;	1537	timers [timercnt - 1] = w;
757	upheap ((WT *)timers, timercnt - 1);	1538	upheap ((WT *)timers, timercnt - 1);
758	}
759		1539
		1540	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1541	}
		1542
760	void	1543	void
761	evtimer_stop (struct ev_timer *w)	1544	ev_timer_stop (EV_P_ ev_timer *w)
762	{	1545	{
763	ev_clear ((W)w);	1546	ev_clear_pending (EV_A_ (W)w);
764	if (!ev_is_active (w))	1547	if (expect_false (!ev_is_active (w)))
765	return;	1548	return;
766		1549
767	if (w->active < timercnt--)	1550	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1551
		1552	{
		1553	int active = ((W)w)->active;
		1554
		1555	if (expect_true (--active < --timercnt))
768	{	1556	{
769	timers [w->active - 1] = timers [timercnt];	1557	timers [active] = timers [timercnt];
770	downheap ((WT *)timers, timercnt, w->active - 1);	1558	adjustheap ((WT *)timers, timercnt, active);
771	}	1559	}
		1560	}
772		1561
773	w->at = w->repeat;	1562	((WT)w)->at -= mn_now;
774		1563
775	ev_stop ((W)w);	1564	ev_stop (EV_A_ (W)w);
776	}	1565	}
777		1566
778	void	1567	void
779	evtimer_again (struct ev_timer *w)	1568	ev_timer_again (EV_P_ ev_timer *w)
780	{	1569	{
781	if (ev_is_active (w))	1570	if (ev_is_active (w))
782	{	1571	{
783	if (w->repeat)	1572	if (w->repeat)
784	{	1573	{
785	w->at = now + w->repeat;	1574	((WT)w)->at = mn_now + w->repeat;
786	downheap ((WT *)timers, timercnt, w->active - 1);	1575	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
787	}	1576	}
788	else	1577	else
789	evtimer_stop (w);	1578	ev_timer_stop (EV_A_ w);
790	}	1579	}
791	else if (w->repeat)	1580	else if (w->repeat)
		1581	{
		1582	w->at = w->repeat;
792	evtimer_start (w);	1583	ev_timer_start (EV_A_ w);
		1584	}
793	}	1585	}
794		1586
		1587	#if EV_PERIODIC_ENABLE
795	void	1588	void
796	evperiodic_start (struct ev_periodic *w)	1589	ev_periodic_start (EV_P_ ev_periodic *w)
797	{	1590	{
798	if (ev_is_active (w))	1591	if (expect_false (ev_is_active (w)))
799	return;	1592	return;
800		1593
801	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1594	if (w->reschedule_cb)
802		1595	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1596	else if (w->interval)
		1597	{
		1598	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
803	/* this formula differs from the one in periodic_reify because we do not always round up */	1599	/* this formula differs from the one in periodic_reify because we do not always round up */
804	if (w->interval)
805	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1600	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1601	}
806		1602
807	ev_start ((W)w, ++periodiccnt);	1603	ev_start (EV_A_ (W)w, ++periodiccnt);
808	array_needsize (periodics, periodicmax, periodiccnt, );	1604	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
809	periodics [periodiccnt - 1] = w;	1605	periodics [periodiccnt - 1] = w;
810	upheap ((WT *)periodics, periodiccnt - 1);	1606	upheap ((WT *)periodics, periodiccnt - 1);
811	}
812		1607
		1608	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
		1609	}
		1610
813	void	1611	void
814	evperiodic_stop (struct ev_periodic *w)	1612	ev_periodic_stop (EV_P_ ev_periodic *w)
815	{	1613	{
816	ev_clear ((W)w);	1614	ev_clear_pending (EV_A_ (W)w);
817	if (!ev_is_active (w))	1615	if (expect_false (!ev_is_active (w)))
818	return;	1616	return;
819		1617
820	if (w->active < periodiccnt--)	1618	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1619
		1620	{
		1621	int active = ((W)w)->active;
		1622
		1623	if (expect_true (--active < --periodiccnt))
821	{	1624	{
822	periodics [w->active - 1] = periodics [periodiccnt];	1625	periodics [active] = periodics [periodiccnt];
823	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1626	adjustheap ((WT *)periodics, periodiccnt, active);
824	}	1627	}
		1628	}
825		1629
826	ev_stop ((W)w);	1630	ev_stop (EV_A_ (W)w);
827	}	1631	}
828		1632
829	void	1633	void
		1634	ev_periodic_again (EV_P_ ev_periodic *w)
		1635	{
		1636	/* TODO: use adjustheap and recalculation */
		1637	ev_periodic_stop (EV_A_ w);
		1638	ev_periodic_start (EV_A_ w);
		1639	}
		1640	#endif
		1641
		1642	#ifndef SA_RESTART
		1643	# define SA_RESTART 0
		1644	#endif
		1645
		1646	void
830	evsignal_start (struct ev_signal *w)	1647	ev_signal_start (EV_P_ ev_signal *w)
831	{	1648	{
		1649	#if EV_MULTIPLICITY
		1650	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1651	#endif
832	if (ev_is_active (w))	1652	if (expect_false (ev_is_active (w)))
833	return;	1653	return;
834		1654
		1655	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1656
835	ev_start ((W)w, 1);	1657	ev_start (EV_A_ (W)w, 1);
836	array_needsize (signals, signalmax, w->signum, signals_init);	1658	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
837	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1659	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
838		1660
839	if (!w->next)	1661	if (!((WL)w)->next)
840	{	1662	{
		1663	#if _WIN32
		1664	signal (w->signum, sighandler);
		1665	#else
841	struct sigaction sa;	1666	struct sigaction sa;
842	sa.sa_handler = sighandler;	1667	sa.sa_handler = sighandler;
843	sigfillset (&sa.sa_mask);	1668	sigfillset (&sa.sa_mask);
844	sa.sa_flags = 0;	1669	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
845	sigaction (w->signum, &sa, 0);	1670	sigaction (w->signum, &sa, 0);
		1671	#endif
846	}	1672	}
847	}	1673	}
848		1674
849	void	1675	void
850	evsignal_stop (struct ev_signal *w)	1676	ev_signal_stop (EV_P_ ev_signal *w)
851	{	1677	{
852	ev_clear ((W)w);	1678	ev_clear_pending (EV_A_ (W)w);
853	if (!ev_is_active (w))	1679	if (expect_false (!ev_is_active (w)))
854	return;	1680	return;
855		1681
856	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1682	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
857	ev_stop ((W)w);	1683	ev_stop (EV_A_ (W)w);
858		1684
859	if (!signals [w->signum - 1].head)	1685	if (!signals [w->signum - 1].head)
860	signal (w->signum, SIG_DFL);	1686	signal (w->signum, SIG_DFL);
861	}	1687	}
862		1688
863	void evidle_start (struct ev_idle *w)	1689	void
		1690	ev_child_start (EV_P_ ev_child *w)
864	{	1691	{
		1692	#if EV_MULTIPLICITY
		1693	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1694	#endif
865	if (ev_is_active (w))	1695	if (expect_false (ev_is_active (w)))
866	return;	1696	return;
867		1697
		1698	ev_start (EV_A_ (W)w, 1);
		1699	wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1700	}
		1701
		1702	void
		1703	ev_child_stop (EV_P_ ev_child *w)
		1704	{
		1705	ev_clear_pending (EV_A_ (W)w);
		1706	if (expect_false (!ev_is_active (w)))
		1707	return;
		1708
		1709	wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1710	ev_stop (EV_A_ (W)w);
		1711	}
		1712
		1713	#if EV_STAT_ENABLE
		1714
		1715	# ifdef _WIN32
		1716	# undef lstat
		1717	# define lstat(a,b) _stati64 (a,b)
		1718	# endif
		1719
		1720	#define DEF_STAT_INTERVAL 5.0074891
		1721	#define MIN_STAT_INTERVAL 0.1074891
		1722
		1723	void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1724
		1725	#if EV_USE_INOTIFY
		1726	# define EV_INOTIFY_BUFSIZE 8192
		1727
		1728	static void noinline
		1729	infy_add (EV_P_ ev_stat *w)
		1730	{
		1731	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);
		1732
		1733	if (w->wd < 0)
		1734	{
		1735	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1736
		1737	/* monitor some parent directory for speedup hints */
		1738	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1739	{
		1740	char path [4096];
		1741	strcpy (path, w->path);
		1742
		1743	do
		1744	{
		1745	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1746	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1747
		1748	char *pend = strrchr (path, '/');
		1749
		1750	if (!pend)
		1751	break; /* whoops, no '/', complain to your admin */
		1752
		1753	*pend = 0;
		1754	w->wd = inotify_add_watch (fs_fd, path, mask);
		1755	}
		1756	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1757	}
		1758	}
		1759	else
		1760	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1761
		1762	if (w->wd >= 0)
		1763	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1764	}
		1765
		1766	static void noinline
		1767	infy_del (EV_P_ ev_stat *w)
		1768	{
		1769	int slot;
		1770	int wd = w->wd;
		1771
		1772	if (wd < 0)
		1773	return;
		1774
		1775	w->wd = -2;
		1776	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1777	wlist_del (&fs_hash [slot].head, (WL)w);
		1778
		1779	/* remove this watcher, if others are watching it, they will rearm */
		1780	inotify_rm_watch (fs_fd, wd);
		1781	}
		1782
		1783	static void noinline
		1784	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1785	{
		1786	if (slot < 0)
		1787	/* overflow, need to check for all hahs slots */
		1788	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1789	infy_wd (EV_A_ slot, wd, ev);
		1790	else
		1791	{
		1792	WL w_;
		1793
		1794	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1795	{
		1796	ev_stat *w = (ev_stat *)w_;
		1797	w_ = w_->next; /* lets us remove this watcher and all before it */
		1798
		1799	if (w->wd == wd || wd == -1)
		1800	{
		1801	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1802	{
		1803	w->wd = -1;
		1804	infy_add (EV_A_ w); /* re-add, no matter what */
		1805	}
		1806
		1807	stat_timer_cb (EV_A_ &w->timer, 0);
		1808	}
		1809	}
		1810	}
		1811	}
		1812
		1813	static void
		1814	infy_cb (EV_P_ ev_io *w, int revents)
		1815	{
		1816	char buf [EV_INOTIFY_BUFSIZE];
		1817	struct inotify_event *ev = (struct inotify_event *)buf;
		1818	int ofs;
		1819	int len = read (fs_fd, buf, sizeof (buf));
		1820
		1821	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1822	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1823	}
		1824
		1825	void inline_size
		1826	infy_init (EV_P)
		1827	{
		1828	if (fs_fd != -2)
		1829	return;
		1830
		1831	fs_fd = inotify_init ();
		1832
		1833	if (fs_fd >= 0)
		1834	{
		1835	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1836	ev_set_priority (&fs_w, EV_MAXPRI);
		1837	ev_io_start (EV_A_ &fs_w);
		1838	}
		1839	}
		1840
		1841	void inline_size
		1842	infy_fork (EV_P)
		1843	{
		1844	int slot;
		1845
		1846	if (fs_fd < 0)
		1847	return;
		1848
		1849	close (fs_fd);
		1850	fs_fd = inotify_init ();
		1851
		1852	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1853	{
		1854	WL w_ = fs_hash [slot].head;
		1855	fs_hash [slot].head = 0;
		1856
		1857	while (w_)
		1858	{
		1859	ev_stat *w = (ev_stat *)w_;
		1860	w_ = w_->next; /* lets us add this watcher */
		1861
		1862	w->wd = -1;
		1863
		1864	if (fs_fd >= 0)
		1865	infy_add (EV_A_ w); /* re-add, no matter what */
		1866	else
		1867	ev_timer_start (EV_A_ &w->timer);
		1868	}
		1869
		1870	}
		1871	}
		1872
		1873	#endif
		1874
		1875	void
		1876	ev_stat_stat (EV_P_ ev_stat *w)
		1877	{
		1878	if (lstat (w->path, &w->attr) < 0)
		1879	w->attr.st_nlink = 0;
		1880	else if (!w->attr.st_nlink)
		1881	w->attr.st_nlink = 1;
		1882	}
		1883
		1884	void noinline
		1885	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		1886	{
		1887	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		1888
		1889	/* we copy this here each the time so that */
		1890	/* prev has the old value when the callback gets invoked */
		1891	w->prev = w->attr;
		1892	ev_stat_stat (EV_A_ w);
		1893
		1894	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		1895	if (
		1896	w->prev.st_dev != w->attr.st_dev
		1897	|| w->prev.st_ino != w->attr.st_ino
		1898	|| w->prev.st_mode != w->attr.st_mode
		1899	|| w->prev.st_nlink != w->attr.st_nlink
		1900	|| w->prev.st_uid != w->attr.st_uid
		1901	|| w->prev.st_gid != w->attr.st_gid
		1902	|| w->prev.st_rdev != w->attr.st_rdev
		1903	|| w->prev.st_size != w->attr.st_size
		1904	|| w->prev.st_atime != w->attr.st_atime
		1905	|| w->prev.st_mtime != w->attr.st_mtime
		1906	|| w->prev.st_ctime != w->attr.st_ctime
		1907	) {
		1908	#if EV_USE_INOTIFY
		1909	infy_del (EV_A_ w);
		1910	infy_add (EV_A_ w);
		1911	ev_stat_stat (EV_A_ w); /* avoid race... */
		1912	#endif
		1913
		1914	ev_feed_event (EV_A_ w, EV_STAT);
		1915	}
		1916	}
		1917
		1918	void
		1919	ev_stat_start (EV_P_ ev_stat *w)
		1920	{
		1921	if (expect_false (ev_is_active (w)))
		1922	return;
		1923
		1924	/* since we use memcmp, we need to clear any padding data etc. */
		1925	memset (&w->prev, 0, sizeof (ev_statdata));
		1926	memset (&w->attr, 0, sizeof (ev_statdata));
		1927
		1928	ev_stat_stat (EV_A_ w);
		1929
		1930	if (w->interval < MIN_STAT_INTERVAL)
		1931	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		1932
		1933	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		1934	ev_set_priority (&w->timer, ev_priority (w));
		1935
		1936	#if EV_USE_INOTIFY
		1937	infy_init (EV_A);
		1938
		1939	if (fs_fd >= 0)
		1940	infy_add (EV_A_ w);
		1941	else
		1942	#endif
		1943	ev_timer_start (EV_A_ &w->timer);
		1944
		1945	ev_start (EV_A_ (W)w, 1);
		1946	}
		1947
		1948	void
		1949	ev_stat_stop (EV_P_ ev_stat *w)
		1950	{
		1951	ev_clear_pending (EV_A_ (W)w);
		1952	if (expect_false (!ev_is_active (w)))
		1953	return;
		1954
		1955	#if EV_USE_INOTIFY
		1956	infy_del (EV_A_ w);
		1957	#endif
		1958	ev_timer_stop (EV_A_ &w->timer);
		1959
		1960	ev_stop (EV_A_ (W)w);
		1961	}
		1962	#endif
		1963
		1964	void
		1965	ev_idle_start (EV_P_ ev_idle *w)
		1966	{
		1967	if (expect_false (ev_is_active (w)))
		1968	return;
		1969
868	ev_start ((W)w, ++idlecnt);	1970	ev_start (EV_A_ (W)w, ++idlecnt);
869	array_needsize (idles, idlemax, idlecnt, );	1971	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
870	idles [idlecnt - 1] = w;	1972	idles [idlecnt - 1] = w;
871	}	1973	}
872		1974
873	void evidle_stop (struct ev_idle *w)	1975	void
		1976	ev_idle_stop (EV_P_ ev_idle *w)
874	{	1977	{
875	ev_clear ((W)w);	1978	ev_clear_pending (EV_A_ (W)w);
876	if (ev_is_active (w))	1979	if (expect_false (!ev_is_active (w)))
877	return;	1980	return;
878		1981
		1982	{
		1983	int active = ((W)w)->active;
879	idles [w->active - 1] = idles [--idlecnt];	1984	idles [active - 1] = idles [--idlecnt];
		1985	((W)idles [active - 1])->active = active;
		1986	}
		1987
880	ev_stop ((W)w);	1988	ev_stop (EV_A_ (W)w);
881	}	1989	}
882		1990
		1991	void
883	void evprepare_start (struct ev_prepare *w)	1992	ev_prepare_start (EV_P_ ev_prepare *w)
884	{	1993	{
885	if (ev_is_active (w))	1994	if (expect_false (ev_is_active (w)))
886	return;	1995	return;
887		1996
888	ev_start ((W)w, ++preparecnt);	1997	ev_start (EV_A_ (W)w, ++preparecnt);
889	array_needsize (prepares, preparemax, preparecnt, );	1998	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
890	prepares [preparecnt - 1] = w;	1999	prepares [preparecnt - 1] = w;
891	}	2000	}
892		2001
		2002	void
893	void evprepare_stop (struct ev_prepare *w)	2003	ev_prepare_stop (EV_P_ ev_prepare *w)
894	{	2004	{
895	ev_clear ((W)w);	2005	ev_clear_pending (EV_A_ (W)w);
896	if (ev_is_active (w))	2006	if (expect_false (!ev_is_active (w)))
897	return;	2007	return;
898		2008
		2009	{
		2010	int active = ((W)w)->active;
899	prepares [w->active - 1] = prepares [--preparecnt];	2011	prepares [active - 1] = prepares [--preparecnt];
		2012	((W)prepares [active - 1])->active = active;
		2013	}
		2014
900	ev_stop ((W)w);	2015	ev_stop (EV_A_ (W)w);
901	}	2016	}
902		2017
		2018	void
903	void evcheck_start (struct ev_check *w)	2019	ev_check_start (EV_P_ ev_check *w)
904	{	2020	{
905	if (ev_is_active (w))	2021	if (expect_false (ev_is_active (w)))
906	return;	2022	return;
907		2023
908	ev_start ((W)w, ++checkcnt);	2024	ev_start (EV_A_ (W)w, ++checkcnt);
909	array_needsize (checks, checkmax, checkcnt, );	2025	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
910	checks [checkcnt - 1] = w;	2026	checks [checkcnt - 1] = w;
911	}	2027	}
912		2028
		2029	void
913	void evcheck_stop (struct ev_check *w)	2030	ev_check_stop (EV_P_ ev_check *w)
914	{	2031	{
915	ev_clear ((W)w);	2032	ev_clear_pending (EV_A_ (W)w);
916	if (ev_is_active (w))	2033	if (expect_false (!ev_is_active (w)))
917	return;	2034	return;
918		2035
		2036	{
		2037	int active = ((W)w)->active;
919	checks [w->active - 1] = checks [--checkcnt];	2038	checks [active - 1] = checks [--checkcnt];
		2039	((W)checks [active - 1])->active = active;
		2040	}
		2041
920	ev_stop ((W)w);	2042	ev_stop (EV_A_ (W)w);
921	}	2043	}
922		2044
923	void evchild_start (struct ev_child *w)	2045	#if EV_EMBED_ENABLE
		2046	void noinline
		2047	ev_embed_sweep (EV_P_ ev_embed *w)
924	{	2048	{
		2049	ev_loop (w->loop, EVLOOP_NONBLOCK);
		2050	}
		2051
		2052	static void
		2053	embed_cb (EV_P_ ev_io *io, int revents)
		2054	{
		2055	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		2056
925	if (ev_is_active (w))	2057	if (ev_cb (w))
926	return;	2058	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		2059	else
		2060	ev_embed_sweep (loop, w);
		2061	}
927		2062
		2063	void
		2064	ev_embed_start (EV_P_ ev_embed *w)
		2065	{
		2066	if (expect_false (ev_is_active (w)))
		2067	return;
		2068
		2069	{
		2070	struct ev_loop *loop = w->loop;
		2071	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		2072	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		2073	}
		2074
		2075	ev_set_priority (&w->io, ev_priority (w));
		2076	ev_io_start (EV_A_ &w->io);
		2077
928	ev_start ((W)w, 1);	2078	ev_start (EV_A_ (W)w, 1);
929	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
930	}	2079	}
931		2080
932	void evchild_stop (struct ev_child *w)	2081	void
		2082	ev_embed_stop (EV_P_ ev_embed *w)
933	{	2083	{
934	ev_clear ((W)w);	2084	ev_clear_pending (EV_A_ (W)w);
935	if (ev_is_active (w))	2085	if (expect_false (!ev_is_active (w)))
936	return;	2086	return;
937		2087
938	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);	2088	ev_io_stop (EV_A_ &w->io);
		2089
939	ev_stop ((W)w);	2090	ev_stop (EV_A_ (W)w);
940	}	2091	}
		2092	#endif
		2093
		2094	#if EV_FORK_ENABLE
		2095	void
		2096	ev_fork_start (EV_P_ ev_fork *w)
		2097	{
		2098	if (expect_false (ev_is_active (w)))
		2099	return;
		2100
		2101	ev_start (EV_A_ (W)w, ++forkcnt);
		2102	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2103	forks [forkcnt - 1] = w;
		2104	}
		2105
		2106	void
		2107	ev_fork_stop (EV_P_ ev_fork *w)
		2108	{
		2109	ev_clear_pending (EV_A_ (W)w);
		2110	if (expect_false (!ev_is_active (w)))
		2111	return;
		2112
		2113	{
		2114	int active = ((W)w)->active;
		2115	forks [active - 1] = forks [--forkcnt];
		2116	((W)forks [active - 1])->active = active;
		2117	}
		2118
		2119	ev_stop (EV_A_ (W)w);
		2120	}
		2121	#endif
941		2122
942	/*****************************************************************************/	2123	/*****************************************************************************/
943		2124
944	struct ev_once	2125	struct ev_once
945	{	2126	{
946	struct ev_io io;	2127	ev_io io;
947	struct ev_timer to;	2128	ev_timer to;
948	void (*cb)(int revents, void *arg);	2129	void (*cb)(int revents, void *arg);
949	void *arg;	2130	void *arg;
950	};	2131	};
951		2132
952	static void	2133	static void
953	once_cb (struct ev_once *once, int revents)	2134	once_cb (EV_P_ struct ev_once *once, int revents)
954	{	2135	{
955	void (*cb)(int revents, void *arg) = once->cb;	2136	void (*cb)(int revents, void *arg) = once->cb;
956	void *arg = once->arg;	2137	void *arg = once->arg;
957		2138
958	evio_stop (&once->io);	2139	ev_io_stop (EV_A_ &once->io);
959	evtimer_stop (&once->to);	2140	ev_timer_stop (EV_A_ &once->to);
960	free (once);	2141	ev_free (once);
961		2142
962	cb (revents, arg);	2143	cb (revents, arg);
963	}	2144	}
964		2145
965	static void	2146	static void
966	once_cb_io (struct ev_io *w, int revents)	2147	once_cb_io (EV_P_ ev_io *w, int revents)
967	{	2148	{
968	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);	2149	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
969	}	2150	}
970		2151
971	static void	2152	static void
972	once_cb_to (struct ev_timer *w, int revents)	2153	once_cb_to (EV_P_ ev_timer *w, int revents)
973	{	2154	{
974	once_cb ((struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);	2155	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
975	}	2156	}
976		2157
977	void	2158	void
978	ev_once (int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)	2159	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
979	{	2160	{
980	struct ev_once *once = malloc (sizeof (struct ev_once));	2161	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
981		2162
982	if (!once)	2163	if (expect_false (!once))
983	cb (EV_ERROR, arg);	2164	{
984	else	2165	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		2166	return;
985	{	2167	}
		2168
986	once->cb = cb;	2169	once->cb = cb;
987	once->arg = arg;	2170	once->arg = arg;
988		2171
989	evw_init (&once->io, once_cb_io);	2172	ev_init (&once->io, once_cb_io);
990
991	if (fd >= 0)	2173	if (fd >= 0)
992	{	2174	{
993	evio_set (&once->io, fd, events);	2175	ev_io_set (&once->io, fd, events);
994	evio_start (&once->io);	2176	ev_io_start (EV_A_ &once->io);
995	}	2177	}
996		2178
997	evw_init (&once->to, once_cb_to);	2179	ev_init (&once->to, once_cb_to);
998
999	if (timeout >= 0.)	2180	if (timeout >= 0.)
1000	{	2181	{
1001	evtimer_set (&once->to, timeout, 0.);	2182	ev_timer_set (&once->to, timeout, 0.);
1002	evtimer_start (&once->to);	2183	ev_timer_start (EV_A_ &once->to);
1003	}
1004	}
1005	}
1006
1007	/*****************************************************************************/
1008
1009	#if 0
1010
1011	struct ev_io wio;
1012
1013	static void
1014	sin_cb (struct ev_io *w, int revents)
1015	{
1016	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
1017	}
1018
1019	static void
1020	ocb (struct ev_timer *w, int revents)
1021	{
1022	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
1023	evtimer_stop (w);
1024	evtimer_start (w);
1025	}
1026
1027	static void
1028	scb (struct ev_signal *w, int revents)
1029	{
1030	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
1031	evio_stop (&wio);
1032	evio_start (&wio);
1033	}
1034
1035	static void
1036	gcb (struct ev_signal *w, int revents)
1037	{
1038	fprintf (stderr, "generic %x\n", revents);
1039
1040	}
1041
1042	int main (void)
1043	{
1044	ev_init (0);
1045
1046	evio_init (&wio, sin_cb, 0, EV_READ);
1047	evio_start (&wio);
1048
1049	struct ev_timer t[10000];
1050
1051	#if 0
1052	int i;
1053	for (i = 0; i < 10000; ++i)
1054	{	2184	}
1055	struct ev_timer *w = t + i;
1056	evw_init (w, ocb, i);
1057	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
1058	evtimer_start (w);
1059	if (drand48 () < 0.5)
1060	evtimer_stop (w);
1061	}
1062	#endif
1063
1064	struct ev_timer t1;
1065	evtimer_init (&t1, ocb, 5, 10);
1066	evtimer_start (&t1);
1067
1068	struct ev_signal sig;
1069	evsignal_init (&sig, scb, SIGQUIT);
1070	evsignal_start (&sig);
1071
1072	struct ev_check cw;
1073	evcheck_init (&cw, gcb);
1074	evcheck_start (&cw);
1075
1076	struct ev_idle iw;
1077	evidle_init (&iw, gcb);
1078	evidle_start (&iw);
1079
1080	ev_loop (0);
1081
1082	return 0;
1083	}	2185	}
1084		2186
		2187	#ifdef __cplusplus
		2188	}
1085	#endif	2189	#endif
1086		2190
1087
1088
1089

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