libev/ev.c

#include <math.h>
#include <stdlib.h>

#include <stdio.h>

#include <assert.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>

#ifdef CLOCK_MONOTONIC
# define HAVE_MONOTONIC 1
#endif

#define HAVE_EPOLL 1
#define HAVE_REALTIME 1
#define HAVE_SELECT 1

#define MIN_TIMEJUMP  1. /* minimum timejump that gets detected (if monotonic clock available) */
#define MAX_BLOCKTIME 60.

#include "ev.h"

struct ev_watcher {
  EV_WATCHER (ev_watcher);
};

struct ev_watcher_list {
  EV_WATCHER_LIST (ev_watcher_list);
};

static ev_tstamp now, diff; /* monotonic clock */
ev_tstamp ev_now;
int ev_method;

static int have_monotonic; /* runtime */

static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
static void (*method_modify)(int fd, int oev, int nev);
static void (*method_poll)(ev_tstamp timeout);

ev_tstamp
ev_time (void)
{
#if HAVE_REALTIME
  struct timespec ts;
  clock_gettime (CLOCK_REALTIME, &ts);
  return ts.tv_sec + ts.tv_nsec * 1e-9;
#else
  struct timeval tv;
  gettimeofday (&tv, 0);
  return tv.tv_sec + tv.tv_usec * 1e-6;
#endif
}

static ev_tstamp
get_clock (void)
{
#if HAVE_MONOTONIC
  if (have_monotonic)
    {
      struct timespec ts;
      clock_gettime (CLOCK_MONOTONIC, &ts);
      return ts.tv_sec + ts.tv_nsec * 1e-9;
    }
#endif

  return ev_time ();
}

#define array_needsize(base,cur,cnt,init)               \
  if ((cnt) > cur)                                      \
    {                                                   \
      int newcnt = cur ? cur << 1 : 16;                 \
      fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
      base = realloc (base, sizeof (*base) * (newcnt)); \
      init (base + cur, newcnt - cur);                  \
      cur = newcnt;                                     \
    }

typedef struct
{
  struct ev_io *head;
  unsigned char wev, rev; /* want, received event set */
} ANFD;

static ANFD *anfds;
static int anfdmax;

static int *fdchanges;
static int fdchangemax, fdchangecnt;

static void
anfds_init (ANFD *base, int count)
{
  while (count--)
    {
      base->head = 0;
      base->wev = base->rev = EV_NONE;
      ++base;
    }
}

typedef struct
{
  struct ev_watcher *w;
  int events;
} ANPENDING;

static ANPENDING *pendings;
static int pendingmax, pendingcnt;

static void
event (struct ev_watcher *w, int events)
{
  w->pending = ++pendingcnt;
  array_needsize (pendings, pendingmax, pendingcnt, );
  pendings [pendingcnt - 1].w      = w;
  pendings [pendingcnt - 1].events = events;
}

static void
fd_event (int fd, int events)
{
  ANFD *anfd = anfds + fd;
  struct ev_io *w;

  for (w = anfd->head; w; w = w->next)
    {
      int ev = w->events & events;

      if (ev)
        event ((struct ev_watcher *)w, ev);
    }
}

static struct ev_timer **atimers;
static int atimermax, atimercnt;

static struct ev_timer **rtimers;
static int rtimermax, rtimercnt;

static void
upheap (struct ev_timer **timers, int k)
{
  struct ev_timer *w = timers [k];

  while (k && timers [k >> 1]->at > w->at)
    {
      timers [k] = timers [k >> 1];
      timers [k]->active = k + 1;
      k >>= 1;
    }

  timers [k] = w;
  timers [k]->active = k + 1;

}

static void
downheap (struct ev_timer **timers, int N, int k)
{
  struct ev_timer *w = timers [k];

  while (k < (N >> 1))
    {
      int j = k << 1;

      if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
        ++j;

      if (w->at <= timers [j]->at)
        break;

      timers [k] = timers [j];
      timers [k]->active = k + 1;
      k = j;
    }

  timers [k] = w;
  timers [k]->active = k + 1;
}

static struct ev_signal **signals;
static int signalmax;

static void
signals_init (struct ev_signal **base, int count)
{
  while (count--)
    *base++ = 0;
}

#if HAVE_EPOLL
# include "ev_epoll.c"
#endif
#if HAVE_SELECT
# include "ev_select.c"
#endif

int ev_init (int flags)
{
#if HAVE_MONOTONIC
  {
    struct timespec ts;
    if (!clock_gettime (CLOCK_MONOTONIC, &ts))
      have_monotonic = 1;
  }
#endif

  ev_now = ev_time ();
  now    = get_clock ();
  diff   = ev_now - now;

#if HAVE_EPOLL
  if (epoll_init (flags))
    return ev_method;
#endif
#if HAVE_SELECT
  if (select_init (flags))
    return ev_method;
#endif

  ev_method = EVMETHOD_NONE;
  return ev_method;
}

void ev_prefork (void)
{
}

void ev_postfork_parent (void)
{
}

void ev_postfork_child (void)
{
#if HAVE_EPOLL
  if (ev_method == EVMETHOD_EPOLL)
    epoll_postfork_child ();
#endif
}

static void
fd_reify (void)
{
  int i;

  for (i = 0; i < fdchangecnt; ++i)
    {
      int fd = fdchanges [i];
      ANFD *anfd = anfds + fd;
      struct ev_io *w;

      int wev = 0;

      for (w = anfd->head; w; w = w->next)
        wev |= w->events;

      if (anfd->wev != wev)
        {
          method_modify (fd, anfd->wev, wev);
          anfd->wev = wev;
        }
    }

  fdchangecnt = 0;
}

static void
call_pending ()
{
  int i;

  for (i = 0; i < pendingcnt; ++i)
    {
      ANPENDING *p = pendings + i;

      if (p->w)
        {
          p->w->pending = 0;
          p->w->cb (p->w, p->events);
        }
    }

  pendingcnt = 0;
}

static void
timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
{
  while (timercnt && timers [0]->at <= now)
    {
      struct ev_timer *w = timers [0];

      /* first reschedule or stop timer */
      if (w->repeat)
        {
          if (w->is_abs)
            w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
          else
            w->at = now + w->repeat;

          assert (w->at > now);

          downheap (timers, timercnt, 0);
        }
      else
        {
          evtimer_stop (w); /* nonrepeating: stop timer */
          --timercnt; /* maybe pass by reference instead? */
        }

      event ((struct ev_watcher *)w, EV_TIMEOUT);
    }
}

static void
time_update ()
{
  int i;
  ev_now = ev_time ();

  if (have_monotonic)
    {
      ev_tstamp odiff = diff;

      /* detecting time jumps is much more difficult */
      for (i = 2; --i; ) /* loop a few times, before making important decisions */
        {
          now = get_clock ();
          diff = ev_now - now;

          if (fabs (odiff - diff) < MIN_TIMEJUMP)
            return; /* all is well */

          ev_now = ev_time ();
        }

      /* time jump detected, reschedule atimers */
      for (i = 0; i < atimercnt; ++i)
        {
          struct ev_timer *w = atimers [i];
          w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
        }
    }
  else
    {
      if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
        /* time jump detected, adjust rtimers */
        for (i = 0; i < rtimercnt; ++i)
          rtimers [i]->at += ev_now - now;

      now = ev_now;
    }
}

int ev_loop_done;

void ev_loop (int flags)
{
  double block;
  ev_loop_done = flags & EVLOOP_ONESHOT;

  do
    {
      /* update fd-related kernel structures */
      fd_reify ();

      /* calculate blocking time */
      if (flags & EVLOOP_NONBLOCK)
        block = 0.;
      else
        {
          block = MAX_BLOCKTIME;

          if (rtimercnt)
            {
              ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
              if (block > to) block = to;
            }

          if (atimercnt)
            {
              ev_tstamp to = atimers [0]->at - ev_time   () + method_fudge;
              if (block > to) block = to;
            }

          if (block < 0.) block = 0.;
        }

      method_poll (block);

      /* update ev_now, do magic */
      time_update ();

      /* put pending timers into pendign queue and reschedule them */
      /* absolute timers first */
      timers_reify (atimers, atimercnt, ev_now);
      /* relative timers second */
      timers_reify (rtimers, rtimercnt, now);

      call_pending ();
    }
  while (!ev_loop_done);
}

static void
wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)
{
  elem->next = *head;
  *head = elem;
}

static void
wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)
{
  while (*head)
    {
      if (*head == elem)
        {
          *head = elem->next;
          return;
        }

      head = &(*head)->next;
    }
}

static void
ev_start (struct ev_watcher *w, int active)
{
  w->pending = 0;
  w->active = active;
}

static void
ev_stop (struct ev_watcher *w)
{
  if (w->pending)
    pendings [w->pending - 1].w = 0;

  w->active = 0;
  /* nop */
}

void
evio_start (struct ev_io *w)
{
  if (ev_is_active (w))
    return;

  int fd = w->fd;

  ev_start ((struct ev_watcher *)w, 1);
  array_needsize (anfds, anfdmax, fd + 1, anfds_init);
  wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);

  ++fdchangecnt;
  array_needsize (fdchanges, fdchangemax, fdchangecnt, );
  fdchanges [fdchangecnt - 1] = fd;
}

void
evio_stop (struct ev_io *w)
{
  if (!ev_is_active (w))
    return;

  wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
  ev_stop ((struct ev_watcher *)w);

  ++fdchangecnt;
  array_needsize (fdchanges, fdchangemax, fdchangecnt, );
  fdchanges [fdchangecnt - 1] = w->fd;
}

void
evtimer_start (struct ev_timer *w)
{
  if (ev_is_active (w))
    return;

  if (w->is_abs)
    {
      /* this formula differs from the one in timer_reify becuse we do not round up */
      if (w->repeat)
        w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;

      ev_start ((struct ev_watcher *)w, ++atimercnt);
      array_needsize (atimers, atimermax, atimercnt, );
      atimers [atimercnt - 1] = w;
      upheap (atimers, atimercnt - 1);
    }
  else
    {
      w->at += now;

      ev_start ((struct ev_watcher *)w, ++rtimercnt);
      array_needsize (rtimers, rtimermax, rtimercnt, );
      rtimers [rtimercnt - 1] = w;
      upheap (rtimers, rtimercnt - 1);
    }

}

void
evtimer_stop (struct ev_timer *w)
{
  if (!ev_is_active (w))
    return;

  if (w->is_abs)
    {
      if (w->active < atimercnt--)
        {
          atimers [w->active - 1] = atimers [atimercnt];
          downheap (atimers, atimercnt, w->active - 1);
        }
    }
  else
    {
      if (w->active < rtimercnt--)
        {
          rtimers [w->active - 1] = rtimers [rtimercnt];
          downheap (rtimers, rtimercnt, w->active - 1);
        }
    }

  ev_stop ((struct ev_watcher *)w);
}

void
evsignal_start (struct ev_signal *w)
{
  if (ev_is_active (w))
    return;

  ev_start ((struct ev_watcher *)w, 1);
  array_needsize (signals, signalmax, w->signum, signals_init);
  wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
}

void
evsignal_stop (struct ev_signal *w)
{
  if (!ev_is_active (w))
    return;

  wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
  ev_stop ((struct ev_watcher *)w);
}

/*****************************************************************************/
#if 1

static void
sin_cb (struct ev_io *w, int revents)
{
  fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
}

static void
ocb (struct ev_timer *w, int revents)
{
  //fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
  evtimer_stop (w);
  evtimer_start (w);
}

int main (void)
{
  struct ev_io sin;

  ev_init (0);

  evw_init (&sin, sin_cb, 55);
  evio_set (&sin, 0, EV_READ);
  evio_start (&sin);

  struct ev_timer t[10000];

#if 1
  int i;
  for (i = 0; i < 10000; ++i)
    {
      struct ev_timer *w = t + i;
      evw_init (w, ocb, i);
      evtimer_set_abs (w, drand48 (), 0.99775533);
      evtimer_start (w);
      if (drand48 () < 0.5)
        evtimer_stop (w);
    }
#endif

  struct ev_timer t1;
  evw_init (&t1, ocb, 0);
  evtimer_set_abs (&t1, 5, 10);
  evtimer_start (&t1);

  ev_loop (0);

  return 0;
}

#endif


Revision:	1.5
Committed:	Tue Oct 30 23:54:38 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+31 -4 lines
Log Message:	implement select method
#	User	Rev	Content
1	root	1.1	#include <math.h>
2			#include <stdlib.h>
3
4			#include <stdio.h>
5
6	root	1.4	#include <assert.h>
7	root	1.1	#include <errno.h>
8			#include <sys/time.h>
9			#include <time.h>
10
11			#ifdef CLOCK_MONOTONIC
12			# define HAVE_MONOTONIC 1
13			#endif
14
15			#define HAVE_EPOLL 1
16			#define HAVE_REALTIME 1
17	root	1.5	#define HAVE_SELECT 1
18	root	1.1
19	root	1.4	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	root	1.1	#define MAX_BLOCKTIME 60.
21
22			#include "ev.h"
23
24			struct ev_watcher {
25			EV_WATCHER (ev_watcher);
26			};
27
28			struct ev_watcher_list {
29			EV_WATCHER_LIST (ev_watcher_list);
30			};
31
32	root	1.4	static ev_tstamp now, diff; /* monotonic clock */
33	root	1.1	ev_tstamp ev_now;
34			int ev_method;
35
36			static int have_monotonic; /* runtime */
37
38			static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
39	root	1.5	static void (*method_modify)(int fd, int oev, int nev);
40	root	1.1	static void (*method_poll)(ev_tstamp timeout);
41
42			ev_tstamp
43			ev_time (void)
44			{
45			#if HAVE_REALTIME
46			struct timespec ts;
47			clock_gettime (CLOCK_REALTIME, &ts);
48			return ts.tv_sec + ts.tv_nsec * 1e-9;
49			#else
50			struct timeval tv;
51			gettimeofday (&tv, 0);
52			return tv.tv_sec + tv.tv_usec * 1e-6;
53			#endif
54			}
55
56			static ev_tstamp
57			get_clock (void)
58			{
59			#if HAVE_MONOTONIC
60			if (have_monotonic)
61			{
62			struct timespec ts;
63			clock_gettime (CLOCK_MONOTONIC, &ts);
64			return ts.tv_sec + ts.tv_nsec * 1e-9;
65			}
66			#endif
67
68			return ev_time ();
69			}
70
71			#define array_needsize(base,cur,cnt,init) \
72			if ((cnt) > cur) \
73			{ \
74	root	1.2	int newcnt = cur ? cur << 1 : 16; \
75	root	1.1	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
76			base = realloc (base, sizeof (base) (newcnt)); \
77			init (base + cur, newcnt - cur); \
78			cur = newcnt; \
79			}
80
81			typedef struct
82			{
83			struct ev_io *head;
84			unsigned char wev, rev; /* want, received event set */
85			} ANFD;
86
87			static ANFD *anfds;
88			static int anfdmax;
89
90			static int *fdchanges;
91			static int fdchangemax, fdchangecnt;
92
93			static void
94			anfds_init (ANFD *base, int count)
95			{
96			while (count--)
97			{
98			base->head = 0;
99			base->wev = base->rev = EV_NONE;
100			++base;
101			}
102			}
103
104			typedef struct
105			{
106			struct ev_watcher *w;
107			int events;
108			} ANPENDING;
109
110			static ANPENDING *pendings;
111			static int pendingmax, pendingcnt;
112
113			static void
114			event (struct ev_watcher *w, int events)
115			{
116			w->pending = ++pendingcnt;
117			array_needsize (pendings, pendingmax, pendingcnt, );
118			pendings [pendingcnt - 1].w = w;
119			pendings [pendingcnt - 1].events = events;
120			}
121
122			static void
123			fd_event (int fd, int events)
124			{
125			ANFD *anfd = anfds + fd;
126			struct ev_io *w;
127
128			for (w = anfd->head; w; w = w->next)
129			{
130			int ev = w->events & events;
131
132			if (ev)
133			event ((struct ev_watcher *)w, ev);
134			}
135			}
136
137	root	1.4	static struct ev_timer **atimers;
138			static int atimermax, atimercnt;
139
140			static struct ev_timer **rtimers;
141			static int rtimermax, rtimercnt;
142	root	1.1
143			static void
144	root	1.4	upheap (struct ev_timer **timers, int k)
145	root	1.1	{
146			struct ev_timer *w = timers [k];
147
148			while (k && timers [k >> 1]->at > w->at)
149			{
150			timers [k] = timers [k >> 1];
151			timers [k]->active = k + 1;
152			k >>= 1;
153			}
154
155			timers [k] = w;
156			timers [k]->active = k + 1;
157
158			}
159
160			static void
161	root	1.4	downheap (struct ev_timer **timers, int N, int k)
162	root	1.1	{
163			struct ev_timer *w = timers [k];
164
165	root	1.4	while (k < (N >> 1))
166	root	1.1	{
167			int j = k << 1;
168
169	root	1.4	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	root	1.1	++j;
171
172			if (w->at <= timers [j]->at)
173			break;
174
175			timers [k] = timers [j];
176	root	1.2	timers [k]->active = k + 1;
177	root	1.1	k = j;
178			}
179
180			timers [k] = w;
181			timers [k]->active = k + 1;
182			}
183
184			static struct ev_signal **signals;
185	root	1.4	static int signalmax;
186	root	1.1
187			static void
188			signals_init (struct ev_signal **base, int count)
189			{
190			while (count--)
191			*base++ = 0;
192			}
193
194			#if HAVE_EPOLL
195			# include "ev_epoll.c"
196			#endif
197			#if HAVE_SELECT
198			# include "ev_select.c"
199			#endif
200
201			int ev_init (int flags)
202			{
203			#if HAVE_MONOTONIC
204			{
205			struct timespec ts;
206			if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207			have_monotonic = 1;
208			}
209			#endif
210
211			ev_now = ev_time ();
212	root	1.4	now = get_clock ();
213			diff = ev_now - now;
214	root	1.1
215			#if HAVE_EPOLL
216			if (epoll_init (flags))
217			return ev_method;
218			#endif
219			#if HAVE_SELECT
220			if (select_init (flags))
221			return ev_method;
222			#endif
223
224			ev_method = EVMETHOD_NONE;
225			return ev_method;
226			}
227
228			void ev_prefork (void)
229			{
230			}
231
232			void ev_postfork_parent (void)
233			{
234			}
235
236			void ev_postfork_child (void)
237			{
238			#if HAVE_EPOLL
239	root	1.5	if (ev_method == EVMETHOD_EPOLL)
240			epoll_postfork_child ();
241	root	1.1	#endif
242			}
243
244			static void
245	root	1.5	fd_reify (void)
246			{
247			int i;
248
249			for (i = 0; i < fdchangecnt; ++i)
250			{
251			int fd = fdchanges [i];
252			ANFD *anfd = anfds + fd;
253			struct ev_io *w;
254
255			int wev = 0;
256
257			for (w = anfd->head; w; w = w->next)
258			wev \|= w->events;
259
260			if (anfd->wev != wev)
261			{
262			method_modify (fd, anfd->wev, wev);
263			anfd->wev = wev;
264			}
265			}
266
267			fdchangecnt = 0;
268			}
269
270			static void
271	root	1.1	call_pending ()
272			{
273			int i;
274
275			for (i = 0; i < pendingcnt; ++i)
276			{
277			ANPENDING *p = pendings + i;
278
279			if (p->w)
280			{
281			p->w->pending = 0;
282			p->w->cb (p->w, p->events);
283			}
284			}
285
286			pendingcnt = 0;
287			}
288
289			static void
290	root	1.4	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
291	root	1.1	{
292	root	1.4	while (timercnt && timers [0]->at <= now)
293	root	1.1	{
294			struct ev_timer *w = timers [0];
295
296	root	1.4	/* first reschedule or stop timer */
297	root	1.1	if (w->repeat)
298			{
299			if (w->is_abs)
300	root	1.4	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	root	1.1	else
302	root	1.4	w->at = now + w->repeat;
303
304			assert (w->at > now);
305	root	1.1
306	root	1.4	downheap (timers, timercnt, 0);
307	root	1.1	}
308			else
309	root	1.4	{
310			evtimer_stop (w); /* nonrepeating: stop timer */
311			--timercnt; /* maybe pass by reference instead? */
312			}
313	root	1.1
314			event ((struct ev_watcher *)w, EV_TIMEOUT);
315			}
316			}
317
318	root	1.4	static void
319			time_update ()
320			{
321			int i;
322			ev_now = ev_time ();
323
324			if (have_monotonic)
325			{
326			ev_tstamp odiff = diff;
327
328			/* detecting time jumps is much more difficult */
329			for (i = 2; --i; ) /* loop a few times, before making important decisions */
330			{
331			now = get_clock ();
332			diff = ev_now - now;
333
334			if (fabs (odiff - diff) < MIN_TIMEJUMP)
335			return; /* all is well */
336
337			ev_now = ev_time ();
338			}
339
340			/* time jump detected, reschedule atimers */
341			for (i = 0; i < atimercnt; ++i)
342			{
343			struct ev_timer *w = atimers [i];
344			w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
345			}
346			}
347			else
348			{
349			if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350			/* time jump detected, adjust rtimers */
351			for (i = 0; i < rtimercnt; ++i)
352			rtimers [i]->at += ev_now - now;
353
354			now = ev_now;
355			}
356			}
357
358	root	1.1	int ev_loop_done;
359
360	root	1.4	void ev_loop (int flags)
361	root	1.1	{
362			double block;
363			ev_loop_done = flags & EVLOOP_ONESHOT;
364
365			do
366			{
367			/* update fd-related kernel structures */
368	root	1.5	fd_reify ();
369	root	1.1
370			/* calculate blocking time */
371			if (flags & EVLOOP_NONBLOCK)
372			block = 0.;
373			else
374			{
375	root	1.4	block = MAX_BLOCKTIME;
376
377			if (rtimercnt)
378			{
379			ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
380			if (block > to) block = to;
381			}
382
383			if (atimercnt)
384			{
385			ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
386			if (block > to) block = to;
387			}
388
389	root	1.1	if (block < 0.) block = 0.;
390			}
391
392			method_poll (block);
393
394	root	1.4	/* update ev_now, do magic */
395			time_update ();
396
397	root	1.1	/* put pending timers into pendign queue and reschedule them */
398	root	1.4	/* absolute timers first */
399			timers_reify (atimers, atimercnt, ev_now);
400			/* relative timers second */
401			timers_reify (rtimers, rtimercnt, now);
402	root	1.1
403			call_pending ();
404			}
405			while (!ev_loop_done);
406			}
407
408			static void
409			wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)
410			{
411			elem->next = *head;
412			*head = elem;
413			}
414
415			static void
416			wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)
417			{
418			while (*head)
419			{
420			if (*head == elem)
421			{
422			*head = elem->next;
423			return;
424			}
425
426			head = &(*head)->next;
427			}
428			}
429
430			static void
431			ev_start (struct ev_watcher *w, int active)
432			{
433			w->pending = 0;
434			w->active = active;
435			}
436
437			static void
438			ev_stop (struct ev_watcher *w)
439			{
440			if (w->pending)
441			pendings [w->pending - 1].w = 0;
442
443			w->active = 0;
444			/* nop */
445			}
446
447			void
448			evio_start (struct ev_io *w)
449			{
450			if (ev_is_active (w))
451			return;
452
453			int fd = w->fd;
454
455			ev_start ((struct ev_watcher *)w, 1);
456			array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457			wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);
458
459			++fdchangecnt;
460			array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461			fdchanges [fdchangecnt - 1] = fd;
462			}
463
464			void
465			evio_stop (struct ev_io *w)
466			{
467			if (!ev_is_active (w))
468			return;
469
470			wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);
471			ev_stop ((struct ev_watcher *)w);
472
473			++fdchangecnt;
474			array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475			fdchanges [fdchangecnt - 1] = w->fd;
476			}
477
478			void
479			evtimer_start (struct ev_timer *w)
480			{
481			if (ev_is_active (w))
482			return;
483
484			if (w->is_abs)
485			{
486	root	1.2	/* this formula differs from the one in timer_reify becuse we do not round up */
487	root	1.1	if (w->repeat)
488			w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
489	root	1.4
490			ev_start ((struct ev_watcher *)w, ++atimercnt);
491			array_needsize (atimers, atimermax, atimercnt, );
492			atimers [atimercnt - 1] = w;
493			upheap (atimers, atimercnt - 1);
494	root	1.1	}
495			else
496	root	1.4	{
497			w->at += now;
498
499			ev_start ((struct ev_watcher *)w, ++rtimercnt);
500			array_needsize (rtimers, rtimermax, rtimercnt, );
501			rtimers [rtimercnt - 1] = w;
502			upheap (rtimers, rtimercnt - 1);
503			}
504	root	1.1
505			}
506
507			void
508			evtimer_stop (struct ev_timer *w)
509			{
510			if (!ev_is_active (w))
511			return;
512
513	root	1.4	if (w->is_abs)
514	root	1.2	{
515	root	1.4	if (w->active < atimercnt--)
516			{
517			atimers [w->active - 1] = atimers [atimercnt];
518			downheap (atimers, atimercnt, w->active - 1);
519			}
520			}
521			else
522			{
523			if (w->active < rtimercnt--)
524			{
525			rtimers [w->active - 1] = rtimers [rtimercnt];
526			downheap (rtimers, rtimercnt, w->active - 1);
527			}
528	root	1.2	}
529
530	root	1.1	ev_stop ((struct ev_watcher *)w);
531			}
532
533			void
534			evsignal_start (struct ev_signal *w)
535			{
536			if (ev_is_active (w))
537			return;
538
539			ev_start ((struct ev_watcher *)w, 1);
540			array_needsize (signals, signalmax, w->signum, signals_init);
541			wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
542			}
543
544			void
545			evsignal_stop (struct ev_signal *w)
546			{
547			if (!ev_is_active (w))
548			return;
549
550			wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1], (struct ev_watcher_list )w);
551			ev_stop ((struct ev_watcher *)w);
552			}
553
554			/*****************************************************************************/
555			#if 1
556
557			static void
558			sin_cb (struct ev_io *w, int revents)
559			{
560			fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561			}
562
563			static void
564			ocb (struct ev_timer *w, int revents)
565			{
566	root	1.4	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567			evtimer_stop (w);
568			evtimer_start (w);
569	root	1.1	}
570
571			int main (void)
572			{
573			struct ev_io sin;
574
575			ev_init (0);
576
577			evw_init (&sin, sin_cb, 55);
578			evio_set (&sin, 0, EV_READ);
579			evio_start (&sin);
580
581	root	1.4	struct ev_timer t[10000];
582	root	1.2
583	root	1.4	#if 1
584	root	1.2	int i;
585	root	1.4	for (i = 0; i < 10000; ++i)
586	root	1.2	{
587			struct ev_timer *w = t + i;
588			evw_init (w, ocb, i);
589	root	1.4	evtimer_set_abs (w, drand48 (), 0.99775533);
590	root	1.2	evtimer_start (w);
591			if (drand48 () < 0.5)
592			evtimer_stop (w);
593			}
594	root	1.4	#endif
595
596			struct ev_timer t1;
597			evw_init (&t1, ocb, 0);
598			evtimer_set_abs (&t1, 5, 10);
599			evtimer_start (&t1);
600	root	1.1
601			ev_loop (0);
602
603			return 0;
604			}
605
606			#endif
607
608
609
610