libev/ev.c

#include <math.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.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_REALTIME 1
#define HAVE_EPOLL 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 void
queue_events (struct ev_watcher **events, int eventcnt, int type)
{
  int i;

  for (i = 0; i < eventcnt; ++i)
    event (events [i], type);
}

/*****************************************************************************/

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;
}

/*****************************************************************************/

typedef struct
{
  struct ev_signal *head;
  sig_atomic_t gotsig;
} ANSIG;

static ANSIG *signals;
static int signalmax;

static int sigpipe [2];
static sig_atomic_t gotsig;
static struct ev_io sigev;

static void
signals_init (ANSIG *base, int count)
{
  while (count--)
    {
      base->head   = 0;
      base->gotsig = 0;
      ++base;
    }
}

static void
sighandler (int signum)
{
  signals [signum - 1].gotsig = 1;

  if (!gotsig)
    {
      gotsig = 1;
      write (sigpipe [1], &gotsig, 1);
    }
}

static void
sigcb (struct ev_io *iow, int revents)
{
  struct ev_signal *w;
  int sig;

  gotsig = 0;
  read (sigpipe [0], &revents, 1);

  for (sig = signalmax; sig--; )
    if (signals [sig].gotsig)
      {
        signals [sig].gotsig = 0;

        for (w = signals [sig].head; w; w = w->next)
          event ((struct ev_watcher *)w, EV_SIGNAL);
      }
}

static void
siginit (void)
{
  fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
  fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);

  /* rather than sort out wether we really need nb, set it */
  fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
  fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);

  evio_set (&sigev, sigpipe [0], EV_READ);
  evio_start (&sigev);
}

/*****************************************************************************/

static struct ev_idle **idles;
static int idlemax, idlecnt;

static struct ev_check **checks;
static int checkmax, checkcnt;

/*****************************************************************************/

#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 (pipe (sigpipe))
    return 0;

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

  if (ev_method)
    {
      evw_init (&sigev, sigcb, 0);
      siginit ();
    }

  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

  evio_stop (&sigev);
  close (sigpipe [0]);
  close (sigpipe [1]);
  pipe (sigpipe);
  siginit ();
}

/*****************************************************************************/

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;

  if (checkcnt)
    {
      queue_events (checks, checkcnt, EV_CHECK);
      call_pending ();
    }

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

      /* calculate blocking time */
      if (flags & EVLOOP_NONBLOCK || idlecnt)
        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 ();

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

      /* queue idle watchers unless io or timers are pending */
      if (!pendingcnt)
        queue_events (idles, idlecnt, EV_IDLE);

      /* queue check and possibly idle watchers */
      queue_events (checks, checkcnt, EV_CHECK);

      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].head, (struct ev_watcher_list *)w);

  if (!w->next)
    {
      struct sigaction sa;
      sa.sa_handler = sighandler;
      sigfillset (&sa.sa_mask);
      sa.sa_flags = 0;
      sigaction (w->signum, &sa, 0);
    }
}

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

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

  if (!signals [w->signum - 1].head)
    signal (w->signum, SIG_DFL);
}

void evidle_start (struct ev_idle *w)
{
  if (ev_is_active (w))
    return;

  ev_start ((struct ev_watcher *)w, ++idlecnt);
  array_needsize (idles, idlemax, idlecnt, );
  idles [idlecnt - 1] = w;
}

void evidle_stop (struct ev_idle *w)
{
  idles [w->active - 1] = idles [--idlecnt];
  ev_stop ((struct ev_watcher *)w);
}

void evcheck_start (struct ev_check *w)
{
  if (ev_is_active (w))
    return;

  ev_start ((struct ev_watcher *)w, ++checkcnt);
  array_needsize (checks, checkmax, checkcnt, );
  checks [checkcnt - 1] = w;
}

void evcheck_stop (struct ev_check *w)
{
  checks [w->active - 1] = checks [--checkcnt];
  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);
}

static void
scb (struct ev_signal *w, int revents)
{
  fprintf (stderr, "signal %x,%d\n", revents, w->signum);
}

static void
gcb (struct ev_signal *w, int revents)
{
  fprintf (stderr, "generic %x\n", revents);
}

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 0
  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);

  struct ev_signal sig;
  evw_init (&sig, scb, 65535);
  evsignal_set (&sig, SIGQUIT);
  evsignal_start (&sig);

  struct ev_check cw;
  evw_init (&cw, gcb, 0);
  evcheck_start (&cw);

  struct ev_idle iw;
  evw_init (&iw, gcb, 0);
  evidle_start (&iw);

  ev_loop (0);

  return 0;
}

#endif


Revision:	1.9
Committed:	Wed Oct 31 07:24:17 2007 UTC (16 years, 6 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.8:	+79 -28 lines
Log Message:	implement idle and check watchers, rmeove flawed hook system
#	User	Rev	Content
1	root	1.1	#include <math.h>
2			#include <stdlib.h>
3	root	1.7	#include <unistd.h>
4			#include <fcntl.h>
5			#include <signal.h>
6	root	1.1
7			#include <stdio.h>
8
9	root	1.4	#include <assert.h>
10	root	1.1	#include <errno.h>
11			#include <sys/time.h>
12			#include <time.h>
13
14			#ifdef CLOCK_MONOTONIC
15			# define HAVE_MONOTONIC 1
16			#endif
17
18	root	1.6	#define HAVE_REALTIME 1
19	root	1.1	#define HAVE_EPOLL 1
20	root	1.5	#define HAVE_SELECT 1
21	root	1.1
22	root	1.4	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	root	1.1	#define MAX_BLOCKTIME 60.
24
25			#include "ev.h"
26
27			struct ev_watcher {
28			EV_WATCHER (ev_watcher);
29			};
30
31			struct ev_watcher_list {
32			EV_WATCHER_LIST (ev_watcher_list);
33			};
34
35	root	1.4	static ev_tstamp now, diff; /* monotonic clock */
36	root	1.1	ev_tstamp ev_now;
37			int ev_method;
38
39			static int have_monotonic; /* runtime */
40
41			static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	root	1.5	static void (*method_modify)(int fd, int oev, int nev);
43	root	1.1	static void (*method_poll)(ev_tstamp timeout);
44
45	root	1.8	/*****************************************************************************/
46
47	root	1.1	ev_tstamp
48			ev_time (void)
49			{
50			#if HAVE_REALTIME
51			struct timespec ts;
52			clock_gettime (CLOCK_REALTIME, &ts);
53			return ts.tv_sec + ts.tv_nsec * 1e-9;
54			#else
55			struct timeval tv;
56			gettimeofday (&tv, 0);
57			return tv.tv_sec + tv.tv_usec * 1e-6;
58			#endif
59			}
60
61			static ev_tstamp
62			get_clock (void)
63			{
64			#if HAVE_MONOTONIC
65			if (have_monotonic)
66			{
67			struct timespec ts;
68			clock_gettime (CLOCK_MONOTONIC, &ts);
69			return ts.tv_sec + ts.tv_nsec * 1e-9;
70			}
71			#endif
72
73			return ev_time ();
74			}
75
76			#define array_needsize(base,cur,cnt,init) \
77			if ((cnt) > cur) \
78			{ \
79	root	1.2	int newcnt = cur ? cur << 1 : 16; \
80	root	1.1	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\
81			base = realloc (base, sizeof (base) (newcnt)); \
82			init (base + cur, newcnt - cur); \
83			cur = newcnt; \
84			}
85
86	root	1.8	/*****************************************************************************/
87
88	root	1.1	typedef struct
89			{
90			struct ev_io *head;
91			unsigned char wev, rev; /* want, received event set */
92			} ANFD;
93
94			static ANFD *anfds;
95			static int anfdmax;
96
97			static int *fdchanges;
98			static int fdchangemax, fdchangecnt;
99
100			static void
101			anfds_init (ANFD *base, int count)
102			{
103			while (count--)
104			{
105			base->head = 0;
106			base->wev = base->rev = EV_NONE;
107			++base;
108			}
109			}
110
111			typedef struct
112			{
113			struct ev_watcher *w;
114			int events;
115			} ANPENDING;
116
117			static ANPENDING *pendings;
118			static int pendingmax, pendingcnt;
119
120			static void
121			event (struct ev_watcher *w, int events)
122			{
123			w->pending = ++pendingcnt;
124			array_needsize (pendings, pendingmax, pendingcnt, );
125			pendings [pendingcnt - 1].w = w;
126			pendings [pendingcnt - 1].events = events;
127			}
128
129			static void
130			fd_event (int fd, int events)
131			{
132			ANFD *anfd = anfds + fd;
133			struct ev_io *w;
134
135			for (w = anfd->head; w; w = w->next)
136			{
137			int ev = w->events & events;
138
139			if (ev)
140			event ((struct ev_watcher *)w, ev);
141			}
142			}
143
144	root	1.9	static void
145			queue_events (struct ev_watcher **events, int eventcnt, int type)
146			{
147			int i;
148
149			for (i = 0; i < eventcnt; ++i)
150			event (events [i], type);
151			}
152
153	root	1.8	/*****************************************************************************/
154
155	root	1.4	static struct ev_timer **atimers;
156			static int atimermax, atimercnt;
157
158			static struct ev_timer **rtimers;
159			static int rtimermax, rtimercnt;
160	root	1.1
161			static void
162	root	1.4	upheap (struct ev_timer **timers, int k)
163	root	1.1	{
164			struct ev_timer *w = timers [k];
165
166			while (k && timers [k >> 1]->at > w->at)
167			{
168			timers [k] = timers [k >> 1];
169			timers [k]->active = k + 1;
170			k >>= 1;
171			}
172
173			timers [k] = w;
174			timers [k]->active = k + 1;
175
176			}
177
178			static void
179	root	1.4	downheap (struct ev_timer **timers, int N, int k)
180	root	1.1	{
181			struct ev_timer *w = timers [k];
182
183	root	1.4	while (k < (N >> 1))
184	root	1.1	{
185			int j = k << 1;
186
187	root	1.4	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
188	root	1.1	++j;
189
190			if (w->at <= timers [j]->at)
191			break;
192
193			timers [k] = timers [j];
194	root	1.2	timers [k]->active = k + 1;
195	root	1.1	k = j;
196			}
197
198			timers [k] = w;
199			timers [k]->active = k + 1;
200			}
201
202	root	1.8	/*****************************************************************************/
203
204	root	1.7	typedef struct
205			{
206			struct ev_signal *head;
207			sig_atomic_t gotsig;
208			} ANSIG;
209
210			static ANSIG *signals;
211	root	1.4	static int signalmax;
212	root	1.1
213	root	1.7	static int sigpipe [2];
214			static sig_atomic_t gotsig;
215			static struct ev_io sigev;
216
217	root	1.1	static void
218	root	1.7	signals_init (ANSIG *base, int count)
219	root	1.1	{
220			while (count--)
221	root	1.7	{
222			base->head = 0;
223			base->gotsig = 0;
224			++base;
225			}
226			}
227
228			static void
229			sighandler (int signum)
230			{
231			signals [signum - 1].gotsig = 1;
232
233			if (!gotsig)
234			{
235			gotsig = 1;
236			write (sigpipe [1], &gotsig, 1);
237			}
238			}
239
240			static void
241			sigcb (struct ev_io *iow, int revents)
242			{
243			struct ev_signal *w;
244			int sig;
245
246			gotsig = 0;
247			read (sigpipe [0], &revents, 1);
248
249			for (sig = signalmax; sig--; )
250			if (signals [sig].gotsig)
251			{
252			signals [sig].gotsig = 0;
253
254			for (w = signals [sig].head; w; w = w->next)
255			event ((struct ev_watcher *)w, EV_SIGNAL);
256			}
257			}
258
259			static void
260			siginit (void)
261			{
262			fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
263			fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264
265			/* rather than sort out wether we really need nb, set it */
266			fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
267			fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
268
269			evio_set (&sigev, sigpipe [0], EV_READ);
270			evio_start (&sigev);
271	root	1.1	}
272
273	root	1.8	/*****************************************************************************/
274
275	root	1.9	static struct ev_idle **idles;
276			static int idlemax, idlecnt;
277
278			static struct ev_check **checks;
279			static int checkmax, checkcnt;
280
281			/*****************************************************************************/
282
283	root	1.1	#if HAVE_EPOLL
284			# include "ev_epoll.c"
285			#endif
286			#if HAVE_SELECT
287			# include "ev_select.c"
288			#endif
289
290			int ev_init (int flags)
291			{
292			#if HAVE_MONOTONIC
293			{
294			struct timespec ts;
295			if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296			have_monotonic = 1;
297			}
298			#endif
299
300			ev_now = ev_time ();
301	root	1.4	now = get_clock ();
302			diff = ev_now - now;
303	root	1.1
304	root	1.7	if (pipe (sigpipe))
305			return 0;
306
307			ev_method = EVMETHOD_NONE;
308	root	1.1	#if HAVE_EPOLL
309	root	1.7	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
310	root	1.1	#endif
311			#if HAVE_SELECT
312	root	1.7	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	root	1.1	#endif
314
315	root	1.7	if (ev_method)
316			{
317			evw_init (&sigev, sigcb, 0);
318			siginit ();
319			}
320
321	root	1.1	return ev_method;
322			}
323
324	root	1.8	/*****************************************************************************/
325
326	root	1.1	void ev_prefork (void)
327			{
328			}
329
330			void ev_postfork_parent (void)
331			{
332			}
333
334			void ev_postfork_child (void)
335			{
336			#if HAVE_EPOLL
337	root	1.5	if (ev_method == EVMETHOD_EPOLL)
338			epoll_postfork_child ();
339	root	1.1	#endif
340	root	1.7
341			evio_stop (&sigev);
342			close (sigpipe [0]);
343			close (sigpipe [1]);
344			pipe (sigpipe);
345			siginit ();
346	root	1.1	}
347
348	root	1.8	/*****************************************************************************/
349
350	root	1.1	static void
351	root	1.5	fd_reify (void)
352			{
353			int i;
354
355			for (i = 0; i < fdchangecnt; ++i)
356			{
357			int fd = fdchanges [i];
358			ANFD *anfd = anfds + fd;
359			struct ev_io *w;
360
361			int wev = 0;
362
363			for (w = anfd->head; w; w = w->next)
364			wev \|= w->events;
365
366			if (anfd->wev != wev)
367			{
368			method_modify (fd, anfd->wev, wev);
369			anfd->wev = wev;
370			}
371			}
372
373			fdchangecnt = 0;
374			}
375
376			static void
377	root	1.1	call_pending ()
378			{
379			int i;
380
381			for (i = 0; i < pendingcnt; ++i)
382			{
383			ANPENDING *p = pendings + i;
384
385			if (p->w)
386			{
387			p->w->pending = 0;
388			p->w->cb (p->w, p->events);
389			}
390			}
391
392			pendingcnt = 0;
393			}
394
395			static void
396	root	1.4	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
397	root	1.1	{
398	root	1.4	while (timercnt && timers [0]->at <= now)
399	root	1.1	{
400			struct ev_timer *w = timers [0];
401
402	root	1.4	/* first reschedule or stop timer */
403	root	1.1	if (w->repeat)
404			{
405			if (w->is_abs)
406	root	1.4	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
407	root	1.1	else
408	root	1.4	w->at = now + w->repeat;
409
410			assert (w->at > now);
411	root	1.1
412	root	1.4	downheap (timers, timercnt, 0);
413	root	1.1	}
414			else
415	root	1.4	{
416			evtimer_stop (w); /* nonrepeating: stop timer */
417			--timercnt; /* maybe pass by reference instead? */
418			}
419	root	1.1
420			event ((struct ev_watcher *)w, EV_TIMEOUT);
421			}
422			}
423
424	root	1.4	static void
425			time_update ()
426			{
427			int i;
428			ev_now = ev_time ();
429
430			if (have_monotonic)
431			{
432			ev_tstamp odiff = diff;
433
434			/* detecting time jumps is much more difficult */
435			for (i = 2; --i; ) /* loop a few times, before making important decisions */
436			{
437			now = get_clock ();
438			diff = ev_now - now;
439
440			if (fabs (odiff - diff) < MIN_TIMEJUMP)
441			return; /* all is well */
442
443			ev_now = ev_time ();
444			}
445
446			/* time jump detected, reschedule atimers */
447			for (i = 0; i < atimercnt; ++i)
448			{
449			struct ev_timer *w = atimers [i];
450			w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
451			}
452			}
453			else
454			{
455			if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
456			/* time jump detected, adjust rtimers */
457			for (i = 0; i < rtimercnt; ++i)
458			rtimers [i]->at += ev_now - now;
459
460			now = ev_now;
461			}
462			}
463
464	root	1.1	int ev_loop_done;
465
466	root	1.4	void ev_loop (int flags)
467	root	1.1	{
468			double block;
469			ev_loop_done = flags & EVLOOP_ONESHOT;
470
471	root	1.9	if (checkcnt)
472			{
473			queue_events (checks, checkcnt, EV_CHECK);
474			call_pending ();
475			}
476
477	root	1.1	do
478			{
479			/* update fd-related kernel structures */
480	root	1.5	fd_reify ();
481	root	1.1
482			/* calculate blocking time */
483	root	1.9	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
484	root	1.1	block = 0.;
485			else
486			{
487	root	1.4	block = MAX_BLOCKTIME;
488
489			if (rtimercnt)
490			{
491			ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
492			if (block > to) block = to;
493			}
494
495			if (atimercnt)
496			{
497			ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
498			if (block > to) block = to;
499			}
500
501	root	1.1	if (block < 0.) block = 0.;
502			}
503
504			method_poll (block);
505
506	root	1.4	/* update ev_now, do magic */
507			time_update ();
508
509	root	1.9	/* queue pending timers and reschedule them */
510	root	1.4	/* absolute timers first */
511			timers_reify (atimers, atimercnt, ev_now);
512			/* relative timers second */
513			timers_reify (rtimers, rtimercnt, now);
514	root	1.1
515	root	1.9	/* queue idle watchers unless io or timers are pending */
516			if (!pendingcnt)
517			queue_events (idles, idlecnt, EV_IDLE);
518
519			/* queue check and possibly idle watchers */
520			queue_events (checks, checkcnt, EV_CHECK);
521
522	root	1.1	call_pending ();
523			}
524			while (!ev_loop_done);
525			}
526
527	root	1.8	/*****************************************************************************/
528
529	root	1.1	static void
530			wlist_add (struct ev_watcher_list *head, struct ev_watcher_list elem)
531			{
532			elem->next = *head;
533			*head = elem;
534			}
535
536			static void
537			wlist_del (struct ev_watcher_list *head, struct ev_watcher_list elem)
538			{
539			while (*head)
540			{
541			if (*head == elem)
542			{
543			*head = elem->next;
544			return;
545			}
546
547			head = &(*head)->next;
548			}
549			}
550
551			static void
552			ev_start (struct ev_watcher *w, int active)
553			{
554			w->pending = 0;
555			w->active = active;
556			}
557
558			static void
559			ev_stop (struct ev_watcher *w)
560			{
561			if (w->pending)
562			pendings [w->pending - 1].w = 0;
563
564			w->active = 0;
565			/* nop */
566			}
567
568	root	1.8	/*****************************************************************************/
569
570	root	1.1	void
571			evio_start (struct ev_io *w)
572			{
573			if (ev_is_active (w))
574			return;
575
576			int fd = w->fd;
577
578			ev_start ((struct ev_watcher *)w, 1);
579			array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580			wlist_add ((struct ev_watcher_list *)&anfds[fd].head, (struct ev_watcher_list )w);
581
582			++fdchangecnt;
583			array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584			fdchanges [fdchangecnt - 1] = fd;
585			}
586
587			void
588			evio_stop (struct ev_io *w)
589			{
590			if (!ev_is_active (w))
591			return;
592
593			wlist_del ((struct ev_watcher_list *)&anfds[w->fd].head, (struct ev_watcher_list )w);
594			ev_stop ((struct ev_watcher *)w);
595
596			++fdchangecnt;
597			array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598			fdchanges [fdchangecnt - 1] = w->fd;
599			}
600
601			void
602			evtimer_start (struct ev_timer *w)
603			{
604			if (ev_is_active (w))
605			return;
606
607			if (w->is_abs)
608			{
609	root	1.2	/* this formula differs from the one in timer_reify becuse we do not round up */
610	root	1.1	if (w->repeat)
611			w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;
612	root	1.4
613			ev_start ((struct ev_watcher *)w, ++atimercnt);
614			array_needsize (atimers, atimermax, atimercnt, );
615			atimers [atimercnt - 1] = w;
616			upheap (atimers, atimercnt - 1);
617	root	1.1	}
618			else
619	root	1.4	{
620			w->at += now;
621
622			ev_start ((struct ev_watcher *)w, ++rtimercnt);
623			array_needsize (rtimers, rtimermax, rtimercnt, );
624			rtimers [rtimercnt - 1] = w;
625			upheap (rtimers, rtimercnt - 1);
626			}
627	root	1.1
628			}
629
630			void
631			evtimer_stop (struct ev_timer *w)
632			{
633			if (!ev_is_active (w))
634			return;
635
636	root	1.4	if (w->is_abs)
637	root	1.2	{
638	root	1.4	if (w->active < atimercnt--)
639			{
640			atimers [w->active - 1] = atimers [atimercnt];
641			downheap (atimers, atimercnt, w->active - 1);
642			}
643			}
644			else
645			{
646			if (w->active < rtimercnt--)
647			{
648			rtimers [w->active - 1] = rtimers [rtimercnt];
649			downheap (rtimers, rtimercnt, w->active - 1);
650			}
651	root	1.2	}
652
653	root	1.1	ev_stop ((struct ev_watcher *)w);
654			}
655
656			void
657			evsignal_start (struct ev_signal *w)
658			{
659			if (ev_is_active (w))
660			return;
661
662			ev_start ((struct ev_watcher *)w, 1);
663			array_needsize (signals, signalmax, w->signum, signals_init);
664	root	1.7	wlist_add ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);
665
666			if (!w->next)
667			{
668			struct sigaction sa;
669			sa.sa_handler = sighandler;
670			sigfillset (&sa.sa_mask);
671			sa.sa_flags = 0;
672			sigaction (w->signum, &sa, 0);
673			}
674	root	1.1	}
675
676			void
677			evsignal_stop (struct ev_signal *w)
678			{
679			if (!ev_is_active (w))
680			return;
681
682	root	1.7	wlist_del ((struct ev_watcher_list *)&signals [w->signum - 1].head, (struct ev_watcher_list )w);
683	root	1.1	ev_stop ((struct ev_watcher *)w);
684	root	1.7
685			if (!signals [w->signum - 1].head)
686			signal (w->signum, SIG_DFL);
687	root	1.1	}
688
689	root	1.9	void evidle_start (struct ev_idle *w)
690			{
691			if (ev_is_active (w))
692			return;
693
694			ev_start ((struct ev_watcher *)w, ++idlecnt);
695			array_needsize (idles, idlemax, idlecnt, );
696			idles [idlecnt - 1] = w;
697			}
698
699			void evidle_stop (struct ev_idle *w)
700			{
701			idles [w->active - 1] = idles [--idlecnt];
702			ev_stop ((struct ev_watcher *)w);
703			}
704
705			void evcheck_start (struct ev_check *w)
706			{
707			if (ev_is_active (w))
708			return;
709
710			ev_start ((struct ev_watcher *)w, ++checkcnt);
711			array_needsize (checks, checkmax, checkcnt, );
712			checks [checkcnt - 1] = w;
713			}
714
715			void evcheck_stop (struct ev_check *w)
716			{
717			checks [w->active - 1] = checks [--checkcnt];
718			ev_stop ((struct ev_watcher *)w);
719			}
720
721	root	1.1	/*****************************************************************************/
722			#if 1
723
724			static void
725			sin_cb (struct ev_io *w, int revents)
726			{
727			fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
728			}
729
730			static void
731			ocb (struct ev_timer *w, int revents)
732			{
733	root	1.4	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
734			evtimer_stop (w);
735			evtimer_start (w);
736	root	1.1	}
737
738	root	1.7	static void
739			scb (struct ev_signal *w, int revents)
740			{
741			fprintf (stderr, "signal %x,%d\n", revents, w->signum);
742			}
743
744	root	1.9	static void
745			gcb (struct ev_signal *w, int revents)
746			{
747			fprintf (stderr, "generic %x\n", revents);
748			}
749
750	root	1.1	int main (void)
751			{
752			struct ev_io sin;
753
754			ev_init (0);
755
756			evw_init (&sin, sin_cb, 55);
757			evio_set (&sin, 0, EV_READ);
758			evio_start (&sin);
759
760	root	1.4	struct ev_timer t[10000];
761	root	1.2
762	root	1.9	#if 0
763	root	1.2	int i;
764	root	1.4	for (i = 0; i < 10000; ++i)
765	root	1.2	{
766			struct ev_timer *w = t + i;
767			evw_init (w, ocb, i);
768	root	1.4	evtimer_set_abs (w, drand48 (), 0.99775533);
769	root	1.2	evtimer_start (w);
770			if (drand48 () < 0.5)
771			evtimer_stop (w);
772			}
773	root	1.4	#endif
774
775			struct ev_timer t1;
776			evw_init (&t1, ocb, 0);
777			evtimer_set_abs (&t1, 5, 10);
778			evtimer_start (&t1);
779	root	1.1
780	root	1.7	struct ev_signal sig;
781			evw_init (&sig, scb, 65535);
782			evsignal_set (&sig, SIGQUIT);
783			evsignal_start (&sig);
784
785	root	1.9	struct ev_check cw;
786			evw_init (&cw, gcb, 0);
787			evcheck_start (&cw);
788
789			struct ev_idle iw;
790			evw_init (&iw, gcb, 0);
791			evidle_start (&iw);
792
793	root	1.1	ev_loop (0);
794
795			return 0;
796			}
797
798			#endif
799
800
801
802