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authorroot <root>2007-10-31 09:23:17 +0000
committerroot <root>2007-10-31 09:23:17 +0000
commit04c8cb9913a370451296919b6dd2567793de9a75 (patch)
tree882093de940864c289999936bc0310d6337cee3f /ev.c
parent89981d101c9d70b930deeea27f840b8a03e4281e (diff)
*** empty log message ***
Diffstat (limited to 'ev.c')
-rw-r--r--ev.c218
1 files changed, 134 insertions, 84 deletions
diff --git a/ev.c b/ev.c
index 5df23b6..1e54f21 100644
--- a/ev.c
+++ b/ev.c
@@ -11,6 +11,8 @@
#include <sys/time.h>
#include <time.h>
+#define HAVE_EPOLL 1
+
#ifndef HAVE_MONOTONIC
# ifdef CLOCK_MONOTONIC
# define HAVE_MONOTONIC 1
@@ -42,8 +44,13 @@ struct ev_watcher_list {
EV_WATCHER_LIST (ev_watcher_list);
};
+struct ev_watcher_time {
+ EV_WATCHER_TIME (ev_watcher_time);
+};
+
typedef struct ev_watcher *W;
typedef struct ev_watcher_list *WL;
+typedef struct ev_watcher_time *WT;
static ev_tstamp now, diff; /* monotonic clock */
ev_tstamp ev_now;
@@ -165,16 +172,16 @@ queue_events (W *events, int eventcnt, int type)
/*****************************************************************************/
-static struct ev_timer **atimers;
-static int atimermax, atimercnt;
+static struct ev_timer **timers;
+static int timermax, timercnt;
-static struct ev_timer **rtimers;
-static int rtimermax, rtimercnt;
+static struct ev_periodic **periodics;
+static int periodicmax, periodiccnt;
static void
-upheap (struct ev_timer **timers, int k)
+upheap (WT *timers, int k)
{
- struct ev_timer *w = timers [k];
+ WT w = timers [k];
while (k && timers [k >> 1]->at > w->at)
{
@@ -189,9 +196,9 @@ upheap (struct ev_timer **timers, int k)
}
static void
-downheap (struct ev_timer **timers, int N, int k)
+downheap (WT *timers, int N, int k)
{
- struct ev_timer *w = timers [k];
+ WT w = timers [k];
while (k < (N >> 1))
{
@@ -327,7 +334,7 @@ int ev_init (int flags)
if (ev_method)
{
- evw_init (&sigev, sigcb, 0);
+ evw_init (&sigev, sigcb);
siginit ();
}
@@ -408,7 +415,7 @@ call_pending ()
}
static void
-timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
+timers_reify ()
{
while (timercnt && timers [0]->at <= now)
{
@@ -417,37 +424,79 @@ timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
/* 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);
+ w->at = now + w->repeat;
+ assert (("timer timeout in the past, negative repeat?", w->at > now));
+ downheap ((WT *)timers, timercnt, 0);
}
else
+ evtimer_stop (w); /* nonrepeating: stop timer */
+
+ event ((W)w, EV_TIMEOUT);
+ }
+}
+
+static void
+periodics_reify ()
+{
+ while (periodiccnt && periodics [0]->at <= ev_now)
+ {
+ struct ev_periodic *w = periodics [0];
+
+ /* first reschedule or stop timer */
+ if (w->interval)
{
- evtimer_stop (w); /* nonrepeating: stop timer */
- --timercnt; /* maybe pass by reference instead? */
+ w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;
+ assert (("periodic timeout in the past, negative interval?", w->at > ev_now));
+ downheap ((WT *)periodics, periodiccnt, 0);
}
+ else
+ evperiodic_stop (w); /* nonrepeating: stop timer */
event ((W)w, EV_TIMEOUT);
}
}
static void
+time_jump (ev_tstamp diff)
+{
+ int i;
+
+ /* adjust periodics */
+ for (i = 0; i < periodiccnt; ++i)
+ {
+ struct ev_periodic *w = periodics [i];
+
+ if (w->interval)
+ {
+ ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;
+
+ if (fabs (diff) >= 1e-4)
+ {
+ evperiodic_stop (w);
+ evperiodic_start (w);
+
+ i = 0; /* restart loop, inefficient, but time jumps should be rare */
+ }
+ }
+ }
+
+ /* adjust timers. this is easy, as the offset is the same for all */
+ for (i = 0; i < timercnt; ++i)
+ timers [i]->at += diff;
+}
+
+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 */
+ for (i = 4; --i; ) /* loop a few times, before making important decisions */
{
now = get_clock ();
diff = ev_now - now;
@@ -458,19 +507,12 @@ time_update ()
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;
- }
+ time_jump (diff - odiff);
}
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;
+ time_jump (ev_now - now);
now = ev_now;
}
@@ -495,21 +537,25 @@ void ev_loop (int flags)
fd_reify ();
/* calculate blocking time */
+
+ /* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */
+ ev_now = ev_time ();
+
if (flags & EVLOOP_NONBLOCK || idlecnt)
block = 0.;
else
{
block = MAX_BLOCKTIME;
- if (rtimercnt)
+ if (timercnt)
{
- ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;
+ ev_tstamp to = timers [0]->at - get_clock () + method_fudge;
if (block > to) block = to;
}
- if (atimercnt)
+ if (periodiccnt)
{
- ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;
+ ev_tstamp to = periodics [0]->at - ev_now + method_fudge;
if (block > to) block = to;
}
@@ -522,10 +568,8 @@ void ev_loop (int flags)
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);
+ periodics_reify (); /* absolute timers first */
+ timers_reify (); /* relative timers second */
/* queue idle watchers unless io or timers are pending */
if (!pendingcnt)
@@ -612,33 +656,19 @@ evio_stop (struct ev_io *w)
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 ((W)w, ++atimercnt);
- array_needsize (atimers, atimermax, atimercnt, );
- atimers [atimercnt - 1] = w;
- upheap (atimers, atimercnt - 1);
- }
- else
- {
- w->at += now;
-
- ev_start ((W)w, ++rtimercnt);
- array_needsize (rtimers, rtimermax, rtimercnt, );
- rtimers [rtimercnt - 1] = w;
- upheap (rtimers, rtimercnt - 1);
- }
+ w->at += now;
+ ev_start ((W)w, ++timercnt);
+ array_needsize (timers, timermax, timercnt, );
+ timers [timercnt - 1] = w;
+ upheap ((WT *)timers, timercnt - 1);
}
void
@@ -647,21 +677,41 @@ evtimer_stop (struct ev_timer *w)
if (!ev_is_active (w))
return;
- if (w->is_abs)
+ if (w->active < timercnt--)
{
- if (w->active < atimercnt--)
- {
- atimers [w->active - 1] = atimers [atimercnt];
- downheap (atimers, atimercnt, w->active - 1);
- }
+ timers [w->active - 1] = timers [timercnt];
+ downheap ((WT *)timers, timercnt, w->active - 1);
}
- else
+
+ ev_stop ((W)w);
+}
+
+void
+evperiodic_start (struct ev_periodic *w)
+{
+ if (ev_is_active (w))
+ return;
+
+ /* this formula differs from the one in periodic_reify because we do not always round up */
+ if (w->interval)
+ w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;
+
+ ev_start ((W)w, ++periodiccnt);
+ array_needsize (periodics, periodicmax, periodiccnt, );
+ periodics [periodiccnt - 1] = w;
+ upheap ((WT *)periodics, periodiccnt - 1);
+}
+
+void
+evperiodic_stop (struct ev_periodic *w)
+{
+ if (!ev_is_active (w))
+ return;
+
+ if (w->active < periodiccnt--)
{
- if (w->active < rtimercnt--)
- {
- rtimers [w->active - 1] = rtimers [rtimercnt];
- downheap (rtimers, rtimercnt, w->active - 1);
- }
+ periodics [w->active - 1] = periodics [periodiccnt];
+ downheap ((WT *)periodics, periodiccnt, w->active - 1);
}
ev_stop ((W)w);
@@ -734,7 +784,9 @@ void evcheck_stop (struct ev_check *w)
/*****************************************************************************/
-#if 0
+#if 1
+
+struct ev_io wio;
static void
sin_cb (struct ev_io *w, int revents)
@@ -754,23 +806,23 @@ static void
scb (struct ev_signal *w, int revents)
{
fprintf (stderr, "signal %x,%d\n", revents, w->signum);
+ evio_stop (&wio);
+ evio_start (&wio);
}
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);
+ evio_init (&wio, sin_cb, 0, EV_READ);
+ evio_start (&wio);
struct ev_timer t[10000];
@@ -780,7 +832,7 @@ int main (void)
{
struct ev_timer *w = t + i;
evw_init (w, ocb, i);
- evtimer_set_abs (w, drand48 (), 0.99775533);
+ evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
evtimer_start (w);
if (drand48 () < 0.5)
evtimer_stop (w);
@@ -788,21 +840,19 @@ int main (void)
#endif
struct ev_timer t1;
- evw_init (&t1, ocb, 0);
- evtimer_set_abs (&t1, 5, 10);
+ evtimer_init (&t1, ocb, 5, 10);
evtimer_start (&t1);
struct ev_signal sig;
- evw_init (&sig, scb, 65535);
- evsignal_set (&sig, SIGQUIT);
+ evsignal_init (&sig, scb, SIGQUIT);
evsignal_start (&sig);
struct ev_check cw;
- evw_init (&cw, gcb, 0);
+ evcheck_init (&cw, gcb);
evcheck_start (&cw);
struct ev_idle iw;
- evw_init (&iw, gcb, 0);
+ evidle_init (&iw, gcb);
evidle_start (&iw);
ev_loop (0);