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Marc Alexander Lehmann 14 years ago
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commit
e566b7b403
  1. 133
      ev.c

133
ev.c

@ -761,6 +761,88 @@ fd_rearm_all (EV_P)
/*****************************************************************************/
/*
* at the moment we allow libev the luxury of two heaps,
* a small-code-size 2-heap one and a ~1.5kb larger 4-heap
* which is more cache-efficient.
* the difference is about 5% with 50000+ watchers.
*/
#define USE_4HEAP !EV_MINIMAL
#if USE_4HEAP
#define HEAP0 3 /* index of first element in heap */
/* towards the root */
void inline_speed
upheap (WT *heap, int k)
{
WT w = heap [k];
for (;;)
{
int p = ((k - HEAP0 - 1) / 4) + HEAP0;
if (p >= HEAP0 || heap [p]->at <= w->at)
break;
heap [k] = heap [p];
ev_active (heap [k]) = k;
k = p;
}
heap [k] = w;
ev_active (heap [k]) = k;
}
/* away from the root */
void inline_speed
downheap (WT *heap, int N, int k)
{
WT w = heap [k];
WT *E = heap + N + HEAP0;
for (;;)
{
ev_tstamp minat;
WT *minpos;
WT *pos = heap + 4 * (k - HEAP0) + HEAP0;
// find minimum child
if (expect_true (pos +3 < E))
{
(minpos = pos + 0), (minat = (*minpos)->at);
if (pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
if (pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
if (pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
}
else
{
if (pos >= E)
break;
(minpos = pos + 0), (minat = (*minpos)->at);
if (pos + 1 < E && pos [1]->at < minat) (minpos = pos + 1), (minat = (*minpos)->at);
if (pos + 2 < E && pos [2]->at < minat) (minpos = pos + 2), (minat = (*minpos)->at);
if (pos + 3 < E && pos [3]->at < minat) (minpos = pos + 3), (minat = (*minpos)->at);
}
if (w->at <= minat)
break;
ev_active (*minpos) = k;
heap [k] = *minpos;
k = minpos - heap;
}
heap [k] = w;
ev_active (heap [k]) = k;
}
#else // 4HEAP
#define HEAP0 1
/* towards the root */
void inline_speed
upheap (WT *heap, int k)
@ -797,21 +879,22 @@ downheap (WT *heap, int N, int k)
if (c > N)
break;
c += c < N && heap [c]->at > heap [c + 1]->at
c += c + 1 < N && heap [c]->at > heap [c + 1]->at
? 1 : 0;
if (w->at <= heap [c]->at)
break;
heap [k] = heap [c];
ev_active (heap [k]) = k;
((W)heap [k])->active = k;
k = c;
}
heap [k] = w;
ev_active (heap [k]) = k;
}
#endif
void inline_size
adjustheap (WT *heap, int N, int k)
@ -1488,9 +1571,9 @@ idle_reify (EV_P)
void inline_size
timers_reify (EV_P)
{
while (timercnt && ev_at (timers [1]) <= mn_now)
while (timercnt && ev_at (timers [HEAP0]) <= mn_now)
{
ev_timer *w = (ev_timer *)timers [1];
ev_timer *w = (ev_timer *)timers [HEAP0];
/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
@ -1503,7 +1586,7 @@ timers_reify (EV_P)
if (ev_at (w) < mn_now)
ev_at (w) = mn_now;
downheap (timers, timercnt, 1);
downheap (timers, timercnt, HEAP0);
}
else
ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
@ -1516,9 +1599,9 @@ timers_reify (EV_P)
void inline_size
periodics_reify (EV_P)
{
while (periodiccnt && ev_at (periodics [1]) <= ev_rt_now)
while (periodiccnt && ev_at (periodics [HEAP0]) <= ev_rt_now)
{
ev_periodic *w = (ev_periodic *)periodics [1];
ev_periodic *w = (ev_periodic *)periodics [HEAP0];
/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
@ -1534,7 +1617,7 @@ periodics_reify (EV_P)
ev_at (w) = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
if (ev_at (w) - ev_rt_now <= TIME_EPSILON) ev_at (w) += w->interval;
assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ev_at (w) > ev_rt_now));
downheap (periodics, periodiccnt, 1);
downheap (periodics, periodiccnt, HEAP0);
}
else
ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
@ -1560,8 +1643,8 @@ periodics_reschedule (EV_P)
}
/* now rebuild the heap */
for (i = periodiccnt >> 1; i--; )
downheap (periodics, periodiccnt, i);
for (i = periodiccnt >> 1; --i; )
downheap (periodics, periodiccnt, i + HEAP0);
}
#endif
@ -1706,14 +1789,14 @@ ev_loop (EV_P_ int flags)
if (timercnt)
{
ev_tstamp to = ev_at (timers [1]) - mn_now + backend_fudge;
ev_tstamp to = ev_at (timers [HEAP0]) - mn_now + backend_fudge;
if (waittime > to) waittime = to;
}
#if EV_PERIODIC_ENABLE
if (periodiccnt)
{
ev_tstamp to = ev_at (periodics [1]) - ev_rt_now + backend_fudge;
ev_tstamp to = ev_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
if (waittime > to) waittime = to;
}
#endif
@ -1893,10 +1976,10 @@ ev_timer_start (EV_P_ ev_timer *w)
assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
ev_start (EV_A_ (W)w, ++timercnt);
array_needsize (WT, timers, timermax, timercnt + 1, EMPTY2);
timers [timercnt] = (WT)w;
upheap (timers, timercnt);
ev_start (EV_A_ (W)w, ++timercnt + HEAP0 - 1);
array_needsize (WT, timers, timermax, timercnt + HEAP0, EMPTY2);
timers [ev_active (w)] = (WT)w;
upheap (timers, ev_active (w));
/*assert (("internal timer heap corruption", timers [ev_active (w)] == w));*/
}
@ -1913,9 +1996,9 @@ ev_timer_stop (EV_P_ ev_timer *w)
assert (("internal timer heap corruption", timers [active] == (WT)w));
if (expect_true (active < timercnt))
if (expect_true (active < timercnt + HEAP0 - 1))
{
timers [active] = timers [timercnt];
timers [active] = timers [timercnt + HEAP0 - 1];
adjustheap (timers, timercnt, active);
}
@ -1965,10 +2048,10 @@ ev_periodic_start (EV_P_ ev_periodic *w)
else
ev_at (w) = w->offset;
ev_start (EV_A_ (W)w, ++periodiccnt);
array_needsize (WT, periodics, periodicmax, periodiccnt + 1, EMPTY2);
periodics [periodiccnt] = (WT)w;
upheap (periodics, periodiccnt);
ev_start (EV_A_ (W)w, ++periodiccnt + HEAP0 - 1);
array_needsize (WT, periodics, periodicmax, periodiccnt + HEAP0, EMPTY2);
periodics [ev_active (w)] = (WT)w;
upheap (periodics, ev_active (w));
/*assert (("internal periodic heap corruption", periodics [ev_active (w)] == w));*/
}
@ -1985,9 +2068,9 @@ ev_periodic_stop (EV_P_ ev_periodic *w)
assert (("internal periodic heap corruption", periodics [active] == (WT)w));
if (expect_true (active < periodiccnt))
if (expect_true (active < periodiccnt + HEAP0 - 1))
{
periodics [active] = periodics [periodiccnt];
periodics [active] = periodics [periodiccnt + HEAP0 - 1];
adjustheap (periodics, periodiccnt, active);
}

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