X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/1e5704b50a7d4be558050116622685a63b78ce5a..c56a8061de2b5b4b9760ed49d4600bf40991b797:/ev.c?ds=sidebyside diff --git a/ev.c b/ev.c index 7c278f3..1d0a5bf 100644 --- a/ev.c +++ b/ev.c @@ -218,9 +218,19 @@ extern "C" { /**/ +/* + * This is used to avoid floating point rounding problems. + * It is added to ev_rt_now when scheduling periodics + * to ensure progress, time-wise, even when rounding + * errors are against us. + * This value is good at least till the year 4000. + * Better solutions welcome. + */ +#define TIME_EPSILON 0.0001220703125 /* 1/8192 */ + #define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */ #define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */ -/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */ +/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */ #if __GNUC__ >= 3 # define expect(expr,value) __builtin_expect ((expr),(value)) @@ -468,7 +478,7 @@ ev_feed_event (EV_P_ void *w, int revents) } } -void inline_size +void inline_speed queue_events (EV_P_ W *events, int eventcnt, int type) { int i; @@ -525,10 +535,10 @@ fd_reify (EV_P) ANFD *anfd = anfds + fd; ev_io *w; - int events = 0; + unsigned char events = 0; for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next) - events |= w->events; + events |= (unsigned char)w->events; #if EV_SELECT_IS_WINSOCKET if (events) @@ -539,26 +549,33 @@ fd_reify (EV_P) } #endif - anfd->reify = 0; + { + unsigned char o_events = anfd->events; + unsigned char o_reify = anfd->reify; + + anfd->reify = 0; + anfd->events = events; - backend_modify (EV_A_ fd, anfd->events, events); - anfd->events = events; + if (o_events != events || o_reify & EV_IOFDSET) + backend_modify (EV_A_ fd, o_events, events); + } } fdchangecnt = 0; } void inline_size -fd_change (EV_P_ int fd) +fd_change (EV_P_ int fd, int flags) { - if (expect_false (anfds [fd].reify)) - return; - - anfds [fd].reify = 1; + unsigned char reify = anfds [fd].reify; + anfds [fd].reify |= flags; - ++fdchangecnt; - array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2); - fdchanges [fdchangecnt - 1] = fd; + if (expect_true (!reify)) + { + ++fdchangecnt; + array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2); + fdchanges [fdchangecnt - 1] = fd; + } } void inline_speed @@ -619,7 +636,7 @@ fd_rearm_all (EV_P) if (anfds [fd].events) { anfds [fd].events = 0; - fd_change (EV_A_ fd); + fd_change (EV_A_ fd, EV_IOFDSET | 1); } } @@ -630,16 +647,20 @@ upheap (WT *heap, int k) { WT w = heap [k]; - while (k && heap [k >> 1]->at > w->at) + while (k) { - heap [k] = heap [k >> 1]; + int p = (k - 1) >> 1; + + if (heap [p]->at <= w->at) + break; + + heap [k] = heap [p]; ((W)heap [k])->active = k + 1; - k >>= 1; + k = p; } heap [k] = w; ((W)heap [k])->active = k + 1; - } void inline_speed @@ -647,19 +668,23 @@ downheap (WT *heap, int N, int k) { WT w = heap [k]; - while (k < (N >> 1)) + for (;;) { - int j = k << 1; + int c = (k << 1) + 1; - if (j + 1 < N && heap [j]->at > heap [j + 1]->at) - ++j; + if (c >= N) + break; + + c += c + 1 < N && heap [c]->at > heap [c + 1]->at + ? 1 : 0; - if (w->at <= heap [j]->at) + if (w->at <= heap [c]->at) break; - heap [k] = heap [j]; + heap [k] = heap [c]; ((W)heap [k])->active = k + 1; - k = j; + + k = c; } heap [k] = w; @@ -776,7 +801,7 @@ siginit (EV_P) /*****************************************************************************/ -static ev_child *childs [EV_PID_HASHSIZE]; +static WL childs [EV_PID_HASHSIZE]; #ifndef _WIN32 @@ -1198,7 +1223,7 @@ timers_reify (EV_P) { while (timercnt && ((WT)timers [0])->at <= mn_now) { - ev_timer *w = timers [0]; + ev_timer *w = (ev_timer *)timers [0]; /*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/ @@ -1211,7 +1236,7 @@ timers_reify (EV_P) if (((WT)w)->at < mn_now) ((WT)w)->at = mn_now; - downheap ((WT *)timers, timercnt, 0); + downheap (timers, timercnt, 0); } else ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */ @@ -1226,22 +1251,23 @@ periodics_reify (EV_P) { while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now) { - ev_periodic *w = periodics [0]; + ev_periodic *w = (ev_periodic *)periodics [0]; /*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/ /* first reschedule or stop timer */ if (w->reschedule_cb) { - ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001220703125 /* 1/8192 */); + ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON); assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now)); - downheap ((WT *)periodics, periodiccnt, 0); + downheap (periodics, periodiccnt, 0); } else if (w->interval) { - ((WT)w)->at = w->offset + (floor ((ev_rt_now - w->offset) / w->interval) + 1.) * w->interval; + ((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval; + if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval; assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now)); - downheap ((WT *)periodics, periodiccnt, 0); + downheap (periodics, periodiccnt, 0); } else ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */ @@ -1258,7 +1284,7 @@ periodics_reschedule (EV_P) /* adjust periodics after time jump */ for (i = 0; i < periodiccnt; ++i) { - ev_periodic *w = periodics [i]; + ev_periodic *w = (ev_periodic *)periodics [i]; if (w->reschedule_cb) ((WT)w)->at = w->reschedule_cb (w, ev_rt_now); @@ -1268,7 +1294,7 @@ periodics_reschedule (EV_P) /* now rebuild the heap */ for (i = periodiccnt >> 1; i--; ) - downheap ((WT *)periodics, periodiccnt, i); + downheap (periodics, periodiccnt, i); } #endif @@ -1295,74 +1321,65 @@ idle_reify (EV_P) } #endif -int inline_size -time_update_monotonic (EV_P) -{ - mn_now = get_clock (); - - if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5)) - { - ev_rt_now = rtmn_diff + mn_now; - return 0; - } - else - { - now_floor = mn_now; - ev_rt_now = ev_time (); - return 1; - } -} - -void inline_size -time_update (EV_P) +void inline_speed +time_update (EV_P_ ev_tstamp max_block) { int i; #if EV_USE_MONOTONIC if (expect_true (have_monotonic)) { - if (time_update_monotonic (EV_A)) + ev_tstamp odiff = rtmn_diff; + + mn_now = get_clock (); + + /* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */ + /* interpolate in the meantime */ + if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5)) { - ev_tstamp odiff = rtmn_diff; - - /* loop a few times, before making important decisions. - * on the choice of "4": one iteration isn't enough, - * in case we get preempted during the calls to - * ev_time and get_clock. a second call is almost guaranteed - * to succeed in that case, though. and looping a few more times - * doesn't hurt either as we only do this on time-jumps or - * in the unlikely event of having been preempted here. - */ - for (i = 4; --i; ) - { - rtmn_diff = ev_rt_now - mn_now; + ev_rt_now = rtmn_diff + mn_now; + return; + } + + now_floor = mn_now; + ev_rt_now = ev_time (); - if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP) - return; /* all is well */ + /* loop a few times, before making important decisions. + * on the choice of "4": one iteration isn't enough, + * in case we get preempted during the calls to + * ev_time and get_clock. a second call is almost guaranteed + * to succeed in that case, though. and looping a few more times + * doesn't hurt either as we only do this on time-jumps or + * in the unlikely event of having been preempted here. + */ + for (i = 4; --i; ) + { + rtmn_diff = ev_rt_now - mn_now; - ev_rt_now = ev_time (); - mn_now = get_clock (); - now_floor = mn_now; - } + if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP) + return; /* all is well */ + + ev_rt_now = ev_time (); + mn_now = get_clock (); + now_floor = mn_now; + } # if EV_PERIODIC_ENABLE - periodics_reschedule (EV_A); + periodics_reschedule (EV_A); # endif - /* no timer adjustment, as the monotonic clock doesn't jump */ - /* timers_reschedule (EV_A_ rtmn_diff - odiff) */ - } + /* no timer adjustment, as the monotonic clock doesn't jump */ + /* timers_reschedule (EV_A_ rtmn_diff - odiff) */ } else #endif { ev_rt_now = ev_time (); - if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP)) + if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP)) { #if EV_PERIODIC_ENABLE periodics_reschedule (EV_A); #endif - /* adjust timers. this is easy, as the offset is the same for all of them */ for (i = 0; i < timercnt; ++i) ((WT)timers [i])->at += ev_rt_now - mn_now; @@ -1442,15 +1459,7 @@ ev_loop (EV_P_ int flags) else { /* update time to cancel out callback processing overhead */ -#if EV_USE_MONOTONIC - if (expect_true (have_monotonic)) - time_update_monotonic (EV_A); - else -#endif - { - ev_rt_now = ev_time (); - mn_now = ev_rt_now; - } + time_update (EV_A_ 1e100); block = MAX_BLOCKTIME; @@ -1473,10 +1482,10 @@ ev_loop (EV_P_ int flags) ++loop_count; backend_poll (EV_A_ block); - } - /* update ev_rt_now, do magic */ - time_update (EV_A); + /* update ev_rt_now, do magic */ + time_update (EV_A_ block); + } /* queue pending timers and reschedule them */ timers_reify (EV_A); /* relative timers called last */ @@ -1597,9 +1606,10 @@ ev_io_start (EV_P_ ev_io *w) ev_start (EV_A_ (W)w, 1); array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init); - wlist_add ((WL *)&anfds[fd].head, (WL)w); + wlist_add (&anfds[fd].head, (WL)w); - fd_change (EV_A_ fd); + fd_change (EV_A_ fd, w->events & EV_IOFDSET | 1); + w->events &= ~EV_IOFDSET; } void noinline @@ -1611,10 +1621,10 @@ ev_io_stop (EV_P_ ev_io *w) assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax)); - wlist_del ((WL *)&anfds[w->fd].head, (WL)w); + wlist_del (&anfds[w->fd].head, (WL)w); ev_stop (EV_A_ (W)w); - fd_change (EV_A_ w->fd); + fd_change (EV_A_ w->fd, 1); } void noinline @@ -1628,9 +1638,9 @@ 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 (ev_timer *, timers, timermax, timercnt, EMPTY2); - timers [timercnt - 1] = w; - upheap ((WT *)timers, timercnt - 1); + array_needsize (WT, timers, timermax, timercnt, EMPTY2); + timers [timercnt - 1] = (WT)w; + upheap (timers, timercnt - 1); /*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/ } @@ -1642,7 +1652,7 @@ ev_timer_stop (EV_P_ ev_timer *w) if (expect_false (!ev_is_active (w))) return; - assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w)); + assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w)); { int active = ((W)w)->active; @@ -1650,7 +1660,7 @@ ev_timer_stop (EV_P_ ev_timer *w) if (expect_true (--active < --timercnt)) { timers [active] = timers [timercnt]; - adjustheap ((WT *)timers, timercnt, active); + adjustheap (timers, timercnt, active); } } @@ -1667,7 +1677,7 @@ ev_timer_again (EV_P_ ev_timer *w) if (w->repeat) { ((WT)w)->at = mn_now + w->repeat; - adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1); + adjustheap (timers, timercnt, ((W)w)->active - 1); } else ev_timer_stop (EV_A_ w); @@ -1698,9 +1708,9 @@ ev_periodic_start (EV_P_ ev_periodic *w) ((WT)w)->at = w->offset; ev_start (EV_A_ (W)w, ++periodiccnt); - array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2); - periodics [periodiccnt - 1] = w; - upheap ((WT *)periodics, periodiccnt - 1); + array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2); + periodics [periodiccnt - 1] = (WT)w; + upheap (periodics, periodiccnt - 1); /*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/ } @@ -1712,7 +1722,7 @@ ev_periodic_stop (EV_P_ ev_periodic *w) if (expect_false (!ev_is_active (w))) return; - assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w)); + assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w)); { int active = ((W)w)->active; @@ -1720,7 +1730,7 @@ ev_periodic_stop (EV_P_ ev_periodic *w) if (expect_true (--active < --periodiccnt)) { periodics [active] = periodics [periodiccnt]; - adjustheap ((WT *)periodics, periodiccnt, active); + adjustheap (periodics, periodiccnt, active); } } @@ -1751,9 +1761,22 @@ ev_signal_start (EV_P_ ev_signal *w) assert (("ev_signal_start called with illegal signal number", w->signum > 0)); + { +#ifndef _WIN32 + sigset_t full, prev; + sigfillset (&full); + sigprocmask (SIG_SETMASK, &full, &prev); +#endif + + array_needsize (ANSIG, signals, signalmax, w->signum, signals_init); + +#ifndef _WIN32 + sigprocmask (SIG_SETMASK, &prev, 0); +#endif + } + ev_start (EV_A_ (W)w, 1); - array_needsize (ANSIG, signals, signalmax, w->signum, signals_init); - wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); + wlist_add (&signals [w->signum - 1].head, (WL)w); if (!((WL)w)->next) { @@ -1776,7 +1799,7 @@ ev_signal_stop (EV_P_ ev_signal *w) if (expect_false (!ev_is_active (w))) return; - wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); + wlist_del (&signals [w->signum - 1].head, (WL)w); ev_stop (EV_A_ (W)w); if (!signals [w->signum - 1].head) @@ -1793,7 +1816,7 @@ ev_child_start (EV_P_ ev_child *w) return; ev_start (EV_A_ (W)w, 1); - wlist_add ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w); + wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w); } void @@ -1803,7 +1826,7 @@ ev_child_stop (EV_P_ ev_child *w) if (expect_false (!ev_is_active (w))) return; - wlist_del ((WL *)&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w); + wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w); ev_stop (EV_A_ (W)w); }