X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/6c9b968485dc8690f81ae6626c07a82a4e085eb1..49a82c163f76e2916974ec3eac8d395662e7187b:/ev.c diff --git a/ev.c b/ev.c index 5b59ae1..aefc9df 100644 --- a/ev.c +++ b/ev.c @@ -11,26 +11,34 @@ #include #include -#ifdef CLOCK_MONOTONIC -# define HAVE_MONOTONIC 1 +#define HAVE_EPOLL 1 + +#ifndef HAVE_MONOTONIC +# ifdef CLOCK_MONOTONIC +# define HAVE_MONOTONIC 1 +# endif #endif -#define HAVE_REALTIME 1 -#define HAVE_EPOLL 1 -#define HAVE_SELECT 1 +#ifndef HAVE_SELECT +# define HAVE_SELECT 1 +#endif + +#ifndef HAVE_EPOLL +# define HAVE_EPOLL 0 +#endif + +#ifndef HAVE_REALTIME +# define HAVE_REALTIME 1 /* posix requirement, but might be slower */ +#endif #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); -}; +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; @@ -77,7 +85,6 @@ get_clock (void) 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; \ @@ -110,7 +117,7 @@ anfds_init (ANFD *base, int count) typedef struct { - struct ev_watcher *w; + W w; int events; } ANPENDING; @@ -118,7 +125,7 @@ static ANPENDING *pendings; static int pendingmax, pendingcnt; static void -event (struct ev_watcher *w, int events) +event (W w, int events) { w->pending = ++pendingcnt; array_needsize (pendings, pendingmax, pendingcnt, ); @@ -137,12 +144,12 @@ fd_event (int fd, int events) int ev = w->events & events; if (ev) - event ((struct ev_watcher *)w, ev); + event ((W)w, ev); } } static void -queue_events (struct ev_watcher **events, int eventcnt, int type) +queue_events (W *events, int eventcnt, int type) { int i; @@ -152,16 +159,16 @@ queue_events (struct ev_watcher **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) { @@ -176,9 +183,9 @@ 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)) { @@ -252,7 +259,7 @@ sigcb (struct ev_io *iow, int revents) signals [sig].gotsig = 0; for (w = signals [sig].head; w; w = w->next) - event ((struct ev_watcher *)w, EV_SIGNAL); + event ((W)w, EV_SIGNAL); } } @@ -314,7 +321,7 @@ int ev_init (int flags) if (ev_method) { - evw_init (&sigev, sigcb, 0); + evw_init (&sigev, sigcb); siginit (); } @@ -325,10 +332,12 @@ int ev_init (int flags) void ev_prefork (void) { + /* nop */ } void ev_postfork_parent (void) { + /* nop */ } void ev_postfork_child (void) @@ -393,7 +402,7 @@ call_pending () } static void -timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now) +timers_reify () { while (timercnt && timers [0]->at <= now) { @@ -402,22 +411,60 @@ 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; + 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 */ - assert (w->at > now); + event ((W)w, EV_TIMEOUT); + } +} - downheap (timers, timercnt, 0); +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) + { + 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 +periodics_reschedule (ev_tstamp diff) +{ + int i; + + /* adjust periodics after time jump */ + for (i = 0; i < periodiccnt; ++i) + { + struct ev_periodic *w = periodics [i]; + + if (w->interval) { - evtimer_stop (w); /* nonrepeating: stop timer */ - --timercnt; /* maybe pass by reference instead? */ - } + ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval; + + if (fabs (diff) >= 1e-4) + { + evperiodic_stop (w); + evperiodic_start (w); - event ((struct ev_watcher *)w, EV_TIMEOUT); + i = 0; /* restart loop, inefficient, but time jumps should be rare */ + } + } } } @@ -425,14 +472,14 @@ 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; @@ -443,19 +490,19 @@ 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; - } + periodics_reschedule (diff - odiff); + /* no timer adjustment, as the monotonic clock doesn't jump */ } 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; + { + periodics_reschedule (ev_now - now); + + /* adjust timers. this is easy, as the offset is the same for all */ + for (i = 0; i < timercnt; ++i) + timers [i]->at += diff; + } now = ev_now; } @@ -466,11 +513,11 @@ int ev_loop_done; void ev_loop (int flags) { double block; - ev_loop_done = flags & EVLOOP_ONESHOT; + ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0; if (checkcnt) { - queue_events (checks, checkcnt, EV_CHECK); + queue_events ((W *)checks, checkcnt, EV_CHECK); call_pending (); } @@ -480,21 +527,25 @@ 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 - (have_monotonic ? get_clock () : ev_now) + 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; } @@ -507,34 +558,35 @@ 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) - queue_events (idles, idlecnt, EV_IDLE); + queue_events ((W *)idles, idlecnt, EV_IDLE); /* queue check and possibly idle watchers */ - queue_events (checks, checkcnt, EV_CHECK); + queue_events ((W *)checks, checkcnt, EV_CHECK); call_pending (); } while (!ev_loop_done); + + if (ev_loop_done != 2) + ev_loop_done = 0; } /*****************************************************************************/ static void -wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem) +wlist_add (WL *head, WL elem) { elem->next = *head; *head = elem; } static void -wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) +wlist_del (WL *head, WL elem) { while (*head) { @@ -549,20 +601,19 @@ wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem) } static void -ev_start (struct ev_watcher *w, int active) +ev_start (W w, int active) { w->pending = 0; w->active = active; } static void -ev_stop (struct ev_watcher *w) +ev_stop (W w) { if (w->pending) pendings [w->pending - 1].w = 0; w->active = 0; - /* nop */ } /*****************************************************************************/ @@ -575,9 +626,9 @@ evio_start (struct ev_io *w) int fd = w->fd; - ev_start ((struct ev_watcher *)w, 1); + ev_start ((W)w, 1); array_needsize (anfds, anfdmax, fd + 1, anfds_init); - wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w); + wlist_add ((WL *)&anfds[fd].head, (WL)w); ++fdchangecnt; array_needsize (fdchanges, fdchangemax, fdchangecnt, ); @@ -590,41 +641,29 @@ 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); + wlist_del ((WL *)&anfds[w->fd].head, (WL)w); + ev_stop ((W)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; + w->at += now; - ev_start ((struct ev_watcher *)w, ++rtimercnt); - array_needsize (rtimers, rtimermax, rtimercnt, ); - rtimers [rtimercnt - 1] = w; - upheap (rtimers, rtimercnt - 1); - } + assert (("timer repeat value less than zero not allowed", w->repeat >= 0.)); + ev_start ((W)w, ++timercnt); + array_needsize (timers, timermax, timercnt, ); + timers [timercnt - 1] = w; + upheap ((WT *)timers, timercnt - 1); } void @@ -633,24 +672,65 @@ 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 + + w->at = w->repeat; + + ev_stop ((W)w); +} + +void +evtimer_again (struct ev_timer *w) +{ + if (ev_is_active (w)) { - if (w->active < rtimercnt--) + if (w->repeat) { - rtimers [w->active - 1] = rtimers [rtimercnt]; - downheap (rtimers, rtimercnt, w->active - 1); + w->at = now + w->repeat; + downheap ((WT *)timers, timercnt, w->active - 1); } + else + evtimer_stop (w); } + else if (w->repeat) + evtimer_start (w); +} - ev_stop ((struct ev_watcher *)w); +void +evperiodic_start (struct ev_periodic *w) +{ + if (ev_is_active (w)) + return; + + assert (("periodic interval value less than zero not allowed", w->interval >= 0.)); + + /* 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--) + { + periodics [w->active - 1] = periodics [periodiccnt]; + downheap ((WT *)periodics, periodiccnt, w->active - 1); + } + + ev_stop ((W)w); } void @@ -659,9 +739,9 @@ evsignal_start (struct ev_signal *w) if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, 1); + ev_start ((W)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); + wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w); if (!w->next) { @@ -679,8 +759,8 @@ 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); + wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w); + ev_stop ((W)w); if (!signals [w->signum - 1].head) signal (w->signum, SIG_DFL); @@ -691,7 +771,7 @@ void evidle_start (struct ev_idle *w) if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, ++idlecnt); + ev_start ((W)w, ++idlecnt); array_needsize (idles, idlemax, idlecnt, ); idles [idlecnt - 1] = w; } @@ -699,7 +779,7 @@ void evidle_start (struct ev_idle *w) void evidle_stop (struct ev_idle *w) { idles [w->active - 1] = idles [--idlecnt]; - ev_stop ((struct ev_watcher *)w); + ev_stop ((W)w); } void evcheck_start (struct ev_check *w) @@ -707,7 +787,7 @@ void evcheck_start (struct ev_check *w) if (ev_is_active (w)) return; - ev_start ((struct ev_watcher *)w, ++checkcnt); + ev_start ((W)w, ++checkcnt); array_needsize (checks, checkmax, checkcnt, ); checks [checkcnt - 1] = w; } @@ -715,11 +795,14 @@ void evcheck_start (struct ev_check *w) void evcheck_stop (struct ev_check *w) { checks [w->active - 1] = checks [--checkcnt]; - ev_stop ((struct ev_watcher *)w); + ev_stop ((W)w); } /*****************************************************************************/ -#if 1 + +#if 0 + +struct ev_io wio; static void sin_cb (struct ev_io *w, int revents) @@ -739,23 +822,23 @@ 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]; @@ -765,7 +848,7 @@ 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); @@ -773,21 +856,19 @@ 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);