#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
+#ifndef HAVE_MONOTONIC
+# ifdef CLOCK_MONOTONIC
+# define HAVE_MONOTONIC 1
+# endif
#endif
-#define HAVE_EPOLL 1
-#define HAVE_REALTIME 1
-#define HAVE_SELECT 0
+#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"
EV_WATCHER_LIST (ev_watcher_list);
};
+typedef struct ev_watcher *W;
+typedef struct ev_watcher_list *WL;
+
+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_reify)(void);
+static void (*method_modify)(int fd, int oev, int nev);
static void (*method_poll)(ev_tstamp timeout);
+/*****************************************************************************/
+
ev_tstamp
ev_time (void)
{
#define array_needsize(base,cur,cnt,init) \
if ((cnt) > cur) \
{ \
- int newcnt = cur; \
- do \
- { \
- newcnt += (newcnt >> 1) + 16; \
- } \
- while ((cnt) > newcnt); \
+ 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;
typedef struct
{
- struct ev_watcher *w;
+ W w;
int events;
} ANPENDING;
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, );
int ev = w->events & events;
if (ev)
- event ((struct ev_watcher *)w, ev);
+ event ((W)w, ev);
}
}
-static struct ev_timer **timers;
-static int timermax, timercnt;
+static void
+queue_events (W *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 (int k)
+upheap (struct ev_timer **timers, int k)
{
struct ev_timer *w = timers [k];
}
static void
-downheap (int k)
+downheap (struct ev_timer **timers, int N, int k)
{
struct ev_timer *w = timers [k];
- while (k <= (timercnt >> 1))
+ while (k < (N >> 1))
{
int j = k << 1;
- if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)
+ 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;
+ timers [k]->active = k + 1;
k = j;
}
timers [k]->active = k + 1;
}
-static struct ev_signal **signals;
-static int signalmax, signalcnt;
+/*****************************************************************************/
+
+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 (struct ev_signal **base, int count)
+signals_init (ANSIG *base, int count)
{
while (count--)
- *base++ = 0;
+ {
+ 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 ((W)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
#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 (epoll_init (flags))
- return ev_method;
+ if (ev_method == EVMETHOD_NONE) epoll_init (flags);
#endif
#if HAVE_SELECT
- if (select_init (flags))
- return ev_method;
+ if (ev_method == EVMETHOD_NONE) select_init (flags);
#endif
- ev_method = EVMETHOD_NONE;
+ if (ev_method)
+ {
+ evw_init (&sigev, sigcb, 0);
+ siginit ();
+ }
+
return ev_method;
}
+/*****************************************************************************/
+
void ev_prefork (void)
{
+ /* nop */
}
void ev_postfork_parent (void)
{
+ /* nop */
}
void ev_postfork_child (void)
{
#if HAVE_EPOLL
- epoll_postfork_child ();
+ 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
}
static void
-timer_reify (void)
+timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)
{
- while (timercnt && timers [0]->at <= ev_now)
+ while (timercnt && timers [0]->at <= now)
{
struct ev_timer *w = timers [0];
- /* first reschedule timer */
+ /* first reschedule or stop timer */
if (w->repeat)
{
- fprintf (stderr, "a %f now %f repeat %f, %f\n", w->at, ev_now, w->repeat, w->repeat *1e30);//D
if (w->is_abs)
- w->at += floor ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
+ w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
else
- w->at = ev_now + w->repeat;
+ w->at = now + w->repeat;
- fprintf (stderr, "b %f\n", w->at);//D
+ assert (w->at > now);
- downheap (0);
+ downheap (timers, timercnt, 0);
}
else
- evtimer_stop (w); /* nonrepeating: stop timer */
+ {
+ evtimer_stop (w); /* nonrepeating: stop timer */
+ --timercnt; /* maybe pass by reference instead? */
+ }
+
+ event ((W)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 ();
+ }
- event ((struct ev_watcher *)w, EV_TIMEOUT);
+ /* 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;
-int ev_loop (int flags)
+void ev_loop (int flags)
{
double block;
ev_loop_done = flags & EVLOOP_ONESHOT;
+ if (checkcnt)
+ {
+ queue_events ((W *)checks, checkcnt, EV_CHECK);
+ call_pending ();
+ }
+
do
{
/* update fd-related kernel structures */
- method_reify (); fdchangecnt = 0;
+ fd_reify ();
/* calculate blocking time */
- ev_now = ev_time ();
-
- if (flags & EVLOOP_NONBLOCK)
+ if (flags & EVLOOP_NONBLOCK || idlecnt)
block = 0.;
- else if (!timercnt)
- block = MAX_BLOCKTIME;
else
{
- block = timers [0]->at - ev_now + method_fudge;
+ 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.;
- else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
}
- fprintf (stderr, "block %f\n", block);//D
method_poll (block);
- /* put pending timers into pendign queue and reschedule them */
- timer_reify ();
+ /* 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 ((W *)idles, idlecnt, EV_IDLE);
+
+ /* queue check and possibly idle watchers */
+ queue_events ((W *)checks, checkcnt, EV_CHECK);
- ev_now = ev_time ();
call_pending ();
}
while (!ev_loop_done);
}
+/*****************************************************************************/
+
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)
{
}
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 */
}
+/*****************************************************************************/
+
void
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, );
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, );
if (ev_is_active (w))
return;
- fprintf (stderr, "t1 %f a %d\n", w->at, w->is_abs);//D
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 += ev_now;
- fprintf (stderr, "t2 %f a %d\n", w->at, w->is_abs);//D
+ {
+ w->at += now;
+
+ ev_start ((W)w, ++rtimercnt);
+ array_needsize (rtimers, rtimermax, rtimercnt, );
+ rtimers [rtimercnt - 1] = w;
+ upheap (rtimers, rtimercnt - 1);
+ }
- ev_start ((struct ev_watcher *)w, ++timercnt);
- array_needsize (timers, timermax, timercnt, );
- timers [timercnt - 1] = w;
- upheap (timercnt - 1);
}
void
if (!ev_is_active (w))
return;
- timers [w->active - 1] = timers [--timercnt];
- downheap (w->active - 1);
- ev_stop ((struct ev_watcher *)w);
+ 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 ((W)w);
}
void
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], (struct ev_watcher_list *)w);
+ wlist_add ((WL *)&signals [w->signum - 1].head, (WL)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
if (!ev_is_active (w))
return;
- wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (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);
+}
+
+void evidle_start (struct ev_idle *w)
+{
+ if (ev_is_active (w))
+ return;
+
+ ev_start ((W)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 ((W)w);
+}
+
+void evcheck_start (struct ev_check *w)
+{
+ if (ev_is_active (w))
+ return;
+
+ ev_start ((W)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 ((W)w);
}
/*****************************************************************************/
-#if 1
+
+#if 0
static void
sin_cb (struct ev_io *w, int 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);
+ //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)
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, 1);
- evtimer_set_rel (&t1, 1, 0);
+ evw_init (&t1, ocb, 0);
+ evtimer_set_abs (&t1, 5, 10);
evtimer_start (&t1);
- struct ev_timer t2;
- evw_init (&t2, ocb, 2);
- evtimer_set_abs (&t2, ev_time () + 2, 0);
- evtimer_start (&t2);
+ 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);
projects / software / libev.git / blobdiff