/*
+ * libev event processing core, watcher management
+ *
* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
* All rights reserved.
*
#include <sys/time.h>
#include <time.h>
+/**/
+
#ifndef EV_USE_MONOTONIC
-# ifdef CLOCK_MONOTONIC
-# define EV_USE_MONOTONIC 1
-# endif
+# define EV_USE_MONOTONIC 1
#endif
#ifndef EV_USE_SELECT
# define EV_USE_SELECT 1
#endif
+#ifndef EV_USE_POLL
+# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
+#endif
+
#ifndef EV_USE_EPOLL
# define EV_USE_EPOLL 0
#endif
#ifndef EV_USE_REALTIME
-# define EV_USE_REALTIME 1 /* posix requirement, but might be slower */
+# define EV_USE_REALTIME 1
+#endif
+
+/**/
+
+#ifndef CLOCK_MONOTONIC
+# undef EV_USE_MONOTONIC
+# define EV_USE_MONOTONIC 0
+#endif
+
+#ifndef CLOCK_REALTIME
+# undef EV_USE_REALTIME
+# define EV_USE_REALTIME 0
#endif
+/**/
+
#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
-#define MAX_BLOCKTIME 59.731
-#define PID_HASHSIZE 16 /* size of pid hahs table, must be power of two */
+#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
+#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
+/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
#include "ev.h"
+#if __GNUC__ >= 3
+# define expect(expr,value) __builtin_expect ((expr),(value))
+# define inline inline
+#else
+# define expect(expr,value) (expr)
+# define inline static
+#endif
+
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr) expect ((expr) != 0, 1)
+
+#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
+#define ABSPRI(w) ((w)->priority - EV_MINPRI)
+
typedef struct ev_watcher *W;
typedef struct ev_watcher_list *WL;
typedef struct ev_watcher_time *WT;
-static ev_tstamp now, diff; /* monotonic clock */
+static ev_tstamp now_floor, now, diff; /* monotonic clock */
ev_tstamp ev_now;
int ev_method;
get_clock (void)
{
#if EV_USE_MONOTONIC
- if (have_monotonic)
+ if (expect_true (have_monotonic))
{
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
#define array_roundsize(base,n) ((n) | 4 & ~3)
#define array_needsize(base,cur,cnt,init) \
- if ((cnt) > cur) \
+ if (expect_false ((cnt) > cur)) \
{ \
int newcnt = cur; \
do \
typedef struct
{
struct ev_io *head;
- int events;
+ unsigned char events;
+ unsigned char reify;
} ANFD;
static ANFD *anfds;
{
base->head = 0;
base->events = EV_NONE;
+ base->reify = 0;
+
++base;
}
}
int events;
} ANPENDING;
-static ANPENDING *pendings;
-static int pendingmax, pendingcnt;
+static ANPENDING *pendings [NUMPRI];
+static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
static void
event (W w, int events)
{
- w->pending = ++pendingcnt;
- array_needsize (pendings, pendingmax, pendingcnt, );
- pendings [pendingcnt - 1].w = w;
- pendings [pendingcnt - 1].events = events;
+ if (w->pending)
+ {
+ pendings [ABSPRI (w)][w->pending - 1].events |= events;
+ return;
+ }
+
+ w->pending = ++pendingcnt [ABSPRI (w)];
+ array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
+ pendings [ABSPRI (w)][w->pending - 1].w = w;
+ pendings [ABSPRI (w)][w->pending - 1].events = events;
}
static void
for (w = anfd->head; w; w = w->next)
events |= w->events;
- anfd->events &= ~EV_REIFY;
+ anfd->reify = 0;
if (anfd->events != events)
{
static void
fd_change (int fd)
{
- if (anfds [fd].events & EV_REIFY || fdchangecnt < 0)
+ if (anfds [fd].reify || fdchangecnt < 0)
return;
- anfds [fd].events |= EV_REIFY;
+ anfds [fd].reify = 1;
++fdchangecnt;
array_needsize (fdchanges, fdchangemax, fdchangecnt, );
fdchanges [fdchangecnt - 1] = fd;
}
+static void
+fd_kill (int fd)
+{
+ struct ev_io *w;
+
+ printf ("killing fd %d\n", fd);//D
+ while ((w = anfds [fd].head))
+ {
+ ev_io_stop (w);
+ event ((W)w, EV_ERROR | EV_READ | EV_WRITE);
+ }
+}
+
/* called on EBADF to verify fds */
static void
-fd_recheck (void)
+fd_ebadf (void)
{
int fd;
for (fd = 0; fd < anfdmax; ++fd)
if (anfds [fd].events)
if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
- while (anfds [fd].head)
- {
- event ((W)anfds [fd].head, EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT);
- ev_io_stop (anfds [fd].head);
- }
+ fd_kill (fd);
+}
+
+/* called on ENOMEM in select/poll to kill some fds and retry */
+static void
+fd_enomem (void)
+{
+ int fd = anfdmax;
+
+ while (fd--)
+ if (anfds [fd].events)
+ {
+ close (fd);
+ fd_kill (fd);
+ return;
+ }
}
/*****************************************************************************/
typedef struct
{
struct ev_signal *head;
- sig_atomic_t gotsig;
+ sig_atomic_t volatile gotsig;
} ANSIG;
static ANSIG *signals;
static int signalmax;
static int sigpipe [2];
-static sig_atomic_t gotsig;
+static sig_atomic_t volatile gotsig;
static struct ev_io sigev;
static void
{
base->head = 0;
base->gotsig = 0;
+
++base;
}
}
if (!gotsig)
{
gotsig = 1;
- write (sigpipe [1], &gotsig, 1);
+ write (sigpipe [1], &signum, 1);
}
}
sigcb (struct ev_io *iow, int revents)
{
struct ev_signal *w;
- int sig;
+ int signum;
- gotsig = 0;
read (sigpipe [0], &revents, 1);
+ gotsig = 0;
- for (sig = signalmax; sig--; )
- if (signals [sig].gotsig)
+ for (signum = signalmax; signum--; )
+ if (signals [signum].gotsig)
{
- signals [sig].gotsig = 0;
+ signals [signum].gotsig = 0;
- for (w = signals [sig].head; w; w = w->next)
+ for (w = signals [signum].head; w; w = w->next)
event ((W)w, EV_SIGNAL);
}
}
while ((pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)) != -1)
for (w = childs [pid & (PID_HASHSIZE - 1)]; w; w = w->next)
- if (w->pid == pid || w->pid == -1)
+ if (w->pid == pid || !w->pid)
{
w->status = status;
event ((W)w, EV_CHILD);
#if EV_USE_EPOLL
# include "ev_epoll.c"
#endif
+#if EV_USE_POLL
+# include "ev_poll.c"
+#endif
#if EV_USE_SELECT
# include "ev_select.c"
#endif
return EV_VERSION_MINOR;
}
-int ev_init (int flags)
+/* return true if we are running with elevated privileges and ignore env variables */
+static int
+enable_secure ()
+{
+ return getuid () != geteuid ()
+ || getgid () != getegid ();
+}
+
+int ev_init (int methods)
{
if (!ev_method)
{
}
#endif
- ev_now = ev_time ();
- now = get_clock ();
- diff = ev_now - now;
+ ev_now = ev_time ();
+ now = get_clock ();
+ now_floor = now;
+ diff = ev_now - now;
if (pipe (sigpipe))
return 0;
- ev_method = EVMETHOD_NONE;
+ if (methods == EVMETHOD_AUTO)
+ if (!enable_secure () && getenv ("LIBEV_METHODS"))
+ methods = atoi (getenv ("LIBEV_METHODS"));
+ else
+ methods = EVMETHOD_ANY;
+
+ ev_method = 0;
#if EV_USE_EPOLL
- if (ev_method == EVMETHOD_NONE) epoll_init (flags);
+ if (!ev_method && (methods & EVMETHOD_EPOLL )) epoll_init (methods);
+#endif
+#if EV_USE_POLL
+ if (!ev_method && (methods & EVMETHOD_POLL )) poll_init (methods);
#endif
#if EV_USE_SELECT
- if (ev_method == EVMETHOD_NONE) select_init (flags);
+ if (!ev_method && (methods & EVMETHOD_SELECT)) select_init (methods);
#endif
if (ev_method)
/*****************************************************************************/
void
-ev_prefork (void)
+ev_fork_prepare (void)
{
/* nop */
}
void
-ev_postfork_parent (void)
+ev_fork_parent (void)
{
/* nop */
}
void
-ev_postfork_child (void)
+ev_fork_child (void)
{
#if EV_USE_EPOLL
if (ev_method == EVMETHOD_EPOLL)
static void
call_pending (void)
{
- while (pendingcnt)
- {
- ANPENDING *p = pendings + --pendingcnt;
+ int pri;
- if (p->w)
- {
- p->w->pending = 0;
- p->w->cb (p->w, p->events);
- }
- }
+ for (pri = NUMPRI; pri--; )
+ while (pendingcnt [pri])
+ {
+ ANPENDING *p = pendings [pri] + --pendingcnt [pri];
+
+ if (p->w)
+ {
+ p->w->pending = 0;
+ p->w->cb (p->w, p->events);
+ }
+ }
}
static void
/* first reschedule or stop timer */
if (w->repeat)
{
+ assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
w->at = now + w->repeat;
- assert (("timer timeout in the past, negative repeat?", w->at > now));
downheap ((WT *)timers, timercnt, 0);
}
else
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));
+ assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > ev_now));
downheap ((WT *)periodics, periodiccnt, 0);
}
else
ev_periodic_stop (w); /* nonrepeating: stop timer */
- event ((W)w, EV_TIMEOUT);
+ event ((W)w, EV_PERIODIC);
}
}
}
}
+static int
+time_update_monotonic (void)
+{
+ now = get_clock ();
+
+ if (expect_true (now - now_floor < MIN_TIMEJUMP * .5))
+ {
+ ev_now = now + diff;
+ return 0;
+ }
+ else
+ {
+ now_floor = now;
+ ev_now = ev_time ();
+ return 1;
+ }
+}
+
static void
time_update (void)
{
int i;
- ev_now = ev_time ();
-
- if (have_monotonic)
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
{
- ev_tstamp odiff = diff;
-
- for (i = 4; --i; ) /* loop a few times, before making important decisions */
+ if (time_update_monotonic ())
{
- now = get_clock ();
- diff = ev_now - now;
+ ev_tstamp odiff = diff;
+
+ for (i = 4; --i; ) /* loop a few times, before making important decisions */
+ {
+ diff = ev_now - now;
- if (fabs (odiff - diff) < MIN_TIMEJUMP)
- return; /* all is well */
+ if (fabs (odiff - diff) < MIN_TIMEJUMP)
+ return; /* all is well */
- ev_now = ev_time ();
- }
+ ev_now = ev_time ();
+ now = get_clock ();
+ now_floor = now;
+ }
- periodics_reschedule (diff - odiff);
- /* no timer adjustment, as the monotonic clock doesn't jump */
+ periodics_reschedule (diff - odiff);
+ /* no timer adjustment, as the monotonic clock doesn't jump */
+ }
}
else
+#endif
{
- if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
+ ev_now = ev_time ();
+
+ if (expect_false (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
{
periodics_reschedule (ev_now - now);
do
{
/* queue check watchers (and execute them) */
- if (preparecnt)
+ if (expect_false (preparecnt))
{
queue_events ((W *)prepares, preparecnt, EV_PREPARE);
call_pending ();
/* we only need this for !monotonic clockor timers, but as we basically
always have timers, we just calculate it always */
- ev_now = ev_time ();
+#if EV_USE_MONOTONIC
+ if (expect_true (have_monotonic))
+ time_update_monotonic ();
+ else
+#endif
+ {
+ ev_now = ev_time ();
+ now = ev_now;
+ }
if (flags & EVLOOP_NONBLOCK || idlecnt)
block = 0.;
if (timercnt)
{
- ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;
+ ev_tstamp to = timers [0]->at - now + method_fudge;
if (block > to) block = to;
}
}
static void
-ev_clear (W w)
+ev_clear_pending (W w)
{
if (w->pending)
{
- pendings [w->pending - 1].w = 0;
+ pendings [ABSPRI (w)][w->pending - 1].w = 0;
w->pending = 0;
}
}
static void
ev_start (W w, int active)
{
+ if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
+ if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
+
w->active = active;
}
void
ev_io_start (struct ev_io *w)
{
+ int fd = w->fd;
+
if (ev_is_active (w))
return;
- int fd = w->fd;
+ assert (("ev_io_start called with negative fd", fd >= 0));
ev_start ((W)w, 1);
array_needsize (anfds, anfdmax, fd + 1, anfds_init);
void
ev_io_stop (struct ev_io *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (!ev_is_active (w))
return;
w->at += now;
- assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));
+ assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
ev_start ((W)w, ++timercnt);
array_needsize (timers, timermax, timercnt, );
void
ev_timer_stop (struct ev_timer *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (!ev_is_active (w))
return;
if (ev_is_active (w))
return;
- assert (("periodic interval value less than zero not allowed", w->interval >= 0.));
+ assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
/* this formula differs from the one in periodic_reify because we do not always round up */
if (w->interval)
void
ev_periodic_stop (struct ev_periodic *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (!ev_is_active (w))
return;
if (ev_is_active (w))
return;
+ assert (("ev_signal_start called with illegal signal number", w->signum > 0));
+
ev_start ((W)w, 1);
array_needsize (signals, signalmax, w->signum, signals_init);
wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
void
ev_signal_stop (struct ev_signal *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (!ev_is_active (w))
return;
void
ev_idle_stop (struct ev_idle *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (ev_is_active (w))
return;
void
ev_prepare_stop (struct ev_prepare *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (ev_is_active (w))
return;
void
ev_check_stop (struct ev_check *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (ev_is_active (w))
return;
void
ev_child_stop (struct ev_child *w)
{
- ev_clear ((W)w);
+ ev_clear_pending ((W)w);
if (ev_is_active (w))
return;
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