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This commit is contained in:
Marc Alexander Lehmann 2007-11-02 11:02:23 +00:00
parent 899c618447
commit fa48af2286
4 changed files with 88 additions and 42 deletions
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120
ev.c
View File

@ -48,15 +48,12 @@
#include <sys/time.h>
#include <time.h>
/**/
#ifndef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 1
#endif
#ifndef CLOCK_MONOTONIC
# undef EV_USE_MONOTONIC
# define EV_USE_MONOTONIC 0
#endif
#ifndef EV_USE_SELECT
# define EV_USE_SELECT 1
#endif
@ -65,25 +62,47 @@
# define EV_USE_EPOLL 0
#endif
#ifndef EV_USE_REALTIME
# 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
#ifndef EV_USE_REALTIME
# define EV_USE_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 59.731 /* never wait longer than this time (to detetc time jumps) */
#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 (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
/*#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)
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;
@ -113,7 +132,7 @@ static ev_tstamp
get_clock (void)
{
#if EV_USE_MONOTONIC
if (have_monotonic)
if (expect_true (have_monotonic))
{
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
@ -127,7 +146,7 @@ get_clock (void)
#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 \
@ -465,9 +484,10 @@ int ev_init (int flags)
}
#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;
@ -606,34 +626,58 @@ periodics_reschedule (ev_tstamp diff)
}
}
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;
if (fabs (odiff - diff) < MIN_TIMEJUMP)
return; /* all is well */
for (i = 4; --i; ) /* loop a few times, before making important decisions */
{
diff = ev_now - now;
ev_now = ev_time ();
if (fabs (odiff - diff) < MIN_TIMEJUMP)
return; /* all is well */
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);
@ -656,7 +700,7 @@ void ev_loop (int flags)
do
{
/* queue check watchers (and execute them) */
if (preparecnt)
if (expect_false (preparecnt))
{
queue_events ((W *)prepares, preparecnt, EV_PREPARE);
call_pending ();
@ -669,7 +713,15 @@ void ev_loop (int flags)
/* 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.;
@ -679,7 +731,7 @@ void ev_loop (int flags)
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;
}

4
ev_epoll.c
View File

@ -81,10 +81,10 @@ epoll_poll (ev_tstamp timeout)
);
/* if the receive array was full, increase its size */
if (eventcnt == eventmax)
if (expect_false (eventcnt == eventmax))
{
free (events);
eventmax += eventmax >> 1;
eventmax = array_roundsize (events, eventmax << 1);
events = malloc (sizeof (struct epoll_event) * eventmax);
}
}

5
event.c
View File

@ -234,11 +234,6 @@ int event_del (struct event *ev)
return 0;
}
void event_active (struct event *ev, int fd, short events)
{
/* unclear what this does, likely internal-use */
}
int event_pending (struct event *ev, short events, struct timeval *tv)
{
short revents;

1
event.h
View File

@ -100,7 +100,6 @@ int event_once (int fd, short events, void (*cb)(int, short, void *), void *arg,
int event_add (struct event *ev, struct timeval *tv);
int event_del (struct event *ev);
void event_active (struct event *ev, int fd, short events);
int event_pending (struct event *ev, short, struct timeval *tv);