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master
Marc Alexander Lehmann 2007-12-07 16:44:10 +00:00
parent 67ffe0b273
commit 9d22d620d3
6 changed files with 136 additions and 53 deletions
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109
ev.c
View File

@ -243,9 +243,9 @@ extern "C" {
#define expect_true(expr) expect ((expr) != 0, 1)
#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
#define ABSPRI(w) ((w)->priority - EV_MINPRI)
#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
#define EMPTY /* required for microsofts broken pseudo-c compiler */
#define EMPTY2(a,b) /* used to suppress some warnings */
typedef ev_watcher *W;
@ -788,9 +788,9 @@ child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
if (w->pid == pid || !w->pid)
{
ev_priority (w) = ev_priority (sw); /* need to do it *now* */
w->rpid = pid;
w->rstatus = status;
ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
w->rpid = pid;
w->rstatus = status;
ev_feed_event (EV_A_ (W)w, EV_CHILD);
}
}
@ -1005,17 +1005,21 @@ loop_destroy (EV_P)
#endif
for (i = NUMPRI; i--; )
array_free (pending, [i]);
{
array_free (pending, [i]);
#if EV_IDLE_ENABLE
array_free (idle, [i]);
#endif
}
/* have to use the microsoft-never-gets-it-right macro */
array_free (fdchange, EMPTY0);
array_free (timer, EMPTY0);
array_free (fdchange, EMPTY);
array_free (timer, EMPTY);
#if EV_PERIODIC_ENABLE
array_free (periodic, EMPTY0);
array_free (periodic, EMPTY);
#endif
array_free (idle, EMPTY0);
array_free (prepare, EMPTY0);
array_free (check, EMPTY0);
array_free (prepare, EMPTY);
array_free (check, EMPTY);
backend = 0;
}
@ -1161,18 +1165,6 @@ ev_default_fork (void)
/*****************************************************************************/
int inline_size
any_pending (EV_P)
{
int pri;
for (pri = NUMPRI; pri--; )
if (pendingcnt [pri])
return 1;
return 0;
}
void inline_speed
call_pending (EV_P)
{
@ -1272,6 +1264,29 @@ periodics_reschedule (EV_P)
}
#endif
#if EV_IDLE_ENABLE
void inline_size
idle_reify (EV_P)
{
if (expect_false (!idleall))
{
int pri;
for (pri = NUMPRI; pri--; )
{
if (pendingcnt [pri])
break;
if (idlecnt [pri])
{
queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
break;
}
}
}
}
#endif
int inline_size
time_update_monotonic (EV_P)
{
@ -1414,7 +1429,7 @@ ev_loop (EV_P_ int flags)
{
ev_tstamp block;
if (expect_false (flags & EVLOOP_NONBLOCK || idlecnt || !activecnt))
if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
block = 0.; /* do not block at all */
else
{
@ -1461,9 +1476,10 @@ ev_loop (EV_P_ int flags)
periodics_reify (EV_A); /* absolute timers called first */
#endif
#if EV_IDLE_ENABLE
/* queue idle watchers unless other events are pending */
if (idlecnt && !any_pending (EV_A))
queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
idle_reify (EV_A);
#endif
/* queue check watchers, to be executed first */
if (expect_false (checkcnt))
@ -1518,12 +1534,19 @@ ev_clear_pending (EV_P_ W w)
}
}
void inline_size
pri_adjust (EV_P_ W w)
{
int pri = w->priority;
pri = pri < EV_MINPRI ? EV_MINPRI : pri;
pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
w->priority = pri;
}
void inline_speed
ev_start (EV_P_ W w, int active)
{
if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
pri_adjust (EV_A_ w);
w->active = active;
ev_ref (EV_A);
}
@ -2008,15 +2031,24 @@ ev_stat_stop (EV_P_ ev_stat *w)
}
#endif
#if EV_IDLE_ENABLE
void
ev_idle_start (EV_P_ ev_idle *w)
{
if (expect_false (ev_is_active (w)))
return;
ev_start (EV_A_ (W)w, ++idlecnt);
array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
idles [idlecnt - 1] = w;
pri_adjust (EV_A_ (W)w);
{
int active = ++idlecnt [ABSPRI (w)];
++idleall;
ev_start (EV_A_ (W)w, active);
array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
idles [ABSPRI (w)][active - 1] = w;
}
}
void
@ -2028,12 +2060,15 @@ ev_idle_stop (EV_P_ ev_idle *w)
{
int active = ((W)w)->active;
idles [active - 1] = idles [--idlecnt];
((W)idles [active - 1])->active = active;
}
ev_stop (EV_A_ (W)w);
idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
((W)idles [ABSPRI (w)][active - 1])->active = active;
ev_stop (EV_A_ (W)w);
--idleall;
}
}
#endif
void
ev_prepare_start (EV_P_ ev_prepare *w)

18
ev.h
View File

@ -56,6 +56,10 @@ typedef double ev_tstamp;
# define EV_STAT_ENABLE 1
#endif
#ifndef EV_IDLE_ENABLE
# define EV_IDLE_ENABLE 1
#endif
#ifndef EV_FORK_ENABLE
# define EV_FORK_ENABLE 1
#endif
@ -240,12 +244,14 @@ typedef struct ev_stat
} ev_stat;
#endif
#if EV_IDLE_ENABLE
/* invoked when the nothing else needs to be done, keeps the process from blocking */
/* revent EV_IDLE */
typedef struct ev_idle
{
EV_WATCHER (ev_idle)
} ev_idle;
#endif
/* invoked for each run of the mainloop, just before the blocking call */
/* you can still change events in any way you like */
@ -296,7 +302,9 @@ union ev_any_watcher
#if EV_STAT_ENABLE
struct ev_stat stat;
#endif
#if EV_IDLE_ENABLE
struct ev_idle idle;
#endif
struct ev_prepare prepare;
struct ev_check check;
#if EV_FORK_ENABLE
@ -416,11 +424,11 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
/* these may evaluate ev multiple times, and the other arguments at most once */
/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
#define ev_init(ev,cb_) do { \
#define ev_init(ev,cb_) do { \
((ev_watcher *)(void *)(ev))->active = \
((ev_watcher *)(void *)(ev))->pending = \
((ev_watcher *)(void *)(ev))->priority = 0; \
ev_set_cb ((ev), cb_); \
ev_set_cb ((ev), cb_); \
} while (0)
#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
@ -450,9 +458,9 @@ void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revent
#define ev_is_pending(ev) (0 + ((ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
#define ev_is_active(ev) (0 + ((ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */
#define ev_priority(ev) ((ev_watcher *)(void *)(ev))->priority /* rw */
#define ev_priority(ev) ((((ev_watcher *)(void *)(ev))->priority) + 0)
#define ev_cb(ev) (ev)->cb /* rw */
#define ev_set_priority(ev,pri) ev_priority (ev) = (pri)
#define ev_set_priority(ev,pri) ((ev_watcher *)(void *)(ev))->priority = (pri)
#ifndef ev_set_cb
# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
@ -496,8 +504,10 @@ void ev_stat_stop (EV_P_ ev_stat *w);
void ev_stat_stat (EV_P_ ev_stat *w);
# endif
# if EV_IDLE_ENABLE
void ev_idle_start (EV_P_ ev_idle *w);
void ev_idle_stop (EV_P_ ev_idle *w);
# endif
void ev_prepare_start (EV_P_ ev_prepare *w);
void ev_prepare_stop (EV_P_ ev_prepare *w);

48
ev.pod
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@ -746,6 +746,31 @@ Returns the callback currently set on the watcher.
Change the callback. You can change the callback at virtually any time
(modulo threads).
=item ev_set_priority (ev_TYPE *watcher, priority)
=item int ev_priority (ev_TYPE *watcher)
Set and query the priority of the watcher. The priority is a small
integer between C<EV_MAXPRI> (default: C<2>) and C<EV_MINPRI>
(default: C<-2>). Pending watchers with higher priority will be invoked
before watchers with lower priority, but priority will not keep watchers
from being executed (except for C<ev_idle> watchers).
This means that priorities are I<only> used for ordering callback
invocation after new events have been received. This is useful, for
example, to reduce latency after idling, or more often, to bind two
watchers on the same event and make sure one is called first.
If you need to suppress invocation when higher priority events are pending
you need to look at C<ev_idle> watchers, which provide this functionality.
The default priority used by watchers when no priority has been set is
always C<0>, which is supposed to not be too high and not be too low :).
Setting a priority outside the range of C<EV_MINPRI> to C<EV_MAXPRI> is
fine, as long as you do not mind that the priority value you query might
or might not have been adjusted to be within valid range.
=back
@ -1353,13 +1378,16 @@ Example: Watch C</etc/passwd> for attribute changes.
=head2 C<ev_idle> - when you've got nothing better to do...
Idle watchers trigger events when there are no other events are pending
(prepare, check and other idle watchers do not count). That is, as long
as your process is busy handling sockets or timeouts (or even signals,
imagine) it will not be triggered. But when your process is idle all idle
watchers are being called again and again, once per event loop iteration -
until stopped, that is, or your process receives more events and becomes
busy.
Idle watchers trigger events when no other events of the same or higher
priority are pending (prepare, check and other idle watchers do not
count).
That is, as long as your process is busy handling sockets or timeouts
(or even signals, imagine) of the same or higher priority it will not be
triggered. But when your process is idle (or only lower-priority watchers
are pending), the idle watchers are being called once per event loop
iteration - until stopped, that is, or your process receives more events
and becomes busy again with higher priority stuff.
The most noteworthy effect is that as long as any idle watchers are
active, the process will not block when waiting for new events.
@ -2103,6 +2131,12 @@ If undefined or defined to be C<1>, then periodic timers are supported. If
defined to be C<0>, then they are not. Disabling them saves a few kB of
code.
=item EV_IDLE_ENABLE
If undefined or defined to be C<1>, then idle watchers are supported. If
defined to be C<0>, then they are not. Disabling them saves a few kB of
code.
=item EV_EMBED_ENABLE
If undefined or defined to be C<1>, then embed watchers are supported. If

9
ev_vars.h
View File

@ -73,9 +73,12 @@ VARx(int, periodicmax)
VARx(int, periodiccnt)
#endif
VARx(struct ev_idle **, idles)
VARx(int, idlemax)
VARx(int, idlecnt)
#if EV_IDLE_ENABLE || EV_GENWRAP
VAR (idles, ev_idle **idles [NUMPRI])
VAR (idlemax, int idlemax [NUMPRI])
VAR (idlecnt, int idlecnt [NUMPRI])
#endif
VARx(int, idleall) /* total number */
VARx(struct ev_prepare **, prepares)
VARx(int, preparemax)

1
ev_wrap.h
View File

@ -47,6 +47,7 @@
#define idles ((loop)->idles)
#define idlemax ((loop)->idlemax)
#define idlecnt ((loop)->idlecnt)
#define idleall ((loop)->idleall)
#define prepares ((loop)->prepares)
#define preparemax ((loop)->preparemax)
#define preparecnt ((loop)->preparecnt)

4
import_libevent
View File

@ -81,8 +81,8 @@ perl -ne '
s/\bevent-internal.h\b//g;
s/\bevsignal.h\b//g;
s/^(man_MANS\s*=)/$1 ev.3 /;
s/^(EXTRA_DIST\s*=)/$1 libev.m4 ev.h ev_vars.h ev_wrap.h event_compat.h ev_epoll.c ev_select.c ev_poll.c ev_kqueue.c ev_port.c ev_win32.c ev.3 ev.pod ev.html /;
s/^(include_HEADERS\s*=)/$1 ev.h event_compat.h /;
s/^(EXTRA_DIST\s*=)/$1 libev.m4 ev.h ev_vars.h ev_wrap.h event_compat.h ev++.h ev_epoll.c ev_select.c ev_poll.c ev_kqueue.c ev_port.c ev_win32.c ev.3 ev.pod ev.html /;
s/^(include_HEADERS\s*=)/$1 ev.h event_compat.h ev++.h /;
s/^(CORE_SRC\s*=)/$1 ev.c /;
s/^(SYS_LIBS\s*=)/$1 -lm /;
s/libevent/libev/g;