… | |
… | |
46 | my ($w, $revents) = @_; |
46 | my ($w, $revents) = @_; |
47 | warn $w->path, " has changed somehow.\n"; |
47 | warn $w->path, " has changed somehow.\n"; |
48 | }; |
48 | }; |
49 | |
49 | |
50 | # MAINLOOP |
50 | # MAINLOOP |
51 | EV::loop; # loop until EV::unloop is called or all watchers stop |
51 | EV::run; # loop until EV::break is called or all watchers stop |
52 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
52 | EV::run EV::RUN_ONCE; # block until at least one event could be handled |
53 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
53 | EV::run EV::RUN_NOWAIT; # try to handle same events, but do not block |
54 | |
54 | |
55 | BEFORE YOU START USING THIS MODULE |
55 | BEFORE YOU START USING THIS MODULE |
56 | If you only need timer, I/O, signal, child and idle watchers and not the |
56 | If you only need timer, I/O, signal, child and idle watchers and not the |
57 | advanced functionality of this module, consider using AnyEvent instead, |
57 | advanced functionality of this module, consider using AnyEvent instead, |
58 | specifically the simplified API described in AE. |
58 | specifically the simplified API described in AE. |
… | |
… | |
151 | Must be called after a fork in the child, before entering or |
151 | Must be called after a fork in the child, before entering or |
152 | continuing the event loop. An alternative is to use |
152 | continuing the event loop. An alternative is to use |
153 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
153 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
154 | some performance loss (refer to the libev documentation). |
154 | some performance loss (refer to the libev documentation). |
155 | |
155 | |
156 | $loop->loop_verify |
156 | $loop->verify |
157 | Calls "ev_verify" to make internal consistency checks (for debugging |
157 | Calls "ev_verify" to make internal consistency checks (for debugging |
158 | libev) and abort the program if any data structures were found to be |
158 | libev) and abort the program if any data structures were found to be |
159 | corrupted. |
159 | corrupted. |
160 | |
160 | |
161 | $loop = EV::default_loop [$flags] |
161 | $loop = EV::default_loop [$flags] |
… | |
… | |
233 | $backend = EV::backend |
233 | $backend = EV::backend |
234 | $backend = $loop->backend |
234 | $backend = $loop->backend |
235 | Returns an integer describing the backend used by libev |
235 | Returns an integer describing the backend used by libev |
236 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
236 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
237 | |
237 | |
238 | EV::loop [$flags] |
238 | $active = EV::run [$flags] |
239 | $loop->loop ([$flags]) |
239 | $active = $loop->run ([$flags]) |
240 | Begin checking for events and calling callbacks. It returns when a |
240 | Begin checking for events and calling callbacks. It returns when a |
241 | callback calls EV::unloop. |
241 | callback calls EV::break or the flasg are nonzero (in which case the |
|
|
242 | return value is true) or when there are no active watchers which |
|
|
243 | reference the loop (keepalive is true), in which case the return |
|
|
244 | value will be false. The returnv alue can generally be interpreted |
|
|
245 | as "if true, there is more work left to do". |
242 | |
246 | |
243 | The $flags argument can be one of the following: |
247 | The $flags argument can be one of the following: |
244 | |
248 | |
245 | 0 as above |
249 | 0 as above |
246 | EV::LOOP_ONCE block at most once (wait, but do not loop) |
250 | EV::RUN_ONCE block at most once (wait, but do not loop) |
247 | EV::LOOP_NOWAIT do not block at all (fetch/handle events but do not wait) |
251 | EV::RUN_NOWAIT do not block at all (fetch/handle events but do not wait) |
248 | |
252 | |
249 | EV::break [$how] |
253 | EV::break [$how] |
250 | $loop->break ([$how]) |
254 | $loop->break ([$how]) |
251 | When called with no arguments or an argument of EV::BREAK_ONE, makes |
255 | When called with no arguments or an argument of EV::BREAK_ONE, makes |
252 | the innermost call to EV::loop return. |
256 | the innermost call to EV::loop return. |
… | |
… | |
255 | will return as fast as possible. |
259 | will return as fast as possible. |
256 | |
260 | |
257 | When called with an argument of EV::BREAK_CANCEL, any pending break |
261 | When called with an argument of EV::BREAK_CANCEL, any pending break |
258 | will be cancelled. |
262 | will be cancelled. |
259 | |
263 | |
260 | $count = EV::loop_count |
264 | $count = EV::iteration |
261 | $count = $loop->loop_count |
265 | $count = $loop->iteration |
262 | Return the number of times the event loop has polled for new events. |
266 | Return the number of times the event loop has polled for new events. |
263 | Sometimes useful as a generation counter. |
267 | Sometimes useful as a generation counter. |
264 | |
268 | |
265 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
269 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
266 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
270 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
… | |
… | |
497 | the same time. |
501 | the same time. |
498 | |
502 | |
499 | The "timer_ns" variant doesn't start (activate) the newly created |
503 | The "timer_ns" variant doesn't start (activate) the newly created |
500 | watcher. |
504 | watcher. |
501 | |
505 | |
502 | $w->set ($after, $repeat) |
506 | $w->set ($after, $repeat = 0) |
503 | Reconfigures the watcher, see the constructor above for details. Can |
507 | Reconfigures the watcher, see the constructor above for details. Can |
504 | be called at any time. |
508 | be called at any time. |
505 | |
509 | |
506 | $w->again |
510 | $w->again |
|
|
511 | $w->again ($repeat) |
507 | Similar to the "start" method, but has special semantics for |
512 | Similar to the "start" method, but has special semantics for |
508 | repeating timers: |
513 | repeating timers: |
509 | |
514 | |
510 | If the timer is active and non-repeating, it will be stopped. |
515 | If the timer is active and non-repeating, it will be stopped. |
511 | |
516 | |
… | |
… | |
519 | |
524 | |
520 | This behaviour is useful when you have a timeout for some IO |
525 | This behaviour is useful when you have a timeout for some IO |
521 | operation. You create a timer object with the same value for $after |
526 | operation. You create a timer object with the same value for $after |
522 | and $repeat, and then, in the read/write watcher, run the "again" |
527 | and $repeat, and then, in the read/write watcher, run the "again" |
523 | method on the timeout. |
528 | method on the timeout. |
|
|
529 | |
|
|
530 | If called with a $repeat argument, then it uses this a timer repeat |
|
|
531 | value. |
|
|
532 | |
|
|
533 | $after = $w->remaining |
|
|
534 | Calculates and returns the remaining time till the timer will fire. |
524 | |
535 | |
525 | PERIODIC WATCHERS - to cron or not to cron? |
536 | PERIODIC WATCHERS - to cron or not to cron? |
526 | $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
537 | $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
527 | $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
538 | $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
528 | $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback) |
539 | $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback) |
… | |
… | |
554 | to system time: |
565 | to system time: |
555 | |
566 | |
556 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
567 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
557 | |
568 | |
558 | That doesn't mean there will always be 3600 seconds in between |
569 | That doesn't mean there will always be 3600 seconds in between |
559 | triggers, but only that the the clalback will be called when the |
570 | triggers, but only that the the callback will be called when the |
560 | system time shows a full hour (UTC). |
571 | system time shows a full hour (UTC). |
561 | |
572 | |
562 | Another way to think about it (for the mathematically inclined) |
573 | Another way to think about it (for the mathematically inclined) |
563 | is that EV::periodic will try to run the callback in this mode |
574 | is that EV::periodic will try to run the callback in this mode |
564 | at the next possible time where "$time = $at (mod $interval)", |
575 | at the next possible time where "$time = $at (mod $interval)", |
… | |
… | |
925 | |
936 | |
926 | Please see the libev documentation for further details. |
937 | Please see the libev documentation for further details. |
927 | |
938 | |
928 | $w = EV::async $callback |
939 | $w = EV::async $callback |
929 | $w = EV::async_ns $callback |
940 | $w = EV::async_ns $callback |
|
|
941 | $w = $loop->async ($callback) |
|
|
942 | $w = $loop->async_ns ($callback) |
930 | $w->send |
943 | $w->send |
931 | $bool = $w->async_pending |
944 | $bool = $w->async_pending |
|
|
945 | |
|
|
946 | CLEANUP WATCHERS - how to clean up when the event loop goes away |
|
|
947 | Cleanup watchers are not supported on the Perl level, they can only be |
|
|
948 | used via XS currently. |
932 | |
949 | |
933 | PERL SIGNALS |
950 | PERL SIGNALS |
934 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
951 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
935 | with EV is as the same as any other C library: Perl-signals will only be |
952 | with EV is as the same as any other C library: Perl-signals will only be |
936 | handled when Perl runs, which means your signal handler might be invoked |
953 | handled when Perl runs, which means your signal handler might be invoked |