… | |
… | |
78 | |
78 | |
79 | The interface itself is vaguely similar, but not identical to the L<Event> |
79 | The interface itself is vaguely similar, but not identical to the L<Event> |
80 | module. |
80 | module. |
81 | |
81 | |
82 | During the first call of any watcher-creation method, the module tries |
82 | During the first call of any watcher-creation method, the module tries |
83 | to detect the currently loaded event loop by probing whether one of the |
83 | to detect the currently loaded event loop by probing whether one of |
84 | following modules is already loaded: L<Coro::EV>, L<Coro::Event>, L<EV>, |
84 | the following modules is already loaded: L<Coro::EV>, L<Coro::Event>, |
85 | L<Event>, L<Glib>, L<Tk>. The first one found is used. If none are found, |
85 | L<EV>, L<Event>, L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>. The first one |
86 | the module tries to load these modules in the stated order. The first one |
86 | found is used. If none are found, the module tries to load these modules |
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87 | (excluding Event::Lib and Qt) in the order given. The first one that can |
87 | that can be successfully loaded will be used. If, after this, still none |
88 | be successfully loaded will be used. If, after this, still none could be |
88 | could be found, AnyEvent will fall back to a pure-perl event loop, which |
89 | found, AnyEvent will fall back to a pure-perl event loop, which is not |
89 | is not very efficient, but should work everywhere. |
90 | very efficient, but should work everywhere. |
90 | |
91 | |
91 | Because AnyEvent first checks for modules that are already loaded, loading |
92 | Because AnyEvent first checks for modules that are already loaded, loading |
92 | an event model explicitly before first using AnyEvent will likely make |
93 | an event model explicitly before first using AnyEvent will likely make |
93 | that model the default. For example: |
94 | that model the default. For example: |
94 | |
95 | |
… | |
… | |
206 | |
207 | |
207 | There are two ways to handle timers: based on real time (relative, "fire |
208 | There are two ways to handle timers: based on real time (relative, "fire |
208 | in 10 seconds") and based on wallclock time (absolute, "fire at 12 |
209 | in 10 seconds") and based on wallclock time (absolute, "fire at 12 |
209 | o'clock"). |
210 | o'clock"). |
210 | |
211 | |
211 | While most event loops expect timers to specified in a relative way, they use |
212 | While most event loops expect timers to specified in a relative way, they |
212 | absolute time internally. This makes a difference when your clock "jumps", |
213 | use absolute time internally. This makes a difference when your clock |
213 | for example, when ntp decides to set your clock backwards from the wrong 2014-01-01 to |
214 | "jumps", for example, when ntp decides to set your clock backwards from |
214 | 2008-01-01, a watcher that you created to fire "after" a second might actually take |
215 | the wrong date of 2014-01-01 to 2008-01-01, a watcher that is supposed to |
215 | six years to finally fire. |
216 | fire "after" a second might actually take six years to finally fire. |
216 | |
217 | |
217 | AnyEvent cannot compensate for this. The only event loop that is conscious |
218 | AnyEvent cannot compensate for this. The only event loop that is conscious |
218 | about these issues is L<EV>, which offers both relative (ev_timer) and |
219 | about these issues is L<EV>, which offers both relative (ev_timer, based |
219 | absolute (ev_periodic) timers. |
220 | on true relative time) and absolute (ev_periodic, based on wallclock time) |
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221 | timers. |
220 | |
222 | |
221 | AnyEvent always prefers relative timers, if available, matching the |
223 | AnyEvent always prefers relative timers, if available, matching the |
222 | AnyEvent API. |
224 | AnyEvent API. |
223 | |
225 | |
224 | =head2 SIGNAL WATCHERS |
226 | =head2 SIGNAL WATCHERS |
225 | |
227 | |
226 | You can watch for signals using a signal watcher, C<signal> is the signal |
228 | You can watch for signals using a signal watcher, C<signal> is the signal |
227 | I<name> without any C<SIG> prefix, C<cb> is the Perl callback to |
229 | I<name> without any C<SIG> prefix, C<cb> is the Perl callback to |
228 | be invoked whenever a signal occurs. |
230 | be invoked whenever a signal occurs. |
229 | |
231 | |
230 | Multiple signals occurances can be clumped together into one callback |
232 | Multiple signal occurances can be clumped together into one callback |
231 | invocation, and callback invocation will be synchronous. synchronous means |
233 | invocation, and callback invocation will be synchronous. synchronous means |
232 | that it might take a while until the signal gets handled by the process, |
234 | that it might take a while until the signal gets handled by the process, |
233 | but it is guarenteed not to interrupt any other callbacks. |
235 | but it is guarenteed not to interrupt any other callbacks. |
234 | |
236 | |
235 | The main advantage of using these watchers is that you can share a signal |
237 | The main advantage of using these watchers is that you can share a signal |
… | |
… | |
420 | no warnings; |
422 | no warnings; |
421 | use strict; |
423 | use strict; |
422 | |
424 | |
423 | use Carp; |
425 | use Carp; |
424 | |
426 | |
425 | our $VERSION = '3.12'; |
427 | our $VERSION = '3.2'; |
426 | our $MODEL; |
428 | our $MODEL; |
427 | |
429 | |
428 | our $AUTOLOAD; |
430 | our $AUTOLOAD; |
429 | our @ISA; |
431 | our @ISA; |
430 | |
432 | |
… | |
… | |
455 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
457 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
456 | my $model = "AnyEvent::Impl::$1"; |
458 | my $model = "AnyEvent::Impl::$1"; |
457 | if (eval "require $model") { |
459 | if (eval "require $model") { |
458 | $MODEL = $model; |
460 | $MODEL = $model; |
459 | warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1; |
461 | warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1; |
|
|
462 | } else { |
|
|
463 | warn "AnyEvent: unable to load model '$model' (from \$PERL_ANYEVENT_MODEL):\n$@" if $verbose; |
460 | } |
464 | } |
461 | } |
465 | } |
462 | |
466 | |
463 | # check for already loaded models |
467 | # check for already loaded models |
464 | unless ($MODEL) { |
468 | unless ($MODEL) { |
… | |
… | |
657 | |
661 | |
658 | =over 4 |
662 | =over 4 |
659 | |
663 | |
660 | =item C<PERL_ANYEVENT_VERBOSE> |
664 | =item C<PERL_ANYEVENT_VERBOSE> |
661 | |
665 | |
|
|
666 | By default, AnyEvent will be completely silent except in fatal |
|
|
667 | conditions. You can set this environment variable to make AnyEvent more |
|
|
668 | talkative. |
|
|
669 | |
|
|
670 | When set to C<1> or higher, causes AnyEvent to warn about unexpected |
|
|
671 | conditions, such as not being able to load the event model specified by |
|
|
672 | C<PERL_ANYEVENT_MODEL>. |
|
|
673 | |
662 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
674 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
663 | model it chooses. |
675 | model it chooses. |
664 | |
676 | |
665 | =item C<PERL_ANYEVENT_MODEL> |
677 | =item C<PERL_ANYEVENT_MODEL> |
666 | |
678 | |