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17 | }); |
17 | }); |
18 | |
18 | |
19 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
19 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
20 | $w->send; # wake up current and all future recv's |
20 | $w->send; # wake up current and all future recv's |
21 | $w->recv; # enters "main loop" till $condvar gets ->send |
21 | $w->recv; # enters "main loop" till $condvar gets ->send |
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22 | |
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23 | =head1 INTRODUCTION/TUTORIAL |
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24 | |
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25 | This manpage is mainly a reference manual. If you are interested |
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26 | in a tutorial or some gentle introduction, have a look at the |
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27 | L<AnyEvent::Intro> manpage. |
22 | |
28 | |
23 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
29 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
24 | |
30 | |
25 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
31 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
26 | nowadays. So what is different about AnyEvent? |
32 | nowadays. So what is different about AnyEvent? |
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233 | timers. |
239 | timers. |
234 | |
240 | |
235 | AnyEvent always prefers relative timers, if available, matching the |
241 | AnyEvent always prefers relative timers, if available, matching the |
236 | AnyEvent API. |
242 | AnyEvent API. |
237 | |
243 | |
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244 | AnyEvent has two additional methods that return the "current time": |
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245 | |
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246 | =over 4 |
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247 | |
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248 | =item AnyEvent->time |
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249 | |
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250 | This returns the "current wallclock time" as a fractional number of |
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251 | seconds since the Epoch (the same thing as C<time> or C<Time::HiRes::time> |
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252 | return, and the result is guaranteed to be compatible with those). |
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253 | |
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254 | It progresses independently of any event loop processing, i.e. each call |
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255 | will check the system clock, which usually gets updated frequently. |
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256 | |
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257 | =item AnyEvent->now |
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258 | |
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259 | This also returns the "current wallclock time", but unlike C<time>, above, |
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260 | this value might change only once per event loop iteration, depending on |
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261 | the event loop (most return the same time as C<time>, above). This is the |
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262 | time that AnyEvent's timers get scheduled against. |
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263 | |
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264 | I<In almost all cases (in all cases if you don't care), this is the |
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265 | function to call when you want to know the current time.> |
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266 | |
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267 | This function is also often faster then C<< AnyEvent->time >>, and |
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268 | thus the preferred method if you want some timestamp (for example, |
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269 | L<AnyEvent::Handle> uses this to update it's activity timeouts). |
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270 | |
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271 | The rest of this section is only of relevance if you try to be very exact |
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272 | with your timing, you can skip it without bad conscience. |
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273 | |
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274 | For a practical example of when these times differ, consider L<Event::Lib> |
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275 | and L<EV> and the following set-up: |
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276 | |
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277 | The event loop is running and has just invoked one of your callback at |
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278 | time=500 (assume no other callbacks delay processing). In your callback, |
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279 | you wait a second by executing C<sleep 1> (blocking the process for a |
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280 | second) and then (at time=501) you create a relative timer that fires |
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281 | after three seconds. |
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282 | |
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283 | With L<Event::Lib>, C<< AnyEvent->time >> and C<< AnyEvent->now >> will |
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284 | both return C<501>, because that is the current time, and the timer will |
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285 | be scheduled to fire at time=504 (C<501> + C<3>). |
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286 | |
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287 | With L<EV>, C<< AnyEvent->time >> returns C<501> (as that is the current |
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288 | time), but C<< AnyEvent->now >> returns C<500>, as that is the time the |
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289 | last event processing phase started. With L<EV>, your timer gets scheduled |
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290 | to run at time=503 (C<500> + C<3>). |
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291 | |
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292 | In one sense, L<Event::Lib> is more exact, as it uses the current time |
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293 | regardless of any delays introduced by event processing. However, most |
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294 | callbacks do not expect large delays in processing, so this causes a |
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295 | higher drift (and a lot more system calls to get the current time). |
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296 | |
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297 | In another sense, L<EV> is more exact, as your timer will be scheduled at |
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298 | the same time, regardless of how long event processing actually took. |
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299 | |
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300 | In either case, if you care (and in most cases, you don't), then you |
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301 | can get whatever behaviour you want with any event loop, by taking the |
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302 | difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into |
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303 | account. |
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304 | |
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305 | =back |
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306 | |
238 | =head2 SIGNAL WATCHERS |
307 | =head2 SIGNAL WATCHERS |
239 | |
308 | |
240 | You can watch for signals using a signal watcher, C<signal> is the signal |
309 | You can watch for signals using a signal watcher, C<signal> is the signal |
241 | I<name> without any C<SIG> prefix, C<cb> is the Perl callback to |
310 | I<name> without any C<SIG> prefix, C<cb> is the Perl callback to |
242 | be invoked whenever a signal occurs. |
311 | be invoked whenever a signal occurs. |
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528 | |
597 | |
529 | This is a mutator function that returns the callback set and optionally |
598 | This is a mutator function that returns the callback set and optionally |
530 | replaces it before doing so. |
599 | replaces it before doing so. |
531 | |
600 | |
532 | The callback will be called when the condition becomes "true", i.e. when |
601 | The callback will be called when the condition becomes "true", i.e. when |
533 | C<send> or C<croak> are called. Calling C<recv> inside the callback |
602 | C<send> or C<croak> are called, with the only argument being the condition |
534 | or at any later time is guaranteed not to block. |
603 | variable itself. Calling C<recv> inside the callback or at any later time |
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604 | is guaranteed not to block. |
535 | |
605 | |
536 | =back |
606 | =back |
537 | |
607 | |
538 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
608 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
539 | |
609 | |
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737 | no warnings; |
807 | no warnings; |
738 | use strict; |
808 | use strict; |
739 | |
809 | |
740 | use Carp; |
810 | use Carp; |
741 | |
811 | |
742 | our $VERSION = '4.05'; |
812 | our $VERSION = 4.11; |
743 | our $MODEL; |
813 | our $MODEL; |
744 | |
814 | |
745 | our $AUTOLOAD; |
815 | our $AUTOLOAD; |
746 | our @ISA; |
816 | our @ISA; |
747 | |
817 | |
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779 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
849 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
780 | [Wx:: => AnyEvent::Impl::POE::], |
850 | [Wx:: => AnyEvent::Impl::POE::], |
781 | [Prima:: => AnyEvent::Impl::POE::], |
851 | [Prima:: => AnyEvent::Impl::POE::], |
782 | ); |
852 | ); |
783 | |
853 | |
784 | our %method = map +($_ => 1), qw(io timer signal child condvar one_event DESTROY); |
854 | our %method = map +($_ => 1), qw(io timer time now signal child condvar one_event DESTROY); |
785 | |
855 | |
786 | our @post_detect; |
856 | our @post_detect; |
787 | |
857 | |
788 | sub post_detect(&) { |
858 | sub post_detect(&) { |
789 | my ($cb) = @_; |
859 | my ($cb) = @_; |
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873 | $class->$func (@_); |
943 | $class->$func (@_); |
874 | } |
944 | } |
875 | |
945 | |
876 | package AnyEvent::Base; |
946 | package AnyEvent::Base; |
877 | |
947 | |
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948 | # default implementation for now and time |
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949 | |
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950 | use Time::HiRes (); |
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951 | |
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952 | sub time { Time::HiRes::time } |
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953 | sub now { Time::HiRes::time } |
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954 | |
878 | # default implementation for ->condvar |
955 | # default implementation for ->condvar |
879 | |
956 | |
880 | sub condvar { |
957 | sub condvar { |
881 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
958 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
882 | } |
959 | } |