1 | =head1 => NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent - provide framework for multiple event loops |
3 | AnyEvent - provide framework for multiple event loops |
4 | |
4 | |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops |
6 | |
6 | |
… | |
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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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48 | isn't itself. What's worse, all the potential users of your module are |
54 | isn't itself. What's worse, all the potential users of your module are |
49 | I<also> forced to use the same event loop you use. |
55 | I<also> forced to use the same event loop you use. |
50 | |
56 | |
51 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
57 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
52 | fine. AnyEvent + Tk works fine etc. etc. but none of these work together |
58 | fine. AnyEvent + Tk works fine etc. etc. but none of these work together |
53 | with the rest: POE + IO::Async? no go. Tk + Event? no go. Again: if |
59 | with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if |
54 | your module uses one of those, every user of your module has to use it, |
60 | your module uses one of those, every user of your module has to use it, |
55 | too. But if your module uses AnyEvent, it works transparently with all |
61 | too. But if your module uses AnyEvent, it works transparently with all |
56 | event models it supports (including stuff like POE and IO::Async, as long |
62 | event models it supports (including stuff like POE and IO::Async, as long |
57 | as those use one of the supported event loops. It is trivial to add new |
63 | as those use one of the supported event loops. It is trivial to add new |
58 | event loops to AnyEvent, too, so it is future-proof). |
64 | event loops to AnyEvent, too, so it is future-proof). |
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62 | modules, you get an enormous amount of code and strict rules you have to |
68 | modules, you get an enormous amount of code and strict rules you have to |
63 | follow. AnyEvent, on the other hand, is lean and up to the point, by only |
69 | follow. AnyEvent, on the other hand, is lean and up to the point, by only |
64 | offering the functionality that is necessary, in as thin as a wrapper as |
70 | offering the functionality that is necessary, in as thin as a wrapper as |
65 | technically possible. |
71 | technically possible. |
66 | |
72 | |
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73 | Of course, AnyEvent comes with a big (and fully optional!) toolbox |
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74 | of useful functionality, such as an asynchronous DNS resolver, 100% |
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75 | non-blocking connects (even with TLS/SSL, IPv6 and on broken platforms |
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76 | such as Windows) and lots of real-world knowledge and workarounds for |
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77 | platform bugs and differences. |
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78 | |
67 | Of course, if you want lots of policy (this can arguably be somewhat |
79 | Now, if you I<do want> lots of policy (this can arguably be somewhat |
68 | useful) and you want to force your users to use the one and only event |
80 | useful) and you want to force your users to use the one and only event |
69 | model, you should I<not> use this module. |
81 | model, you should I<not> use this module. |
70 | |
82 | |
71 | =head1 DESCRIPTION |
83 | =head1 DESCRIPTION |
72 | |
84 | |
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102 | starts using it, all bets are off. Maybe you should tell their authors to |
114 | starts using it, all bets are off. Maybe you should tell their authors to |
103 | use AnyEvent so their modules work together with others seamlessly... |
115 | use AnyEvent so their modules work together with others seamlessly... |
104 | |
116 | |
105 | The pure-perl implementation of AnyEvent is called |
117 | The pure-perl implementation of AnyEvent is called |
106 | C<AnyEvent::Impl::Perl>. Like other event modules you can load it |
118 | C<AnyEvent::Impl::Perl>. Like other event modules you can load it |
107 | explicitly. |
119 | explicitly and enjoy the high availability of that event loop :) |
108 | |
120 | |
109 | =head1 WATCHERS |
121 | =head1 WATCHERS |
110 | |
122 | |
111 | AnyEvent has the central concept of a I<watcher>, which is an object that |
123 | AnyEvent has the central concept of a I<watcher>, which is an object that |
112 | stores relevant data for each kind of event you are waiting for, such as |
124 | stores relevant data for each kind of event you are waiting for, such as |
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126 | Many watchers either are used with "recursion" (repeating timers for |
138 | Many watchers either are used with "recursion" (repeating timers for |
127 | example), or need to refer to their watcher object in other ways. |
139 | example), or need to refer to their watcher object in other ways. |
128 | |
140 | |
129 | An any way to achieve that is this pattern: |
141 | An any way to achieve that is this pattern: |
130 | |
142 | |
131 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
143 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
132 | # you can use $w here, for example to undef it |
144 | # you can use $w here, for example to undef it |
133 | undef $w; |
145 | undef $w; |
134 | }); |
146 | }); |
135 | |
147 | |
136 | Note that C<my $w; $w => combination. This is necessary because in Perl, |
148 | Note that C<my $w; $w => combination. This is necessary because in Perl, |
137 | my variables are only visible after the statement in which they are |
149 | my variables are only visible after the statement in which they are |
138 | declared. |
150 | declared. |
139 | |
151 | |
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227 | timers. |
239 | timers. |
228 | |
240 | |
229 | AnyEvent always prefers relative timers, if available, matching the |
241 | AnyEvent always prefers relative timers, if available, matching the |
230 | AnyEvent API. |
242 | AnyEvent API. |
231 | |
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 | |
232 | =head2 SIGNAL WATCHERS |
307 | =head2 SIGNAL WATCHERS |
233 | |
308 | |
234 | 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 |
235 | 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 |
236 | be invoked whenever a signal occurs. |
311 | be invoked whenever a signal occurs. |
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277 | AnyEvent program, you I<have> to create at least one watcher before you |
352 | AnyEvent program, you I<have> to create at least one watcher before you |
278 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
353 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
279 | |
354 | |
280 | Example: fork a process and wait for it |
355 | Example: fork a process and wait for it |
281 | |
356 | |
282 | my $done = AnyEvent->condvar; |
357 | my $done = AnyEvent->condvar; |
283 | |
358 | |
284 | my $pid = fork or exit 5; |
359 | my $pid = fork or exit 5; |
285 | |
360 | |
286 | my $w = AnyEvent->child ( |
361 | my $w = AnyEvent->child ( |
287 | pid => $pid, |
362 | pid => $pid, |
288 | cb => sub { |
363 | cb => sub { |
289 | my ($pid, $status) = @_; |
364 | my ($pid, $status) = @_; |
290 | warn "pid $pid exited with status $status"; |
365 | warn "pid $pid exited with status $status"; |
291 | $done->send; |
366 | $done->send; |
292 | }, |
367 | }, |
293 | ); |
368 | ); |
294 | |
369 | |
295 | # do something else, then wait for process exit |
370 | # do something else, then wait for process exit |
296 | $done->recv; |
371 | $done->recv; |
297 | |
372 | |
298 | =head2 CONDITION VARIABLES |
373 | =head2 CONDITION VARIABLES |
299 | |
374 | |
300 | If you are familiar with some event loops you will know that all of them |
375 | If you are familiar with some event loops you will know that all of them |
301 | require you to run some blocking "loop", "run" or similar function that |
376 | require you to run some blocking "loop", "run" or similar function that |
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312 | C<cb>, which specifies a callback to be called when the condition variable |
387 | C<cb>, which specifies a callback to be called when the condition variable |
313 | becomes true. |
388 | becomes true. |
314 | |
389 | |
315 | After creation, the condition variable is "false" until it becomes "true" |
390 | After creation, the condition variable is "false" until it becomes "true" |
316 | by calling the C<send> method (or calling the condition variable as if it |
391 | by calling the C<send> method (or calling the condition variable as if it |
317 | were a callback). |
392 | were a callback, read about the caveats in the description for the C<< |
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393 | ->send >> method). |
318 | |
394 | |
319 | Condition variables are similar to callbacks, except that you can |
395 | Condition variables are similar to callbacks, except that you can |
320 | optionally wait for them. They can also be called merge points - points |
396 | optionally wait for them. They can also be called merge points - points |
321 | in time where multiple outstanding events have been processed. And yet |
397 | in time where multiple outstanding events have been processed. And yet |
322 | another way to call them is transactions - each condition variable can be |
398 | another way to call them is transactions - each condition variable can be |
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394 | immediately from within send. |
470 | immediately from within send. |
395 | |
471 | |
396 | Any arguments passed to the C<send> call will be returned by all |
472 | Any arguments passed to the C<send> call will be returned by all |
397 | future C<< ->recv >> calls. |
473 | future C<< ->recv >> calls. |
398 | |
474 | |
399 | Condition variables are overloaded so one can call them directly (as a |
475 | Condition variables are overloaded so one can call them directly |
400 | code reference). Calling them directly is the same as calling C<send>. |
476 | (as a code reference). Calling them directly is the same as calling |
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477 | C<send>. Note, however, that many C-based event loops do not handle |
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478 | overloading, so as tempting as it may be, passing a condition variable |
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479 | instead of a callback does not work. Both the pure perl and EV loops |
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480 | support overloading, however, as well as all functions that use perl to |
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481 | invoke a callback (as in L<AnyEvent::Socket> and L<AnyEvent::DNS> for |
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482 | example). |
401 | |
483 | |
402 | =item $cv->croak ($error) |
484 | =item $cv->croak ($error) |
403 | |
485 | |
404 | Similar to send, but causes all call's to C<< ->recv >> to invoke |
486 | Similar to send, but causes all call's to C<< ->recv >> to invoke |
405 | C<Carp::croak> with the given error message/object/scalar. |
487 | C<Carp::croak> with the given error message/object/scalar. |
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515 | |
597 | |
516 | 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 |
517 | replaces it before doing so. |
599 | replaces it before doing so. |
518 | |
600 | |
519 | 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 |
520 | 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 |
521 | 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. |
522 | |
605 | |
523 | =back |
606 | =back |
524 | |
607 | |
525 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
608 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
526 | |
609 | |
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612 | |
695 | |
613 | If it doesn't care, it can just "use AnyEvent" and use it itself, or not |
696 | If it doesn't care, it can just "use AnyEvent" and use it itself, or not |
614 | do anything special (it does not need to be event-based) and let AnyEvent |
697 | do anything special (it does not need to be event-based) and let AnyEvent |
615 | decide which implementation to chose if some module relies on it. |
698 | decide which implementation to chose if some module relies on it. |
616 | |
699 | |
617 | If the main program relies on a specific event model. For example, in |
700 | If the main program relies on a specific event model - for example, in |
618 | Gtk2 programs you have to rely on the Glib module. You should load the |
701 | Gtk2 programs you have to rely on the Glib module - you should load the |
619 | event module before loading AnyEvent or any module that uses it: generally |
702 | event module before loading AnyEvent or any module that uses it: generally |
620 | speaking, you should load it as early as possible. The reason is that |
703 | speaking, you should load it as early as possible. The reason is that |
621 | modules might create watchers when they are loaded, and AnyEvent will |
704 | modules might create watchers when they are loaded, and AnyEvent will |
622 | decide on the event model to use as soon as it creates watchers, and it |
705 | decide on the event model to use as soon as it creates watchers, and it |
623 | might chose the wrong one unless you load the correct one yourself. |
706 | might chose the wrong one unless you load the correct one yourself. |
624 | |
707 | |
625 | You can chose to use a rather inefficient pure-perl implementation by |
708 | You can chose to use a pure-perl implementation by loading the |
626 | loading the C<AnyEvent::Impl::Perl> module, which gives you similar |
709 | C<AnyEvent::Impl::Perl> module, which gives you similar behaviour |
627 | behaviour everywhere, but letting AnyEvent chose is generally better. |
710 | everywhere, but letting AnyEvent chose the model is generally better. |
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711 | |
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712 | =head2 MAINLOOP EMULATION |
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713 | |
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714 | Sometimes (often for short test scripts, or even standalone programs who |
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715 | only want to use AnyEvent), you do not want to run a specific event loop. |
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716 | |
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717 | In that case, you can use a condition variable like this: |
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718 | |
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719 | AnyEvent->condvar->recv; |
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720 | |
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721 | This has the effect of entering the event loop and looping forever. |
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722 | |
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723 | Note that usually your program has some exit condition, in which case |
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724 | it is better to use the "traditional" approach of storing a condition |
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725 | variable somewhere, waiting for it, and sending it when the program should |
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726 | exit cleanly. |
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727 | |
628 | |
728 | |
629 | =head1 OTHER MODULES |
729 | =head1 OTHER MODULES |
630 | |
730 | |
631 | The following is a non-exhaustive list of additional modules that use |
731 | The following is a non-exhaustive list of additional modules that use |
632 | AnyEvent and can therefore be mixed easily with other AnyEvent modules |
732 | AnyEvent and can therefore be mixed easily with other AnyEvent modules |
… | |
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648 | |
748 | |
649 | Provides various utility functions for (internet protocol) sockets, |
749 | Provides various utility functions for (internet protocol) sockets, |
650 | addresses and name resolution. Also functions to create non-blocking tcp |
750 | addresses and name resolution. Also functions to create non-blocking tcp |
651 | connections or tcp servers, with IPv6 and SRV record support and more. |
751 | connections or tcp servers, with IPv6 and SRV record support and more. |
652 | |
752 | |
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753 | =item L<AnyEvent::DNS> |
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754 | |
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755 | Provides rich asynchronous DNS resolver capabilities. |
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756 | |
653 | =item L<AnyEvent::HTTPD> |
757 | =item L<AnyEvent::HTTPD> |
654 | |
758 | |
655 | Provides a simple web application server framework. |
759 | Provides a simple web application server framework. |
656 | |
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657 | =item L<AnyEvent::DNS> |
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658 | |
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659 | Provides rich asynchronous DNS resolver capabilities. |
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660 | |
760 | |
661 | =item L<AnyEvent::FastPing> |
761 | =item L<AnyEvent::FastPing> |
662 | |
762 | |
663 | The fastest ping in the west. |
763 | The fastest ping in the west. |
664 | |
764 | |
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707 | no warnings; |
807 | no warnings; |
708 | use strict; |
808 | use strict; |
709 | |
809 | |
710 | use Carp; |
810 | use Carp; |
711 | |
811 | |
712 | our $VERSION = '4.03'; |
812 | our $VERSION = 4.12; |
713 | our $MODEL; |
813 | our $MODEL; |
714 | |
814 | |
715 | our $AUTOLOAD; |
815 | our $AUTOLOAD; |
716 | our @ISA; |
816 | our @ISA; |
717 | |
817 | |
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818 | our @REGISTRY; |
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819 | |
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820 | our $WIN32; |
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821 | |
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822 | BEGIN { |
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823 | my $win32 = ! ! ($^O =~ /mswin32/i); |
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824 | eval "sub WIN32(){ $win32 }"; |
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825 | } |
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826 | |
718 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
827 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
719 | |
828 | |
720 | our @REGISTRY; |
829 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
721 | |
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722 | our %PROTOCOL; # (ipv4|ipv6) => (1|2) |
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723 | |
830 | |
724 | { |
831 | { |
725 | my $idx; |
832 | my $idx; |
726 | $PROTOCOL{$_} = ++$idx |
833 | $PROTOCOL{$_} = ++$idx |
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834 | for reverse split /\s*,\s*/, |
727 | for split /\s*,\s*/, $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
835 | $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
728 | } |
836 | } |
729 | |
837 | |
730 | my @models = ( |
838 | my @models = ( |
731 | [EV:: => AnyEvent::Impl::EV::], |
839 | [EV:: => AnyEvent::Impl::EV::], |
732 | [Event:: => AnyEvent::Impl::Event::], |
840 | [Event:: => AnyEvent::Impl::Event::], |
733 | [Tk:: => AnyEvent::Impl::Tk::], |
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734 | [Wx:: => AnyEvent::Impl::POE::], |
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735 | [Prima:: => AnyEvent::Impl::POE::], |
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736 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
841 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
737 | # everything below here will not be autoprobed as the pureperl backend should work everywhere |
842 | # everything below here will not be autoprobed |
738 | [Glib:: => AnyEvent::Impl::Glib::], |
843 | # as the pureperl backend should work everywhere |
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844 | # and is usually faster |
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845 | [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles |
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846 | [Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers |
739 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
847 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
740 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
848 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
741 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
849 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
|
|
850 | [Wx:: => AnyEvent::Impl::POE::], |
|
|
851 | [Prima:: => AnyEvent::Impl::POE::], |
742 | ); |
852 | ); |
743 | |
853 | |
744 | our %method = map +($_ => 1), qw(io timer signal child condvar one_event DESTROY); |
854 | our %method = map +($_ => 1), qw(io timer time now signal child condvar one_event DESTROY); |
745 | |
855 | |
746 | our @post_detect; |
856 | our @post_detect; |
747 | |
857 | |
748 | sub post_detect(&) { |
858 | sub post_detect(&) { |
749 | my ($cb) = @_; |
859 | my ($cb) = @_; |
… | |
… | |
766 | } |
876 | } |
767 | |
877 | |
768 | sub detect() { |
878 | sub detect() { |
769 | unless ($MODEL) { |
879 | unless ($MODEL) { |
770 | no strict 'refs'; |
880 | no strict 'refs'; |
|
|
881 | local $SIG{__DIE__}; |
771 | |
882 | |
772 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
883 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
773 | my $model = "AnyEvent::Impl::$1"; |
884 | my $model = "AnyEvent::Impl::$1"; |
774 | if (eval "require $model") { |
885 | if (eval "require $model") { |
775 | $MODEL = $model; |
886 | $MODEL = $model; |
… | |
… | |
832 | $class->$func (@_); |
943 | $class->$func (@_); |
833 | } |
944 | } |
834 | |
945 | |
835 | package AnyEvent::Base; |
946 | package AnyEvent::Base; |
836 | |
947 | |
|
|
948 | # default implementation for now and time |
|
|
949 | |
|
|
950 | use Time::HiRes (); |
|
|
951 | |
|
|
952 | sub time { Time::HiRes::time } |
|
|
953 | sub now { Time::HiRes::time } |
|
|
954 | |
837 | # default implementation for ->condvar |
955 | # default implementation for ->condvar |
838 | |
956 | |
839 | sub condvar { |
957 | sub condvar { |
840 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
958 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
841 | } |
959 | } |
… | |
… | |
898 | or Carp::croak "required option 'pid' is missing"; |
1016 | or Carp::croak "required option 'pid' is missing"; |
899 | |
1017 | |
900 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1018 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
901 | |
1019 | |
902 | unless ($WNOHANG) { |
1020 | unless ($WNOHANG) { |
903 | $WNOHANG = eval { require POSIX; &POSIX::WNOHANG } || 1; |
1021 | $WNOHANG = eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
904 | } |
1022 | } |
905 | |
1023 | |
906 | unless ($CHLD_W) { |
1024 | unless ($CHLD_W) { |
907 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1025 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
908 | # child could be a zombie already, so make at least one round |
1026 | # child could be a zombie already, so make at least one round |
… | |
… | |
1055 | This functionality might change in future versions. |
1173 | This functionality might change in future versions. |
1056 | |
1174 | |
1057 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1175 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1058 | could start your program like this: |
1176 | could start your program like this: |
1059 | |
1177 | |
1060 | PERL_ANYEVENT_MODEL=Perl perl ... |
1178 | PERL_ANYEVENT_MODEL=Perl perl ... |
1061 | |
1179 | |
1062 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1180 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1063 | |
1181 | |
1064 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1182 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1065 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
1183 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
… | |
… | |
1087 | some (broken) firewalls drop such DNS packets, which is why it is off by |
1205 | some (broken) firewalls drop such DNS packets, which is why it is off by |
1088 | default. |
1206 | default. |
1089 | |
1207 | |
1090 | Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce |
1208 | Setting this variable to C<1> will cause L<AnyEvent::DNS> to announce |
1091 | EDNS0 in its DNS requests. |
1209 | EDNS0 in its DNS requests. |
|
|
1210 | |
|
|
1211 | =item C<PERL_ANYEVENT_MAX_FORKS> |
|
|
1212 | |
|
|
1213 | The maximum number of child processes that C<AnyEvent::Util::fork_call> |
|
|
1214 | will create in parallel. |
1092 | |
1215 | |
1093 | =back |
1216 | =back |
1094 | |
1217 | |
1095 | =head1 EXAMPLE PROGRAM |
1218 | =head1 EXAMPLE PROGRAM |
1096 | |
1219 | |
… | |
… | |
1535 | specified in the variable. |
1658 | specified in the variable. |
1536 | |
1659 | |
1537 | You can make AnyEvent completely ignore this variable by deleting it |
1660 | You can make AnyEvent completely ignore this variable by deleting it |
1538 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1661 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1539 | |
1662 | |
1540 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1663 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1541 | |
1664 | |
1542 | use AnyEvent; |
1665 | use AnyEvent; |
1543 | |
1666 | |
1544 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1667 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1545 | be used to probe what backend is used and gain other information (which is |
1668 | be used to probe what backend is used and gain other information (which is |
1546 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL). |
1669 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL). |
1547 | |
1670 | |
… | |
… | |
1568 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1691 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1569 | |
1692 | |
1570 | |
1693 | |
1571 | =head1 AUTHOR |
1694 | =head1 AUTHOR |
1572 | |
1695 | |
1573 | Marc Lehmann <schmorp@schmorp.de> |
1696 | Marc Lehmann <schmorp@schmorp.de> |
1574 | http://home.schmorp.de/ |
1697 | http://home.schmorp.de/ |
1575 | |
1698 | |
1576 | =cut |
1699 | =cut |
1577 | |
1700 | |
1578 | 1 |
1701 | 1 |
1579 | |
1702 | |