1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent - provide framework for multiple event loops |
3 | AnyEvent - the DBI of event loop programming |
4 | |
4 | |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Irssi, rxvt-unicode, IO::Async, Qt |
6 | event loops. |
6 | and POE are various supported event loops/environments. |
7 | |
7 | |
8 | =head1 SYNOPSIS |
8 | =head1 SYNOPSIS |
9 | |
9 | |
10 | use AnyEvent; |
10 | use AnyEvent; |
11 | |
11 | |
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40 | =head1 INTRODUCTION/TUTORIAL |
40 | =head1 INTRODUCTION/TUTORIAL |
41 | |
41 | |
42 | This manpage is mainly a reference manual. If you are interested |
42 | This manpage is mainly a reference manual. If you are interested |
43 | in a tutorial or some gentle introduction, have a look at the |
43 | in a tutorial or some gentle introduction, have a look at the |
44 | L<AnyEvent::Intro> manpage. |
44 | L<AnyEvent::Intro> manpage. |
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45 | |
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46 | =head1 SUPPORT |
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47 | |
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48 | There is a mailinglist for discussing all things AnyEvent, and an IRC |
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49 | channel, too. |
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50 | |
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51 | See the AnyEvent project page at the B<Schmorpforge Ta-Sa Software |
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52 | Repository>, at L<http://anyevent.schmorp.de>, for more info. |
45 | |
53 | |
46 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
54 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
47 | |
55 | |
48 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
56 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
49 | nowadays. So what is different about AnyEvent? |
57 | nowadays. So what is different about AnyEvent? |
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173 | my variables are only visible after the statement in which they are |
181 | my variables are only visible after the statement in which they are |
174 | declared. |
182 | declared. |
175 | |
183 | |
176 | =head2 I/O WATCHERS |
184 | =head2 I/O WATCHERS |
177 | |
185 | |
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186 | $w = AnyEvent->io ( |
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187 | fh => <filehandle_or_fileno>, |
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188 | poll => <"r" or "w">, |
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189 | cb => <callback>, |
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190 | ); |
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191 | |
178 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
192 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
179 | with the following mandatory key-value pairs as arguments: |
193 | with the following mandatory key-value pairs as arguments: |
180 | |
194 | |
181 | C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch |
195 | C<fh> is the Perl I<file handle> (or a naked file descriptor) to watch |
182 | for events (AnyEvent might or might not keep a reference to this file |
196 | for events (AnyEvent might or might not keep a reference to this file |
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211 | undef $w; |
225 | undef $w; |
212 | }); |
226 | }); |
213 | |
227 | |
214 | =head2 TIME WATCHERS |
228 | =head2 TIME WATCHERS |
215 | |
229 | |
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230 | $w = AnyEvent->timer (after => <seconds>, cb => <callback>); |
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231 | |
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232 | $w = AnyEvent->timer ( |
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233 | after => <fractional_seconds>, |
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234 | interval => <fractional_seconds>, |
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235 | cb => <callback>, |
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236 | ); |
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237 | |
216 | You can create a time watcher by calling the C<< AnyEvent->timer >> |
238 | You can create a time watcher by calling the C<< AnyEvent->timer >> |
217 | method with the following mandatory arguments: |
239 | method with the following mandatory arguments: |
218 | |
240 | |
219 | C<after> specifies after how many seconds (fractional values are |
241 | C<after> specifies after how many seconds (fractional values are |
220 | supported) the callback should be invoked. C<cb> is the callback to invoke |
242 | supported) the callback should be invoked. C<cb> is the callback to invoke |
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341 | might affect timers and time-outs. |
363 | might affect timers and time-outs. |
342 | |
364 | |
343 | When this is the case, you can call this method, which will update the |
365 | When this is the case, you can call this method, which will update the |
344 | event loop's idea of "current time". |
366 | event loop's idea of "current time". |
345 | |
367 | |
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368 | A typical example would be a script in a web server (e.g. C<mod_perl>) - |
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369 | when mod_perl executes the script, then the event loop will have the wrong |
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370 | idea about the "current time" (being potentially far in the past, when the |
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371 | script ran the last time). In that case you should arrange a call to C<< |
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372 | AnyEvent->now_update >> each time the web server process wakes up again |
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373 | (e.g. at the start of your script, or in a handler). |
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374 | |
346 | Note that updating the time I<might> cause some events to be handled. |
375 | Note that updating the time I<might> cause some events to be handled. |
347 | |
376 | |
348 | =back |
377 | =back |
349 | |
378 | |
350 | =head2 SIGNAL WATCHERS |
379 | =head2 SIGNAL WATCHERS |
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380 | |
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381 | $w = AnyEvent->signal (signal => <uppercase_signal_name>, cb => <callback>); |
351 | |
382 | |
352 | You can watch for signals using a signal watcher, C<signal> is the signal |
383 | You can watch for signals using a signal watcher, C<signal> is the signal |
353 | I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl |
384 | I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl |
354 | callback to be invoked whenever a signal occurs. |
385 | callback to be invoked whenever a signal occurs. |
355 | |
386 | |
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361 | invocation, and callback invocation will be synchronous. Synchronous means |
392 | invocation, and callback invocation will be synchronous. Synchronous means |
362 | that it might take a while until the signal gets handled by the process, |
393 | that it might take a while until the signal gets handled by the process, |
363 | but it is guaranteed not to interrupt any other callbacks. |
394 | but it is guaranteed not to interrupt any other callbacks. |
364 | |
395 | |
365 | The main advantage of using these watchers is that you can share a signal |
396 | The main advantage of using these watchers is that you can share a signal |
366 | between multiple watchers. |
397 | between multiple watchers, and AnyEvent will ensure that signals will not |
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398 | interrupt your program at bad times. |
367 | |
399 | |
368 | This watcher might use C<%SIG>, so programs overwriting those signals |
400 | This watcher might use C<%SIG> (depending on the event loop used), |
369 | directly will likely not work correctly. |
401 | so programs overwriting those signals directly will likely not work |
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402 | correctly. |
370 | |
403 | |
371 | Example: exit on SIGINT |
404 | Example: exit on SIGINT |
372 | |
405 | |
373 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
406 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
374 | |
407 | |
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408 | =head3 Restart Behaviour |
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409 | |
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410 | While restart behaviour is up to the event loop implementation, most will |
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411 | not restart syscalls (that includes L<Async::Interrupt> and AnyEvent's |
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412 | pure perl implementation). |
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413 | |
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414 | =head3 Safe/Unsafe Signals |
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415 | |
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416 | Perl signals can be either "safe" (synchronous to opcode handling) or |
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417 | "unsafe" (asynchronous) - the former might get delayed indefinitely, the |
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418 | latter might corrupt your memory. |
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419 | |
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420 | AnyEvent signal handlers are, in addition, synchronous to the event loop, |
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421 | i.e. they will not interrupt your running perl program but will only be |
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422 | called as part of the normal event handling (just like timer, I/O etc. |
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423 | callbacks, too). |
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424 | |
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425 | =head3 Signal Races, Delays and Workarounds |
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426 | |
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427 | Many event loops (e.g. Glib, Tk, Qt, IO::Async) do not support attaching |
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428 | callbacks to signals in a generic way, which is a pity, as you cannot |
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429 | do race-free signal handling in perl, requiring C libraries for |
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430 | this. AnyEvent will try to do it's best, which means in some cases, |
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431 | signals will be delayed. The maximum time a signal might be delayed is |
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432 | specified in C<$AnyEvent::MAX_SIGNAL_LATENCY> (default: 10 seconds). This |
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433 | variable can be changed only before the first signal watcher is created, |
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434 | and should be left alone otherwise. This variable determines how often |
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435 | AnyEvent polls for signals (in case a wake-up was missed). Higher values |
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436 | will cause fewer spurious wake-ups, which is better for power and CPU |
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437 | saving. |
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438 | |
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439 | All these problems can be avoided by installing the optional |
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440 | L<Async::Interrupt> module, which works with most event loops. It will not |
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441 | work with inherently broken event loops such as L<Event> or L<Event::Lib> |
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442 | (and not with L<POE> currently, as POE does it's own workaround with |
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443 | one-second latency). For those, you just have to suffer the delays. |
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444 | |
375 | =head2 CHILD PROCESS WATCHERS |
445 | =head2 CHILD PROCESS WATCHERS |
376 | |
446 | |
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447 | $w = AnyEvent->child (pid => <process id>, cb => <callback>); |
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448 | |
377 | You can also watch on a child process exit and catch its exit status. |
449 | You can also watch on a child process exit and catch its exit status. |
378 | |
450 | |
379 | The child process is specified by the C<pid> argument (if set to C<0>, it |
451 | The child process is specified by the C<pid> argument (one some backends, |
380 | watches for any child process exit). The watcher will triggered only when |
452 | using C<0> watches for any child process exit, on others this will |
381 | the child process has finished and an exit status is available, not on |
453 | croak). The watcher will be triggered only when the child process has |
382 | any trace events (stopped/continued). |
454 | finished and an exit status is available, not on any trace events |
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455 | (stopped/continued). |
383 | |
456 | |
384 | The callback will be called with the pid and exit status (as returned by |
457 | The callback will be called with the pid and exit status (as returned by |
385 | waitpid), so unlike other watcher types, you I<can> rely on child watcher |
458 | waitpid), so unlike other watcher types, you I<can> rely on child watcher |
386 | callback arguments. |
459 | callback arguments. |
387 | |
460 | |
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403 | |
476 | |
404 | This means you cannot create a child watcher as the very first |
477 | This means you cannot create a child watcher as the very first |
405 | thing in an AnyEvent program, you I<have> to create at least one |
478 | thing in an AnyEvent program, you I<have> to create at least one |
406 | watcher before you C<fork> the child (alternatively, you can call |
479 | watcher before you C<fork> the child (alternatively, you can call |
407 | C<AnyEvent::detect>). |
480 | C<AnyEvent::detect>). |
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481 | |
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482 | As most event loops do not support waiting for child events, they will be |
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483 | emulated by AnyEvent in most cases, in which the latency and race problems |
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484 | mentioned in the description of signal watchers apply. |
408 | |
485 | |
409 | Example: fork a process and wait for it |
486 | Example: fork a process and wait for it |
410 | |
487 | |
411 | my $done = AnyEvent->condvar; |
488 | my $done = AnyEvent->condvar; |
412 | |
489 | |
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424 | # do something else, then wait for process exit |
501 | # do something else, then wait for process exit |
425 | $done->recv; |
502 | $done->recv; |
426 | |
503 | |
427 | =head2 IDLE WATCHERS |
504 | =head2 IDLE WATCHERS |
428 | |
505 | |
429 | Sometimes there is a need to do something, but it is not so important |
506 | $w = AnyEvent->idle (cb => <callback>); |
430 | to do it instantly, but only when there is nothing better to do. This |
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431 | "nothing better to do" is usually defined to be "no other events need |
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432 | attention by the event loop". |
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433 | |
507 | |
434 | Idle watchers ideally get invoked when the event loop has nothing |
508 | Repeatedly invoke the callback after the process becomes idle, until |
435 | better to do, just before it would block the process to wait for new |
509 | either the watcher is destroyed or new events have been detected. |
436 | events. Instead of blocking, the idle watcher is invoked. |
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437 | |
510 | |
438 | Most event loops unfortunately do not really support idle watchers (only |
511 | Idle watchers are useful when there is a need to do something, but it |
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512 | is not so important (or wise) to do it instantly. The callback will be |
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513 | invoked only when there is "nothing better to do", which is usually |
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514 | defined as "all outstanding events have been handled and no new events |
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515 | have been detected". That means that idle watchers ideally get invoked |
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516 | when the event loop has just polled for new events but none have been |
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517 | detected. Instead of blocking to wait for more events, the idle watchers |
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518 | will be invoked. |
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519 | |
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520 | Unfortunately, most event loops do not really support idle watchers (only |
439 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
521 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
440 | will simply call the callback "from time to time". |
522 | will simply call the callback "from time to time". |
441 | |
523 | |
442 | Example: read lines from STDIN, but only process them when the |
524 | Example: read lines from STDIN, but only process them when the |
443 | program is otherwise idle: |
525 | program is otherwise idle: |
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459 | }); |
541 | }); |
460 | }); |
542 | }); |
461 | |
543 | |
462 | =head2 CONDITION VARIABLES |
544 | =head2 CONDITION VARIABLES |
463 | |
545 | |
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546 | $cv = AnyEvent->condvar; |
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547 | |
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548 | $cv->send (<list>); |
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549 | my @res = $cv->recv; |
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550 | |
464 | If you are familiar with some event loops you will know that all of them |
551 | If you are familiar with some event loops you will know that all of them |
465 | require you to run some blocking "loop", "run" or similar function that |
552 | require you to run some blocking "loop", "run" or similar function that |
466 | will actively watch for new events and call your callbacks. |
553 | will actively watch for new events and call your callbacks. |
467 | |
554 | |
468 | AnyEvent is different, it expects somebody else to run the event loop and |
555 | AnyEvent is slightly different: it expects somebody else to run the event |
469 | will only block when necessary (usually when told by the user). |
556 | loop and will only block when necessary (usually when told by the user). |
470 | |
557 | |
471 | The instrument to do that is called a "condition variable", so called |
558 | The instrument to do that is called a "condition variable", so called |
472 | because they represent a condition that must become true. |
559 | because they represent a condition that must become true. |
473 | |
560 | |
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561 | Now is probably a good time to look at the examples further below. |
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562 | |
474 | Condition variables can be created by calling the C<< AnyEvent->condvar |
563 | Condition variables can be created by calling the C<< AnyEvent->condvar |
475 | >> method, usually without arguments. The only argument pair allowed is |
564 | >> method, usually without arguments. The only argument pair allowed is |
476 | |
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477 | C<cb>, which specifies a callback to be called when the condition variable |
565 | C<cb>, which specifies a callback to be called when the condition variable |
478 | becomes true, with the condition variable as the first argument (but not |
566 | becomes true, with the condition variable as the first argument (but not |
479 | the results). |
567 | the results). |
480 | |
568 | |
481 | After creation, the condition variable is "false" until it becomes "true" |
569 | After creation, the condition variable is "false" until it becomes "true" |
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486 | Condition variables are similar to callbacks, except that you can |
574 | Condition variables are similar to callbacks, except that you can |
487 | optionally wait for them. They can also be called merge points - points |
575 | optionally wait for them. They can also be called merge points - points |
488 | in time where multiple outstanding events have been processed. And yet |
576 | in time where multiple outstanding events have been processed. And yet |
489 | another way to call them is transactions - each condition variable can be |
577 | another way to call them is transactions - each condition variable can be |
490 | used to represent a transaction, which finishes at some point and delivers |
578 | used to represent a transaction, which finishes at some point and delivers |
491 | a result. |
579 | a result. And yet some people know them as "futures" - a promise to |
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580 | compute/deliver something that you can wait for. |
492 | |
581 | |
493 | Condition variables are very useful to signal that something has finished, |
582 | Condition variables are very useful to signal that something has finished, |
494 | for example, if you write a module that does asynchronous http requests, |
583 | for example, if you write a module that does asynchronous http requests, |
495 | then a condition variable would be the ideal candidate to signal the |
584 | then a condition variable would be the ideal candidate to signal the |
496 | availability of results. The user can either act when the callback is |
585 | availability of results. The user can either act when the callback is |
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530 | after => 1, |
619 | after => 1, |
531 | cb => sub { $result_ready->send }, |
620 | cb => sub { $result_ready->send }, |
532 | ); |
621 | ); |
533 | |
622 | |
534 | # this "blocks" (while handling events) till the callback |
623 | # this "blocks" (while handling events) till the callback |
535 | # calls send |
624 | # calls ->send |
536 | $result_ready->recv; |
625 | $result_ready->recv; |
537 | |
626 | |
538 | Example: wait for a timer, but take advantage of the fact that |
627 | Example: wait for a timer, but take advantage of the fact that condition |
539 | condition variables are also code references. |
628 | variables are also callable directly. |
540 | |
629 | |
541 | my $done = AnyEvent->condvar; |
630 | my $done = AnyEvent->condvar; |
542 | my $delay = AnyEvent->timer (after => 5, cb => $done); |
631 | my $delay = AnyEvent->timer (after => 5, cb => $done); |
543 | $done->recv; |
632 | $done->recv; |
544 | |
633 | |
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550 | |
639 | |
551 | ... |
640 | ... |
552 | |
641 | |
553 | my @info = $couchdb->info->recv; |
642 | my @info = $couchdb->info->recv; |
554 | |
643 | |
555 | And this is how you would just ste a callback to be called whenever the |
644 | And this is how you would just set a callback to be called whenever the |
556 | results are available: |
645 | results are available: |
557 | |
646 | |
558 | $couchdb->info->cb (sub { |
647 | $couchdb->info->cb (sub { |
559 | my @info = $_[0]->recv; |
648 | my @info = $_[0]->recv; |
560 | }); |
649 | }); |
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578 | immediately from within send. |
667 | immediately from within send. |
579 | |
668 | |
580 | Any arguments passed to the C<send> call will be returned by all |
669 | Any arguments passed to the C<send> call will be returned by all |
581 | future C<< ->recv >> calls. |
670 | future C<< ->recv >> calls. |
582 | |
671 | |
583 | Condition variables are overloaded so one can call them directly |
672 | Condition variables are overloaded so one can call them directly (as if |
584 | (as a code reference). Calling them directly is the same as calling |
673 | they were a code reference). Calling them directly is the same as calling |
585 | C<send>. Note, however, that many C-based event loops do not handle |
674 | C<send>. |
586 | overloading, so as tempting as it may be, passing a condition variable |
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587 | instead of a callback does not work. Both the pure perl and EV loops |
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588 | support overloading, however, as well as all functions that use perl to |
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589 | invoke a callback (as in L<AnyEvent::Socket> and L<AnyEvent::DNS> for |
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590 | example). |
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591 | |
675 | |
592 | =item $cv->croak ($error) |
676 | =item $cv->croak ($error) |
593 | |
677 | |
594 | Similar to send, but causes all call's to C<< ->recv >> to invoke |
678 | Similar to send, but causes all call's to C<< ->recv >> to invoke |
595 | C<Carp::croak> with the given error message/object/scalar. |
679 | C<Carp::croak> with the given error message/object/scalar. |
596 | |
680 | |
597 | This can be used to signal any errors to the condition variable |
681 | This can be used to signal any errors to the condition variable |
598 | user/consumer. |
682 | user/consumer. Doing it this way instead of calling C<croak> directly |
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683 | delays the error detetcion, but has the overwhelmign advantage that it |
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684 | diagnoses the error at the place where the result is expected, and not |
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685 | deep in some event clalback without connection to the actual code causing |
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686 | the problem. |
599 | |
687 | |
600 | =item $cv->begin ([group callback]) |
688 | =item $cv->begin ([group callback]) |
601 | |
689 | |
602 | =item $cv->end |
690 | =item $cv->end |
603 | |
691 | |
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605 | one. For example, a function that pings many hosts in parallel might want |
693 | one. For example, a function that pings many hosts in parallel might want |
606 | to use a condition variable for the whole process. |
694 | to use a condition variable for the whole process. |
607 | |
695 | |
608 | Every call to C<< ->begin >> will increment a counter, and every call to |
696 | Every call to C<< ->begin >> will increment a counter, and every call to |
609 | C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end |
697 | C<< ->end >> will decrement it. If the counter reaches C<0> in C<< ->end |
610 | >>, the (last) callback passed to C<begin> will be executed. That callback |
698 | >>, the (last) callback passed to C<begin> will be executed, passing the |
611 | is I<supposed> to call C<< ->send >>, but that is not required. If no |
699 | condvar as first argument. That callback is I<supposed> to call C<< ->send |
612 | callback was set, C<send> will be called without any arguments. |
700 | >>, but that is not required. If no group callback was set, C<send> will |
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701 | be called without any arguments. |
613 | |
702 | |
614 | You can think of C<< $cv->send >> giving you an OR condition (one call |
703 | You can think of C<< $cv->send >> giving you an OR condition (one call |
615 | sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND |
704 | sends), while C<< $cv->begin >> and C<< $cv->end >> giving you an AND |
616 | condition (all C<begin> calls must be C<end>'ed before the condvar sends). |
705 | condition (all C<begin> calls must be C<end>'ed before the condvar sends). |
617 | |
706 | |
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644 | begung can potentially be zero: |
733 | begung can potentially be zero: |
645 | |
734 | |
646 | my $cv = AnyEvent->condvar; |
735 | my $cv = AnyEvent->condvar; |
647 | |
736 | |
648 | my %result; |
737 | my %result; |
649 | $cv->begin (sub { $cv->send (\%result) }); |
738 | $cv->begin (sub { shift->send (\%result) }); |
650 | |
739 | |
651 | for my $host (@list_of_hosts) { |
740 | for my $host (@list_of_hosts) { |
652 | $cv->begin; |
741 | $cv->begin; |
653 | ping_host_then_call_callback $host, sub { |
742 | ping_host_then_call_callback $host, sub { |
654 | $result{$host} = ...; |
743 | $result{$host} = ...; |
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699 | function will call C<croak>. |
788 | function will call C<croak>. |
700 | |
789 | |
701 | In list context, all parameters passed to C<send> will be returned, |
790 | In list context, all parameters passed to C<send> will be returned, |
702 | in scalar context only the first one will be returned. |
791 | in scalar context only the first one will be returned. |
703 | |
792 | |
|
|
793 | Note that doing a blocking wait in a callback is not supported by any |
|
|
794 | event loop, that is, recursive invocation of a blocking C<< ->recv |
|
|
795 | >> is not allowed, and the C<recv> call will C<croak> if such a |
|
|
796 | condition is detected. This condition can be slightly loosened by using |
|
|
797 | L<Coro::AnyEvent>, which allows you to do a blocking C<< ->recv >> from |
|
|
798 | any thread that doesn't run the event loop itself. |
|
|
799 | |
704 | Not all event models support a blocking wait - some die in that case |
800 | Not all event models support a blocking wait - some die in that case |
705 | (programs might want to do that to stay interactive), so I<if you are |
801 | (programs might want to do that to stay interactive), so I<if you are |
706 | using this from a module, never require a blocking wait>, but let the |
802 | using this from a module, never require a blocking wait>. Instead, let the |
707 | caller decide whether the call will block or not (for example, by coupling |
803 | caller decide whether the call will block or not (for example, by coupling |
708 | condition variables with some kind of request results and supporting |
804 | condition variables with some kind of request results and supporting |
709 | callbacks so the caller knows that getting the result will not block, |
805 | callbacks so the caller knows that getting the result will not block, |
710 | while still supporting blocking waits if the caller so desires). |
806 | while still supporting blocking waits if the caller so desires). |
711 | |
807 | |
712 | Another reason I<never> to C<< ->recv >> in a module is that you cannot |
|
|
713 | sensibly have two C<< ->recv >>'s in parallel, as that would require |
|
|
714 | multiple interpreters or coroutines/threads, none of which C<AnyEvent> |
|
|
715 | can supply. |
|
|
716 | |
|
|
717 | The L<Coro> module, however, I<can> and I<does> supply coroutines and, in |
|
|
718 | fact, L<Coro::AnyEvent> replaces AnyEvent's condvars by coroutine-safe |
|
|
719 | versions and also integrates coroutines into AnyEvent, making blocking |
|
|
720 | C<< ->recv >> calls perfectly safe as long as they are done from another |
|
|
721 | coroutine (one that doesn't run the event loop). |
|
|
722 | |
|
|
723 | You can ensure that C<< -recv >> never blocks by setting a callback and |
808 | You can ensure that C<< -recv >> never blocks by setting a callback and |
724 | only calling C<< ->recv >> from within that callback (or at a later |
809 | only calling C<< ->recv >> from within that callback (or at a later |
725 | time). This will work even when the event loop does not support blocking |
810 | time). This will work even when the event loop does not support blocking |
726 | waits otherwise. |
811 | waits otherwise. |
727 | |
812 | |
… | |
… | |
733 | =item $cb = $cv->cb ($cb->($cv)) |
818 | =item $cb = $cv->cb ($cb->($cv)) |
734 | |
819 | |
735 | This is a mutator function that returns the callback set and optionally |
820 | This is a mutator function that returns the callback set and optionally |
736 | replaces it before doing so. |
821 | replaces it before doing so. |
737 | |
822 | |
738 | The callback will be called when the condition becomes "true", i.e. when |
823 | The callback will be called when the condition becomes (or already was) |
739 | C<send> or C<croak> are called, with the only argument being the condition |
824 | "true", i.e. when C<send> or C<croak> are called (or were called), with |
740 | variable itself. Calling C<recv> inside the callback or at any later time |
825 | the only argument being the condition variable itself. Calling C<recv> |
741 | is guaranteed not to block. |
826 | inside the callback or at any later time is guaranteed not to block. |
742 | |
827 | |
743 | =back |
828 | =back |
744 | |
829 | |
745 | =head1 SUPPORTED EVENT LOOPS/BACKENDS |
830 | =head1 SUPPORTED EVENT LOOPS/BACKENDS |
746 | |
831 | |
… | |
… | |
749 | =over 4 |
834 | =over 4 |
750 | |
835 | |
751 | =item Backends that are autoprobed when no other event loop can be found. |
836 | =item Backends that are autoprobed when no other event loop can be found. |
752 | |
837 | |
753 | EV is the preferred backend when no other event loop seems to be in |
838 | EV is the preferred backend when no other event loop seems to be in |
754 | use. If EV is not installed, then AnyEvent will try Event, and, failing |
839 | use. If EV is not installed, then AnyEvent will fall back to its own |
755 | that, will fall back to its own pure-perl implementation, which is |
840 | pure-perl implementation, which is available everywhere as it comes with |
756 | available everywhere as it comes with AnyEvent itself. |
841 | AnyEvent itself. |
757 | |
842 | |
758 | AnyEvent::Impl::EV based on EV (interface to libev, best choice). |
843 | AnyEvent::Impl::EV based on EV (interface to libev, best choice). |
759 | AnyEvent::Impl::Event based on Event, very stable, few glitches. |
|
|
760 | AnyEvent::Impl::Perl pure-perl implementation, fast and portable. |
844 | AnyEvent::Impl::Perl pure-perl implementation, fast and portable. |
761 | |
845 | |
762 | =item Backends that are transparently being picked up when they are used. |
846 | =item Backends that are transparently being picked up when they are used. |
763 | |
847 | |
764 | These will be used when they are currently loaded when the first watcher |
848 | These will be used when they are currently loaded when the first watcher |
765 | is created, in which case it is assumed that the application is using |
849 | is created, in which case it is assumed that the application is using |
766 | them. This means that AnyEvent will automatically pick the right backend |
850 | them. This means that AnyEvent will automatically pick the right backend |
767 | when the main program loads an event module before anything starts to |
851 | when the main program loads an event module before anything starts to |
768 | create watchers. Nothing special needs to be done by the main program. |
852 | create watchers. Nothing special needs to be done by the main program. |
769 | |
853 | |
|
|
854 | AnyEvent::Impl::Event based on Event, very stable, few glitches. |
770 | AnyEvent::Impl::Glib based on Glib, slow but very stable. |
855 | AnyEvent::Impl::Glib based on Glib, slow but very stable. |
771 | AnyEvent::Impl::Tk based on Tk, very broken. |
856 | AnyEvent::Impl::Tk based on Tk, very broken. |
772 | AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse. |
857 | AnyEvent::Impl::EventLib based on Event::Lib, leaks memory and worse. |
773 | AnyEvent::Impl::POE based on POE, very slow, some limitations. |
858 | AnyEvent::Impl::POE based on POE, very slow, some limitations. |
|
|
859 | AnyEvent::Impl::Irssi used when running within irssi. |
774 | |
860 | |
775 | =item Backends with special needs. |
861 | =item Backends with special needs. |
776 | |
862 | |
777 | Qt requires the Qt::Application to be instantiated first, but will |
863 | Qt requires the Qt::Application to be instantiated first, but will |
778 | otherwise be picked up automatically. As long as the main program |
864 | otherwise be picked up automatically. As long as the main program |
… | |
… | |
852 | event module detection too early, for example, L<AnyEvent::AIO> creates |
938 | event module detection too early, for example, L<AnyEvent::AIO> creates |
853 | and installs the global L<IO::AIO> watcher in a C<post_detect> block to |
939 | and installs the global L<IO::AIO> watcher in a C<post_detect> block to |
854 | avoid autodetecting the event module at load time. |
940 | avoid autodetecting the event module at load time. |
855 | |
941 | |
856 | If called in scalar or list context, then it creates and returns an object |
942 | If called in scalar or list context, then it creates and returns an object |
857 | that automatically removes the callback again when it is destroyed. See |
943 | that automatically removes the callback again when it is destroyed (or |
|
|
944 | C<undef> when the hook was immediately executed). See L<AnyEvent::AIO> for |
858 | L<Coro::BDB> for a case where this is useful. |
945 | a case where this is useful. |
|
|
946 | |
|
|
947 | Example: Create a watcher for the IO::AIO module and store it in |
|
|
948 | C<$WATCHER>. Only do so after the event loop is initialised, though. |
|
|
949 | |
|
|
950 | our WATCHER; |
|
|
951 | |
|
|
952 | my $guard = AnyEvent::post_detect { |
|
|
953 | $WATCHER = AnyEvent->io (fh => IO::AIO::poll_fileno, poll => 'r', cb => \&IO::AIO::poll_cb); |
|
|
954 | }; |
|
|
955 | |
|
|
956 | # the ||= is important in case post_detect immediately runs the block, |
|
|
957 | # as to not clobber the newly-created watcher. assigning both watcher and |
|
|
958 | # post_detect guard to the same variable has the advantage of users being |
|
|
959 | # able to just C<undef $WATCHER> if the watcher causes them grief. |
|
|
960 | |
|
|
961 | $WATCHER ||= $guard; |
859 | |
962 | |
860 | =item @AnyEvent::post_detect |
963 | =item @AnyEvent::post_detect |
861 | |
964 | |
862 | If there are any code references in this array (you can C<push> to it |
965 | If there are any code references in this array (you can C<push> to it |
863 | before or after loading AnyEvent), then they will called directly after |
966 | before or after loading AnyEvent), then they will called directly after |
… | |
… | |
866 | You should check C<$AnyEvent::MODEL> before adding to this array, though: |
969 | You should check C<$AnyEvent::MODEL> before adding to this array, though: |
867 | if it is defined then the event loop has already been detected, and the |
970 | if it is defined then the event loop has already been detected, and the |
868 | array will be ignored. |
971 | array will be ignored. |
869 | |
972 | |
870 | Best use C<AnyEvent::post_detect { BLOCK }> when your application allows |
973 | Best use C<AnyEvent::post_detect { BLOCK }> when your application allows |
871 | it,as it takes care of these details. |
974 | it, as it takes care of these details. |
872 | |
975 | |
873 | This variable is mainly useful for modules that can do something useful |
976 | This variable is mainly useful for modules that can do something useful |
874 | when AnyEvent is used and thus want to know when it is initialised, but do |
977 | when AnyEvent is used and thus want to know when it is initialised, but do |
875 | not need to even load it by default. This array provides the means to hook |
978 | not need to even load it by default. This array provides the means to hook |
876 | into AnyEvent passively, without loading it. |
979 | into AnyEvent passively, without loading it. |
|
|
980 | |
|
|
981 | Example: To load Coro::AnyEvent whenever Coro and AnyEvent are used |
|
|
982 | together, you could put this into Coro (this is the actual code used by |
|
|
983 | Coro to accomplish this): |
|
|
984 | |
|
|
985 | if (defined $AnyEvent::MODEL) { |
|
|
986 | # AnyEvent already initialised, so load Coro::AnyEvent |
|
|
987 | require Coro::AnyEvent; |
|
|
988 | } else { |
|
|
989 | # AnyEvent not yet initialised, so make sure to load Coro::AnyEvent |
|
|
990 | # as soon as it is |
|
|
991 | push @AnyEvent::post_detect, sub { require Coro::AnyEvent }; |
|
|
992 | } |
877 | |
993 | |
878 | =back |
994 | =back |
879 | |
995 | |
880 | =head1 WHAT TO DO IN A MODULE |
996 | =head1 WHAT TO DO IN A MODULE |
881 | |
997 | |
… | |
… | |
1028 | |
1144 | |
1029 | =cut |
1145 | =cut |
1030 | |
1146 | |
1031 | package AnyEvent; |
1147 | package AnyEvent; |
1032 | |
1148 | |
1033 | no warnings; |
1149 | # basically a tuned-down version of common::sense |
1034 | use strict qw(vars subs); |
1150 | sub common_sense { |
|
|
1151 | # from common:.sense 1.0 |
|
|
1152 | ${^WARNING_BITS} = "\xfc\x3f\x33\x00\x0f\xf3\xcf\xc0\xf3\xfc\x33\x00"; |
|
|
1153 | # use strict vars subs - NO UTF-8, as Util.pm doesn't like this atm. (uts46data.pl) |
|
|
1154 | $^H |= 0x00000600; |
|
|
1155 | } |
1035 | |
1156 | |
|
|
1157 | BEGIN { AnyEvent::common_sense } |
|
|
1158 | |
1036 | use Carp; |
1159 | use Carp (); |
1037 | |
1160 | |
1038 | our $VERSION = 4.801; |
1161 | our $VERSION = '5.24'; |
1039 | our $MODEL; |
1162 | our $MODEL; |
1040 | |
1163 | |
1041 | our $AUTOLOAD; |
1164 | our $AUTOLOAD; |
1042 | our @ISA; |
1165 | our @ISA; |
1043 | |
1166 | |
1044 | our @REGISTRY; |
1167 | our @REGISTRY; |
1045 | |
1168 | |
1046 | our $WIN32; |
1169 | our $VERBOSE; |
1047 | |
1170 | |
1048 | BEGIN { |
1171 | BEGIN { |
|
|
1172 | eval "sub CYGWIN(){" . (($^O =~ /cygwin/i) *1) . "}"; |
1049 | eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }"; |
1173 | eval "sub WIN32 (){" . (($^O =~ /mswin32/i)*1) . "}"; |
1050 | eval "sub TAINT(){ " . (${^TAINT}*1) . " }"; |
1174 | eval "sub TAINT (){" . (${^TAINT} *1) . "}"; |
1051 | |
1175 | |
1052 | delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} |
1176 | delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} |
1053 | if ${^TAINT}; |
1177 | if ${^TAINT}; |
1054 | } |
|
|
1055 | |
1178 | |
1056 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
1179 | $VERBOSE = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
|
|
1180 | |
|
|
1181 | } |
|
|
1182 | |
|
|
1183 | our $MAX_SIGNAL_LATENCY = 10; |
1057 | |
1184 | |
1058 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
1185 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
1059 | |
1186 | |
1060 | { |
1187 | { |
1061 | my $idx; |
1188 | my $idx; |
… | |
… | |
1063 | for reverse split /\s*,\s*/, |
1190 | for reverse split /\s*,\s*/, |
1064 | $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
1191 | $ENV{PERL_ANYEVENT_PROTOCOLS} || "ipv4,ipv6"; |
1065 | } |
1192 | } |
1066 | |
1193 | |
1067 | my @models = ( |
1194 | my @models = ( |
1068 | [EV:: => AnyEvent::Impl::EV::], |
1195 | [EV:: => AnyEvent::Impl::EV:: , 1], |
1069 | [Event:: => AnyEvent::Impl::Event::], |
|
|
1070 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
1196 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl:: , 1], |
1071 | # everything below here will not be autoprobed |
1197 | # everything below here will not (normally) be autoprobed |
1072 | # as the pureperl backend should work everywhere |
1198 | # as the pureperl backend should work everywhere |
1073 | # and is usually faster |
1199 | # and is usually faster |
|
|
1200 | [Event:: => AnyEvent::Impl::Event::, 1], |
1074 | [Glib:: => AnyEvent::Impl::Glib::], # becomes extremely slow with many watchers |
1201 | [Glib:: => AnyEvent::Impl::Glib:: , 1], # becomes extremely slow with many watchers |
1075 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
1202 | [Event::Lib:: => AnyEvent::Impl::EventLib::], # too buggy |
|
|
1203 | [Irssi:: => AnyEvent::Impl::Irssi::], # Irssi has a bogus "Event" package |
1076 | [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles |
1204 | [Tk:: => AnyEvent::Impl::Tk::], # crashes with many handles |
|
|
1205 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
1077 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
1206 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
1078 | [Qt:: => AnyEvent::Impl::Qt::], # requires special main program |
|
|
1079 | [Wx:: => AnyEvent::Impl::POE::], |
1207 | [Wx:: => AnyEvent::Impl::POE::], |
1080 | [Prima:: => AnyEvent::Impl::POE::], |
1208 | [Prima:: => AnyEvent::Impl::POE::], |
1081 | # IO::Async is just too broken - we would need workarounds for its |
1209 | # IO::Async is just too broken - we would need workarounds for its |
1082 | # byzantine signal and broken child handling, among others. |
1210 | # byzantine signal and broken child handling, among others. |
1083 | # IO::Async is rather hard to detect, as it doesn't have any |
1211 | # IO::Async is rather hard to detect, as it doesn't have any |
1084 | # obvious default class. |
1212 | # obvious default class. |
1085 | # [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1213 | [IO::Async:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1086 | # [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1214 | [IO::Async::Loop:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1087 | # [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1215 | [IO::Async::Notifier:: => AnyEvent::Impl::IOAsync::], # requires special main program |
|
|
1216 | [AnyEvent::Impl::IOAsync:: => AnyEvent::Impl::IOAsync::], # requires special main program |
1088 | ); |
1217 | ); |
1089 | |
1218 | |
1090 | our %method = map +($_ => 1), |
1219 | our %method = map +($_ => 1), |
1091 | qw(io timer time now now_update signal child idle condvar one_event DESTROY); |
1220 | qw(io timer time now now_update signal child idle condvar one_event DESTROY); |
1092 | |
1221 | |
… | |
… | |
1096 | my ($cb) = @_; |
1225 | my ($cb) = @_; |
1097 | |
1226 | |
1098 | if ($MODEL) { |
1227 | if ($MODEL) { |
1099 | $cb->(); |
1228 | $cb->(); |
1100 | |
1229 | |
1101 | 1 |
1230 | undef |
1102 | } else { |
1231 | } else { |
1103 | push @post_detect, $cb; |
1232 | push @post_detect, $cb; |
1104 | |
1233 | |
1105 | defined wantarray |
1234 | defined wantarray |
1106 | ? bless \$cb, "AnyEvent::Util::postdetect" |
1235 | ? bless \$cb, "AnyEvent::Util::postdetect" |
… | |
… | |
1112 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
1241 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
1113 | } |
1242 | } |
1114 | |
1243 | |
1115 | sub detect() { |
1244 | sub detect() { |
1116 | unless ($MODEL) { |
1245 | unless ($MODEL) { |
1117 | no strict 'refs'; |
|
|
1118 | local $SIG{__DIE__}; |
1246 | local $SIG{__DIE__}; |
1119 | |
1247 | |
1120 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
1248 | if ($ENV{PERL_ANYEVENT_MODEL} =~ /^([a-zA-Z]+)$/) { |
1121 | my $model = "AnyEvent::Impl::$1"; |
1249 | my $model = "AnyEvent::Impl::$1"; |
1122 | if (eval "require $model") { |
1250 | if (eval "require $model") { |
1123 | $MODEL = $model; |
1251 | $MODEL = $model; |
1124 | warn "AnyEvent: loaded model '$model' (forced by \$PERL_ANYEVENT_MODEL), using it.\n" if $verbose > 1; |
1252 | warn "AnyEvent: loaded model '$model' (forced by \$ENV{PERL_ANYEVENT_MODEL}), using it.\n" if $VERBOSE >= 2; |
1125 | } else { |
1253 | } else { |
1126 | warn "AnyEvent: unable to load model '$model' (from \$PERL_ANYEVENT_MODEL):\n$@" if $verbose; |
1254 | warn "AnyEvent: unable to load model '$model' (from \$ENV{PERL_ANYEVENT_MODEL}):\n$@" if $VERBOSE; |
1127 | } |
1255 | } |
1128 | } |
1256 | } |
1129 | |
1257 | |
1130 | # check for already loaded models |
1258 | # check for already loaded models |
1131 | unless ($MODEL) { |
1259 | unless ($MODEL) { |
1132 | for (@REGISTRY, @models) { |
1260 | for (@REGISTRY, @models) { |
1133 | my ($package, $model) = @$_; |
1261 | my ($package, $model) = @$_; |
1134 | if (${"$package\::VERSION"} > 0) { |
1262 | if (${"$package\::VERSION"} > 0) { |
1135 | if (eval "require $model") { |
1263 | if (eval "require $model") { |
1136 | $MODEL = $model; |
1264 | $MODEL = $model; |
1137 | warn "AnyEvent: autodetected model '$model', using it.\n" if $verbose > 1; |
1265 | warn "AnyEvent: autodetected model '$model', using it.\n" if $VERBOSE >= 2; |
1138 | last; |
1266 | last; |
1139 | } |
1267 | } |
1140 | } |
1268 | } |
1141 | } |
1269 | } |
1142 | |
1270 | |
1143 | unless ($MODEL) { |
1271 | unless ($MODEL) { |
1144 | # try to load a model |
1272 | # try to autoload a model |
1145 | |
|
|
1146 | for (@REGISTRY, @models) { |
1273 | for (@REGISTRY, @models) { |
1147 | my ($package, $model) = @$_; |
1274 | my ($package, $model, $autoload) = @$_; |
|
|
1275 | if ( |
|
|
1276 | $autoload |
1148 | if (eval "require $package" |
1277 | and eval "require $package" |
1149 | and ${"$package\::VERSION"} > 0 |
1278 | and ${"$package\::VERSION"} > 0 |
1150 | and eval "require $model") { |
1279 | and eval "require $model" |
|
|
1280 | ) { |
1151 | $MODEL = $model; |
1281 | $MODEL = $model; |
1152 | warn "AnyEvent: autoprobed model '$model', using it.\n" if $verbose > 1; |
1282 | warn "AnyEvent: autoloaded model '$model', using it.\n" if $VERBOSE >= 2; |
1153 | last; |
1283 | last; |
1154 | } |
1284 | } |
1155 | } |
1285 | } |
1156 | |
1286 | |
1157 | $MODEL |
1287 | $MODEL |
… | |
… | |
1173 | |
1303 | |
1174 | sub AUTOLOAD { |
1304 | sub AUTOLOAD { |
1175 | (my $func = $AUTOLOAD) =~ s/.*://; |
1305 | (my $func = $AUTOLOAD) =~ s/.*://; |
1176 | |
1306 | |
1177 | $method{$func} |
1307 | $method{$func} |
1178 | or croak "$func: not a valid method for AnyEvent objects"; |
1308 | or Carp::croak "$func: not a valid method for AnyEvent objects"; |
1179 | |
1309 | |
1180 | detect unless $MODEL; |
1310 | detect unless $MODEL; |
1181 | |
1311 | |
1182 | my $class = shift; |
1312 | my $class = shift; |
1183 | $class->$func (@_); |
1313 | $class->$func (@_); |
… | |
… | |
1188 | # allow only one watcher per fd, so we dup it to get a different one). |
1318 | # allow only one watcher per fd, so we dup it to get a different one). |
1189 | sub _dupfh($$;$$) { |
1319 | sub _dupfh($$;$$) { |
1190 | my ($poll, $fh, $r, $w) = @_; |
1320 | my ($poll, $fh, $r, $w) = @_; |
1191 | |
1321 | |
1192 | # cygwin requires the fh mode to be matching, unix doesn't |
1322 | # cygwin requires the fh mode to be matching, unix doesn't |
1193 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") : ($w, ">"); |
1323 | my ($rw, $mode) = $poll eq "r" ? ($r, "<&") : ($w, ">&"); |
1194 | |
1324 | |
1195 | open my $fh2, "$mode&", $fh |
1325 | open my $fh2, $mode, $fh |
1196 | or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,"; |
1326 | or die "AnyEvent->io: cannot dup() filehandle in mode '$poll': $!,"; |
1197 | |
1327 | |
1198 | # we assume CLOEXEC is already set by perl in all important cases |
1328 | # we assume CLOEXEC is already set by perl in all important cases |
1199 | |
1329 | |
1200 | ($fh2, $rw) |
1330 | ($fh2, $rw) |
1201 | } |
1331 | } |
1202 | |
1332 | |
|
|
1333 | =head1 SIMPLIFIED AE API |
|
|
1334 | |
|
|
1335 | Starting with version 5.0, AnyEvent officially supports a second, much |
|
|
1336 | simpler, API that is designed to reduce the calling, typing and memory |
|
|
1337 | overhead. |
|
|
1338 | |
|
|
1339 | See the L<AE> manpage for details. |
|
|
1340 | |
|
|
1341 | =cut |
|
|
1342 | |
|
|
1343 | package AE; |
|
|
1344 | |
|
|
1345 | our $VERSION = $AnyEvent::VERSION; |
|
|
1346 | |
|
|
1347 | sub io($$$) { |
|
|
1348 | AnyEvent->io (fh => $_[0], poll => $_[1] ? "w" : "r", cb => $_[2]) |
|
|
1349 | } |
|
|
1350 | |
|
|
1351 | sub timer($$$) { |
|
|
1352 | AnyEvent->timer (after => $_[0], interval => $_[1], cb => $_[2]) |
|
|
1353 | } |
|
|
1354 | |
|
|
1355 | sub signal($$) { |
|
|
1356 | AnyEvent->signal (signal => $_[0], cb => $_[1]) |
|
|
1357 | } |
|
|
1358 | |
|
|
1359 | sub child($$) { |
|
|
1360 | AnyEvent->child (pid => $_[0], cb => $_[1]) |
|
|
1361 | } |
|
|
1362 | |
|
|
1363 | sub idle($) { |
|
|
1364 | AnyEvent->idle (cb => $_[0]) |
|
|
1365 | } |
|
|
1366 | |
|
|
1367 | sub cv(;&) { |
|
|
1368 | AnyEvent->condvar (@_ ? (cb => $_[0]) : ()) |
|
|
1369 | } |
|
|
1370 | |
|
|
1371 | sub now() { |
|
|
1372 | AnyEvent->now |
|
|
1373 | } |
|
|
1374 | |
|
|
1375 | sub now_update() { |
|
|
1376 | AnyEvent->now_update |
|
|
1377 | } |
|
|
1378 | |
|
|
1379 | sub time() { |
|
|
1380 | AnyEvent->time |
|
|
1381 | } |
|
|
1382 | |
1203 | package AnyEvent::Base; |
1383 | package AnyEvent::Base; |
1204 | |
1384 | |
1205 | # default implementations for many methods |
1385 | # default implementations for many methods |
1206 | |
1386 | |
1207 | BEGIN { |
1387 | sub _time() { |
|
|
1388 | # probe for availability of Time::HiRes |
1208 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
1389 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
|
|
1390 | warn "AnyEvent: using Time::HiRes for sub-second timing accuracy.\n" if $VERBOSE >= 8; |
1209 | *_time = \&Time::HiRes::time; |
1391 | *_time = \&Time::HiRes::time; |
1210 | # if (eval "use POSIX (); (POSIX::times())... |
1392 | # if (eval "use POSIX (); (POSIX::times())... |
1211 | } else { |
1393 | } else { |
|
|
1394 | warn "AnyEvent: using built-in time(), WARNING, no sub-second resolution!\n" if $VERBOSE; |
1212 | *_time = sub { time }; # epic fail |
1395 | *_time = sub (){ time }; # epic fail |
1213 | } |
1396 | } |
|
|
1397 | |
|
|
1398 | &_time |
1214 | } |
1399 | } |
1215 | |
1400 | |
1216 | sub time { _time } |
1401 | sub time { _time } |
1217 | sub now { _time } |
1402 | sub now { _time } |
1218 | sub now_update { } |
1403 | sub now_update { } |
… | |
… | |
1223 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
1408 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
1224 | } |
1409 | } |
1225 | |
1410 | |
1226 | # default implementation for ->signal |
1411 | # default implementation for ->signal |
1227 | |
1412 | |
|
|
1413 | our $HAVE_ASYNC_INTERRUPT; |
|
|
1414 | |
|
|
1415 | sub _have_async_interrupt() { |
|
|
1416 | $HAVE_ASYNC_INTERRUPT = 1*(!$ENV{PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT} |
|
|
1417 | && eval "use Async::Interrupt 1.02 (); 1") |
|
|
1418 | unless defined $HAVE_ASYNC_INTERRUPT; |
|
|
1419 | |
|
|
1420 | $HAVE_ASYNC_INTERRUPT |
|
|
1421 | } |
|
|
1422 | |
1228 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
1423 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
|
|
1424 | our (%SIG_ASY, %SIG_ASY_W); |
|
|
1425 | our ($SIG_COUNT, $SIG_TW); |
1229 | |
1426 | |
1230 | sub _signal_exec { |
1427 | sub _signal_exec { |
|
|
1428 | $HAVE_ASYNC_INTERRUPT |
|
|
1429 | ? $SIGPIPE_R->drain |
1231 | sysread $SIGPIPE_R, my $dummy, 4; |
1430 | : sysread $SIGPIPE_R, (my $dummy), 9; |
1232 | |
1431 | |
1233 | while (%SIG_EV) { |
1432 | while (%SIG_EV) { |
1234 | for (keys %SIG_EV) { |
1433 | for (keys %SIG_EV) { |
1235 | delete $SIG_EV{$_}; |
1434 | delete $SIG_EV{$_}; |
1236 | $_->() for values %{ $SIG_CB{$_} || {} }; |
1435 | $_->() for values %{ $SIG_CB{$_} || {} }; |
1237 | } |
1436 | } |
1238 | } |
1437 | } |
1239 | } |
1438 | } |
1240 | |
1439 | |
|
|
1440 | # install a dummy wakeup watcher to reduce signal catching latency |
|
|
1441 | sub _sig_add() { |
|
|
1442 | unless ($SIG_COUNT++) { |
|
|
1443 | # try to align timer on a full-second boundary, if possible |
|
|
1444 | my $NOW = AE::now; |
|
|
1445 | |
|
|
1446 | $SIG_TW = AE::timer |
|
|
1447 | $MAX_SIGNAL_LATENCY - ($NOW - int $NOW), |
|
|
1448 | $MAX_SIGNAL_LATENCY, |
|
|
1449 | sub { } # just for the PERL_ASYNC_CHECK |
|
|
1450 | ; |
|
|
1451 | } |
|
|
1452 | } |
|
|
1453 | |
|
|
1454 | sub _sig_del { |
|
|
1455 | undef $SIG_TW |
|
|
1456 | unless --$SIG_COUNT; |
|
|
1457 | } |
|
|
1458 | |
|
|
1459 | our $_sig_name_init; $_sig_name_init = sub { |
|
|
1460 | eval q{ # poor man's autoloading |
|
|
1461 | undef $_sig_name_init; |
|
|
1462 | |
|
|
1463 | if (_have_async_interrupt) { |
|
|
1464 | *sig2num = \&Async::Interrupt::sig2num; |
|
|
1465 | *sig2name = \&Async::Interrupt::sig2name; |
|
|
1466 | } else { |
|
|
1467 | require Config; |
|
|
1468 | |
|
|
1469 | my %signame2num; |
|
|
1470 | @signame2num{ split ' ', $Config::Config{sig_name} } |
|
|
1471 | = split ' ', $Config::Config{sig_num}; |
|
|
1472 | |
|
|
1473 | my @signum2name; |
|
|
1474 | @signum2name[values %signame2num] = keys %signame2num; |
|
|
1475 | |
|
|
1476 | *sig2num = sub($) { |
|
|
1477 | $_[0] > 0 ? shift : $signame2num{+shift} |
|
|
1478 | }; |
|
|
1479 | *sig2name = sub ($) { |
|
|
1480 | $_[0] > 0 ? $signum2name[+shift] : shift |
|
|
1481 | }; |
|
|
1482 | } |
|
|
1483 | }; |
|
|
1484 | die if $@; |
|
|
1485 | }; |
|
|
1486 | |
|
|
1487 | sub sig2num ($) { &$_sig_name_init; &sig2num } |
|
|
1488 | sub sig2name($) { &$_sig_name_init; &sig2name } |
|
|
1489 | |
1241 | sub signal { |
1490 | sub signal { |
1242 | my (undef, %arg) = @_; |
1491 | eval q{ # poor man's autoloading {} |
|
|
1492 | # probe for availability of Async::Interrupt |
|
|
1493 | if (_have_async_interrupt) { |
|
|
1494 | warn "AnyEvent: using Async::Interrupt for race-free signal handling.\n" if $VERBOSE >= 8; |
1243 | |
1495 | |
1244 | unless ($SIGPIPE_R) { |
1496 | $SIGPIPE_R = new Async::Interrupt::EventPipe; |
1245 | require Fcntl; |
1497 | $SIG_IO = AE::io $SIGPIPE_R->fileno, 0, \&_signal_exec; |
1246 | |
1498 | |
1247 | if (AnyEvent::WIN32) { |
|
|
1248 | require AnyEvent::Util; |
|
|
1249 | |
|
|
1250 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
|
|
1251 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R; |
|
|
1252 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case |
|
|
1253 | } else { |
1499 | } else { |
|
|
1500 | warn "AnyEvent: using emulated perl signal handling with latency timer.\n" if $VERBOSE >= 8; |
|
|
1501 | |
|
|
1502 | require Fcntl; |
|
|
1503 | |
|
|
1504 | if (AnyEvent::WIN32) { |
|
|
1505 | require AnyEvent::Util; |
|
|
1506 | |
|
|
1507 | ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe (); |
|
|
1508 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_R, 1) if $SIGPIPE_R; |
|
|
1509 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W, 1) if $SIGPIPE_W; # just in case |
|
|
1510 | } else { |
1254 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1511 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1255 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1512 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1256 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1513 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1257 | |
1514 | |
1258 | # not strictly required, as $^F is normally 2, but let's make sure... |
1515 | # not strictly required, as $^F is normally 2, but let's make sure... |
1259 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1516 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1260 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1517 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
|
|
1518 | } |
|
|
1519 | |
|
|
1520 | $SIGPIPE_R |
|
|
1521 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
|
|
1522 | |
|
|
1523 | $SIG_IO = AE::io $SIGPIPE_R, 0, \&_signal_exec; |
1261 | } |
1524 | } |
1262 | |
1525 | |
1263 | $SIGPIPE_R |
1526 | *signal = sub { |
1264 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1527 | my (undef, %arg) = @_; |
1265 | |
1528 | |
1266 | $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec); |
|
|
1267 | } |
|
|
1268 | |
|
|
1269 | my $signal = uc $arg{signal} |
1529 | my $signal = uc $arg{signal} |
1270 | or Carp::croak "required option 'signal' is missing"; |
1530 | or Carp::croak "required option 'signal' is missing"; |
1271 | |
1531 | |
|
|
1532 | if ($HAVE_ASYNC_INTERRUPT) { |
|
|
1533 | # async::interrupt |
|
|
1534 | |
|
|
1535 | $signal = sig2num $signal; |
1272 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
1536 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
|
|
1537 | |
|
|
1538 | $SIG_ASY{$signal} ||= new Async::Interrupt |
|
|
1539 | cb => sub { undef $SIG_EV{$signal} }, |
|
|
1540 | signal => $signal, |
|
|
1541 | pipe => [$SIGPIPE_R->filenos], |
|
|
1542 | pipe_autodrain => 0, |
|
|
1543 | ; |
|
|
1544 | |
|
|
1545 | } else { |
|
|
1546 | # pure perl |
|
|
1547 | |
|
|
1548 | # AE::Util has been loaded in signal |
|
|
1549 | $signal = sig2name $signal; |
|
|
1550 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
|
|
1551 | |
1273 | $SIG{$signal} ||= sub { |
1552 | $SIG{$signal} ||= sub { |
1274 | local $!; |
1553 | local $!; |
1275 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1554 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1276 | undef $SIG_EV{$signal}; |
1555 | undef $SIG_EV{$signal}; |
|
|
1556 | }; |
|
|
1557 | |
|
|
1558 | # can't do signal processing without introducing races in pure perl, |
|
|
1559 | # so limit the signal latency. |
|
|
1560 | _sig_add; |
|
|
1561 | } |
|
|
1562 | |
|
|
1563 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
|
|
1564 | }; |
|
|
1565 | |
|
|
1566 | *AnyEvent::Base::signal::DESTROY = sub { |
|
|
1567 | my ($signal, $cb) = @{$_[0]}; |
|
|
1568 | |
|
|
1569 | _sig_del; |
|
|
1570 | |
|
|
1571 | delete $SIG_CB{$signal}{$cb}; |
|
|
1572 | |
|
|
1573 | $HAVE_ASYNC_INTERRUPT |
|
|
1574 | ? delete $SIG_ASY{$signal} |
|
|
1575 | : # delete doesn't work with older perls - they then |
|
|
1576 | # print weird messages, or just unconditionally exit |
|
|
1577 | # instead of getting the default action. |
|
|
1578 | undef $SIG{$signal} |
|
|
1579 | unless keys %{ $SIG_CB{$signal} }; |
|
|
1580 | }; |
1277 | }; |
1581 | }; |
1278 | |
1582 | die if $@; |
1279 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
1583 | &signal |
1280 | } |
|
|
1281 | |
|
|
1282 | sub AnyEvent::Base::signal::DESTROY { |
|
|
1283 | my ($signal, $cb) = @{$_[0]}; |
|
|
1284 | |
|
|
1285 | delete $SIG_CB{$signal}{$cb}; |
|
|
1286 | |
|
|
1287 | # delete doesn't work with older perls - they then |
|
|
1288 | # print weird messages, or just unconditionally exit |
|
|
1289 | # instead of getting the default action. |
|
|
1290 | undef $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
|
|
1291 | } |
1584 | } |
1292 | |
1585 | |
1293 | # default implementation for ->child |
1586 | # default implementation for ->child |
1294 | |
1587 | |
1295 | our %PID_CB; |
1588 | our %PID_CB; |
1296 | our $CHLD_W; |
1589 | our $CHLD_W; |
1297 | our $CHLD_DELAY_W; |
1590 | our $CHLD_DELAY_W; |
1298 | our $WNOHANG; |
1591 | our $WNOHANG; |
1299 | |
1592 | |
|
|
1593 | sub _emit_childstatus($$) { |
|
|
1594 | my (undef, $rpid, $rstatus) = @_; |
|
|
1595 | |
|
|
1596 | $_->($rpid, $rstatus) |
|
|
1597 | for values %{ $PID_CB{$rpid} || {} }, |
|
|
1598 | values %{ $PID_CB{0} || {} }; |
|
|
1599 | } |
|
|
1600 | |
1300 | sub _sigchld { |
1601 | sub _sigchld { |
|
|
1602 | my $pid; |
|
|
1603 | |
|
|
1604 | AnyEvent->_emit_childstatus ($pid, $?) |
1301 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
1605 | while ($pid = waitpid -1, $WNOHANG) > 0; |
1302 | $_->($pid, $?) for (values %{ $PID_CB{$pid} || {} }), |
|
|
1303 | (values %{ $PID_CB{0} || {} }); |
|
|
1304 | } |
|
|
1305 | } |
1606 | } |
1306 | |
1607 | |
1307 | sub child { |
1608 | sub child { |
1308 | my (undef, %arg) = @_; |
1609 | my (undef, %arg) = @_; |
1309 | |
1610 | |
1310 | defined (my $pid = $arg{pid} + 0) |
1611 | defined (my $pid = $arg{pid} + 0) |
1311 | or Carp::croak "required option 'pid' is missing"; |
1612 | or Carp::croak "required option 'pid' is missing"; |
1312 | |
1613 | |
1313 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1614 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1314 | |
1615 | |
|
|
1616 | # WNOHANG is almost cetrainly 1 everywhere |
|
|
1617 | $WNOHANG ||= $^O =~ /^(?:openbsd|netbsd|linux|freebsd|cygwin|MSWin32)$/ |
|
|
1618 | ? 1 |
1315 | $WNOHANG ||= eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1619 | : eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1316 | |
1620 | |
1317 | unless ($CHLD_W) { |
1621 | unless ($CHLD_W) { |
1318 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1622 | $CHLD_W = AE::signal CHLD => \&_sigchld; |
1319 | # child could be a zombie already, so make at least one round |
1623 | # child could be a zombie already, so make at least one round |
1320 | &_sigchld; |
1624 | &_sigchld; |
1321 | } |
1625 | } |
1322 | |
1626 | |
1323 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
1627 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
… | |
… | |
1349 | # never use more then 50% of the time for the idle watcher, |
1653 | # never use more then 50% of the time for the idle watcher, |
1350 | # within some limits |
1654 | # within some limits |
1351 | $w = 0.0001 if $w < 0.0001; |
1655 | $w = 0.0001 if $w < 0.0001; |
1352 | $w = 5 if $w > 5; |
1656 | $w = 5 if $w > 5; |
1353 | |
1657 | |
1354 | $w = AnyEvent->timer (after => $w, cb => $rcb); |
1658 | $w = AE::timer $w, 0, $rcb; |
1355 | } else { |
1659 | } else { |
1356 | # clean up... |
1660 | # clean up... |
1357 | undef $w; |
1661 | undef $w; |
1358 | undef $rcb; |
1662 | undef $rcb; |
1359 | } |
1663 | } |
1360 | }; |
1664 | }; |
1361 | |
1665 | |
1362 | $w = AnyEvent->timer (after => 0.05, cb => $rcb); |
1666 | $w = AE::timer 0.05, 0, $rcb; |
1363 | |
1667 | |
1364 | bless \\$cb, "AnyEvent::Base::idle" |
1668 | bless \\$cb, "AnyEvent::Base::idle" |
1365 | } |
1669 | } |
1366 | |
1670 | |
1367 | sub AnyEvent::Base::idle::DESTROY { |
1671 | sub AnyEvent::Base::idle::DESTROY { |
… | |
… | |
1372 | |
1676 | |
1373 | our @ISA = AnyEvent::CondVar::Base::; |
1677 | our @ISA = AnyEvent::CondVar::Base::; |
1374 | |
1678 | |
1375 | package AnyEvent::CondVar::Base; |
1679 | package AnyEvent::CondVar::Base; |
1376 | |
1680 | |
1377 | use overload |
1681 | #use overload |
1378 | '&{}' => sub { my $self = shift; sub { $self->send (@_) } }, |
1682 | # '&{}' => sub { my $self = shift; sub { $self->send (@_) } }, |
1379 | fallback => 1; |
1683 | # fallback => 1; |
|
|
1684 | |
|
|
1685 | # save 300+ kilobytes by dirtily hardcoding overloading |
|
|
1686 | ${"AnyEvent::CondVar::Base::OVERLOAD"}{dummy}++; # Register with magic by touching. |
|
|
1687 | *{'AnyEvent::CondVar::Base::()'} = sub { }; # "Make it findable via fetchmethod." |
|
|
1688 | *{'AnyEvent::CondVar::Base::(&{}'} = sub { my $self = shift; sub { $self->send (@_) } }; # &{} |
|
|
1689 | ${'AnyEvent::CondVar::Base::()'} = 1; # fallback |
|
|
1690 | |
|
|
1691 | our $WAITING; |
1380 | |
1692 | |
1381 | sub _send { |
1693 | sub _send { |
1382 | # nop |
1694 | # nop |
1383 | } |
1695 | } |
1384 | |
1696 | |
… | |
… | |
1397 | sub ready { |
1709 | sub ready { |
1398 | $_[0]{_ae_sent} |
1710 | $_[0]{_ae_sent} |
1399 | } |
1711 | } |
1400 | |
1712 | |
1401 | sub _wait { |
1713 | sub _wait { |
|
|
1714 | $WAITING |
|
|
1715 | and !$_[0]{_ae_sent} |
|
|
1716 | and Carp::croak "AnyEvent::CondVar: recursive blocking wait detected"; |
|
|
1717 | |
|
|
1718 | local $WAITING = 1; |
1402 | AnyEvent->one_event while !$_[0]{_ae_sent}; |
1719 | AnyEvent->one_event while !$_[0]{_ae_sent}; |
1403 | } |
1720 | } |
1404 | |
1721 | |
1405 | sub recv { |
1722 | sub recv { |
1406 | $_[0]->_wait; |
1723 | $_[0]->_wait; |
… | |
… | |
1408 | Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak}; |
1725 | Carp::croak $_[0]{_ae_croak} if $_[0]{_ae_croak}; |
1409 | wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0] |
1726 | wantarray ? @{ $_[0]{_ae_sent} } : $_[0]{_ae_sent}[0] |
1410 | } |
1727 | } |
1411 | |
1728 | |
1412 | sub cb { |
1729 | sub cb { |
1413 | $_[0]{_ae_cb} = $_[1] if @_ > 1; |
1730 | my $cv = shift; |
|
|
1731 | |
|
|
1732 | @_ |
|
|
1733 | and $cv->{_ae_cb} = shift |
|
|
1734 | and $cv->{_ae_sent} |
|
|
1735 | and (delete $cv->{_ae_cb})->($cv); |
|
|
1736 | |
1414 | $_[0]{_ae_cb} |
1737 | $cv->{_ae_cb} |
1415 | } |
1738 | } |
1416 | |
1739 | |
1417 | sub begin { |
1740 | sub begin { |
1418 | ++$_[0]{_ae_counter}; |
1741 | ++$_[0]{_ae_counter}; |
1419 | $_[0]{_ae_end_cb} = $_[1] if @_ > 1; |
1742 | $_[0]{_ae_end_cb} = $_[1] if @_ > 1; |
… | |
… | |
1468 | C<PERL_ANYEVENT_MODEL>. |
1791 | C<PERL_ANYEVENT_MODEL>. |
1469 | |
1792 | |
1470 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
1793 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
1471 | model it chooses. |
1794 | model it chooses. |
1472 | |
1795 | |
|
|
1796 | When set to C<8> or higher, then AnyEvent will report extra information on |
|
|
1797 | which optional modules it loads and how it implements certain features. |
|
|
1798 | |
1473 | =item C<PERL_ANYEVENT_STRICT> |
1799 | =item C<PERL_ANYEVENT_STRICT> |
1474 | |
1800 | |
1475 | AnyEvent does not do much argument checking by default, as thorough |
1801 | AnyEvent does not do much argument checking by default, as thorough |
1476 | argument checking is very costly. Setting this variable to a true value |
1802 | argument checking is very costly. Setting this variable to a true value |
1477 | will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly |
1803 | will cause AnyEvent to load C<AnyEvent::Strict> and then to thoroughly |
1478 | check the arguments passed to most method calls. If it finds any problems, |
1804 | check the arguments passed to most method calls. If it finds any problems, |
1479 | it will croak. |
1805 | it will croak. |
1480 | |
1806 | |
1481 | In other words, enables "strict" mode. |
1807 | In other words, enables "strict" mode. |
1482 | |
1808 | |
1483 | Unlike C<use strict>, it is definitely recommended to keep it off in |
1809 | Unlike C<use strict> (or it's modern cousin, C<< use L<common::sense> |
1484 | production. Keeping C<PERL_ANYEVENT_STRICT=1> in your environment while |
1810 | >>, it is definitely recommended to keep it off in production. Keeping |
1485 | developing programs can be very useful, however. |
1811 | C<PERL_ANYEVENT_STRICT=1> in your environment while developing programs |
|
|
1812 | can be very useful, however. |
1486 | |
1813 | |
1487 | =item C<PERL_ANYEVENT_MODEL> |
1814 | =item C<PERL_ANYEVENT_MODEL> |
1488 | |
1815 | |
1489 | This can be used to specify the event model to be used by AnyEvent, before |
1816 | This can be used to specify the event model to be used by AnyEvent, before |
1490 | auto detection and -probing kicks in. It must be a string consisting |
1817 | auto detection and -probing kicks in. It must be a string consisting |
… | |
… | |
1552 | |
1879 | |
1553 | When neither C<ca_file> nor C<ca_path> was specified during |
1880 | When neither C<ca_file> nor C<ca_path> was specified during |
1554 | L<AnyEvent::TLS> context creation, and either of these environment |
1881 | L<AnyEvent::TLS> context creation, and either of these environment |
1555 | variables exist, they will be used to specify CA certificate locations |
1882 | variables exist, they will be used to specify CA certificate locations |
1556 | instead of a system-dependent default. |
1883 | instead of a system-dependent default. |
|
|
1884 | |
|
|
1885 | =item C<PERL_ANYEVENT_AVOID_GUARD> and C<PERL_ANYEVENT_AVOID_ASYNC_INTERRUPT> |
|
|
1886 | |
|
|
1887 | When these are set to C<1>, then the respective modules are not |
|
|
1888 | loaded. Mostly good for testing AnyEvent itself. |
1557 | |
1889 | |
1558 | =back |
1890 | =back |
1559 | |
1891 | |
1560 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
1892 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
1561 | |
1893 | |
… | |
… | |
1619 | warn "read: $input\n"; # output what has been read |
1951 | warn "read: $input\n"; # output what has been read |
1620 | $cv->send if $input =~ /^q/i; # quit program if /^q/i |
1952 | $cv->send if $input =~ /^q/i; # quit program if /^q/i |
1621 | }, |
1953 | }, |
1622 | ); |
1954 | ); |
1623 | |
1955 | |
1624 | my $time_watcher; # can only be used once |
|
|
1625 | |
|
|
1626 | sub new_timer { |
|
|
1627 | $timer = AnyEvent->timer (after => 1, cb => sub { |
1956 | my $time_watcher = AnyEvent->timer (after => 1, interval => 1, cb => sub { |
1628 | warn "timeout\n"; # print 'timeout' about every second |
1957 | warn "timeout\n"; # print 'timeout' at most every second |
1629 | &new_timer; # and restart the time |
|
|
1630 | }); |
1958 | }); |
1631 | } |
|
|
1632 | |
|
|
1633 | new_timer; # create first timer |
|
|
1634 | |
1959 | |
1635 | $cv->recv; # wait until user enters /^q/i |
1960 | $cv->recv; # wait until user enters /^q/i |
1636 | |
1961 | |
1637 | =head1 REAL-WORLD EXAMPLE |
1962 | =head1 REAL-WORLD EXAMPLE |
1638 | |
1963 | |
… | |
… | |
1769 | through AnyEvent. The benchmark creates a lot of timers (with a zero |
2094 | through AnyEvent. The benchmark creates a lot of timers (with a zero |
1770 | timeout) and I/O watchers (watching STDOUT, a pty, to become writable, |
2095 | timeout) and I/O watchers (watching STDOUT, a pty, to become writable, |
1771 | which it is), lets them fire exactly once and destroys them again. |
2096 | which it is), lets them fire exactly once and destroys them again. |
1772 | |
2097 | |
1773 | Source code for this benchmark is found as F<eg/bench> in the AnyEvent |
2098 | Source code for this benchmark is found as F<eg/bench> in the AnyEvent |
1774 | distribution. |
2099 | distribution. It uses the L<AE> interface, which makes a real difference |
|
|
2100 | for the EV and Perl backends only. |
1775 | |
2101 | |
1776 | =head3 Explanation of the columns |
2102 | =head3 Explanation of the columns |
1777 | |
2103 | |
1778 | I<watcher> is the number of event watchers created/destroyed. Since |
2104 | I<watcher> is the number of event watchers created/destroyed. Since |
1779 | different event models feature vastly different performances, each event |
2105 | different event models feature vastly different performances, each event |
… | |
… | |
1800 | watcher. |
2126 | watcher. |
1801 | |
2127 | |
1802 | =head3 Results |
2128 | =head3 Results |
1803 | |
2129 | |
1804 | name watchers bytes create invoke destroy comment |
2130 | name watchers bytes create invoke destroy comment |
1805 | EV/EV 400000 224 0.47 0.35 0.27 EV native interface |
2131 | EV/EV 100000 223 0.47 0.43 0.27 EV native interface |
1806 | EV/Any 100000 224 2.88 0.34 0.27 EV + AnyEvent watchers |
2132 | EV/Any 100000 223 0.48 0.42 0.26 EV + AnyEvent watchers |
1807 | CoroEV/Any 100000 224 2.85 0.35 0.28 coroutines + Coro::Signal |
2133 | Coro::EV/Any 100000 223 0.47 0.42 0.26 coroutines + Coro::Signal |
1808 | Perl/Any 100000 452 4.13 0.73 0.95 pure perl implementation |
2134 | Perl/Any 100000 431 2.70 0.74 0.92 pure perl implementation |
1809 | Event/Event 16000 517 32.20 31.80 0.81 Event native interface |
2135 | Event/Event 16000 516 31.16 31.84 0.82 Event native interface |
1810 | Event/Any 16000 590 35.85 31.55 1.06 Event + AnyEvent watchers |
2136 | Event/Any 16000 1203 42.61 34.79 1.80 Event + AnyEvent watchers |
1811 | IOAsync/Any 16000 989 38.10 32.77 11.13 via IO::Async::Loop::IO_Poll |
2137 | IOAsync/Any 16000 1911 41.92 27.45 16.81 via IO::Async::Loop::IO_Poll |
1812 | IOAsync/Any 16000 990 37.59 29.50 10.61 via IO::Async::Loop::Epoll |
2138 | IOAsync/Any 16000 1726 40.69 26.37 15.25 via IO::Async::Loop::Epoll |
1813 | Glib/Any 16000 1357 102.33 12.31 51.00 quadratic behaviour |
2139 | Glib/Any 16000 1118 89.00 12.57 51.17 quadratic behaviour |
1814 | Tk/Any 2000 1860 27.20 66.31 14.00 SEGV with >> 2000 watchers |
2140 | Tk/Any 2000 1346 20.96 10.75 8.00 SEGV with >> 2000 watchers |
1815 | POE/Event 2000 6328 109.99 751.67 14.02 via POE::Loop::Event |
2141 | POE/Any 2000 6951 108.97 795.32 14.24 via POE::Loop::Event |
1816 | POE/Select 2000 6027 94.54 809.13 579.80 via POE::Loop::Select |
2142 | POE/Any 2000 6648 94.79 774.40 575.51 via POE::Loop::Select |
1817 | |
2143 | |
1818 | =head3 Discussion |
2144 | =head3 Discussion |
1819 | |
2145 | |
1820 | The benchmark does I<not> measure scalability of the event loop very |
2146 | The benchmark does I<not> measure scalability of the event loop very |
1821 | well. For example, a select-based event loop (such as the pure perl one) |
2147 | well. For example, a select-based event loop (such as the pure perl one) |
… | |
… | |
1833 | benchmark machine, handling an event takes roughly 1600 CPU cycles with |
2159 | benchmark machine, handling an event takes roughly 1600 CPU cycles with |
1834 | EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU |
2160 | EV, 3100 CPU cycles with AnyEvent's pure perl loop and almost 3000000 CPU |
1835 | cycles with POE. |
2161 | cycles with POE. |
1836 | |
2162 | |
1837 | C<EV> is the sole leader regarding speed and memory use, which are both |
2163 | C<EV> is the sole leader regarding speed and memory use, which are both |
1838 | maximal/minimal, respectively. Even when going through AnyEvent, it uses |
2164 | maximal/minimal, respectively. When using the L<AE> API there is zero |
|
|
2165 | overhead (when going through the AnyEvent API create is about 5-6 times |
|
|
2166 | slower, with other times being equal, so still uses far less memory than |
1839 | far less memory than any other event loop and is still faster than Event |
2167 | any other event loop and is still faster than Event natively). |
1840 | natively. |
|
|
1841 | |
2168 | |
1842 | The pure perl implementation is hit in a few sweet spots (both the |
2169 | The pure perl implementation is hit in a few sweet spots (both the |
1843 | constant timeout and the use of a single fd hit optimisations in the perl |
2170 | constant timeout and the use of a single fd hit optimisations in the perl |
1844 | interpreter and the backend itself). Nevertheless this shows that it |
2171 | interpreter and the backend itself). Nevertheless this shows that it |
1845 | adds very little overhead in itself. Like any select-based backend its |
2172 | adds very little overhead in itself. Like any select-based backend its |
… | |
… | |
1919 | In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100 |
2246 | In this benchmark, we use 10000 socket pairs (20000 sockets), of which 100 |
1920 | (1%) are active. This mirrors the activity of large servers with many |
2247 | (1%) are active. This mirrors the activity of large servers with many |
1921 | connections, most of which are idle at any one point in time. |
2248 | connections, most of which are idle at any one point in time. |
1922 | |
2249 | |
1923 | Source code for this benchmark is found as F<eg/bench2> in the AnyEvent |
2250 | Source code for this benchmark is found as F<eg/bench2> in the AnyEvent |
1924 | distribution. |
2251 | distribution. It uses the L<AE> interface, which makes a real difference |
|
|
2252 | for the EV and Perl backends only. |
1925 | |
2253 | |
1926 | =head3 Explanation of the columns |
2254 | =head3 Explanation of the columns |
1927 | |
2255 | |
1928 | I<sockets> is the number of sockets, and twice the number of "servers" (as |
2256 | I<sockets> is the number of sockets, and twice the number of "servers" (as |
1929 | each server has a read and write socket end). |
2257 | each server has a read and write socket end). |
… | |
… | |
1937 | a new one that moves the timeout into the future. |
2265 | a new one that moves the timeout into the future. |
1938 | |
2266 | |
1939 | =head3 Results |
2267 | =head3 Results |
1940 | |
2268 | |
1941 | name sockets create request |
2269 | name sockets create request |
1942 | EV 20000 69.01 11.16 |
2270 | EV 20000 62.66 7.99 |
1943 | Perl 20000 73.32 35.87 |
2271 | Perl 20000 68.32 32.64 |
1944 | IOAsync 20000 157.00 98.14 epoll |
2272 | IOAsync 20000 174.06 101.15 epoll |
1945 | IOAsync 20000 159.31 616.06 poll |
2273 | IOAsync 20000 174.67 610.84 poll |
1946 | Event 20000 212.62 257.32 |
2274 | Event 20000 202.69 242.91 |
1947 | Glib 20000 651.16 1896.30 |
2275 | Glib 20000 557.01 1689.52 |
1948 | POE 20000 349.67 12317.24 uses POE::Loop::Event |
2276 | POE 20000 341.54 12086.32 uses POE::Loop::Event |
1949 | |
2277 | |
1950 | =head3 Discussion |
2278 | =head3 Discussion |
1951 | |
2279 | |
1952 | This benchmark I<does> measure scalability and overall performance of the |
2280 | This benchmark I<does> measure scalability and overall performance of the |
1953 | particular event loop. |
2281 | particular event loop. |
… | |
… | |
2079 | As you can see, the AnyEvent + EV combination even beats the |
2407 | As you can see, the AnyEvent + EV combination even beats the |
2080 | hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl |
2408 | hand-optimised "raw sockets benchmark", while AnyEvent + its pure perl |
2081 | backend easily beats IO::Lambda and POE. |
2409 | backend easily beats IO::Lambda and POE. |
2082 | |
2410 | |
2083 | And even the 100% non-blocking version written using the high-level (and |
2411 | And even the 100% non-blocking version written using the high-level (and |
2084 | slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda by a |
2412 | slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda |
2085 | large margin, even though it does all of DNS, tcp-connect and socket I/O |
2413 | higher level ("unoptimised") abstractions by a large margin, even though |
2086 | in a non-blocking way. |
2414 | it does all of DNS, tcp-connect and socket I/O in a non-blocking way. |
2087 | |
2415 | |
2088 | The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and |
2416 | The two AnyEvent benchmarks programs can be found as F<eg/ae0.pl> and |
2089 | F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are |
2417 | F<eg/ae2.pl> in the AnyEvent distribution, the remaining benchmarks are |
2090 | part of the IO::lambda distribution and were used without any changes. |
2418 | part of the IO::Lambda distribution and were used without any changes. |
2091 | |
2419 | |
2092 | |
2420 | |
2093 | =head1 SIGNALS |
2421 | =head1 SIGNALS |
2094 | |
2422 | |
2095 | AnyEvent currently installs handlers for these signals: |
2423 | AnyEvent currently installs handlers for these signals: |
… | |
… | |
2100 | |
2428 | |
2101 | A handler for C<SIGCHLD> is installed by AnyEvent's child watcher |
2429 | A handler for C<SIGCHLD> is installed by AnyEvent's child watcher |
2102 | emulation for event loops that do not support them natively. Also, some |
2430 | emulation for event loops that do not support them natively. Also, some |
2103 | event loops install a similar handler. |
2431 | event loops install a similar handler. |
2104 | |
2432 | |
2105 | If, when AnyEvent is loaded, SIGCHLD is set to IGNORE, then AnyEvent will |
2433 | Additionally, when AnyEvent is loaded and SIGCHLD is set to IGNORE, then |
2106 | reset it to default, to avoid losing child exit statuses. |
2434 | AnyEvent will reset it to default, to avoid losing child exit statuses. |
2107 | |
2435 | |
2108 | =item SIGPIPE |
2436 | =item SIGPIPE |
2109 | |
2437 | |
2110 | A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef> |
2438 | A no-op handler is installed for C<SIGPIPE> when C<$SIG{PIPE}> is C<undef> |
2111 | when AnyEvent gets loaded. |
2439 | when AnyEvent gets loaded. |
… | |
… | |
2129 | if $SIG{CHLD} eq 'IGNORE'; |
2457 | if $SIG{CHLD} eq 'IGNORE'; |
2130 | |
2458 | |
2131 | $SIG{PIPE} = sub { } |
2459 | $SIG{PIPE} = sub { } |
2132 | unless defined $SIG{PIPE}; |
2460 | unless defined $SIG{PIPE}; |
2133 | |
2461 | |
|
|
2462 | =head1 RECOMMENDED/OPTIONAL MODULES |
|
|
2463 | |
|
|
2464 | One of AnyEvent's main goals is to be 100% Pure-Perl(tm): only perl (and |
|
|
2465 | it's built-in modules) are required to use it. |
|
|
2466 | |
|
|
2467 | That does not mean that AnyEvent won't take advantage of some additional |
|
|
2468 | modules if they are installed. |
|
|
2469 | |
|
|
2470 | This section explains which additional modules will be used, and how they |
|
|
2471 | affect AnyEvent's operation. |
|
|
2472 | |
|
|
2473 | =over 4 |
|
|
2474 | |
|
|
2475 | =item L<Async::Interrupt> |
|
|
2476 | |
|
|
2477 | This slightly arcane module is used to implement fast signal handling: To |
|
|
2478 | my knowledge, there is no way to do completely race-free and quick |
|
|
2479 | signal handling in pure perl. To ensure that signals still get |
|
|
2480 | delivered, AnyEvent will start an interval timer to wake up perl (and |
|
|
2481 | catch the signals) with some delay (default is 10 seconds, look for |
|
|
2482 | C<$AnyEvent::MAX_SIGNAL_LATENCY>). |
|
|
2483 | |
|
|
2484 | If this module is available, then it will be used to implement signal |
|
|
2485 | catching, which means that signals will not be delayed, and the event loop |
|
|
2486 | will not be interrupted regularly, which is more efficient (and good for |
|
|
2487 | battery life on laptops). |
|
|
2488 | |
|
|
2489 | This affects not just the pure-perl event loop, but also other event loops |
|
|
2490 | that have no signal handling on their own (e.g. Glib, Tk, Qt). |
|
|
2491 | |
|
|
2492 | Some event loops (POE, Event, Event::Lib) offer signal watchers natively, |
|
|
2493 | and either employ their own workarounds (POE) or use AnyEvent's workaround |
|
|
2494 | (using C<$AnyEvent::MAX_SIGNAL_LATENCY>). Installing L<Async::Interrupt> |
|
|
2495 | does nothing for those backends. |
|
|
2496 | |
|
|
2497 | =item L<EV> |
|
|
2498 | |
|
|
2499 | This module isn't really "optional", as it is simply one of the backend |
|
|
2500 | event loops that AnyEvent can use. However, it is simply the best event |
|
|
2501 | loop available in terms of features, speed and stability: It supports |
|
|
2502 | the AnyEvent API optimally, implements all the watcher types in XS, does |
|
|
2503 | automatic timer adjustments even when no monotonic clock is available, |
|
|
2504 | can take avdantage of advanced kernel interfaces such as C<epoll> and |
|
|
2505 | C<kqueue>, and is the fastest backend I<by far>. You can even embed |
|
|
2506 | L<Glib>/L<Gtk2> in it (or vice versa, see L<EV::Glib> and L<Glib::EV>). |
|
|
2507 | |
|
|
2508 | =item L<Guard> |
|
|
2509 | |
|
|
2510 | The guard module, when used, will be used to implement |
|
|
2511 | C<AnyEvent::Util::guard>. This speeds up guards considerably (and uses a |
|
|
2512 | lot less memory), but otherwise doesn't affect guard operation much. It is |
|
|
2513 | purely used for performance. |
|
|
2514 | |
|
|
2515 | =item L<JSON> and L<JSON::XS> |
|
|
2516 | |
|
|
2517 | One of these modules is required when you want to read or write JSON data |
|
|
2518 | via L<AnyEvent::Handle>. It is also written in pure-perl, but can take |
|
|
2519 | advantage of the ultra-high-speed L<JSON::XS> module when it is installed. |
|
|
2520 | |
|
|
2521 | In fact, L<AnyEvent::Handle> will use L<JSON::XS> by default if it is |
|
|
2522 | installed. |
|
|
2523 | |
|
|
2524 | =item L<Net::SSLeay> |
|
|
2525 | |
|
|
2526 | Implementing TLS/SSL in Perl is certainly interesting, but not very |
|
|
2527 | worthwhile: If this module is installed, then L<AnyEvent::Handle> (with |
|
|
2528 | the help of L<AnyEvent::TLS>), gains the ability to do TLS/SSL. |
|
|
2529 | |
|
|
2530 | =item L<Time::HiRes> |
|
|
2531 | |
|
|
2532 | This module is part of perl since release 5.008. It will be used when the |
|
|
2533 | chosen event library does not come with a timing source on it's own. The |
|
|
2534 | pure-perl event loop (L<AnyEvent::Impl::Perl>) will additionally use it to |
|
|
2535 | try to use a monotonic clock for timing stability. |
|
|
2536 | |
|
|
2537 | =back |
|
|
2538 | |
|
|
2539 | |
2134 | =head1 FORK |
2540 | =head1 FORK |
2135 | |
2541 | |
2136 | Most event libraries are not fork-safe. The ones who are usually are |
2542 | Most event libraries are not fork-safe. The ones who are usually are |
2137 | because they rely on inefficient but fork-safe C<select> or C<poll> |
2543 | because they rely on inefficient but fork-safe C<select> or C<poll> calls |
2138 | calls. Only L<EV> is fully fork-aware. |
2544 | - higher performance APIs such as BSD's kqueue or the dreaded Linux epoll |
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2545 | are usually badly thought-out hacks that are incompatible with fork in |
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2546 | one way or another. Only L<EV> is fully fork-aware and ensures that you |
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2547 | continue event-processing in both parent and child (or both, if you know |
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2548 | what you are doing). |
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2549 | |
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2550 | This means that, in general, you cannot fork and do event processing in |
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2551 | the child if the event library was initialised before the fork (which |
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2552 | usually happens when the first AnyEvent watcher is created, or the library |
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2553 | is loaded). |
2139 | |
2554 | |
2140 | If you have to fork, you must either do so I<before> creating your first |
2555 | If you have to fork, you must either do so I<before> creating your first |
2141 | watcher OR you must not use AnyEvent at all in the child. |
2556 | watcher OR you must not use AnyEvent at all in the child OR you must do |
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2557 | something completely out of the scope of AnyEvent. |
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2558 | |
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2559 | The problem of doing event processing in the parent I<and> the child |
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2560 | is much more complicated: even for backends that I<are> fork-aware or |
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2561 | fork-safe, their behaviour is not usually what you want: fork clones all |
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2562 | watchers, that means all timers, I/O watchers etc. are active in both |
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2563 | parent and child, which is almost never what you want. USing C<exec> |
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2564 | to start worker children from some kind of manage rprocess is usually |
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2565 | preferred, because it is much easier and cleaner, at the expense of having |
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2566 | to have another binary. |
2142 | |
2567 | |
2143 | |
2568 | |
2144 | =head1 SECURITY CONSIDERATIONS |
2569 | =head1 SECURITY CONSIDERATIONS |
2145 | |
2570 | |
2146 | AnyEvent can be forced to load any event model via |
2571 | AnyEvent can be forced to load any event model via |
… | |
… | |
2184 | L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. |
2609 | L<Glib>, L<Tk>, L<Event::Lib>, L<Qt>, L<POE>. |
2185 | |
2610 | |
2186 | Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, |
2611 | Implementations: L<AnyEvent::Impl::EV>, L<AnyEvent::Impl::Event>, |
2187 | L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, |
2612 | L<AnyEvent::Impl::Glib>, L<AnyEvent::Impl::Tk>, L<AnyEvent::Impl::Perl>, |
2188 | L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, |
2613 | L<AnyEvent::Impl::EventLib>, L<AnyEvent::Impl::Qt>, |
2189 | L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>. |
2614 | L<AnyEvent::Impl::POE>, L<AnyEvent::Impl::IOAsync>, L<Anyevent::Impl::Irssi>. |
2190 | |
2615 | |
2191 | Non-blocking file handles, sockets, TCP clients and |
2616 | Non-blocking file handles, sockets, TCP clients and |
2192 | servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>. |
2617 | servers: L<AnyEvent::Handle>, L<AnyEvent::Socket>, L<AnyEvent::TLS>. |
2193 | |
2618 | |
2194 | Asynchronous DNS: L<AnyEvent::DNS>. |
2619 | Asynchronous DNS: L<AnyEvent::DNS>. |