… | |
… | |
17 | }); |
17 | }); |
18 | |
18 | |
19 | my $w = AnyEvent->condvar; # stores wether a condition was flagged |
19 | my $w = AnyEvent->condvar; # stores wether a condition was flagged |
20 | $w->wait; # enters "main loop" till $condvar gets ->broadcast |
20 | $w->wait; # enters "main loop" till $condvar gets ->broadcast |
21 | $w->broadcast; # wake up current and all future wait's |
21 | $w->broadcast; # wake up current and all future wait's |
|
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22 | |
|
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23 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
|
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24 | |
|
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25 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
|
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26 | nowadays. So what is different about AnyEvent? |
|
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27 | |
|
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28 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
|
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29 | policy> and AnyEvent is I<small and efficient>. |
|
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30 | |
|
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31 | First and foremost, I<AnyEvent is not an event model> itself, it only |
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32 | interfaces to whatever event model the main program happens to use in a |
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33 | pragmatic way. For event models and certain classes of immortals alike, |
|
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34 | the statement "there can only be one" is a bitter reality, and AnyEvent |
|
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35 | helps hiding the differences. |
|
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36 | |
|
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37 | The goal of AnyEvent is to offer module authors the ability to do event |
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38 | programming (waiting for I/O or timer events) without subscribing to a |
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39 | religion, a way of living, and most importantly: without forcing your |
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40 | module users into the same thing by forcing them to use the same event |
|
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41 | model you use. |
|
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42 | |
|
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43 | For modules like POE or IO::Async (which is actually doing all I/O |
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44 | I<synchronously>...), using them in your module is like joining a |
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45 | cult: After you joined, you are dependent on them and you cannot use |
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46 | anything else, as it is simply incompatible to everything that isn't |
|
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47 | itself. |
|
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48 | |
|
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49 | AnyEvent + POE works fine. AnyEvent + Glib works fine. AnyEvent + Tk |
|
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50 | works fine etc. etc. but none of these work together with the rest: POE |
|
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51 | + IO::Async? no go. Tk + Event? no go. If your module uses one of |
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52 | those, every user of your module has to use it, too. If your module |
|
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53 | uses AnyEvent, it works transparently with all event models it supports |
|
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54 | (including stuff like POE and IO::Async). |
|
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55 | |
|
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56 | In addition of being free of having to use I<the one and only true event |
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57 | model>, AnyEvent also is free of bloat and policy: with POE or similar |
|
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58 | modules, you get an enourmous amount of code and strict rules you have |
|
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59 | to follow. AnyEvent, on the other hand, is lean and to the point by only |
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60 | offering the functionality that is useful, in as thin as a wrapper as |
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61 | technically possible. |
|
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62 | |
|
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63 | Of course, if you want lots of policy (this can arguably be somewhat |
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64 | useful) and you want to force your users to use the one and only event |
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65 | model, you should I<not> use this module. |
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66 | |
22 | |
67 | |
23 | =head1 DESCRIPTION |
68 | =head1 DESCRIPTION |
24 | |
69 | |
25 | L<AnyEvent> provides an identical interface to multiple event loops. This |
70 | L<AnyEvent> provides an identical interface to multiple event loops. This |
26 | allows module authors to utilise an event loop without forcing module |
71 | allows module authors to utilise an event loop without forcing module |
… | |
… | |
70 | You can create I/O watcher by calling the C<< AnyEvent->io >> method with |
115 | You can create I/O watcher by calling the C<< AnyEvent->io >> method with |
71 | the following mandatory arguments: |
116 | the following mandatory arguments: |
72 | |
117 | |
73 | C<fh> the Perl I<filehandle> (not filedescriptor) to watch for |
118 | C<fh> the Perl I<filehandle> (not filedescriptor) to watch for |
74 | events. C<poll> must be a string that is either C<r> or C<w>, that creates |
119 | events. C<poll> must be a string that is either C<r> or C<w>, that creates |
75 | a watcher waiting for "r"eadable or "w"ritable events. C<cb> teh callback |
120 | a watcher waiting for "r"eadable or "w"ritable events. C<cb> the callback |
76 | to invoke everytime the filehandle becomes ready. |
121 | to invoke everytime the filehandle becomes ready. |
77 | |
122 | |
78 | Only one io watcher per C<fh> and C<poll> combination is allowed (i.e. on |
123 | Only one io watcher per C<fh> and C<poll> combination is allowed (i.e. on |
79 | a socket you can have one r + one w, not any more (limitation comes from |
124 | a socket you can have one r + one w, not any more (limitation comes from |
80 | Tk - if you are sure you are not using Tk this limitation is gone). |
125 | Tk - if you are sure you are not using Tk this limitation is gone). |
… | |
… | |
89 | chomp (my $input = <STDIN>); |
134 | chomp (my $input = <STDIN>); |
90 | warn "read: $input\n"; |
135 | warn "read: $input\n"; |
91 | undef $w; |
136 | undef $w; |
92 | }); |
137 | }); |
93 | |
138 | |
94 | =head2 TIMER WATCHERS |
139 | =head2 TIME WATCHERS |
95 | |
140 | |
96 | You can create a timer watcher by calling the C<< AnyEvent->timer >> |
141 | You can create a time watcher by calling the C<< AnyEvent->timer >> |
97 | method with the following mandatory arguments: |
142 | method with the following mandatory arguments: |
98 | |
143 | |
99 | C<after> after how many seconds (fractions are supported) should the timer |
144 | C<after> after how many seconds (fractions are supported) should the timer |
100 | activate. C<cb> the callback to invoke. |
145 | activate. C<cb> the callback to invoke. |
101 | |
146 | |
… | |
… | |
109 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
154 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
110 | warn "timeout\n"; |
155 | warn "timeout\n"; |
111 | }); |
156 | }); |
112 | |
157 | |
113 | # to cancel the timer: |
158 | # to cancel the timer: |
114 | undef $w |
159 | undef $w; |
115 | |
160 | |
116 | =head2 CONDITION WATCHERS |
161 | =head2 CONDITION WATCHERS |
117 | |
162 | |
118 | Condition watchers can be created by calling the C<< AnyEvent->condvar >> |
163 | Condition watchers can be created by calling the C<< AnyEvent->condvar >> |
119 | method without any arguments. |
164 | method without any arguments. |
120 | |
165 | |
121 | A condition watcher watches for a condition - precisely that the C<< |
166 | A condition watcher watches for a condition - precisely that the C<< |
122 | ->broadcast >> method has been called. |
167 | ->broadcast >> method has been called. |
123 | |
168 | |
|
|
169 | Note that condition watchers recurse into the event loop - if you have |
|
|
170 | two watchers that call C<< ->wait >> in a round-robbin fashion, you |
|
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171 | lose. Therefore, condition watchers are good to export to your caller, but |
|
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172 | you should avoid making a blocking wait, at least in callbacks, as this |
|
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173 | usually asks for trouble. |
|
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174 | |
124 | The watcher has only two methods: |
175 | The watcher has only two methods: |
125 | |
176 | |
126 | =over 4 |
177 | =over 4 |
127 | |
178 | |
128 | =item $cv->wait |
179 | =item $cv->wait |
129 | |
180 | |
130 | Wait (blocking if necessary) until the C<< ->broadcast >> method has been |
181 | Wait (blocking if necessary) until the C<< ->broadcast >> method has been |
131 | called on c<$cv>, while servicing other watchers normally. |
182 | called on c<$cv>, while servicing other watchers normally. |
132 | |
183 | |
133 | Not all event models support a blocking wait - some die in that case, so |
|
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134 | if you are using this from a module, never require a blocking wait, but |
|
|
135 | let the caller decide wether the call will block or not (for example, |
|
|
136 | by coupling condition variables with some kind of request results and |
|
|
137 | supporting callbacks so the caller knows that getting the result will not |
|
|
138 | block, while still suppporting blockign waits if the caller so desires). |
|
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139 | |
|
|
140 | You can only wait once on a condition - additional calls will return |
184 | You can only wait once on a condition - additional calls will return |
141 | immediately. |
185 | immediately. |
|
|
186 | |
|
|
187 | Not all event models support a blocking wait - some die in that case |
|
|
188 | (programs might want to do that so they stay interactive), so I<if you |
|
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189 | are using this from a module, never require a blocking wait>, but let the |
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190 | caller decide wether the call will block or not (for example, by coupling |
|
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191 | condition variables with some kind of request results and supporting |
|
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192 | callbacks so the caller knows that getting the result will not block, |
|
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193 | while still suppporting blocking waits if the caller so desires). |
|
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194 | |
|
|
195 | Another reason I<never> to C<< ->wait >> in a module is that you cannot |
|
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196 | sensibly have two C<< ->wait >>'s in parallel, as that would require |
|
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197 | multiple interpreters or coroutines/threads, none of which C<AnyEvent> |
|
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198 | can supply (the coroutine-aware backends C<Coro::EV> and C<Coro::Event> |
|
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199 | explicitly support concurrent C<< ->wait >>'s from different coroutines, |
|
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200 | however). |
142 | |
201 | |
143 | =item $cv->broadcast |
202 | =item $cv->broadcast |
144 | |
203 | |
145 | Flag the condition as ready - a running C<< ->wait >> and all further |
204 | Flag the condition as ready - a running C<< ->wait >> and all further |
146 | calls to C<wait> will return after this method has been called. If nobody |
205 | calls to C<wait> will return after this method has been called. If nobody |
… | |
… | |
156 | # when the "result" is ready. |
215 | # when the "result" is ready. |
157 | |
216 | |
158 | $result_ready->wait; |
217 | $result_ready->wait; |
159 | |
218 | |
160 | =back |
219 | =back |
|
|
220 | |
|
|
221 | =head2 SIGNAL WATCHERS |
|
|
222 | |
|
|
223 | You can listen for signals using a signal watcher, C<signal> is the signal |
|
|
224 | I<name> without any C<SIG> prefix. Multiple signals events can be clumped |
|
|
225 | together into one callback invocation, and callback invocation might or |
|
|
226 | might not be asynchronous. |
|
|
227 | |
|
|
228 | These watchers might use C<%SIG>, so programs overwriting those signals |
|
|
229 | directly will likely not work correctly. |
|
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230 | |
|
|
231 | Example: exit on SIGINT |
|
|
232 | |
|
|
233 | my $w = AnyEvent->signal (signal => "INT", cb => sub { exit 1 }); |
|
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234 | |
|
|
235 | =head2 CHILD PROCESS WATCHERS |
|
|
236 | |
|
|
237 | You can also listen for the status of a child process specified by the |
|
|
238 | C<pid> argument (or any child if the pid argument is 0). The watcher will |
|
|
239 | trigger as often as status change for the child are received. This works |
|
|
240 | by installing a signal handler for C<SIGCHLD>. The callback will be called with |
|
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241 | the pid and exit status (as returned by waitpid). |
|
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242 | |
|
|
243 | Example: wait for pid 1333 |
|
|
244 | |
|
|
245 | my $w = AnyEvent->child (pid => 1333, cb => sub { warn "exit status $?" }); |
161 | |
246 | |
162 | =head1 GLOBALS |
247 | =head1 GLOBALS |
163 | |
248 | |
164 | =over 4 |
249 | =over 4 |
165 | |
250 | |
… | |
… | |
171 | C<AnyEvent::Impl:xxx> modules, but can be any other class in the case |
256 | C<AnyEvent::Impl:xxx> modules, but can be any other class in the case |
172 | AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode>). |
257 | AnyEvent has been extended at runtime (e.g. in I<rxvt-unicode>). |
173 | |
258 | |
174 | The known classes so far are: |
259 | The known classes so far are: |
175 | |
260 | |
176 | AnyEvent::Impl::Coro based on Coro::Event, best choise. |
261 | AnyEvent::Impl::CoroEV based on Coro::EV, best choice. |
|
|
262 | AnyEvent::Impl::EV based on EV (an interface to libev, also best choice). |
|
|
263 | AnyEvent::Impl::CoroEvent based on Coro::Event, second best choice. |
177 | AnyEvent::Impl::Event based on Event, also best choice :) |
264 | AnyEvent::Impl::Event based on Event, also second best choice :) |
178 | AnyEvent::Impl::Glib based on Glib, second-best choice. |
265 | AnyEvent::Impl::Glib based on Glib, third-best choice. |
179 | AnyEvent::Impl::Tk based on Tk, very bad choice. |
266 | AnyEvent::Impl::Tk based on Tk, very bad choice. |
180 | AnyEvent::Impl::Perl pure-perl implementation, inefficient. |
267 | AnyEvent::Impl::Perl pure-perl implementation, inefficient but portable. |
|
|
268 | |
|
|
269 | =item AnyEvent::detect |
|
|
270 | |
|
|
271 | Returns C<$AnyEvent::MODEL>, forcing autodetection of the event model if |
|
|
272 | necessary. You should only call this function right before you would have |
|
|
273 | created an AnyEvent watcher anyway, that is, very late at runtime. |
181 | |
274 | |
182 | =back |
275 | =back |
183 | |
276 | |
184 | =head1 WHAT TO DO IN A MODULE |
277 | =head1 WHAT TO DO IN A MODULE |
185 | |
278 | |
… | |
… | |
214 | =cut |
307 | =cut |
215 | |
308 | |
216 | package AnyEvent; |
309 | package AnyEvent; |
217 | |
310 | |
218 | no warnings; |
311 | no warnings; |
219 | use strict 'vars'; |
312 | use strict; |
|
|
313 | |
220 | use Carp; |
314 | use Carp; |
221 | |
315 | |
222 | our $VERSION = '2.0'; |
316 | our $VERSION = '3.0'; |
223 | our $MODEL; |
317 | our $MODEL; |
224 | |
318 | |
225 | our $AUTOLOAD; |
319 | our $AUTOLOAD; |
226 | our @ISA; |
320 | our @ISA; |
227 | |
321 | |
228 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
322 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
229 | |
323 | |
230 | our @REGISTRY; |
324 | our @REGISTRY; |
231 | |
325 | |
232 | my @models = ( |
326 | my @models = ( |
|
|
327 | [Coro::EV:: => AnyEvent::Impl::CoroEV::], |
|
|
328 | [EV:: => AnyEvent::Impl::EV::], |
233 | [Coro::Event:: => AnyEvent::Impl::Coro::], |
329 | [Coro::Event:: => AnyEvent::Impl::CoroEvent::], |
234 | [Event:: => AnyEvent::Impl::Event::], |
330 | [Event:: => AnyEvent::Impl::Event::], |
235 | [Glib:: => AnyEvent::Impl::Glib::], |
331 | [Glib:: => AnyEvent::Impl::Glib::], |
236 | [Tk:: => AnyEvent::Impl::Tk::], |
332 | [Tk:: => AnyEvent::Impl::Tk::], |
237 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
333 | [AnyEvent::Impl::Perl:: => AnyEvent::Impl::Perl::], |
238 | ); |
334 | ); |
239 | |
335 | |
240 | our %method = map +($_ => 1), qw(io timer condvar broadcast wait DESTROY); |
336 | our %method = map +($_ => 1), qw(io timer condvar broadcast wait signal one_event DESTROY); |
241 | |
337 | |
242 | sub AUTOLOAD { |
338 | sub detect() { |
243 | $AUTOLOAD =~ s/.*://; |
|
|
244 | |
|
|
245 | $method{$AUTOLOAD} |
|
|
246 | or croak "$AUTOLOAD: not a valid method for AnyEvent objects"; |
|
|
247 | |
|
|
248 | unless ($MODEL) { |
339 | unless ($MODEL) { |
|
|
340 | no strict 'refs'; |
|
|
341 | |
249 | # check for already loaded models |
342 | # check for already loaded models |
250 | for (@REGISTRY, @models) { |
343 | for (@REGISTRY, @models) { |
251 | my ($package, $model) = @$_; |
344 | my ($package, $model) = @$_; |
252 | if (${"$package\::VERSION"} > 0) { |
345 | if (${"$package\::VERSION"} > 0) { |
253 | if (eval "require $model") { |
346 | if (eval "require $model") { |
… | |
… | |
261 | unless ($MODEL) { |
354 | unless ($MODEL) { |
262 | # try to load a model |
355 | # try to load a model |
263 | |
356 | |
264 | for (@REGISTRY, @models) { |
357 | for (@REGISTRY, @models) { |
265 | my ($package, $model) = @$_; |
358 | my ($package, $model) = @$_; |
|
|
359 | if (eval "require $package" |
|
|
360 | and ${"$package\::VERSION"} > 0 |
266 | if (eval "require $model") { |
361 | and eval "require $model") { |
267 | $MODEL = $model; |
362 | $MODEL = $model; |
268 | warn "AnyEvent: autoprobed and loaded model '$model', using it.\n" if $verbose > 1; |
363 | warn "AnyEvent: autoprobed and loaded model '$model', using it.\n" if $verbose > 1; |
269 | last; |
364 | last; |
270 | } |
365 | } |
271 | } |
366 | } |
272 | |
367 | |
273 | $MODEL |
368 | $MODEL |
274 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: Coro, Event, Glib or Tk."; |
369 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV (or Coro+EV), Event (or Coro+Event), Glib or Tk."; |
275 | } |
370 | } |
|
|
371 | |
|
|
372 | unshift @ISA, $MODEL; |
|
|
373 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
276 | } |
374 | } |
277 | |
375 | |
278 | @ISA = $MODEL; |
376 | $MODEL |
|
|
377 | } |
|
|
378 | |
|
|
379 | sub AUTOLOAD { |
|
|
380 | (my $func = $AUTOLOAD) =~ s/.*://; |
|
|
381 | |
|
|
382 | $method{$func} |
|
|
383 | or croak "$func: not a valid method for AnyEvent objects"; |
|
|
384 | |
|
|
385 | detect unless $MODEL; |
279 | |
386 | |
280 | my $class = shift; |
387 | my $class = shift; |
281 | $class->$AUTOLOAD (@_); |
388 | $class->$func (@_); |
|
|
389 | } |
|
|
390 | |
|
|
391 | package AnyEvent::Base; |
|
|
392 | |
|
|
393 | # default implementation for ->condvar, ->wait, ->broadcast |
|
|
394 | |
|
|
395 | sub condvar { |
|
|
396 | bless \my $flag, "AnyEvent::Base::CondVar" |
|
|
397 | } |
|
|
398 | |
|
|
399 | sub AnyEvent::Base::CondVar::broadcast { |
|
|
400 | ${$_[0]}++; |
|
|
401 | } |
|
|
402 | |
|
|
403 | sub AnyEvent::Base::CondVar::wait { |
|
|
404 | AnyEvent->one_event while !${$_[0]}; |
|
|
405 | } |
|
|
406 | |
|
|
407 | # default implementation for ->signal |
|
|
408 | |
|
|
409 | our %SIG_CB; |
|
|
410 | |
|
|
411 | sub signal { |
|
|
412 | my (undef, %arg) = @_; |
|
|
413 | |
|
|
414 | my $signal = uc $arg{signal} |
|
|
415 | or Carp::croak "required option 'signal' is missing"; |
|
|
416 | |
|
|
417 | $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; |
|
|
418 | $SIG{$signal} ||= sub { |
|
|
419 | $_->() for values %{ $SIG_CB{$signal} || {} }; |
|
|
420 | }; |
|
|
421 | |
|
|
422 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
|
|
423 | } |
|
|
424 | |
|
|
425 | sub AnyEvent::Base::Signal::DESTROY { |
|
|
426 | my ($signal, $cb) = @{$_[0]}; |
|
|
427 | |
|
|
428 | delete $SIG_CB{$signal}{$cb}; |
|
|
429 | |
|
|
430 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
|
|
431 | } |
|
|
432 | |
|
|
433 | # default implementation for ->child |
|
|
434 | |
|
|
435 | our %PID_CB; |
|
|
436 | our $CHLD_W; |
|
|
437 | our $CHLD_DELAY_W; |
|
|
438 | our $PID_IDLE; |
|
|
439 | our $WNOHANG; |
|
|
440 | |
|
|
441 | sub _child_wait { |
|
|
442 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
|
|
443 | $_->($pid, $?) for (values %{ $PID_CB{$pid} || {} }), |
|
|
444 | (values %{ $PID_CB{0} || {} }); |
|
|
445 | } |
|
|
446 | |
|
|
447 | undef $PID_IDLE; |
|
|
448 | } |
|
|
449 | |
|
|
450 | sub _sigchld { |
|
|
451 | # make sure we deliver these changes "synchronous" with the event loop. |
|
|
452 | $CHLD_DELAY_W ||= AnyEvent->timer (after => 0, cb => sub { |
|
|
453 | undef $CHLD_DELAY_W; |
|
|
454 | &_child_wait; |
|
|
455 | }); |
|
|
456 | } |
|
|
457 | |
|
|
458 | sub child { |
|
|
459 | my (undef, %arg) = @_; |
|
|
460 | |
|
|
461 | defined (my $pid = $arg{pid} + 0) |
|
|
462 | or Carp::croak "required option 'pid' is missing"; |
|
|
463 | |
|
|
464 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
|
|
465 | |
|
|
466 | unless ($WNOHANG) { |
|
|
467 | $WNOHANG = eval { require POSIX; &POSIX::WNOHANG } || 1; |
|
|
468 | } |
|
|
469 | |
|
|
470 | unless ($CHLD_W) { |
|
|
471 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
|
|
472 | # child could be a zombie already, so make at least one round |
|
|
473 | &_sigchld; |
|
|
474 | } |
|
|
475 | |
|
|
476 | bless [$pid, $arg{cb}], "AnyEvent::Base::Child" |
|
|
477 | } |
|
|
478 | |
|
|
479 | sub AnyEvent::Base::Child::DESTROY { |
|
|
480 | my ($pid, $cb) = @{$_[0]}; |
|
|
481 | |
|
|
482 | delete $PID_CB{$pid}{$cb}; |
|
|
483 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
|
|
484 | |
|
|
485 | undef $CHLD_W unless keys %PID_CB; |
282 | } |
486 | } |
283 | |
487 | |
284 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
488 | =head1 SUPPLYING YOUR OWN EVENT MODEL INTERFACE |
285 | |
489 | |
286 | If you need to support another event library which isn't directly |
490 | If you need to support another event library which isn't directly |
… | |
… | |
297 | This tells AnyEvent to (literally) use the C<urxvt::anyevent::> |
501 | This tells AnyEvent to (literally) use the C<urxvt::anyevent::> |
298 | package/class when it finds the C<urxvt> package/module is loaded. When |
502 | package/class when it finds the C<urxvt> package/module is loaded. When |
299 | AnyEvent is loaded and asked to find a suitable event model, it will |
503 | AnyEvent is loaded and asked to find a suitable event model, it will |
300 | first check for the presence of urxvt. |
504 | first check for the presence of urxvt. |
301 | |
505 | |
302 | The class should prove implementations for all watcher types (see |
506 | The class should provide implementations for all watcher types (see |
303 | L<AnyEvent::Impl::Event> (source code), L<AnyEvent::Impl::Glib> |
507 | L<AnyEvent::Impl::Event> (source code), L<AnyEvent::Impl::Glib> |
304 | (Source code) and so on for actual examples, use C<perldoc -m |
508 | (Source code) and so on for actual examples, use C<perldoc -m |
305 | AnyEvent::Impl::Glib> to see the sources). |
509 | AnyEvent::Impl::Glib> to see the sources). |
306 | |
510 | |
307 | The above isn't fictitious, the I<rxvt-unicode> (a.k.a. urxvt) |
511 | The above isn't fictitious, the I<rxvt-unicode> (a.k.a. urxvt) |
… | |
… | |
311 | I<rxvt-unicode> distribution. |
515 | I<rxvt-unicode> distribution. |
312 | |
516 | |
313 | I<rxvt-unicode> also cheats a bit by not providing blocking access to |
517 | I<rxvt-unicode> also cheats a bit by not providing blocking access to |
314 | condition variables: code blocking while waiting for a condition will |
518 | condition variables: code blocking while waiting for a condition will |
315 | C<die>. This still works with most modules/usages, and blocking calls must |
519 | C<die>. This still works with most modules/usages, and blocking calls must |
316 | not be in an interactive appliation, so it makes sense. |
520 | not be in an interactive application, so it makes sense. |
317 | |
521 | |
318 | =head1 ENVIRONMENT VARIABLES |
522 | =head1 ENVIRONMENT VARIABLES |
319 | |
523 | |
320 | The following environment variables are used by this module: |
524 | The following environment variables are used by this module: |
321 | |
525 | |