1 | =head1 => NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent - provide framework for multiple event loops |
3 | AnyEvent - provide framework for multiple event loops |
4 | |
4 | |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops |
6 | |
6 | |
… | |
… | |
33 | |
33 | |
34 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
34 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
35 | policy> and AnyEvent is I<small and efficient>. |
35 | policy> and AnyEvent is I<small and efficient>. |
36 | |
36 | |
37 | First and foremost, I<AnyEvent is not an event model> itself, it only |
37 | First and foremost, I<AnyEvent is not an event model> itself, it only |
38 | interfaces to whatever event model the main program happens to use in a |
38 | interfaces to whatever event model the main program happens to use, in a |
39 | pragmatic way. For event models and certain classes of immortals alike, |
39 | pragmatic way. For event models and certain classes of immortals alike, |
40 | the statement "there can only be one" is a bitter reality: In general, |
40 | the statement "there can only be one" is a bitter reality: In general, |
41 | only one event loop can be active at the same time in a process. AnyEvent |
41 | only one event loop can be active at the same time in a process. AnyEvent |
42 | helps hiding the differences between those event loops. |
42 | cannot change this, but it can hide the differences between those event |
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43 | loops. |
43 | |
44 | |
44 | The goal of AnyEvent is to offer module authors the ability to do event |
45 | The goal of AnyEvent is to offer module authors the ability to do event |
45 | programming (waiting for I/O or timer events) without subscribing to a |
46 | programming (waiting for I/O or timer events) without subscribing to a |
46 | religion, a way of living, and most importantly: without forcing your |
47 | religion, a way of living, and most importantly: without forcing your |
47 | module users into the same thing by forcing them to use the same event |
48 | module users into the same thing by forcing them to use the same event |
48 | model you use. |
49 | model you use. |
49 | |
50 | |
50 | For modules like POE or IO::Async (which is a total misnomer as it is |
51 | For modules like POE or IO::Async (which is a total misnomer as it is |
51 | actually doing all I/O I<synchronously>...), using them in your module is |
52 | actually doing all I/O I<synchronously>...), using them in your module is |
52 | like joining a cult: After you joined, you are dependent on them and you |
53 | like joining a cult: After you joined, you are dependent on them and you |
53 | cannot use anything else, as it is simply incompatible to everything that |
54 | cannot use anything else, as they are simply incompatible to everything |
54 | isn't itself. What's worse, all the potential users of your module are |
55 | that isn't them. What's worse, all the potential users of your |
55 | I<also> forced to use the same event loop you use. |
56 | module are I<also> forced to use the same event loop you use. |
56 | |
57 | |
57 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
58 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
58 | fine. AnyEvent + Tk works fine etc. etc. but none of these work together |
59 | fine. AnyEvent + Tk works fine etc. etc. but none of these work together |
59 | with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if |
60 | with the rest: POE + IO::Async? No go. Tk + Event? No go. Again: if |
60 | your module uses one of those, every user of your module has to use it, |
61 | your module uses one of those, every user of your module has to use it, |
61 | too. But if your module uses AnyEvent, it works transparently with all |
62 | too. But if your module uses AnyEvent, it works transparently with all |
62 | event models it supports (including stuff like POE and IO::Async, as long |
63 | event models it supports (including stuff like IO::Async, as long as those |
63 | as those use one of the supported event loops. It is trivial to add new |
64 | use one of the supported event loops. It is trivial to add new event loops |
64 | event loops to AnyEvent, too, so it is future-proof). |
65 | to AnyEvent, too, so it is future-proof). |
65 | |
66 | |
66 | In addition to being free of having to use I<the one and only true event |
67 | In addition to being free of having to use I<the one and only true event |
67 | model>, AnyEvent also is free of bloat and policy: with POE or similar |
68 | model>, AnyEvent also is free of bloat and policy: with POE or similar |
68 | modules, you get an enormous amount of code and strict rules you have to |
69 | modules, you get an enormous amount of code and strict rules you have to |
69 | follow. AnyEvent, on the other hand, is lean and up to the point, by only |
70 | follow. AnyEvent, on the other hand, is lean and up to the point, by only |
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138 | Many watchers either are used with "recursion" (repeating timers for |
139 | Many watchers either are used with "recursion" (repeating timers for |
139 | example), or need to refer to their watcher object in other ways. |
140 | example), or need to refer to their watcher object in other ways. |
140 | |
141 | |
141 | An any way to achieve that is this pattern: |
142 | An any way to achieve that is this pattern: |
142 | |
143 | |
143 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
144 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
144 | # you can use $w here, for example to undef it |
145 | # you can use $w here, for example to undef it |
145 | undef $w; |
146 | undef $w; |
146 | }); |
147 | }); |
147 | |
148 | |
148 | Note that C<my $w; $w => combination. This is necessary because in Perl, |
149 | Note that C<my $w; $w => combination. This is necessary because in Perl, |
149 | my variables are only visible after the statement in which they are |
150 | my variables are only visible after the statement in which they are |
150 | declared. |
151 | declared. |
151 | |
152 | |
152 | =head2 I/O WATCHERS |
153 | =head2 I/O WATCHERS |
153 | |
154 | |
154 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
155 | You can create an I/O watcher by calling the C<< AnyEvent->io >> method |
155 | with the following mandatory key-value pairs as arguments: |
156 | with the following mandatory key-value pairs as arguments: |
156 | |
157 | |
157 | C<fh> the Perl I<file handle> (I<not> file descriptor) to watch |
158 | C<fh> the Perl I<file handle> (I<not> file descriptor) to watch for events |
158 | for events. C<poll> must be a string that is either C<r> or C<w>, |
159 | (AnyEvent might or might not keep a reference to this file handle). C<poll> |
159 | which creates a watcher waiting for "r"eadable or "w"ritable events, |
160 | must be a string that is either C<r> or C<w>, which creates a watcher |
160 | respectively. C<cb> is the callback to invoke each time the file handle |
161 | waiting for "r"eadable or "w"ritable events, respectively. C<cb> is the |
161 | becomes ready. |
162 | callback to invoke each time the file handle becomes ready. |
162 | |
163 | |
163 | Although the callback might get passed parameters, their value and |
164 | Although the callback might get passed parameters, their value and |
164 | presence is undefined and you cannot rely on them. Portable AnyEvent |
165 | presence is undefined and you cannot rely on them. Portable AnyEvent |
165 | callbacks cannot use arguments passed to I/O watcher callbacks. |
166 | callbacks cannot use arguments passed to I/O watcher callbacks. |
166 | |
167 | |
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170 | |
171 | |
171 | Some event loops issue spurious readyness notifications, so you should |
172 | Some event loops issue spurious readyness notifications, so you should |
172 | always use non-blocking calls when reading/writing from/to your file |
173 | always use non-blocking calls when reading/writing from/to your file |
173 | handles. |
174 | handles. |
174 | |
175 | |
175 | Example: |
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176 | |
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177 | # wait for readability of STDIN, then read a line and disable the watcher |
176 | Example: wait for readability of STDIN, then read a line and disable the |
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177 | watcher. |
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178 | |
178 | my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
179 | my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
179 | chomp (my $input = <STDIN>); |
180 | chomp (my $input = <STDIN>); |
180 | warn "read: $input\n"; |
181 | warn "read: $input\n"; |
181 | undef $w; |
182 | undef $w; |
182 | }); |
183 | }); |
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192 | |
193 | |
193 | Although the callback might get passed parameters, their value and |
194 | Although the callback might get passed parameters, their value and |
194 | presence is undefined and you cannot rely on them. Portable AnyEvent |
195 | presence is undefined and you cannot rely on them. Portable AnyEvent |
195 | callbacks cannot use arguments passed to time watcher callbacks. |
196 | callbacks cannot use arguments passed to time watcher callbacks. |
196 | |
197 | |
197 | The timer callback will be invoked at most once: if you want a repeating |
198 | The callback will normally be invoked once only. If you specify another |
198 | timer you have to create a new watcher (this is a limitation by both Tk |
199 | parameter, C<interval>, as a strictly positive number (> 0), then the |
199 | and Glib). |
200 | callback will be invoked regularly at that interval (in fractional |
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201 | seconds) after the first invocation. If C<interval> is specified with a |
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202 | false value, then it is treated as if it were missing. |
200 | |
203 | |
201 | Example: |
204 | The callback will be rescheduled before invoking the callback, but no |
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205 | attempt is done to avoid timer drift in most backends, so the interval is |
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206 | only approximate. |
202 | |
207 | |
203 | # fire an event after 7.7 seconds |
208 | Example: fire an event after 7.7 seconds. |
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209 | |
204 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
210 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
205 | warn "timeout\n"; |
211 | warn "timeout\n"; |
206 | }); |
212 | }); |
207 | |
213 | |
208 | # to cancel the timer: |
214 | # to cancel the timer: |
209 | undef $w; |
215 | undef $w; |
210 | |
216 | |
211 | Example 2: |
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212 | |
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213 | # fire an event after 0.5 seconds, then roughly every second |
217 | Example 2: fire an event after 0.5 seconds, then roughly every second. |
214 | my $w; |
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215 | |
218 | |
216 | my $cb = sub { |
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217 | # cancel the old timer while creating a new one |
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218 | $w = AnyEvent->timer (after => 1, cb => $cb); |
219 | my $w = AnyEvent->timer (after => 0.5, interval => 1, cb => sub { |
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220 | warn "timeout\n"; |
219 | }; |
221 | }; |
220 | |
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221 | # start the "loop" by creating the first watcher |
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222 | $w = AnyEvent->timer (after => 0.5, cb => $cb); |
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223 | |
222 | |
224 | =head3 TIMING ISSUES |
223 | =head3 TIMING ISSUES |
225 | |
224 | |
226 | There are two ways to handle timers: based on real time (relative, "fire |
225 | There are two ways to handle timers: based on real time (relative, "fire |
227 | in 10 seconds") and based on wallclock time (absolute, "fire at 12 |
226 | in 10 seconds") and based on wallclock time (absolute, "fire at 12 |
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305 | =back |
304 | =back |
306 | |
305 | |
307 | =head2 SIGNAL WATCHERS |
306 | =head2 SIGNAL WATCHERS |
308 | |
307 | |
309 | You can watch for signals using a signal watcher, C<signal> is the signal |
308 | You can watch for signals using a signal watcher, C<signal> is the signal |
310 | I<name> without any C<SIG> prefix, C<cb> is the Perl callback to |
309 | I<name> in uppercase and without any C<SIG> prefix, C<cb> is the Perl |
311 | be invoked whenever a signal occurs. |
310 | callback to be invoked whenever a signal occurs. |
312 | |
311 | |
313 | Although the callback might get passed parameters, their value and |
312 | Although the callback might get passed parameters, their value and |
314 | presence is undefined and you cannot rely on them. Portable AnyEvent |
313 | presence is undefined and you cannot rely on them. Portable AnyEvent |
315 | callbacks cannot use arguments passed to signal watcher callbacks. |
314 | callbacks cannot use arguments passed to signal watcher callbacks. |
316 | |
315 | |
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352 | AnyEvent program, you I<have> to create at least one watcher before you |
351 | AnyEvent program, you I<have> to create at least one watcher before you |
353 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
352 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
354 | |
353 | |
355 | Example: fork a process and wait for it |
354 | Example: fork a process and wait for it |
356 | |
355 | |
357 | my $done = AnyEvent->condvar; |
356 | my $done = AnyEvent->condvar; |
358 | |
357 | |
359 | my $pid = fork or exit 5; |
358 | my $pid = fork or exit 5; |
360 | |
359 | |
361 | my $w = AnyEvent->child ( |
360 | my $w = AnyEvent->child ( |
362 | pid => $pid, |
361 | pid => $pid, |
363 | cb => sub { |
362 | cb => sub { |
364 | my ($pid, $status) = @_; |
363 | my ($pid, $status) = @_; |
365 | warn "pid $pid exited with status $status"; |
364 | warn "pid $pid exited with status $status"; |
366 | $done->send; |
365 | $done->send; |
367 | }, |
366 | }, |
368 | ); |
367 | ); |
369 | |
368 | |
370 | # do something else, then wait for process exit |
369 | # do something else, then wait for process exit |
371 | $done->recv; |
370 | $done->recv; |
372 | |
371 | |
373 | =head2 CONDITION VARIABLES |
372 | =head2 CONDITION VARIABLES |
374 | |
373 | |
375 | If you are familiar with some event loops you will know that all of them |
374 | If you are familiar with some event loops you will know that all of them |
376 | require you to run some blocking "loop", "run" or similar function that |
375 | require you to run some blocking "loop", "run" or similar function that |
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597 | |
596 | |
598 | This is a mutator function that returns the callback set and optionally |
597 | This is a mutator function that returns the callback set and optionally |
599 | replaces it before doing so. |
598 | replaces it before doing so. |
600 | |
599 | |
601 | The callback will be called when the condition becomes "true", i.e. when |
600 | The callback will be called when the condition becomes "true", i.e. when |
602 | C<send> or C<croak> are called. Calling C<recv> inside the callback |
601 | C<send> or C<croak> are called, with the only argument being the condition |
603 | or at any later time is guaranteed not to block. |
602 | variable itself. Calling C<recv> inside the callback or at any later time |
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603 | is guaranteed not to block. |
604 | |
604 | |
605 | =back |
605 | =back |
606 | |
606 | |
607 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
607 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
608 | |
608 | |
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737 | =item L<AnyEvent::Util> |
737 | =item L<AnyEvent::Util> |
738 | |
738 | |
739 | Contains various utility functions that replace often-used but blocking |
739 | Contains various utility functions that replace often-used but blocking |
740 | functions such as C<inet_aton> by event-/callback-based versions. |
740 | functions such as C<inet_aton> by event-/callback-based versions. |
741 | |
741 | |
742 | =item L<AnyEvent::Handle> |
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743 | |
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744 | Provide read and write buffers and manages watchers for reads and writes. |
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745 | |
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746 | =item L<AnyEvent::Socket> |
742 | =item L<AnyEvent::Socket> |
747 | |
743 | |
748 | Provides various utility functions for (internet protocol) sockets, |
744 | Provides various utility functions for (internet protocol) sockets, |
749 | addresses and name resolution. Also functions to create non-blocking tcp |
745 | addresses and name resolution. Also functions to create non-blocking tcp |
750 | connections or tcp servers, with IPv6 and SRV record support and more. |
746 | connections or tcp servers, with IPv6 and SRV record support and more. |
751 | |
747 | |
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748 | =item L<AnyEvent::Handle> |
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749 | |
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750 | Provide read and write buffers, manages watchers for reads and writes, |
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751 | supports raw and formatted I/O, I/O queued and fully transparent and |
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752 | non-blocking SSL/TLS. |
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753 | |
752 | =item L<AnyEvent::DNS> |
754 | =item L<AnyEvent::DNS> |
753 | |
755 | |
754 | Provides rich asynchronous DNS resolver capabilities. |
756 | Provides rich asynchronous DNS resolver capabilities. |
755 | |
757 | |
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|
758 | =item L<AnyEvent::HTTP> |
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759 | |
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760 | A simple-to-use HTTP library that is capable of making a lot of concurrent |
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761 | HTTP requests. |
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762 | |
756 | =item L<AnyEvent::HTTPD> |
763 | =item L<AnyEvent::HTTPD> |
757 | |
764 | |
758 | Provides a simple web application server framework. |
765 | Provides a simple web application server framework. |
759 | |
766 | |
760 | =item L<AnyEvent::FastPing> |
767 | =item L<AnyEvent::FastPing> |
761 | |
768 | |
762 | The fastest ping in the west. |
769 | The fastest ping in the west. |
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770 | |
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771 | =item L<AnyEvent::DBI> |
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772 | |
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773 | Executes L<DBI> requests asynchronously in a proxy process. |
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774 | |
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775 | =item L<AnyEvent::AIO> |
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776 | |
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777 | Truly asynchronous I/O, should be in the toolbox of every event |
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778 | programmer. AnyEvent::AIO transparently fuses L<IO::AIO> and AnyEvent |
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779 | together. |
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780 | |
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781 | =item L<AnyEvent::BDB> |
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782 | |
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783 | Truly asynchronous Berkeley DB access. AnyEvent::BDB transparently fuses |
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784 | L<BDB> and AnyEvent together. |
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785 | |
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786 | =item L<AnyEvent::GPSD> |
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787 | |
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788 | A non-blocking interface to gpsd, a daemon delivering GPS information. |
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789 | |
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790 | =item L<AnyEvent::IGS> |
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791 | |
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792 | A non-blocking interface to the Internet Go Server protocol (used by |
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793 | L<App::IGS>). |
763 | |
794 | |
764 | =item L<Net::IRC3> |
795 | =item L<Net::IRC3> |
765 | |
796 | |
766 | AnyEvent based IRC client module family. |
797 | AnyEvent based IRC client module family. |
767 | |
798 | |
… | |
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780 | |
811 | |
781 | =item L<Coro> |
812 | =item L<Coro> |
782 | |
813 | |
783 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
814 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
784 | |
815 | |
785 | =item L<AnyEvent::AIO>, L<IO::AIO> |
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786 | |
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787 | Truly asynchronous I/O, should be in the toolbox of every event |
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788 | programmer. AnyEvent::AIO transparently fuses IO::AIO and AnyEvent |
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789 | together. |
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790 | |
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791 | =item L<AnyEvent::BDB>, L<BDB> |
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792 | |
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793 | Truly asynchronous Berkeley DB access. AnyEvent::AIO transparently fuses |
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794 | IO::AIO and AnyEvent together. |
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795 | |
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796 | =item L<IO::Lambda> |
816 | =item L<IO::Lambda> |
797 | |
817 | |
798 | The lambda approach to I/O - don't ask, look there. Can use AnyEvent. |
818 | The lambda approach to I/O - don't ask, look there. Can use AnyEvent. |
799 | |
819 | |
800 | =back |
820 | =back |
… | |
… | |
806 | no warnings; |
826 | no warnings; |
807 | use strict; |
827 | use strict; |
808 | |
828 | |
809 | use Carp; |
829 | use Carp; |
810 | |
830 | |
811 | our $VERSION = 4.11; |
831 | our $VERSION = 4.2; |
812 | our $MODEL; |
832 | our $MODEL; |
813 | |
833 | |
814 | our $AUTOLOAD; |
834 | our $AUTOLOAD; |
815 | our @ISA; |
835 | our @ISA; |
816 | |
836 | |
… | |
… | |
919 | $MODEL |
939 | $MODEL |
920 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib."; |
940 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib."; |
921 | } |
941 | } |
922 | } |
942 | } |
923 | |
943 | |
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944 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
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945 | |
924 | unshift @ISA, $MODEL; |
946 | unshift @ISA, $MODEL; |
925 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
947 | |
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948 | require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT}; |
926 | |
949 | |
927 | (shift @post_detect)->() while @post_detect; |
950 | (shift @post_detect)->() while @post_detect; |
928 | } |
951 | } |
929 | |
952 | |
930 | $MODEL |
953 | $MODEL |
… | |
… | |
938 | |
961 | |
939 | detect unless $MODEL; |
962 | detect unless $MODEL; |
940 | |
963 | |
941 | my $class = shift; |
964 | my $class = shift; |
942 | $class->$func (@_); |
965 | $class->$func (@_); |
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966 | } |
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967 | |
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968 | # utility function to dup a filehandle. this is used by many backends |
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969 | # to support binding more than one watcher per filehandle (they usually |
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970 | # allow only one watcher per fd, so we dup it to get a different one). |
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971 | sub _dupfh($$$$) { |
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972 | my ($poll, $fh, $r, $w) = @_; |
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973 | |
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974 | require Fcntl; |
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975 | |
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976 | # cygwin requires the fh mode to be matching, unix doesn't |
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977 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") |
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978 | : $poll eq "w" ? ($w, ">") |
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979 | : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'"; |
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980 | |
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981 | open my $fh2, "$mode&" . fileno $fh |
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982 | or die "cannot dup() filehandle: $!"; |
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983 | |
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984 | # we assume CLOEXEC is already set by perl in all important cases |
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985 | |
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986 | ($fh2, $rw) |
943 | } |
987 | } |
944 | |
988 | |
945 | package AnyEvent::Base; |
989 | package AnyEvent::Base; |
946 | |
990 | |
947 | # default implementation for now and time |
991 | # default implementation for now and time |
… | |
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978 | sub AnyEvent::Base::Signal::DESTROY { |
1022 | sub AnyEvent::Base::Signal::DESTROY { |
979 | my ($signal, $cb) = @{$_[0]}; |
1023 | my ($signal, $cb) = @{$_[0]}; |
980 | |
1024 | |
981 | delete $SIG_CB{$signal}{$cb}; |
1025 | delete $SIG_CB{$signal}{$cb}; |
982 | |
1026 | |
983 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
1027 | delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
984 | } |
1028 | } |
985 | |
1029 | |
986 | # default implementation for ->child |
1030 | # default implementation for ->child |
987 | |
1031 | |
988 | our %PID_CB; |
1032 | our %PID_CB; |
… | |
… | |
1158 | C<PERL_ANYEVENT_MODEL>. |
1202 | C<PERL_ANYEVENT_MODEL>. |
1159 | |
1203 | |
1160 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
1204 | When set to C<2> or higher, cause AnyEvent to report to STDERR which event |
1161 | model it chooses. |
1205 | model it chooses. |
1162 | |
1206 | |
|
|
1207 | =item C<PERL_ANYEVENT_STRICT> |
|
|
1208 | |
|
|
1209 | AnyEvent does not do much argument checking by default, as thorough |
|
|
1210 | argument checking is very costly. Setting this variable to a true value |
|
|
1211 | will cause AnyEvent to thoroughly check the arguments passed to most |
|
|
1212 | method calls and croaks if it finds any problems. In other words, enables |
|
|
1213 | "strict" mode. Unlike C<use strict> it is definitely recommended ot keep |
|
|
1214 | it off in production. |
|
|
1215 | |
1163 | =item C<PERL_ANYEVENT_MODEL> |
1216 | =item C<PERL_ANYEVENT_MODEL> |
1164 | |
1217 | |
1165 | This can be used to specify the event model to be used by AnyEvent, before |
1218 | This can be used to specify the event model to be used by AnyEvent, before |
1166 | auto detection and -probing kicks in. It must be a string consisting |
1219 | auto detection and -probing kicks in. It must be a string consisting |
1167 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
1220 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
… | |
… | |
1172 | This functionality might change in future versions. |
1225 | This functionality might change in future versions. |
1173 | |
1226 | |
1174 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1227 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1175 | could start your program like this: |
1228 | could start your program like this: |
1176 | |
1229 | |
1177 | PERL_ANYEVENT_MODEL=Perl perl ... |
1230 | PERL_ANYEVENT_MODEL=Perl perl ... |
1178 | |
1231 | |
1179 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1232 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1180 | |
1233 | |
1181 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1234 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1182 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
1235 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
… | |
… | |
1657 | specified in the variable. |
1710 | specified in the variable. |
1658 | |
1711 | |
1659 | You can make AnyEvent completely ignore this variable by deleting it |
1712 | You can make AnyEvent completely ignore this variable by deleting it |
1660 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1713 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1661 | |
1714 | |
1662 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1715 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1663 | |
1716 | |
1664 | use AnyEvent; |
1717 | use AnyEvent; |
1665 | |
1718 | |
1666 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1719 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1667 | be used to probe what backend is used and gain other information (which is |
1720 | be used to probe what backend is used and gain other information (which is |
1668 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL). |
1721 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and |
|
|
1722 | $ENV{PERL_ANYEGENT_STRICT}. |
|
|
1723 | |
|
|
1724 | |
|
|
1725 | =head1 BUGS |
|
|
1726 | |
|
|
1727 | Perl 5.8 has numerous memleaks that sometimes hit this module and are hard |
|
|
1728 | to work around. If you suffer from memleaks, first upgrade to Perl 5.10 |
|
|
1729 | and check wether the leaks still show up. (Perl 5.10.0 has other annoying |
|
|
1730 | mamleaks, such as leaking on C<map> and C<grep> but it is usually not as |
|
|
1731 | pronounced). |
1669 | |
1732 | |
1670 | |
1733 | |
1671 | =head1 SEE ALSO |
1734 | =head1 SEE ALSO |
1672 | |
1735 | |
1673 | Utility functions: L<AnyEvent::Util>. |
1736 | Utility functions: L<AnyEvent::Util>. |
… | |
… | |
1690 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1753 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1691 | |
1754 | |
1692 | |
1755 | |
1693 | =head1 AUTHOR |
1756 | =head1 AUTHOR |
1694 | |
1757 | |
1695 | Marc Lehmann <schmorp@schmorp.de> |
1758 | Marc Lehmann <schmorp@schmorp.de> |
1696 | http://home.schmorp.de/ |
1759 | http://home.schmorp.de/ |
1697 | |
1760 | |
1698 | =cut |
1761 | =cut |
1699 | |
1762 | |
1700 | 1 |
1763 | 1 |
1701 | |
1764 | |