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 | |
… | |
… | |
18 | |
18 | |
19 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
19 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
20 | $w->send; # wake up current and all future recv's |
20 | $w->send; # wake up current and all future recv's |
21 | $w->recv; # enters "main loop" till $condvar gets ->send |
21 | $w->recv; # enters "main loop" till $condvar gets ->send |
22 | |
22 | |
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23 | =head1 INTRODUCTION/TUTORIAL |
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24 | |
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25 | This manpage is mainly a reference manual. If you are interested |
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26 | in a tutorial or some gentle introduction, have a look at the |
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27 | L<AnyEvent::Intro> manpage. |
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28 | |
23 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
29 | =head1 WHY YOU SHOULD USE THIS MODULE (OR NOT) |
24 | |
30 | |
25 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
31 | Glib, POE, IO::Async, Event... CPAN offers event models by the dozen |
26 | nowadays. So what is different about AnyEvent? |
32 | nowadays. So what is different about AnyEvent? |
27 | |
33 | |
28 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
34 | Executive Summary: AnyEvent is I<compatible>, AnyEvent is I<free of |
29 | policy> and AnyEvent is I<small and efficient>. |
35 | policy> and AnyEvent is I<small and efficient>. |
30 | |
36 | |
31 | 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 |
32 | 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 |
33 | pragmatic way. For event models and certain classes of immortals alike, |
39 | pragmatic way. For event models and certain classes of immortals alike, |
34 | 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, |
35 | 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 |
36 | 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. |
37 | |
44 | |
38 | 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 |
39 | 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 |
40 | religion, a way of living, and most importantly: without forcing your |
47 | religion, a way of living, and most importantly: without forcing your |
41 | 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 |
42 | model you use. |
49 | model you use. |
43 | |
50 | |
44 | 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 |
45 | 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 |
46 | 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 |
47 | cannot use anything else, as it is simply incompatible to everything that |
54 | cannot use anything else, as they are simply incompatible to everything |
48 | 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 |
49 | 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. |
50 | |
57 | |
51 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
58 | AnyEvent is different: AnyEvent + POE works fine. AnyEvent + Glib works |
52 | 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 |
53 | 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 |
54 | 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, |
55 | 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 |
56 | 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 |
57 | 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 |
58 | event loops to AnyEvent, too, so it is future-proof). |
65 | to AnyEvent, too, so it is future-proof). |
59 | |
66 | |
60 | 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 |
61 | 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 |
62 | 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 |
63 | 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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132 | Many watchers either are used with "recursion" (repeating timers for |
139 | Many watchers either are used with "recursion" (repeating timers for |
133 | 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. |
134 | |
141 | |
135 | An any way to achieve that is this pattern: |
142 | An any way to achieve that is this pattern: |
136 | |
143 | |
137 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
144 | my $w; $w = AnyEvent->type (arg => value ..., cb => sub { |
138 | # you can use $w here, for example to undef it |
145 | # you can use $w here, for example to undef it |
139 | undef $w; |
146 | undef $w; |
140 | }); |
147 | }); |
141 | |
148 | |
142 | 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, |
143 | 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 |
144 | declared. |
151 | declared. |
145 | |
152 | |
146 | =head2 I/O WATCHERS |
153 | =head2 I/O WATCHERS |
147 | |
154 | |
148 | 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 |
149 | with the following mandatory key-value pairs as arguments: |
156 | with the following mandatory key-value pairs as arguments: |
150 | |
157 | |
151 | 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 |
152 | 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> |
153 | 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 |
154 | 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 |
155 | becomes ready. |
162 | callback to invoke each time the file handle becomes ready. |
156 | |
163 | |
157 | Although the callback might get passed parameters, their value and |
164 | Although the callback might get passed parameters, their value and |
158 | presence is undefined and you cannot rely on them. Portable AnyEvent |
165 | presence is undefined and you cannot rely on them. Portable AnyEvent |
159 | callbacks cannot use arguments passed to I/O watcher callbacks. |
166 | callbacks cannot use arguments passed to I/O watcher callbacks. |
160 | |
167 | |
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164 | |
171 | |
165 | Some event loops issue spurious readyness notifications, so you should |
172 | Some event loops issue spurious readyness notifications, so you should |
166 | 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 |
167 | handles. |
174 | handles. |
168 | |
175 | |
169 | Example: |
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170 | |
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171 | # 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 | |
172 | my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
179 | my $w; $w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
173 | chomp (my $input = <STDIN>); |
180 | chomp (my $input = <STDIN>); |
174 | warn "read: $input\n"; |
181 | warn "read: $input\n"; |
175 | undef $w; |
182 | undef $w; |
176 | }); |
183 | }); |
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186 | |
193 | |
187 | Although the callback might get passed parameters, their value and |
194 | Although the callback might get passed parameters, their value and |
188 | presence is undefined and you cannot rely on them. Portable AnyEvent |
195 | presence is undefined and you cannot rely on them. Portable AnyEvent |
189 | callbacks cannot use arguments passed to time watcher callbacks. |
196 | callbacks cannot use arguments passed to time watcher callbacks. |
190 | |
197 | |
191 | 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 |
192 | 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 |
193 | 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. |
194 | |
203 | |
195 | 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. |
196 | |
207 | |
197 | # fire an event after 7.7 seconds |
208 | Example: fire an event after 7.7 seconds. |
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209 | |
198 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
210 | my $w = AnyEvent->timer (after => 7.7, cb => sub { |
199 | warn "timeout\n"; |
211 | warn "timeout\n"; |
200 | }); |
212 | }); |
201 | |
213 | |
202 | # to cancel the timer: |
214 | # to cancel the timer: |
203 | undef $w; |
215 | undef $w; |
204 | |
216 | |
205 | Example 2: |
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206 | |
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207 | # 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. |
208 | my $w; |
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209 | |
218 | |
210 | my $cb = sub { |
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211 | # cancel the old timer while creating a new one |
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212 | $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"; |
213 | }; |
221 | }; |
214 | |
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215 | # start the "loop" by creating the first watcher |
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216 | $w = AnyEvent->timer (after => 0.5, cb => $cb); |
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217 | |
222 | |
218 | =head3 TIMING ISSUES |
223 | =head3 TIMING ISSUES |
219 | |
224 | |
220 | 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 |
221 | 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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299 | =back |
304 | =back |
300 | |
305 | |
301 | =head2 SIGNAL WATCHERS |
306 | =head2 SIGNAL WATCHERS |
302 | |
307 | |
303 | 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 |
304 | 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 |
305 | be invoked whenever a signal occurs. |
310 | callback to be invoked whenever a signal occurs. |
306 | |
311 | |
307 | Although the callback might get passed parameters, their value and |
312 | Although the callback might get passed parameters, their value and |
308 | presence is undefined and you cannot rely on them. Portable AnyEvent |
313 | presence is undefined and you cannot rely on them. Portable AnyEvent |
309 | callbacks cannot use arguments passed to signal watcher callbacks. |
314 | callbacks cannot use arguments passed to signal watcher callbacks. |
310 | |
315 | |
… | |
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346 | 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 |
347 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
352 | C<fork> the child (alternatively, you can call C<AnyEvent::detect>). |
348 | |
353 | |
349 | Example: fork a process and wait for it |
354 | Example: fork a process and wait for it |
350 | |
355 | |
351 | my $done = AnyEvent->condvar; |
356 | my $done = AnyEvent->condvar; |
352 | |
357 | |
353 | my $pid = fork or exit 5; |
358 | my $pid = fork or exit 5; |
354 | |
359 | |
355 | my $w = AnyEvent->child ( |
360 | my $w = AnyEvent->child ( |
356 | pid => $pid, |
361 | pid => $pid, |
357 | cb => sub { |
362 | cb => sub { |
358 | my ($pid, $status) = @_; |
363 | my ($pid, $status) = @_; |
359 | warn "pid $pid exited with status $status"; |
364 | warn "pid $pid exited with status $status"; |
360 | $done->send; |
365 | $done->send; |
361 | }, |
366 | }, |
362 | ); |
367 | ); |
363 | |
368 | |
364 | # do something else, then wait for process exit |
369 | # do something else, then wait for process exit |
365 | $done->recv; |
370 | $done->recv; |
366 | |
371 | |
367 | =head2 CONDITION VARIABLES |
372 | =head2 CONDITION VARIABLES |
368 | |
373 | |
369 | 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 |
370 | 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 |
… | |
… | |
591 | |
596 | |
592 | 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 |
593 | replaces it before doing so. |
598 | replaces it before doing so. |
594 | |
599 | |
595 | 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 |
596 | 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 |
597 | 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. |
598 | |
604 | |
599 | =back |
605 | =back |
600 | |
606 | |
601 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
607 | =head1 GLOBAL VARIABLES AND FUNCTIONS |
602 | |
608 | |
… | |
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731 | =item L<AnyEvent::Util> |
737 | =item L<AnyEvent::Util> |
732 | |
738 | |
733 | Contains various utility functions that replace often-used but blocking |
739 | Contains various utility functions that replace often-used but blocking |
734 | functions such as C<inet_aton> by event-/callback-based versions. |
740 | functions such as C<inet_aton> by event-/callback-based versions. |
735 | |
741 | |
736 | =item L<AnyEvent::Handle> |
|
|
737 | |
|
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738 | Provide read and write buffers and manages watchers for reads and writes. |
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|
739 | |
|
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740 | =item L<AnyEvent::Socket> |
742 | =item L<AnyEvent::Socket> |
741 | |
743 | |
742 | Provides various utility functions for (internet protocol) sockets, |
744 | Provides various utility functions for (internet protocol) sockets, |
743 | addresses and name resolution. Also functions to create non-blocking tcp |
745 | addresses and name resolution. Also functions to create non-blocking tcp |
744 | 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. |
745 | |
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 | |
746 | =item L<AnyEvent::DNS> |
754 | =item L<AnyEvent::DNS> |
747 | |
755 | |
748 | Provides rich asynchronous DNS resolver capabilities. |
756 | Provides rich asynchronous DNS resolver capabilities. |
749 | |
757 | |
|
|
758 | =item L<AnyEvent::HTTP> |
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759 | |
|
|
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 | |
750 | =item L<AnyEvent::HTTPD> |
763 | =item L<AnyEvent::HTTPD> |
751 | |
764 | |
752 | Provides a simple web application server framework. |
765 | Provides a simple web application server framework. |
753 | |
766 | |
754 | =item L<AnyEvent::FastPing> |
767 | =item L<AnyEvent::FastPing> |
755 | |
768 | |
756 | The fastest ping in the west. |
769 | The fastest ping in the west. |
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770 | |
|
|
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 | |
|
|
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>). |
757 | |
794 | |
758 | =item L<Net::IRC3> |
795 | =item L<Net::IRC3> |
759 | |
796 | |
760 | AnyEvent based IRC client module family. |
797 | AnyEvent based IRC client module family. |
761 | |
798 | |
… | |
… | |
774 | |
811 | |
775 | =item L<Coro> |
812 | =item L<Coro> |
776 | |
813 | |
777 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
814 | Has special support for AnyEvent via L<Coro::AnyEvent>. |
778 | |
815 | |
779 | =item L<AnyEvent::AIO>, L<IO::AIO> |
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780 | |
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781 | Truly asynchronous I/O, should be in the toolbox of every event |
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782 | programmer. AnyEvent::AIO transparently fuses IO::AIO and AnyEvent |
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783 | together. |
|
|
784 | |
|
|
785 | =item L<AnyEvent::BDB>, L<BDB> |
|
|
786 | |
|
|
787 | Truly asynchronous Berkeley DB access. AnyEvent::AIO transparently fuses |
|
|
788 | IO::AIO and AnyEvent together. |
|
|
789 | |
|
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790 | =item L<IO::Lambda> |
816 | =item L<IO::Lambda> |
791 | |
817 | |
792 | 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. |
793 | |
819 | |
794 | =back |
820 | =back |
… | |
… | |
800 | no warnings; |
826 | no warnings; |
801 | use strict; |
827 | use strict; |
802 | |
828 | |
803 | use Carp; |
829 | use Carp; |
804 | |
830 | |
805 | our $VERSION = 4.11; |
831 | our $VERSION = 4.22; |
806 | our $MODEL; |
832 | our $MODEL; |
807 | |
833 | |
808 | our $AUTOLOAD; |
834 | our $AUTOLOAD; |
809 | our @ISA; |
835 | our @ISA; |
810 | |
836 | |
… | |
… | |
913 | $MODEL |
939 | $MODEL |
914 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib."; |
940 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib."; |
915 | } |
941 | } |
916 | } |
942 | } |
917 | |
943 | |
|
|
944 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
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|
945 | |
918 | unshift @ISA, $MODEL; |
946 | unshift @ISA, $MODEL; |
919 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
947 | |
|
|
948 | require AnyEvent::Strict if $ENV{PERL_ANYEVENT_STRICT}; |
920 | |
949 | |
921 | (shift @post_detect)->() while @post_detect; |
950 | (shift @post_detect)->() while @post_detect; |
922 | } |
951 | } |
923 | |
952 | |
924 | $MODEL |
953 | $MODEL |
… | |
… | |
932 | |
961 | |
933 | detect unless $MODEL; |
962 | detect unless $MODEL; |
934 | |
963 | |
935 | my $class = shift; |
964 | my $class = shift; |
936 | $class->$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: $!"; |
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|
983 | |
|
|
984 | # we assume CLOEXEC is already set by perl in all important cases |
|
|
985 | |
|
|
986 | ($fh2, $rw) |
937 | } |
987 | } |
938 | |
988 | |
939 | package AnyEvent::Base; |
989 | package AnyEvent::Base; |
940 | |
990 | |
941 | # default implementation for now and time |
991 | # default implementation for now and time |
… | |
… | |
972 | sub AnyEvent::Base::Signal::DESTROY { |
1022 | sub AnyEvent::Base::Signal::DESTROY { |
973 | my ($signal, $cb) = @{$_[0]}; |
1023 | my ($signal, $cb) = @{$_[0]}; |
974 | |
1024 | |
975 | delete $SIG_CB{$signal}{$cb}; |
1025 | delete $SIG_CB{$signal}{$cb}; |
976 | |
1026 | |
977 | $SIG{$signal} = 'DEFAULT' unless keys %{ $SIG_CB{$signal} }; |
1027 | delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
978 | } |
1028 | } |
979 | |
1029 | |
980 | # default implementation for ->child |
1030 | # default implementation for ->child |
981 | |
1031 | |
982 | our %PID_CB; |
1032 | our %PID_CB; |
… | |
… | |
1152 | C<PERL_ANYEVENT_MODEL>. |
1202 | C<PERL_ANYEVENT_MODEL>. |
1153 | |
1203 | |
1154 | 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 |
1155 | model it chooses. |
1205 | model it chooses. |
1156 | |
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 load C<AnyEvent::Strict> and then to thoroughly |
|
|
1212 | check the arguments passed to most method calls. If it finds any problems |
|
|
1213 | it will croak. |
|
|
1214 | |
|
|
1215 | In other words, enables "strict" mode. |
|
|
1216 | |
|
|
1217 | Unlike C<use strict> it is definitely recommended ot keep it off in |
|
|
1218 | production. |
|
|
1219 | |
1157 | =item C<PERL_ANYEVENT_MODEL> |
1220 | =item C<PERL_ANYEVENT_MODEL> |
1158 | |
1221 | |
1159 | This can be used to specify the event model to be used by AnyEvent, before |
1222 | This can be used to specify the event model to be used by AnyEvent, before |
1160 | auto detection and -probing kicks in. It must be a string consisting |
1223 | auto detection and -probing kicks in. It must be a string consisting |
1161 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
1224 | entirely of ASCII letters. The string C<AnyEvent::Impl::> gets prepended |
… | |
… | |
1166 | This functionality might change in future versions. |
1229 | This functionality might change in future versions. |
1167 | |
1230 | |
1168 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1231 | For example, to force the pure perl model (L<AnyEvent::Impl::Perl>) you |
1169 | could start your program like this: |
1232 | could start your program like this: |
1170 | |
1233 | |
1171 | PERL_ANYEVENT_MODEL=Perl perl ... |
1234 | PERL_ANYEVENT_MODEL=Perl perl ... |
1172 | |
1235 | |
1173 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1236 | =item C<PERL_ANYEVENT_PROTOCOLS> |
1174 | |
1237 | |
1175 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1238 | Used by both L<AnyEvent::DNS> and L<AnyEvent::Socket> to determine preferences |
1176 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
1239 | for IPv4 or IPv6. The default is unspecified (and might change, or be the result |
… | |
… | |
1651 | specified in the variable. |
1714 | specified in the variable. |
1652 | |
1715 | |
1653 | You can make AnyEvent completely ignore this variable by deleting it |
1716 | You can make AnyEvent completely ignore this variable by deleting it |
1654 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1717 | before the first watcher gets created, e.g. with a C<BEGIN> block: |
1655 | |
1718 | |
1656 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1719 | BEGIN { delete $ENV{PERL_ANYEVENT_MODEL} } |
1657 | |
1720 | |
1658 | use AnyEvent; |
1721 | use AnyEvent; |
1659 | |
1722 | |
1660 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1723 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1661 | be used to probe what backend is used and gain other information (which is |
1724 | be used to probe what backend is used and gain other information (which is |
1662 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL). |
1725 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and |
|
|
1726 | $ENV{PERL_ANYEGENT_STRICT}. |
|
|
1727 | |
|
|
1728 | |
|
|
1729 | =head1 BUGS |
|
|
1730 | |
|
|
1731 | Perl 5.8 has numerous memleaks that sometimes hit this module and are hard |
|
|
1732 | to work around. If you suffer from memleaks, first upgrade to Perl 5.10 |
|
|
1733 | and check wether the leaks still show up. (Perl 5.10.0 has other annoying |
|
|
1734 | mamleaks, such as leaking on C<map> and C<grep> but it is usually not as |
|
|
1735 | pronounced). |
1663 | |
1736 | |
1664 | |
1737 | |
1665 | =head1 SEE ALSO |
1738 | =head1 SEE ALSO |
1666 | |
1739 | |
1667 | Utility functions: L<AnyEvent::Util>. |
1740 | Utility functions: L<AnyEvent::Util>. |
… | |
… | |
1684 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1757 | Nontrivial usage examples: L<Net::FCP>, L<Net::XMPP2>, L<AnyEvent::DNS>. |
1685 | |
1758 | |
1686 | |
1759 | |
1687 | =head1 AUTHOR |
1760 | =head1 AUTHOR |
1688 | |
1761 | |
1689 | Marc Lehmann <schmorp@schmorp.de> |
1762 | Marc Lehmann <schmorp@schmorp.de> |
1690 | http://home.schmorp.de/ |
1763 | http://home.schmorp.de/ |
1691 | |
1764 | |
1692 | =cut |
1765 | =cut |
1693 | |
1766 | |
1694 | 1 |
1767 | 1 |
1695 | |
1768 | |