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3 | EV - perl interface to libevent, monkey.org/~provos/libevent/ |
3 | EV - perl interface to libevent, monkey.org/~provos/libevent/ |
4 | |
4 | |
5 | =head1 SYNOPSIS |
5 | =head1 SYNOPSIS |
6 | |
6 | |
7 | use EV; |
7 | use EV; |
8 | |
8 | |
9 | # TIMER |
9 | # TIMER |
10 | |
10 | |
11 | my $w = EV::timer 2, 0, sub { |
11 | my $w = EV::timer 2, 0, sub { |
12 | warn "is called after 2s"; |
12 | warn "is called after 2s"; |
13 | }; |
13 | }; |
14 | |
14 | |
15 | my $w = EV::timer 2, 1, sub { |
15 | my $w = EV::timer 2, 1, sub { |
16 | warn "is called roughly every 2s (repeat = 1)"; |
16 | warn "is called roughly every 2s (repeat = 1)"; |
17 | }; |
17 | }; |
18 | |
18 | |
19 | undef $w; # destroy event watcher again |
19 | undef $w; # destroy event watcher again |
20 | |
20 | |
21 | # IO |
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22 | |
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23 | my $w = EV::timer_abs 0, 60, sub { |
21 | my $w = EV::timer_abs 0, 60, sub { |
24 | warn "is called every minute, on the minute, exactly"; |
22 | warn "is called every minute, on the minute, exactly"; |
25 | }; |
23 | }; |
26 | |
24 | |
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25 | # IO |
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26 | |
27 | my $w = EV::io \*STDIN, EV::READ | EV::PERSIST, sub { |
27 | my $w = EV::io \*STDIN, EV::READ | EV::PERSIST, sub { |
28 | my ($w, $events) = @_; # all callbacks get the watcher object and event mask |
28 | my ($w, $events) = @_; # all callbacks get the watcher object and event mask |
29 | if ($events & EV::TIMEOUT) { |
29 | if ($events & EV::TIMEOUT) { |
30 | warn "nothing received on stdin for 10 seconds, retrying"; |
30 | warn "nothing received on stdin for 10 seconds, retrying"; |
31 | } else { |
31 | } else { |
32 | warn "stdin is readable, you entered: ", <STDIN>; |
32 | warn "stdin is readable, you entered: ", <STDIN>; |
33 | } |
33 | } |
34 | }; |
34 | }; |
35 | $w->timeout (10); |
35 | $w->timeout (10); |
36 | |
36 | |
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37 | my $w = EV::timed_io \*STDIN, EV::READ, 30, sub { |
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38 | my ($w, $events) = @_; |
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39 | if ($_[1] & EV::TIMEOUT) { |
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40 | warn "nothing entered within 30 seconds, bye bye.\n"; |
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41 | $w->stop; |
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42 | } else { |
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43 | my $line = <STDIN>; |
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44 | warn "you entered something, you again have 30 seconds.\n"; |
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45 | } |
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46 | }; |
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47 | |
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48 | # SIGNALS |
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49 | |
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50 | my $w = EV::signal 'QUIT', sub { |
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51 | warn "sigquit received\n"; |
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52 | }; |
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53 | |
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54 | my $w = EV::signal 3, sub { |
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55 | warn "sigquit received (this is GNU/Linux, right?)\n"; |
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56 | }; |
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57 | |
37 | # MAINLOOP |
58 | # MAINLOOP |
38 | EV::dispatch; # loop as long as watchers are active |
59 | EV::dispatch; # loop as long as watchers are active |
39 | EV::loop; # the same thing |
60 | EV::loop; # the same thing |
40 | EV::loop EV::LOOP_ONCE; |
61 | EV::loop EV::LOOP_ONCE; # block until some events could be handles |
41 | EV::loop EV::LOOP_ONSHOT; |
62 | EV::loop EV::LOOP_NONBLOCK; # check and handle some events, but do not wait |
42 | |
63 | |
43 | =head1 DESCRIPTION |
64 | =head1 DESCRIPTION |
44 | |
65 | |
45 | This module provides an interface to libevent |
66 | This module provides an interface to libevent |
46 | (L<http://monkey.org/~provos/libevent/>). You probably should acquaint |
67 | (L<http://monkey.org/~provos/libevent/>). You probably should acquaint |
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55 | package EV; |
76 | package EV; |
56 | |
77 | |
57 | use strict; |
78 | use strict; |
58 | |
79 | |
59 | BEGIN { |
80 | BEGIN { |
60 | our $VERSION = '0.02'; |
81 | our $VERSION = '0.03'; |
61 | use XSLoader; |
82 | use XSLoader; |
62 | XSLoader::load "EV", $VERSION; |
83 | XSLoader::load "EV", $VERSION; |
63 | } |
84 | } |
64 | |
85 | |
65 | =head1 BASIC INTERFACE |
86 | =head1 BASIC INTERFACE |
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178 | C<timer_abs> will try to tun the callback at the next possible time where |
199 | C<timer_abs> will try to tun the callback at the next possible time where |
179 | C<$time = $at (mod $interval)>, regardless of any time jumps. |
200 | C<$time = $at (mod $interval)>, regardless of any time jumps. |
180 | |
201 | |
181 | The C<timer_abs_ns> variant doesn't add/start the newly created watcher. |
202 | The C<timer_abs_ns> variant doesn't add/start the newly created watcher. |
182 | |
203 | |
183 | =item my $w = EV::signal $signum, $callback |
204 | =item my $w = EV::signal $signal, $callback |
184 | |
205 | |
185 | =item my $w = EV::signal_ns $signum, $callback |
206 | =item my $w = EV::signal_ns $signal, $callback |
186 | |
207 | |
187 | Call the callback when signal $signum is received. |
208 | Call the callback when $signal is received (the signal can be specified |
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209 | by number or by name, just as with kill or %SIG). Signal watchers are |
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210 | persistent no natter what. |
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211 | |
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212 | EV will grab the signal for the process (the kernel only allows one |
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213 | component to receive signals) when you start a signal watcher, and |
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214 | removes it again when you stop it. Pelr does the same when you add/remove |
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215 | callbacks to %SIG, so watch out. |
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216 | |
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217 | Unfortunately, only one handler can be registered per signal. Screw |
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218 | libevent. |
188 | |
219 | |
189 | The C<signal_ns> variant doesn't add/start the newly created watcher. |
220 | The C<signal_ns> variant doesn't add/start the newly created watcher. |
190 | |
221 | |
191 | =back |
222 | =back |
192 | |
223 | |
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249 | =item $w->priority_set ($priority) |
280 | =item $w->priority_set ($priority) |
250 | |
281 | |
251 | Set the priority of the watcher to C<$priority> (0 <= $priority < $EV::NPRI). |
282 | Set the priority of the watcher to C<$priority> (0 <= $priority < $EV::NPRI). |
252 | |
283 | |
253 | =back |
284 | =back |
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285 | |
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286 | =head1 THREADS |
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287 | |
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288 | Threads are not supported by this in any way. Perl pseudo-threads is evil |
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289 | and must die. |
254 | |
290 | |
255 | =head1 BUGS |
291 | =head1 BUGS |
256 | |
292 | |
257 | Lots. Libevent itself isn't well tested and rather buggy, and this module |
293 | Lots. Libevent itself isn't well tested and rather buggy, and this module |
258 | is quite new at the moment. |
294 | is quite new at the moment. |