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| 2 | |
2 | |
| 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 $w = EV::signal 3, sub { |
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55 | warn "sigquit received (this is GNU/Linux, right?)\n"; |
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56 | }; |
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57 | |
| 37 | # MAINLOOP |
58 | # MAINLOOP |
| 38 | EV::dispatch; # loop as long as watchers are active |
59 | EV::dispatch; # loop as long as watchers are active |
| 39 | EV::loop; # the same thing |
60 | EV::loop; # the same thing |
| 40 | EV::loop EV::LOOP_ONCE; |
61 | EV::loop EV::LOOP_ONCE; # block until some events could be handles |
| 41 | EV::loop EV::LOOP_ONSHOT; |
62 | EV::loop EV::LOOP_NONBLOCK; # check and handle some events, but do not wait |
| 42 | |
63 | |
| 43 | =head1 DESCRIPTION |
64 | =head1 DESCRIPTION |
| 44 | |
65 | |
| 45 | This module provides an interface to libevent |
66 | This module provides an interface to libevent |
| 46 | (L<http://monkey.org/~provos/libevent/>). You probably should acquaint |
67 | (L<http://monkey.org/~provos/libevent/>). You probably should acquaint |
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… | |
| 178 | C<timer_abs> will try to tun the callback at the next possible time where |
199 | C<timer_abs> will try to tun the callback at the next possible time where |
| 179 | C<$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 | |
