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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 "nothign 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/>). |
67 | (L<http://monkey.org/~provos/libevent/>). You probably should acquaint |
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68 | yourself with its documentation and source code to be able to use this |
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69 | module fully. |
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70 | |
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71 | Please note thta this module disables the libevent EPOLL method by |
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72 | default, see BUGS, below, if you need to enable it. |
47 | |
73 | |
48 | =cut |
74 | =cut |
49 | |
75 | |
50 | package EV; |
76 | package EV; |
51 | |
77 | |
52 | use strict; |
78 | use strict; |
53 | |
79 | |
54 | BEGIN { |
80 | BEGIN { |
55 | our $VERSION = '0.01'; |
81 | our $VERSION = '0.03'; |
56 | use XSLoader; |
82 | use XSLoader; |
57 | XSLoader::load "EV", $VERSION; |
83 | XSLoader::load "EV", $VERSION; |
58 | } |
84 | } |
59 | |
85 | |
60 | =head1 FUNCTIONAL INTERFACE |
86 | =head1 BASIC INTERFACE |
61 | |
87 | |
62 | =over 4 |
88 | =over 4 |
63 | |
89 | |
64 | =item $EV::NPRI |
90 | =item $EV::NPRI |
65 | |
91 | |
66 | How many priority levels are available. |
92 | How many priority levels are available. |
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93 | |
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94 | =item $EV::DIED |
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95 | |
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96 | Must contain a reference to a function that is called when a callback |
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97 | throws an exception (with $@ containing thr error). The default prints an |
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98 | informative message and continues. |
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99 | |
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100 | If this callback throws an exception it will be silently ignored. |
67 | |
101 | |
68 | =item $time = EV::now |
102 | =item $time = EV::now |
69 | |
103 | |
70 | Returns the time in (fractional) seconds since the epoch. |
104 | Returns the time in (fractional) seconds since the epoch. |
71 | |
105 | |
… | |
… | |
96 | |
130 | |
97 | As long as the returned watcher object is alive, call the C<$callback> |
131 | As long as the returned watcher object is alive, call the C<$callback> |
98 | when the events specified in C<$eventmask> happen. Initially, the timeout |
132 | when the events specified in C<$eventmask> happen. Initially, the timeout |
99 | is disabled. |
133 | is disabled. |
100 | |
134 | |
101 | The C<io_ns> variant doesn't add/start the newly created watcher. |
135 | You can additionall set a timeout to occur on the watcher, but note that |
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136 | this timeout will not be reset when you get an I/O event in the EV::PERSIST |
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137 | case, and reaching a timeout will always stop the watcher even in the |
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138 | EV::PERSIST case. |
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139 | |
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140 | If you want a timeout to occur only after a specific time of inactivity, set |
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141 | a repeating timeout and do NOT use EV::PERSIST. |
102 | |
142 | |
103 | Eventmask can be one or more of these constants ORed together: |
143 | Eventmask can be one or more of these constants ORed together: |
104 | |
144 | |
105 | EV::READ wait until read() wouldn't block anymore |
145 | EV::READ wait until read() wouldn't block anymore |
106 | EV::WRITE wait until write() wouldn't block anymore |
146 | EV::WRITE wait until write() wouldn't block anymore |
107 | EV::PERSIST stay active after an event occured |
147 | EV::PERSIST stay active after a (non-timeout) event occured |
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148 | |
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149 | The C<io_ns> variant doesn't add/start the newly created watcher. |
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150 | |
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151 | =item my $w = EV::timed_io $fileno_or_fh, $eventmask, $timeout, $callback |
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152 | |
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153 | =item my $w = EV::timed_io_ns $fileno_or_fh, $eventmask, $timeout, $callback |
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154 | |
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155 | Same as C<io> and C<io_ns>, but also specifies a timeout (as if there was |
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156 | a call to C<< $w->timeout ($timout, 1) >>. The persist flag is not allowed |
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157 | and will automatically be cleared. The watcher will be restarted after each event. |
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158 | |
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159 | If the timeout is zero or undef, no timeout will be set, and a normal |
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160 | watcher (with the persist flag set!) will be created. |
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161 | |
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162 | This has the effect of timing out after the specified period of inactivity |
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163 | has happened. |
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164 | |
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165 | Due to the design of libevent, this is also relatively inefficient, having |
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166 | one or two io watchers and a separate timeout watcher that you reset on |
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167 | activity (by calling its C<start> method) is usually more efficient. |
108 | |
168 | |
109 | =item my $w = EV::timer $after, $repeat, $callback |
169 | =item my $w = EV::timer $after, $repeat, $callback |
110 | |
170 | |
111 | =item my $w = EV::timer_ns $after, $repeat, $callback |
171 | =item my $w = EV::timer_ns $after, $repeat, $callback |
112 | |
172 | |
… | |
… | |
133 | |
193 | |
134 | This can be used to schedule a callback to run at very regular intervals, |
194 | This can be used to schedule a callback to run at very regular intervals, |
135 | as long as the processing time is less then the interval (otherwise |
195 | as long as the processing time is less then the interval (otherwise |
136 | obviously events will be skipped). |
196 | obviously events will be skipped). |
137 | |
197 | |
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198 | Another way to think about it (for the mathematically inclined) is that |
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199 | C<timer_abs> will try to tun the callback at the next possible time where |
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200 | C<$time = $at (mod $interval)>, regardless of any time jumps. |
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201 | |
138 | 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. |
139 | |
203 | |
140 | =item my $w = EV::signal $signum, $callback |
204 | =item my $w = EV::signal $signal, $callback |
141 | |
205 | |
142 | =item my $w = EV::signal_ns $signum, $callback |
206 | =item my $w = EV::signal_ns $signal, $callback |
143 | |
207 | |
144 | 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. |
145 | |
219 | |
146 | 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. |
147 | |
221 | |
148 | =back |
222 | =back |
149 | |
223 | |
… | |
… | |
177 | |
251 | |
178 | =item $current_fh = $w->fh |
252 | =item $current_fh = $w->fh |
179 | |
253 | |
180 | =item $old_fh = $w->fh ($new_fh) |
254 | =item $old_fh = $w->fh ($new_fh) |
181 | |
255 | |
182 | Returns the previously set filehandle and optionally set a new one. |
256 | Returns the previously set filehandle and optionally set a new one (also |
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257 | clears the EV::SIGNAL flag when setting a filehandle). |
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258 | |
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259 | =item $current_signal = $w->signal |
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260 | |
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261 | =item $old_signal = $w->signal ($new_signal) |
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262 | |
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263 | Returns the previously set signal number and optionally set a new one (also sets |
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264 | the EV::SIGNAL flag when setting a signal). |
183 | |
265 | |
184 | =item $current_eventmask = $w->events |
266 | =item $current_eventmask = $w->events |
185 | |
267 | |
186 | =item $old_eventmask = $w->events ($new_eventmask) |
268 | =item $old_eventmask = $w->events ($new_eventmask) |
187 | |
269 | |
… | |
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198 | =item $w->priority_set ($priority) |
280 | =item $w->priority_set ($priority) |
199 | |
281 | |
200 | 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). |
201 | |
283 | |
202 | =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. |
203 | |
290 | |
204 | =head1 BUGS |
291 | =head1 BUGS |
205 | |
292 | |
206 | 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 |
207 | is quite new at the moment. |
294 | is quite new at the moment. |
208 | |
295 | |
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296 | Please note that the epoll method is not, in general, reliable in programs |
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297 | that use fork (even if no libveent calls are being made in the forked |
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298 | process). If your program behaves erratically, try setting the environment |
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299 | variable C<EVENT_NOEPOLL> first when running the program. |
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300 | |
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301 | In general, if you fork, then you can only use the EV module in one of the |
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302 | children. |
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303 | |
209 | =cut |
304 | =cut |
210 | |
305 | |
211 | our $NPRI = 4; |
306 | our $DIED = sub { |
212 | our $BASE = init; |
307 | warn "EV: error in callback (ignoring): $@"; |
213 | priority_init $NPRI; |
308 | }; |
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309 | |
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310 | init; |
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311 | |
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312 | push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"]; |
214 | |
313 | |
215 | 1; |
314 | 1; |
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315 | |
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316 | =head1 SEE ALSO |
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317 | |
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318 | L<EV::DNS>, L<event(3)>, L<event.h>, L<evdns.h>. |
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319 | L<EV::AnyEvent>. |
216 | |
320 | |
217 | =head1 AUTHOR |
321 | =head1 AUTHOR |
218 | |
322 | |
219 | Marc Lehmann <schmorp@schmorp.de> |
323 | Marc Lehmann <schmorp@schmorp.de> |
220 | http://home.schmorp.de/ |
324 | http://home.schmorp.de/ |