1 | NAME |
1 | NAME |
2 | EV - perl interface to libev, a high performance full-featured event |
2 | EV - perl interface to libev, a high performance full-featured event |
3 | loop |
3 | loop |
4 | |
4 | |
5 | SYNOPSIS |
5 | SYNOPSIS |
6 | use EV; |
6 | use EV; |
7 | |
7 | |
8 | # TIMERS |
8 | # TIMERS |
9 | |
9 | |
10 | my $w = EV::timer 2, 0, sub { |
10 | my $w = EV::timer 2, 0, sub { |
11 | warn "is called after 2s"; |
11 | warn "is called after 2s"; |
12 | }; |
12 | }; |
13 | |
13 | |
14 | my $w = EV::timer 2, 2, sub { |
14 | my $w = EV::timer 2, 2, sub { |
15 | warn "is called roughly every 2s (repeat = 2)"; |
15 | warn "is called roughly every 2s (repeat = 2)"; |
16 | }; |
16 | }; |
17 | |
17 | |
18 | undef $w; # destroy event watcher again |
18 | undef $w; # destroy event watcher again |
19 | |
19 | |
20 | my $w = EV::periodic 0, 60, 0, sub { |
20 | my $w = EV::periodic 0, 60, 0, sub { |
21 | warn "is called every minute, on the minute, exactly"; |
21 | warn "is called every minute, on the minute, exactly"; |
22 | }; |
22 | }; |
23 | |
23 | |
24 | # IO |
24 | # IO |
25 | |
25 | |
26 | my $w = EV::io *STDIN, EV::READ, sub { |
26 | my $w = EV::io *STDIN, EV::READ, sub { |
27 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
27 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
28 | warn "stdin is readable, you entered: ", <STDIN>; |
28 | warn "stdin is readable, you entered: ", <STDIN>; |
29 | }; |
29 | }; |
30 | |
30 | |
31 | # SIGNALS |
31 | # SIGNALS |
32 | |
32 | |
33 | my $w = EV::signal 'QUIT', sub { |
33 | my $w = EV::signal 'QUIT', sub { |
34 | warn "sigquit received\n"; |
34 | warn "sigquit received\n"; |
35 | }; |
35 | }; |
36 | |
36 | |
37 | # CHILD/PID STATUS CHANGES |
37 | # CHILD/PID STATUS CHANGES |
38 | |
38 | |
39 | my $w = EV::child 666, 0, sub { |
39 | my $w = EV::child 666, 0, sub { |
40 | my ($w, $revents) = @_; |
40 | my ($w, $revents) = @_; |
41 | my $status = $w->rstatus; |
41 | my $status = $w->rstatus; |
42 | }; |
42 | }; |
43 | |
43 | |
44 | # STAT CHANGES |
44 | # STAT CHANGES |
45 | my $w = EV::stat "/etc/passwd", 10, sub { |
45 | my $w = EV::stat "/etc/passwd", 10, sub { |
46 | my ($w, $revents) = @_; |
46 | my ($w, $revents) = @_; |
47 | warn $w->path, " has changed somehow.\n"; |
47 | warn $w->path, " has changed somehow.\n"; |
48 | }; |
48 | }; |
49 | |
49 | |
50 | # MAINLOOP |
50 | # MAINLOOP |
51 | EV::loop; # loop until EV::unloop is called or all watchers stop |
51 | EV::loop; # loop until EV::unloop is called or all watchers stop |
52 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
52 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
53 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
53 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
54 | |
54 | |
55 | DESCRIPTION |
55 | DESCRIPTION |
56 | This module provides an interface to libev |
56 | This module provides an interface to libev |
57 | (<http://software.schmorp.de/pkg/libev.html>). While the documentation |
57 | (<http://software.schmorp.de/pkg/libev.html>). While the documentation |
58 | below is comprehensive, one might also consult the documentation of |
58 | below is comprehensive, one might also consult the documentation of |
59 | libev itself (<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>) |
59 | libev itself (<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod> or |
60 | for more subtle details on watcher semantics or some discussion on the |
60 | perldoc EV::libev) for more subtle details on watcher semantics or some |
61 | available backends, or how to force a specific backend with |
61 | discussion on the available backends, or how to force a specific backend |
62 | "LIBEV_FLAGS", or just about in any case because it has much more |
62 | with "LIBEV_FLAGS", or just about in any case because it has much more |
63 | detailed information. |
63 | detailed information. |
64 | |
64 | |
65 | This module is very fast and scalable. It is actually so fast that you |
65 | This module is very fast and scalable. It is actually so fast that you |
66 | can use it through the AnyEvent module, stay portable to other event |
66 | can use it through the AnyEvent module, stay portable to other event |
67 | loops (if you don't rely on any watcher types not available through it) |
67 | loops (if you don't rely on any watcher types not available through it) |
68 | and still be faster than with any other event loop currently supported |
68 | and still be faster than with any other event loop currently supported |
69 | in Perl. |
69 | in Perl. |
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70 | |
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71 | MODULE EXPORTS |
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72 | This module does not export any symbols. |
70 | |
73 | |
71 | EVENT LOOPS |
74 | EVENT LOOPS |
72 | EV supports multiple event loops: There is a single "default event loop" |
75 | EV supports multiple event loops: There is a single "default event loop" |
73 | that can handle everything including signals and child watchers, and any |
76 | that can handle everything including signals and child watchers, and any |
74 | number of "dynamic event loops" that can use different backends (with |
77 | number of "dynamic event loops" that can use different backends (with |
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81 | default loop as this is fastest (perl-wise), best supported by other |
84 | default loop as this is fastest (perl-wise), best supported by other |
82 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
85 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
83 | |
86 | |
84 | For specific programs you can create additional event loops dynamically. |
87 | For specific programs you can create additional event loops dynamically. |
85 | |
88 | |
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89 | If you want to take advantage of kqueue (which often works properly for |
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90 | sockets only) even though the default loop doesn't enable it, you can |
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91 | *embed* a kqueue loop into the default loop: running the default loop |
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92 | will then also service the kqueue loop to some extent. See the example |
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93 | in the section about embed watchers for an example on how to achieve |
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94 | that. |
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95 | |
86 | $loop = new EV::loop [$flags] |
96 | $loop = new EV::Loop [$flags] |
87 | Create a new event loop as per the specified flags. Please refer to |
97 | Create a new event loop as per the specified flags. Please refer to |
88 | the "ev_loop_new ()" function description in the libev documentation |
98 | the "ev_loop_new ()" function description in the libev documentation |
89 | (<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTI |
99 | (<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTI |
90 | ONS>) for more info. |
100 | ONS>, or locally-installed as EV::libev manpage) for more info. |
91 | |
101 | |
92 | The loop will automatically be destroyed when it is no longer |
102 | The loop will automatically be destroyed when it is no longer |
93 | referenced by any watcher and the loop object goes out of scope. |
103 | referenced by any watcher and the loop object goes out of scope. |
94 | |
104 | |
95 | Using "EV::FLAG_FORKCHECK" is recommended, as only the default event |
105 | If you are not embedding the loop, then Using "EV::FLAG_FORKCHECK" |
96 | loop is protected by this module. |
106 | is recommended, as only the default event loop is protected by this |
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107 | module. If you *are* embedding this loop in the default loop, this |
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108 | is not necessary, as "EV::embed" automatically does the right thing |
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109 | on fork. |
97 | |
110 | |
98 | $loop->loop_fork |
111 | $loop->loop_fork |
99 | Must be called after a fork in the child, before entering or |
112 | Must be called after a fork in the child, before entering or |
100 | continuing the event loop. An alternative is to use |
113 | continuing the event loop. An alternative is to use |
101 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
114 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
102 | some performance loss (refer to the libev documentation). |
115 | some performance loss (refer to the libev documentation). |
103 | |
116 | |
104 | $loop->loop_verify |
117 | $loop->loop_verify |
105 | Calls "ev_verify" to make internal consistency checks (for debugging |
118 | Calls "ev_verify" to make internal consistency checks (for debugging |
106 | libev) and abort the program if any data structures wree found to be |
119 | libev) and abort the program if any data structures were found to be |
107 | corrupted. |
120 | corrupted. |
108 | |
121 | |
109 | $loop = EV::default_loop [$flags] |
122 | $loop = EV::default_loop [$flags] |
110 | Return the default loop (which is a singleton object). Since this |
123 | Return the default loop (which is a singleton object). Since this |
111 | module already creates the default loop with default flags, |
124 | module already creates the default loop with default flags, |
112 | specifying flags here will not have any effect unless you destroy |
125 | specifying flags here will not have any effect unless you destroy |
113 | the default loop. |
126 | the default loop first, which isn't supported. So in short: don't do |
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127 | it, and if you break it, you get to keep the pieces. |
114 | |
128 | |
115 | BASIC INTERFACE |
129 | BASIC INTERFACE |
116 | $EV::DIED |
130 | $EV::DIED |
117 | Must contain a reference to a function that is called when a |
131 | Must contain a reference to a function that is called when a |
118 | callback throws an exception (with $@ containing the error). The |
132 | callback throws an exception (with $@ containing the error). The |
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135 | Returns the current time in (fractional) seconds since the epoch. |
149 | Returns the current time in (fractional) seconds since the epoch. |
136 | |
150 | |
137 | $time = EV::now |
151 | $time = EV::now |
138 | $time = $loop->now |
152 | $time = $loop->now |
139 | Returns the time the last event loop iteration has been started. |
153 | Returns the time the last event loop iteration has been started. |
140 | This is the time that (relative) timers are based on, and refering |
154 | This is the time that (relative) timers are based on, and referring |
141 | to it is usually faster then calling EV::time. |
155 | to it is usually faster then calling EV::time. |
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156 | |
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157 | EV::now_update |
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158 | $loop->now_update |
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159 | Establishes the current time by querying the kernel, updating the |
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160 | time returned by "EV::now" in the progress. This is a costly |
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161 | operation and is usually done automatically within "EV::loop". |
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162 | |
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163 | This function is rarely useful, but when some event callback runs |
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164 | for a very long time without entering the event loop, updating |
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165 | libev's idea of the current time is a good idea. |
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166 | |
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167 | EV::suspend |
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168 | $loop->suspend |
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169 | EV::resume |
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170 | $loop->resume |
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171 | These two functions suspend and resume a loop, for use when the loop |
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172 | is not used for a while and timeouts should not be processed. |
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173 | |
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174 | A typical use case would be an interactive program such as a game: |
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175 | When the user presses "^Z" to suspend the game and resumes it an |
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176 | hour later it would be best to handle timeouts as if no time had |
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177 | actually passed while the program was suspended. This can be |
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178 | achieved by calling "suspend" in your "SIGTSTP" handler, sending |
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179 | yourself a "SIGSTOP" and calling "resume" directly afterwards to |
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180 | resume timer processing. |
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181 | |
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182 | Effectively, all "timer" watchers will be delayed by the time spend |
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183 | between "suspend" and "resume", and all "periodic" watchers will be |
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184 | rescheduled (that is, they will lose any events that would have |
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185 | occured while suspended). |
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186 | |
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187 | After calling "suspend" you must not call *any* function on the |
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188 | given loop other than "resume", and you must not call "resume" |
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189 | without a previous call to "suspend". |
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190 | |
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191 | Calling "suspend"/"resume" has the side effect of updating the event |
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192 | loop time (see "now_update"). |
142 | |
193 | |
143 | $backend = EV::backend |
194 | $backend = EV::backend |
144 | $backend = $loop->backend |
195 | $backend = $loop->backend |
145 | Returns an integer describing the backend used by libev |
196 | Returns an integer describing the backend used by libev |
146 | (EV::METHOD_SELECT or EV::METHOD_EPOLL). |
197 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
147 | |
198 | |
148 | EV::loop [$flags] |
199 | EV::loop [$flags] |
149 | $loop->loop ([$flags]) |
200 | $loop->loop ([$flags]) |
150 | Begin checking for events and calling callbacks. It returns when a |
201 | Begin checking for events and calling callbacks. It returns when a |
151 | callback calls EV::unloop. |
202 | callback calls EV::unloop. |
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165 | EV::loop will return as fast as possible. |
216 | EV::loop will return as fast as possible. |
166 | |
217 | |
167 | $count = EV::loop_count |
218 | $count = EV::loop_count |
168 | $count = $loop->loop_count |
219 | $count = $loop->loop_count |
169 | Return the number of times the event loop has polled for new events. |
220 | Return the number of times the event loop has polled for new events. |
170 | Sometiems useful as a generation counter. |
221 | Sometimes useful as a generation counter. |
171 | |
222 | |
172 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
223 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
173 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
224 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
174 | This function rolls together an I/O and a timer watcher for a single |
225 | This function rolls together an I/O and a timer watcher for a single |
175 | one-shot event without the need for managing a watcher object. |
226 | one-shot event without the need for managing a watcher object. |
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209 | $loop->set_timeout_collect_interval ($time) |
260 | $loop->set_timeout_collect_interval ($time) |
210 | These advanced functions set the minimum block interval when polling |
261 | These advanced functions set the minimum block interval when polling |
211 | for I/O events and the minimum wait interval for timer events. See |
262 | for I/O events and the minimum wait interval for timer events. See |
212 | the libev documentation at |
263 | the libev documentation at |
213 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONT |
264 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONT |
214 | ROLLING_THE_EVENT_LOOP> for a more detailed discussion. |
265 | ROLLING_THE_EVENT_LOOP> (locally installed as EV::libev) for a more |
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266 | detailed discussion. |
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267 | |
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268 | $count = EV::pending_count |
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269 | $count = $loop->pending_count |
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270 | Returns the number of currently pending watchers. |
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271 | |
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272 | EV::invoke_pending |
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273 | $loop->invoke_pending |
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274 | Invoke all currently pending watchers. |
215 | |
275 | |
216 | WATCHER OBJECTS |
276 | WATCHER OBJECTS |
217 | A watcher is an object that gets created to record your interest in some |
277 | A watcher is an object that gets created to record your interest in some |
218 | event. For instance, if you want to wait for STDIN to become readable, |
278 | event. For instance, if you want to wait for STDIN to become readable, |
219 | you would create an EV::io watcher for that: |
279 | you would create an EV::io watcher for that: |
220 | |
280 | |
221 | my $watcher = EV::io *STDIN, EV::READ, sub { |
281 | my $watcher = EV::io *STDIN, EV::READ, sub { |
222 | my ($watcher, $revents) = @_; |
282 | my ($watcher, $revents) = @_; |
223 | warn "yeah, STDIN should now be readable without blocking!\n" |
283 | warn "yeah, STDIN should now be readable without blocking!\n" |
224 | }; |
284 | }; |
225 | |
285 | |
226 | All watchers can be active (waiting for events) or inactive (paused). |
286 | All watchers can be active (waiting for events) or inactive (paused). |
227 | Only active watchers will have their callbacks invoked. All callbacks |
287 | Only active watchers will have their callbacks invoked. All callbacks |
228 | will be called with at least two arguments: the watcher and a bitmask of |
288 | will be called with at least two arguments: the watcher and a bitmask of |
229 | received events. |
289 | received events. |
230 | |
290 | |
231 | Each watcher type has its associated bit in revents, so you can use the |
291 | Each watcher type has its associated bit in revents, so you can use the |
232 | same callback for multiple watchers. The event mask is named after the |
292 | same callback for multiple watchers. The event mask is named after the |
233 | type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
293 | type, i.e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
234 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O |
294 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O |
235 | events (which can set both EV::READ and EV::WRITE bits), and EV::timer |
295 | events (which can set both EV::READ and EV::WRITE bits), and EV::timer |
236 | (which uses EV::TIMEOUT). |
296 | (which uses EV::TIMEOUT). |
237 | |
297 | |
238 | In the rare case where one wants to create a watcher but not start it at |
298 | In the rare case where one wants to create a watcher but not start it at |
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306 | the watcher isn't pending it does nothing and returns 0. |
366 | the watcher isn't pending it does nothing and returns 0. |
307 | |
367 | |
308 | $previous_state = $w->keepalive ($bool) |
368 | $previous_state = $w->keepalive ($bool) |
309 | Normally, "EV::loop" will return when there are no active watchers |
369 | Normally, "EV::loop" will return when there are no active watchers |
310 | (which is a "deadlock" because no progress can be made anymore). |
370 | (which is a "deadlock" because no progress can be made anymore). |
311 | This is convinient because it allows you to start your watchers (and |
371 | This is convenient because it allows you to start your watchers (and |
312 | your jobs), call "EV::loop" once and when it returns you know that |
372 | your jobs), call "EV::loop" once and when it returns you know that |
313 | all your jobs are finished (or they forgot to register some watchers |
373 | all your jobs are finished (or they forgot to register some watchers |
314 | for their task :). |
374 | for their task :). |
315 | |
375 | |
316 | Sometimes, however, this gets in your way, for example when the |
376 | Sometimes, however, this gets in your way, for example when the |
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323 | |
383 | |
324 | In this case you can clear the keepalive status, which means that |
384 | In this case you can clear the keepalive status, which means that |
325 | even though your watcher is active, it won't keep "EV::loop" from |
385 | even though your watcher is active, it won't keep "EV::loop" from |
326 | returning. |
386 | returning. |
327 | |
387 | |
328 | The initial value for keepalive is true (enabled), and you cna |
388 | The initial value for keepalive is true (enabled), and you can |
329 | change it any time. |
389 | change it any time. |
330 | |
390 | |
331 | Example: Register an I/O watcher for some UDP socket but do not keep |
391 | Example: Register an I/O watcher for some UDP socket but do not keep |
332 | the event loop from running just because of that watcher. |
392 | the event loop from running just because of that watcher. |
333 | |
393 | |
334 | my $udp_socket = ... |
394 | my $udp_socket = ... |
335 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
395 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
336 | $1000udp_watcher->keepalive (0); |
396 | $udp_watcher->keepalive (0); |
337 | |
397 | |
338 | $loop = $w->loop |
398 | $loop = $w->loop |
339 | Return the loop that this watcher is attached to. |
399 | Return the loop that this watcher is attached to. |
340 | |
400 | |
341 | WATCHER TYPES |
401 | WATCHER TYPES |
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507 | Return the time that the watcher is expected to trigger next. |
567 | Return the time that the watcher is expected to trigger next. |
508 | |
568 | |
509 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
569 | SIGNAL WATCHERS - signal me when a signal gets signalled! |
510 | $w = EV::signal $signal, $callback |
570 | $w = EV::signal $signal, $callback |
511 | $w = EV::signal_ns $signal, $callback |
571 | $w = EV::signal_ns $signal, $callback |
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572 | $w = $loop->signal ($signal, $callback) |
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573 | $w = $loop->signal_ns ($signal, $callback) |
512 | Call the callback when $signal is received (the signal can be |
574 | Call the callback when $signal is received (the signal can be |
513 | specified by number or by name, just as with "kill" or %SIG). |
575 | specified by number or by name, just as with "kill" or %SIG). |
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576 | |
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577 | Only one event loop can grab a given signal - attempting to grab the |
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578 | same signal from two EV loops will crash the program immediately or |
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579 | cause data corruption. |
514 | |
580 | |
515 | EV will grab the signal for the process (the kernel only allows one |
581 | EV will grab the signal for the process (the kernel only allows one |
516 | component to receive a signal at a time) when you start a signal |
582 | component to receive a signal at a time) when you start a signal |
517 | watcher, and removes it again when you stop it. Perl does the same |
583 | watcher, and removes it again when you stop it. Perl does the same |
518 | when you add/remove callbacks to %SIG, so watch out. |
584 | when you add/remove callbacks to %SIG, so watch out. |
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733 | # make the dispatcher handle any new stuff |
799 | # make the dispatcher handle any new stuff |
734 | ... not shown |
800 | ... not shown |
735 | }; |
801 | }; |
736 | |
802 | |
737 | The callbacks of the created watchers will not be called as the |
803 | The callbacks of the created watchers will not be called as the |
738 | watchers are destroyed before this cna happen (remember EV::check |
804 | watchers are destroyed before this can happen (remember EV::check |
739 | gets called first). |
805 | gets called first). |
740 | |
806 | |
741 | The "check_ns" variant doesn't start (activate) the newly created |
807 | The "check_ns" variant doesn't start (activate) the newly created |
742 | watcher. |
808 | watcher. |
743 | |
809 | |
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762 | embedded loop, other types of watchers might be handled in a delayed or |
828 | embedded loop, other types of watchers might be handled in a delayed or |
763 | incorrect fashion and must not be used). |
829 | incorrect fashion and must not be used). |
764 | |
830 | |
765 | See the libev documentation at |
831 | See the libev documentation at |
766 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code |
832 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code |
767 | _when_one_backend_> for more details. |
833 | _when_one_backend_> (locally installed as EV::libev) for more details. |
768 | |
834 | |
769 | In short, this watcher is most useful on BSD systems without working |
835 | In short, this watcher is most useful on BSD systems without working |
770 | kqueue to still be able to handle a large number of sockets: |
836 | kqueue to still be able to handle a large number of sockets: |
771 | |
837 | |
772 | my $socket_loop; |
838 | my $socket_loop; |
773 | |
839 | |
774 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
840 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
775 | if ( |
841 | if ( |
776 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
842 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
777 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
843 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
778 | ) { |
844 | ) { |
779 | # use kqueue for sockets |
845 | # use kqueue for sockets |
780 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
846 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
781 | } |
847 | } |
782 | |
848 | |
783 | # use the default loop otherwise |
849 | # use the default loop otherwise |
784 | $socket_loop ||= EV::default_loop; |
850 | $socket_loop ||= EV::default_loop; |
785 | |
851 | |
786 | $w = EV::embed $otherloop, $callback |
852 | $w = EV::embed $otherloop[, $callback] |
787 | $w = EV::embed_ns $otherloop, $callback |
853 | $w = EV::embed_ns $otherloop[, $callback] |
788 | $w = $loop->embed ($otherloop, $callback) |
854 | $w = $loop->embed ($otherloop[, $callback]) |
789 | $w = $loop->embed_ns ($otherloop, $callback) |
855 | $w = $loop->embed_ns ($otherloop[, $callback]) |
790 | Call the callback when the embedded event loop ($otherloop) has any |
856 | Call the callback when the embedded event loop ($otherloop) has any |
791 | I/O activity. The $callback should alwas be specified as "undef" in |
857 | I/O activity. The $callback is optional: if it is missing, then the |
792 | this version of EV, which means the embedded event loop will be |
858 | embedded event loop will be managed automatically (which is |
793 | managed automatically. |
859 | recommended), otherwise you have to invoke "sweep" yourself. |
794 | |
860 | |
795 | The "embed_ns" variant doesn't start (activate) the newly created |
861 | The "embed_ns" variant doesn't start (activate) the newly created |
796 | watcher. |
862 | watcher. |
797 | |
863 | |
798 | ASYNC WATCHERS - how to wake up another event loop |
864 | ASYNC WATCHERS - how to wake up another event loop |
799 | Async watchers are provided by EV, but have little use in perl directly, |
865 | Async watchers are provided by EV, but have little use in perl directly, |
800 | as perl neither supports threads nor direct access to signal handlers or |
866 | as perl neither supports threads running in parallel nor direct access |
801 | other contexts where they could be of value. |
867 | to signal handlers or other contexts where they could be of value. |
802 | |
868 | |
803 | It is, however, possible to use them from the XS level. |
869 | It is, however, possible to use them from the XS level. |
804 | |
870 | |
805 | Please see the libev documentation for further details. |
871 | Please see the libev documentation for further details. |
806 | |
872 | |
… | |
… | |
825 | my $async_check = EV::check sub { }; |
891 | my $async_check = EV::check sub { }; |
826 | |
892 | |
827 | This ensures that perl gets into control for a short time to handle any |
893 | This ensures that perl gets into control for a short time to handle any |
828 | pending signals, and also ensures (slightly) slower overall operation. |
894 | pending signals, and also ensures (slightly) slower overall operation. |
829 | |
895 | |
830 | THREADS |
896 | ITHREADS |
831 | Threads are not supported by this module in any way. Perl pseudo-threads |
897 | Ithreads are not supported by this module in any way. Perl |
832 | is evil stuff and must die. As soon as Perl gains real threads I will |
898 | pseudo-threads is evil stuff and must die. Real threads as provided by |
833 | work on thread support for it. |
899 | Coro are fully supported (and enhanced support is available via |
|
|
900 | Coro::EV). |
834 | |
901 | |
835 | FORK |
902 | FORK |
836 | Most of the "improved" event delivering mechanisms of modern operating |
903 | Most of the "improved" event delivering mechanisms of modern operating |
837 | systems have quite a few problems with fork(2) (to put it bluntly: it is |
904 | systems have quite a few problems with fork(2) (to put it bluntly: it is |
838 | not supported and usually destructive). Libev makes it possible to work |
905 | not supported and usually destructive). Libev makes it possible to work |
… | |
… | |
854 | loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines |
921 | loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines |
855 | with EV), Net::SNMP::EV (asynchronous SNMP), AnyEvent for event-loop |
922 | with EV), Net::SNMP::EV (asynchronous SNMP), AnyEvent for event-loop |
856 | agnostic and portable event driven programming. |
923 | agnostic and portable event driven programming. |
857 | |
924 | |
858 | AUTHOR |
925 | AUTHOR |
859 | Marc Lehmann <schmorp@schmorp.de> |
926 | Marc Lehmann <schmorp@schmorp.de> |
860 | http://home.schmorp.de/ |
927 | http://home.schmorp.de/ |
861 | |
928 | |