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, 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://cvs.schmorp.de/libev/ev.html>) for more subtle |
59 | libev itself (<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod> or |
60 | details on watcher semantics or some discussion on the available |
60 | perldoc EV::libev) for more subtle details on watcher semantics or some |
61 | backends, or how to force a specific backend with "LIBEV_FLAGS", or just |
61 | discussion on the available backends, or how to force a specific backend |
62 | about in any case because it has much more detailed information. |
62 | with "LIBEV_FLAGS", or just about in any case because it has much more |
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63 | detailed information. |
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64 | |
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65 | This module is very fast and scalable. It is actually so fast that you |
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66 | can use it through the AnyEvent module, stay portable to other event |
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67 | loops (if you don't rely on any watcher types not available through it) |
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68 | and still be faster than with any other event loop currently supported |
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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. |
63 | |
73 | |
64 | EVENT LOOPS |
74 | EVENT LOOPS |
65 | 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" |
66 | that can handle everything including signals and child watchers, and any |
76 | that can handle everything including signals and child watchers, and any |
67 | 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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72 | selecting a working backend (which for example rules out kqueue on most |
82 | selecting a working backend (which for example rules out kqueue on most |
73 | BSDs). Modules should, unless they have "special needs" always use the |
83 | BSDs). Modules should, unless they have "special needs" always use the |
74 | 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 |
75 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
85 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
76 | |
86 | |
77 | For specific programs you cna create additional event loops dynamically. |
87 | For specific programs you can create additional event loops dynamically. |
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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. |
78 | |
95 | |
79 | $loop = new EV::loop [$flags] |
96 | $loop = new EV::loop [$flags] |
80 | 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 |
81 | the "ev_loop_new ()" function description in the libev documentation |
98 | the "ev_loop_new ()" function description in the libev documentation |
82 | (<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 |
83 | ONS>) for more info. |
100 | ONS>, or locally-installed as EV::libev manpage) for more info. |
84 | |
101 | |
85 | The loop will automatically be destroyed when it is no longer |
102 | The loop will automatically be destroyed when it is no longer |
86 | 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. |
87 | |
104 | |
88 | Using "EV::FLAG_FORKCHECK" is recommended, as only the default event |
105 | If you are not embedding the loop, then Using "EV::FLAG_FORKCHECK" |
89 | 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. |
90 | |
110 | |
91 | $loop->loop_fork |
111 | $loop->loop_fork |
92 | 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 |
93 | continuing the event loop. An alternative is to use |
113 | continuing the event loop. An alternative is to use |
94 | "EV::FLAG_FORKCHECK" which calls this fucntion automatically, at |
114 | "EV::FLAG_FORKCHECK" which calls this function automatically, at |
95 | some performance loss (refer to the libev documentation). |
115 | some performance loss (refer to the libev documentation). |
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116 | |
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117 | $loop->loop_verify |
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118 | Calls "ev_verify" to make internal consistency checks (for debugging |
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119 | libev) and abort the program if any data structures were found to be |
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120 | corrupted. |
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121 | |
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122 | $loop = EV::default_loop [$flags] |
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123 | Return the default loop (which is a singleton object). Since this |
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124 | module already creates the default loop with default flags, |
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125 | specifying flags here will not have any effect unless you destroy |
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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. |
96 | |
128 | |
97 | BASIC INTERFACE |
129 | BASIC INTERFACE |
98 | $EV::DIED |
130 | $EV::DIED |
99 | 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 |
100 | callback throws an exception (with $@ containing the error). The |
132 | callback throws an exception (with $@ containing the error). The |
101 | default prints an informative message and continues. |
133 | default prints an informative message and continues. |
102 | |
134 | |
103 | If this callback throws an exception it will be silently ignored. |
135 | If this callback throws an exception it will be silently ignored. |
104 | |
136 | |
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137 | $flags = EV::supported_backends |
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138 | $flags = EV::recommended_backends |
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139 | $flags = EV::embeddable_backends |
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140 | Returns the set (see "EV::BACKEND_*" flags) of backends supported by |
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141 | this instance of EV, the set of recommended backends (supposed to be |
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142 | good) for this platform and the set of embeddable backends (see |
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143 | EMBED WATCHERS). |
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144 | |
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145 | EV::sleep $seconds |
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146 | Block the process for the given number of (fractional) seconds. |
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147 | |
105 | $time = EV::time |
148 | $time = EV::time |
106 | Returns the current time in (fractional) seconds since the epoch. |
149 | Returns the current time in (fractional) seconds since the epoch. |
107 | |
150 | |
108 | $time = EV::now |
151 | $time = EV::now |
109 | $time = $loop->now |
152 | $time = $loop->now |
110 | Returns the time the last event loop iteration has been started. |
153 | Returns the time the last event loop iteration has been started. |
111 | 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 |
112 | to it is usually faster then calling EV::time. |
155 | to it is usually faster then calling EV::time. |
113 | |
156 | |
114 | $backend = EV::backend |
157 | $backend = EV::backend |
115 | $backend = $loop->backend |
158 | $backend = $loop->backend |
116 | Returns an integer describing the backend used by libev |
159 | Returns an integer describing the backend used by libev |
117 | (EV::METHOD_SELECT or EV::METHOD_EPOLL). |
160 | (EV::BACKEND_SELECT or EV::BACKEND_EPOLL). |
118 | |
161 | |
119 | EV::loop [$flags] |
162 | EV::loop [$flags] |
120 | $loop->loop ([$flags]) |
163 | $loop->loop ([$flags]) |
121 | Begin checking for events and calling callbacks. It returns when a |
164 | Begin checking for events and calling callbacks. It returns when a |
122 | callback calls EV::unloop. |
165 | callback calls EV::unloop. |
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136 | EV::loop will return as fast as possible. |
179 | EV::loop will return as fast as possible. |
137 | |
180 | |
138 | $count = EV::loop_count |
181 | $count = EV::loop_count |
139 | $count = $loop->loop_count |
182 | $count = $loop->loop_count |
140 | Return the number of times the event loop has polled for new events. |
183 | Return the number of times the event loop has polled for new events. |
141 | Sometiems useful as a generation counter. |
184 | Sometimes useful as a generation counter. |
142 | |
185 | |
143 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
186 | EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
144 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
187 | $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
145 | This function rolls together an I/O and a timer watcher for a single |
188 | This function rolls together an I/O and a timer watcher for a single |
146 | one-shot event without the need for managing a watcher object. |
189 | one-shot event without the need for managing a watcher object. |
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172 | |
215 | |
173 | EV::feed_signal_event ($signal) |
216 | EV::feed_signal_event ($signal) |
174 | Feed a signal event into EV. EV will react to this call as if the |
217 | Feed a signal event into EV. EV will react to this call as if the |
175 | signal specified by $signal had occured. |
218 | signal specified by $signal had occured. |
176 | |
219 | |
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220 | EV::set_io_collect_interval $time |
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221 | $loop->set_io_collect_interval ($time) |
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222 | EV::set_timeout_collect_interval $time |
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223 | $loop->set_timeout_collect_interval ($time) |
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224 | These advanced functions set the minimum block interval when polling |
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225 | for I/O events and the minimum wait interval for timer events. See |
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226 | the libev documentation at |
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227 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONT |
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228 | ROLLING_THE_EVENT_LOOP> (locally installed as EV::libev) for a more |
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229 | detailed discussion. |
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230 | |
177 | WATCHER OBJECTS |
231 | WATCHER OBJECTS |
178 | A watcher is an object that gets created to record your interest in some |
232 | A watcher is an object that gets created to record your interest in some |
179 | event. For instance, if you want to wait for STDIN to become readable, |
233 | event. For instance, if you want to wait for STDIN to become readable, |
180 | you would create an EV::io watcher for that: |
234 | you would create an EV::io watcher for that: |
181 | |
235 | |
182 | my $watcher = EV::io *STDIN, EV::READ, sub { |
236 | my $watcher = EV::io *STDIN, EV::READ, sub { |
183 | my ($watcher, $revents) = @_; |
237 | my ($watcher, $revents) = @_; |
184 | warn "yeah, STDIN should now be readable without blocking!\n" |
238 | warn "yeah, STDIN should now be readable without blocking!\n" |
185 | }; |
239 | }; |
186 | |
240 | |
187 | All watchers can be active (waiting for events) or inactive (paused). |
241 | All watchers can be active (waiting for events) or inactive (paused). |
188 | Only active watchers will have their callbacks invoked. All callbacks |
242 | Only active watchers will have their callbacks invoked. All callbacks |
189 | will be called with at least two arguments: the watcher and a bitmask of |
243 | will be called with at least two arguments: the watcher and a bitmask of |
190 | received events. |
244 | received events. |
191 | |
245 | |
192 | Each watcher type has its associated bit in revents, so you can use the |
246 | Each watcher type has its associated bit in revents, so you can use the |
193 | same callback for multiple watchers. The event mask is named after the |
247 | same callback for multiple watchers. The event mask is named after the |
194 | type, i..e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
248 | type, i.e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
195 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O |
249 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O |
196 | events (which can set both EV::READ and EV::WRITE bits), and EV::timer |
250 | events (which can set both EV::READ and EV::WRITE bits), and EV::timer |
197 | (which uses EV::TIMEOUT). |
251 | (which uses EV::TIMEOUT). |
198 | |
252 | |
199 | In the rare case where one wants to create a watcher but not start it at |
253 | In the rare case where one wants to create a watcher but not start it at |
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284 | |
338 | |
285 | In this case you can clear the keepalive status, which means that |
339 | In this case you can clear the keepalive status, which means that |
286 | even though your watcher is active, it won't keep "EV::loop" from |
340 | even though your watcher is active, it won't keep "EV::loop" from |
287 | returning. |
341 | returning. |
288 | |
342 | |
289 | The initial value for keepalive is true (enabled), and you cna |
343 | The initial value for keepalive is true (enabled), and you can |
290 | change it any time. |
344 | change it any time. |
291 | |
345 | |
292 | Example: Register an I/O watcher for some UDP socket but do not keep |
346 | Example: Register an I/O watcher for some UDP socket but do not keep |
293 | the event loop from running just because of that watcher. |
347 | the event loop from running just because of that watcher. |
294 | |
348 | |
295 | my $udp_socket = ... |
349 | my $udp_socket = ... |
296 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
350 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
297 | $1000udp_watcher->keepalive (0); |
351 | $udp_watcher->keepalive (0); |
298 | |
352 | |
299 | $loop = $w->loop |
353 | $loop = $w->loop |
300 | Return the loop that this watcher is attached to. |
354 | Return the loop that this watcher is attached to. |
301 | |
355 | |
302 | WATCHER TYPES |
356 | WATCHER TYPES |
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390 | changed by explicit date -s or other means such as ntpd). It is also |
444 | changed by explicit date -s or other means such as ntpd). It is also |
391 | the most complex watcher type in EV. |
445 | the most complex watcher type in EV. |
392 | |
446 | |
393 | It has three distinct "modes": |
447 | It has three distinct "modes": |
394 | |
448 | |
395 | * absolute timer ($interval = $reschedule_cb = 0) |
449 | * absolute timer ($interval = $reschedule_cb = 0) |
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450 | |
396 | This time simply fires at the wallclock time $at and doesn't |
451 | This time simply fires at the wallclock time $at and doesn't |
397 | repeat. It will not adjust when a time jump occurs, that is, if |
452 | repeat. It will not adjust when a time jump occurs, that is, if |
398 | it is to be run at January 1st 2011 then it will run when the |
453 | it is to be run at January 1st 2011 then it will run when the |
399 | system time reaches or surpasses this time. |
454 | system time reaches or surpasses this time. |
400 | |
455 | |
401 | * non-repeating interval timer ($interval > 0, $reschedule_cb = 0) |
456 | * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
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457 | |
402 | In this mode the watcher will always be scheduled to time out at |
458 | In this mode the watcher will always be scheduled to time out at |
403 | the next "$at + N * $interval" time (for some integer N) and |
459 | the next "$at + N * $interval" time (for some integer N) and |
404 | then repeat, regardless of any time jumps. |
460 | then repeat, regardless of any time jumps. |
405 | |
461 | |
406 | This can be used to create timers that do not drift with respect |
462 | This can be used to create timers that do not drift with respect |
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415 | Another way to think about it (for the mathematically inclined) |
471 | Another way to think about it (for the mathematically inclined) |
416 | is that EV::periodic will try to run the callback in this mode |
472 | is that EV::periodic will try to run the callback in this mode |
417 | at the next possible time where "$time = $at (mod $interval)", |
473 | at the next possible time where "$time = $at (mod $interval)", |
418 | regardless of any time jumps. |
474 | regardless of any time jumps. |
419 | |
475 | |
420 | * manual reschedule mode ($reschedule_cb = coderef) |
476 | * manual reschedule mode ($reschedule_cb = coderef) |
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477 | |
421 | In this mode $interval and $at are both being ignored. Instead, |
478 | In this mode $interval and $at are both being ignored. Instead, |
422 | each time the periodic watcher gets scheduled, the reschedule |
479 | each time the periodic watcher gets scheduled, the reschedule |
423 | callback ($reschedule_cb) will be called with the watcher as |
480 | callback ($reschedule_cb) will be called with the watcher as |
424 | first, and the current time as second argument. |
481 | first, and the current time as second argument. |
425 | |
482 | |
426 | *This callback MUST NOT stop or destroy this or any other |
483 | *This callback MUST NOT stop or destroy this or any other |
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484 | periodic watcher, ever, and MUST NOT call any event loop |
427 | periodic watcher, ever*. If you need to stop it, return 1e30 and |
485 | functions or methods*. If you need to stop it, return 1e30 and |
428 | stop it afterwards. |
486 | stop it afterwards. You may create and start a "EV::prepare" |
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487 | watcher for this task. |
429 | |
488 | |
430 | It must return the next time to trigger, based on the passed |
489 | It must return the next time to trigger, based on the passed |
431 | time value (that is, the lowest time value larger than to the |
490 | time value (that is, the lowest time value larger than or equal |
432 | second argument). It will usually be called just before the |
491 | to to the second argument). It will usually be called just |
433 | callback will be triggered, but might be called at other times, |
492 | before the callback will be triggered, but might be called at |
434 | too. |
493 | other times, too. |
435 | |
494 | |
436 | This can be used to create very complex timers, such as a timer |
495 | This can be used to create very complex timers, such as a timer |
437 | that triggers on each midnight, local time (actually 24 hours |
496 | that triggers on each midnight, local time (actually 24 hours |
438 | after the last midnight, to keep the example simple. If you know |
497 | after the last midnight, to keep the example simple. If you know |
439 | a way to do it correctly in about the same space (without |
498 | a way to do it correctly in about the same space (without |
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486 | $old_signum = $w->signal ($new_signal) |
545 | $old_signum = $w->signal ($new_signal) |
487 | Returns the previously set signal (always as a number not name) and |
546 | Returns the previously set signal (always as a number not name) and |
488 | optionally set a new one. |
547 | optionally set a new one. |
489 | |
548 | |
490 | CHILD WATCHERS - watch out for process status changes |
549 | CHILD WATCHERS - watch out for process status changes |
491 | $w = EV::child $pid, $callback |
550 | $w = EV::child $pid, $trace, $callback |
492 | $w = EV::child_ns $pid, $callback |
551 | $w = EV::child_ns $pid, $trace, $callback |
493 | $w = $loop->child ($pid, $callback) |
552 | $w = $loop->child ($pid, $trace, $callback) |
494 | $w = $loop->child_ns ($pid, $callback) |
553 | $w = $loop->child_ns ($pid, $trace, $callback) |
495 | Call the callback when a status change for pid $pid (or any pid if |
554 | Call the callback when a status change for pid $pid (or any pid if |
496 | $pid is 0) has been received. More precisely: when the process |
555 | $pid is 0) has been received (a status change happens when the |
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556 | process terminates or is killed, or, when trace is true, |
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557 | additionally when it is stopped or continued). More precisely: when |
497 | receives a "SIGCHLD", EV will fetch the outstanding exit/wait status |
558 | the process receives a "SIGCHLD", EV will fetch the outstanding |
498 | for all changed/zombie children and call the callback. |
559 | exit/wait status for all changed/zombie children and call the |
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560 | callback. |
499 | |
561 | |
500 | It is valid (and fully supported) to install a child watcher after a |
562 | It is valid (and fully supported) to install a child watcher after a |
501 | child has exited but before the event loop has started its next |
563 | child has exited but before the event loop has started its next |
502 | iteration (for example, first you "fork", then the new child process |
564 | iteration (for example, first you "fork", then the new child process |
503 | might exit, and only then do you install a child watcher in the |
565 | might exit, and only then do you install a child watcher in the |
… | |
… | |
510 | be called. |
572 | be called. |
511 | |
573 | |
512 | The "child_ns" variant doesn't start (activate) the newly created |
574 | The "child_ns" variant doesn't start (activate) the newly created |
513 | watcher. |
575 | watcher. |
514 | |
576 | |
515 | $w->set ($pid) |
577 | $w->set ($pid, $trace) |
516 | Reconfigures the watcher, see the constructor above for details. Can |
578 | Reconfigures the watcher, see the constructor above for details. Can |
517 | be called at any time. |
579 | be called at any time. |
518 | |
580 | |
519 | $current_pid = $w->pid |
581 | $current_pid = $w->pid |
520 | $old_pid = $w->pid ($new_pid) |
|
|
521 | Returns the previously set process id and optionally set a new one. |
582 | Returns the previously set process id and optionally set a new one. |
522 | |
583 | |
523 | $exit_status = $w->rstatus |
584 | $exit_status = $w->rstatus |
524 | Return the exit/wait status (as returned by waitpid, see the waitpid |
585 | Return the exit/wait status (as returned by waitpid, see the waitpid |
525 | entry in perlfunc). |
586 | entry in perlfunc). |
… | |
… | |
687 | # make the dispatcher handle any new stuff |
748 | # make the dispatcher handle any new stuff |
688 | ... not shown |
749 | ... not shown |
689 | }; |
750 | }; |
690 | |
751 | |
691 | The callbacks of the created watchers will not be called as the |
752 | The callbacks of the created watchers will not be called as the |
692 | watchers are destroyed before this cna happen (remember EV::check |
753 | watchers are destroyed before this can happen (remember EV::check |
693 | gets called first). |
754 | gets called first). |
694 | |
755 | |
695 | The "check_ns" variant doesn't start (activate) the newly created |
756 | The "check_ns" variant doesn't start (activate) the newly created |
696 | watcher. |
757 | watcher. |
697 | |
758 | |
… | |
… | |
708 | process after a fork. |
769 | process after a fork. |
709 | |
770 | |
710 | The "fork_ns" variant doesn't start (activate) the newly created |
771 | The "fork_ns" variant doesn't start (activate) the newly created |
711 | watcher. |
772 | watcher. |
712 | |
773 | |
|
|
774 | EMBED WATCHERS - when one backend isn't enough... |
|
|
775 | This is a rather advanced watcher type that lets you embed one event |
|
|
776 | loop into another (currently only IO events are supported in the |
|
|
777 | embedded loop, other types of watchers might be handled in a delayed or |
|
|
778 | incorrect fashion and must not be used). |
|
|
779 | |
|
|
780 | See the libev documentation at |
|
|
781 | <http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code |
|
|
782 | _when_one_backend_> (locally installed as EV::libev) for more details. |
|
|
783 | |
|
|
784 | In short, this watcher is most useful on BSD systems without working |
|
|
785 | kqueue to still be able to handle a large number of sockets: |
|
|
786 | |
|
|
787 | my $socket_loop; |
|
|
788 | |
|
|
789 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
|
|
790 | if ( |
|
|
791 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
|
|
792 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
|
|
793 | ) { |
|
|
794 | # use kqueue for sockets |
|
|
795 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
|
|
796 | } |
|
|
797 | |
|
|
798 | # use the default loop otherwise |
|
|
799 | $socket_loop ||= EV::default_loop; |
|
|
800 | |
|
|
801 | $w = EV::embed $otherloop[, $callback] |
|
|
802 | $w = EV::embed_ns $otherloop[, $callback] |
|
|
803 | $w = $loop->embed ($otherloop[, $callback]) |
|
|
804 | $w = $loop->embed_ns ($otherloop[, $callback]) |
|
|
805 | Call the callback when the embedded event loop ($otherloop) has any |
|
|
806 | I/O activity. The $callback is optional: if it is missing, then the |
|
|
807 | embedded event loop will be managed automatically (which is |
|
|
808 | recommended), otherwise you have to invoke "sweep" yourself. |
|
|
809 | |
|
|
810 | The "embed_ns" variant doesn't start (activate) the newly created |
|
|
811 | watcher. |
|
|
812 | |
|
|
813 | ASYNC WATCHERS - how to wake up another event loop |
|
|
814 | Async watchers are provided by EV, but have little use in perl directly, |
|
|
815 | as perl neither supports threads nor direct access to signal handlers or |
|
|
816 | other contexts where they could be of value. |
|
|
817 | |
|
|
818 | It is, however, possible to use them from the XS level. |
|
|
819 | |
|
|
820 | Please see the libev documentation for further details. |
|
|
821 | |
|
|
822 | $w = EV::async $callback |
|
|
823 | $w = EV::async_ns $callback |
|
|
824 | $w->send |
|
|
825 | $bool = $w->async_pending |
|
|
826 | |
713 | PERL SIGNALS |
827 | PERL SIGNALS |
714 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
828 | While Perl signal handling (%SIG) is not affected by EV, the behaviour |
715 | with EV is as the same as any other C library: Perl-signals will only be |
829 | with EV is as the same as any other C library: Perl-signals will only be |
716 | handled when Perl runs, which means your signal handler might be invoked |
830 | handled when Perl runs, which means your signal handler might be invoked |
717 | only the next time an event callback is invoked. |
831 | only the next time an event callback is invoked. |
… | |
… | |
751 | course. |
865 | course. |
752 | |
866 | |
753 | SEE ALSO |
867 | SEE ALSO |
754 | EV::ADNS (asynchronous DNS), Glib::EV (makes Glib/Gtk2 use EV as event |
868 | EV::ADNS (asynchronous DNS), Glib::EV (makes Glib/Gtk2 use EV as event |
755 | loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines |
869 | loop), EV::Glib (embed Glib into EV), Coro::EV (efficient coroutines |
756 | with EV), Net::SNMP::EV (asynchronous SNMP). |
870 | with EV), Net::SNMP::EV (asynchronous SNMP), AnyEvent for event-loop |
|
|
871 | agnostic and portable event driven programming. |
757 | |
872 | |
758 | AUTHOR |
873 | AUTHOR |
759 | Marc Lehmann <schmorp@schmorp.de> |
874 | Marc Lehmann <schmorp@schmorp.de> |
760 | http://home.schmorp.de/ |
875 | http://home.schmorp.de/ |
761 | |
876 | |