… | |
… | |
35 | warn "sigquit received\n"; |
35 | warn "sigquit received\n"; |
36 | }; |
36 | }; |
37 | |
37 | |
38 | # CHILD/PID STATUS CHANGES |
38 | # CHILD/PID STATUS CHANGES |
39 | |
39 | |
40 | my $w = EV::child 666, sub { |
40 | my $w = EV::child 666, 0, sub { |
41 | my ($w, $revents) = @_; |
41 | my ($w, $revents) = @_; |
42 | my $status = $w->rstatus; |
42 | my $status = $w->rstatus; |
43 | }; |
43 | }; |
44 | |
44 | |
45 | # STAT CHANGES |
45 | # STAT CHANGES |
… | |
… | |
56 | =head1 DESCRIPTION |
56 | =head1 DESCRIPTION |
57 | |
57 | |
58 | This module provides an interface to libev |
58 | This module provides an interface to libev |
59 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
59 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
60 | below is comprehensive, one might also consult the documentation of libev |
60 | below is comprehensive, one might also consult the documentation of libev |
61 | itself (L<http://cvs.schmorp.de/libev/ev.html>) for more subtle details on |
61 | itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>) for more |
62 | watcher semantics or some discussion on the available backends, or how to |
62 | subtle details on watcher semantics or some discussion on the available |
63 | force a specific backend with C<LIBEV_FLAGS>, or just about in any case |
63 | backends, or how to force a specific backend with C<LIBEV_FLAGS>, or just |
64 | because it has much more detailed information. |
64 | about in any case because it has much more detailed information. |
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65 | |
|
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66 | This module is very fast and scalable. It is actually so fast that you |
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67 | can use it through the L<AnyEvent> module, stay portable to other event |
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68 | loops (if you don't rely on any watcher types not available through it) |
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69 | and still be faster than with any other event loop currently supported in |
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70 | Perl. |
65 | |
71 | |
66 | =cut |
72 | =cut |
67 | |
73 | |
68 | package EV; |
74 | package EV; |
69 | |
75 | |
70 | use strict; |
76 | use strict; |
71 | |
77 | |
72 | BEGIN { |
78 | BEGIN { |
73 | our $VERSION = '1.7'; |
79 | our $VERSION = '3.31'; |
74 | use XSLoader; |
80 | use XSLoader; |
75 | XSLoader::load "EV", $VERSION; |
81 | XSLoader::load "EV", $VERSION; |
76 | } |
82 | } |
77 | |
83 | |
78 | @EV::IO::ISA = |
84 | @EV::IO::ISA = |
… | |
… | |
84 | @EV::Idle::ISA = |
90 | @EV::Idle::ISA = |
85 | @EV::Prepare::ISA = |
91 | @EV::Prepare::ISA = |
86 | @EV::Check::ISA = |
92 | @EV::Check::ISA = |
87 | @EV::Embed::ISA = |
93 | @EV::Embed::ISA = |
88 | @EV::Fork::ISA = |
94 | @EV::Fork::ISA = |
|
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95 | @EV::Async::ISA = |
89 | "EV::Watcher"; |
96 | "EV::Watcher"; |
90 | |
97 | |
|
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98 | @EV::Loop::Default::ISA = "EV::Loop"; |
|
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99 | |
|
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100 | =head1 EVENT LOOPS |
|
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101 | |
|
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102 | EV supports multiple event loops: There is a single "default event loop" |
|
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103 | that can handle everything including signals and child watchers, and any |
|
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104 | number of "dynamic event loops" that can use different backends (with |
|
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105 | various limitations), but no child and signal watchers. |
|
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106 | |
|
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107 | You do not have to do anything to create the default event loop: When |
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108 | the module is loaded a suitable backend is selected on the premise of |
|
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109 | selecting a working backend (which for example rules out kqueue on most |
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110 | BSDs). Modules should, unless they have "special needs" always use the |
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111 | default loop as this is fastest (perl-wise), best supported by other |
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112 | modules (e.g. AnyEvent or Coro) and most portable event loop. |
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113 | |
|
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114 | For specific programs you can create additional event loops dynamically. |
|
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115 | |
|
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116 | =over 4 |
|
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117 | |
|
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118 | =item $loop = new EV::loop [$flags] |
|
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119 | |
|
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120 | Create a new event loop as per the specified flags. Please refer to the |
|
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121 | C<ev_loop_new ()> function description in the libev documentation |
|
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122 | (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>) |
|
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123 | for more info. |
|
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124 | |
|
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125 | The loop will automatically be destroyed when it is no longer referenced |
|
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126 | by any watcher and the loop object goes out of scope. |
|
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127 | |
|
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128 | Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop |
|
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129 | is protected by this module. |
|
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130 | |
|
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131 | =item $loop->loop_fork |
|
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132 | |
|
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133 | Must be called after a fork in the child, before entering or continuing |
|
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134 | the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls |
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135 | this fucntion automatically, at some performance loss (refer to the libev |
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136 | documentation). |
|
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137 | |
|
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138 | =item $loop = EV::default_loop [$flags] |
|
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139 | |
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140 | Return the default loop (which is a singleton object). |
|
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141 | |
|
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142 | =back |
|
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143 | |
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144 | |
91 | =head1 BASIC INTERFACE |
145 | =head1 BASIC INTERFACE |
92 | |
146 | |
93 | =over 4 |
147 | =over 4 |
94 | |
148 | |
95 | =item $EV::DIED |
149 | =item $EV::DIED |
96 | |
150 | |
97 | Must contain a reference to a function that is called when a callback |
151 | Must contain a reference to a function that is called when a callback |
98 | throws an exception (with $@ containing thr error). The default prints an |
152 | throws an exception (with $@ containing the error). The default prints an |
99 | informative message and continues. |
153 | informative message and continues. |
100 | |
154 | |
101 | If this callback throws an exception it will be silently ignored. |
155 | If this callback throws an exception it will be silently ignored. |
102 | |
156 | |
|
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157 | =item $flags = EV::supported_backends |
|
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158 | |
|
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159 | =item $flags = EV::recommended_backends |
|
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160 | |
|
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161 | =item $flags = EV::embeddable_backends |
|
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162 | |
|
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163 | Returns the set (see C<EV::BACKEND_*> flags) of backends supported by this |
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164 | instance of EV, the set of recommended backends (supposed to be good) for |
|
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165 | this platform and the set of embeddable backends (see EMBED WATCHERS). |
|
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166 | |
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167 | =item EV::sleep $seconds |
|
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168 | |
|
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169 | Block the process for the given number of (fractional) seconds. |
|
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170 | |
103 | =item $time = EV::time |
171 | =item $time = EV::time |
104 | |
172 | |
105 | Returns the current time in (fractional) seconds since the epoch. |
173 | Returns the current time in (fractional) seconds since the epoch. |
106 | |
174 | |
107 | =item $time = EV::now |
175 | =item $time = EV::now |
|
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176 | |
|
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177 | =item $time = $loop->now |
108 | |
178 | |
109 | Returns the time the last event loop iteration has been started. This |
179 | Returns the time the last event loop iteration has been started. This |
110 | is the time that (relative) timers are based on, and refering to it is |
180 | is the time that (relative) timers are based on, and refering to it is |
111 | usually faster then calling EV::time. |
181 | usually faster then calling EV::time. |
112 | |
182 | |
113 | =item $method = EV::method |
183 | =item $backend = EV::backend |
|
|
184 | |
|
|
185 | =item $backend = $loop->backend |
114 | |
186 | |
115 | Returns an integer describing the backend used by libev (EV::METHOD_SELECT |
187 | Returns an integer describing the backend used by libev (EV::METHOD_SELECT |
116 | or EV::METHOD_EPOLL). |
188 | or EV::METHOD_EPOLL). |
117 | |
189 | |
118 | =item EV::loop [$flags] |
190 | =item EV::loop [$flags] |
|
|
191 | |
|
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192 | =item $loop->loop ([$flags]) |
119 | |
193 | |
120 | Begin checking for events and calling callbacks. It returns when a |
194 | Begin checking for events and calling callbacks. It returns when a |
121 | callback calls EV::unloop. |
195 | callback calls EV::unloop. |
122 | |
196 | |
123 | The $flags argument can be one of the following: |
197 | The $flags argument can be one of the following: |
… | |
… | |
126 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
200 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
127 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
201 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
128 | |
202 | |
129 | =item EV::unloop [$how] |
203 | =item EV::unloop [$how] |
130 | |
204 | |
|
|
205 | =item $loop->unloop ([$how]) |
|
|
206 | |
131 | When called with no arguments or an argument of EV::UNLOOP_ONE, makes the |
207 | When called with no arguments or an argument of EV::UNLOOP_ONE, makes the |
132 | innermost call to EV::loop return. |
208 | innermost call to EV::loop return. |
133 | |
209 | |
134 | When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as |
210 | When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as |
135 | fast as possible. |
211 | fast as possible. |
136 | |
212 | |
137 | =item $count = EV::loop_count |
213 | =item $count = EV::loop_count |
138 | |
214 | |
|
|
215 | =item $count = $loop->loop_count |
|
|
216 | |
139 | Return the number of times the event loop has polled for new |
217 | Return the number of times the event loop has polled for new |
140 | events. Sometiems useful as a generation counter. |
218 | events. Sometiems useful as a generation counter. |
141 | |
219 | |
142 | =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
220 | =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
|
|
221 | |
|
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222 | =item $loop->once ($fh_or_undef, $events, $timeout, $cb->($revents)) |
143 | |
223 | |
144 | This function rolls together an I/O and a timer watcher for a single |
224 | This function rolls together an I/O and a timer watcher for a single |
145 | one-shot event without the need for managing a watcher object. |
225 | one-shot event without the need for managing a watcher object. |
146 | |
226 | |
147 | If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events> |
227 | If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events> |
… | |
… | |
153 | If timeout is C<undef> or negative, then there will be no |
233 | If timeout is C<undef> or negative, then there will be no |
154 | timeout. Otherwise a EV::timer with this value will be started. |
234 | timeout. Otherwise a EV::timer with this value will be started. |
155 | |
235 | |
156 | When an error occurs or either the timeout or I/O watcher triggers, then |
236 | When an error occurs or either the timeout or I/O watcher triggers, then |
157 | the callback will be called with the received event set (in general |
237 | the callback will be called with the received event set (in general |
158 | you can expect it to be a combination of C<EV:ERROR>, C<EV::READ>, |
238 | you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, |
159 | C<EV::WRITE> and C<EV::TIMEOUT>). |
239 | C<EV::WRITE> and C<EV::TIMEOUT>). |
160 | |
240 | |
161 | EV::once doesn't return anything: the watchers stay active till either |
241 | EV::once doesn't return anything: the watchers stay active till either |
162 | of them triggers, then they will be stopped and freed, and the callback |
242 | of them triggers, then they will be stopped and freed, and the callback |
163 | invoked. |
243 | invoked. |
164 | |
244 | |
165 | =back |
245 | =item EV::feed_fd_event ($fd, $revents) |
166 | |
246 | |
|
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247 | =item $loop->feed_fd_event ($fd, $revents) |
|
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248 | |
|
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249 | Feed an event on a file descriptor into EV. EV will react to this call as |
|
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250 | if the readyness notifications specified by C<$revents> (a combination of |
|
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251 | C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>. |
|
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252 | |
|
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253 | =item EV::feed_signal_event ($signal) |
|
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254 | |
|
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255 | Feed a signal event into EV. EV will react to this call as if the signal |
|
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256 | specified by C<$signal> had occured. |
|
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257 | |
|
|
258 | =item EV::set_io_collect_interval $time |
|
|
259 | |
|
|
260 | =item $loop->set_io_collect_interval ($time) |
|
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261 | |
|
|
262 | =item EV::set_timeout_collect_interval $time |
|
|
263 | |
|
|
264 | =item $loop->set_timeout_collect_interval ($time) |
|
|
265 | |
|
|
266 | These advanced functions set the minimum block interval when polling for I/O events and the minimum |
|
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267 | wait interval for timer events. See the libev documentation at |
|
|
268 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for |
|
|
269 | a more detailed discussion. |
|
|
270 | |
|
|
271 | =back |
|
|
272 | |
|
|
273 | |
167 | =head2 WATCHER OBJECTS |
274 | =head1 WATCHER OBJECTS |
168 | |
275 | |
169 | A watcher is an object that gets created to record your interest in some |
276 | A watcher is an object that gets created to record your interest in some |
170 | event. For instance, if you want to wait for STDIN to become readable, you |
277 | event. For instance, if you want to wait for STDIN to become readable, you |
171 | would create an EV::io watcher for that: |
278 | would create an EV::io watcher for that: |
172 | |
279 | |
173 | my $watcher = EV::io *STDIN, EV::READ, sub { |
280 | my $watcher = EV::io *STDIN, EV::READ, sub { |
174 | my ($watcher, $revents) = @_; |
281 | my ($watcher, $revents) = @_; |
175 | warn "yeah, STDIN should not be readable without blocking!\n" |
282 | warn "yeah, STDIN should now be readable without blocking!\n" |
176 | }; |
283 | }; |
177 | |
284 | |
178 | All watchers can be active (waiting for events) or inactive (paused). Only |
285 | All watchers can be active (waiting for events) or inactive (paused). Only |
179 | active watchers will have their callbacks invoked. All callbacks will be |
286 | active watchers will have their callbacks invoked. All callbacks will be |
180 | called with at least two arguments: the watcher and a bitmask of received |
287 | called with at least two arguments: the watcher and a bitmask of received |
… | |
… | |
253 | The default priority of any newly-created watcher is 0. |
360 | The default priority of any newly-created watcher is 0. |
254 | |
361 | |
255 | Note that the priority semantics have not yet been fleshed out and are |
362 | Note that the priority semantics have not yet been fleshed out and are |
256 | subject to almost certain change. |
363 | subject to almost certain change. |
257 | |
364 | |
258 | =item $w->trigger ($revents) |
365 | =item $w->invoke ($revents) |
259 | |
366 | |
260 | Call the callback *now* with the given event mask. |
367 | Call the callback *now* with the given event mask. |
|
|
368 | |
|
|
369 | =item $w->feed_event ($revents) |
|
|
370 | |
|
|
371 | Feed some events on this watcher into EV. EV will react to this call as if |
|
|
372 | the watcher had received the given C<$revents> mask. |
|
|
373 | |
|
|
374 | =item $revents = $w->clear_pending |
|
|
375 | |
|
|
376 | If the watcher is pending, this function clears its pending status and |
|
|
377 | returns its C<$revents> bitset (as if its callback was invoked). If the |
|
|
378 | watcher isn't pending it does nothing and returns C<0>. |
261 | |
379 | |
262 | =item $previous_state = $w->keepalive ($bool) |
380 | =item $previous_state = $w->keepalive ($bool) |
263 | |
381 | |
264 | Normally, C<EV::loop> will return when there are no active watchers |
382 | Normally, C<EV::loop> will return when there are no active watchers |
265 | (which is a "deadlock" because no progress can be made anymore). This is |
383 | (which is a "deadlock" because no progress can be made anymore). This is |
266 | convinient because it allows you to start your watchers (and your jobs), |
384 | convinient because it allows you to start your watchers (and your jobs), |
267 | call C<EV::loop> once and when it returns you know that all your jobs are |
385 | call C<EV::loop> once and when it returns you know that all your jobs are |
268 | finished (or they forgot to register some watchers for their task :). |
386 | finished (or they forgot to register some watchers for their task :). |
269 | |
387 | |
270 | Sometimes, however, this gets in your way, for example when you the module |
388 | Sometimes, however, this gets in your way, for example when the module |
271 | that calls C<EV::loop> (usually the main program) is not the same module |
389 | that calls C<EV::loop> (usually the main program) is not the same module |
272 | as a long-living watcher (for example a DNS client module written by |
390 | as a long-living watcher (for example a DNS client module written by |
273 | somebody else even). Then you might want any outstanding requests to be |
391 | somebody else even). Then you might want any outstanding requests to be |
274 | handled, but you would not want to keep C<EV::loop> from returning just |
392 | handled, but you would not want to keep C<EV::loop> from returning just |
275 | because you happen to have this long-running UDP port watcher. |
393 | because you happen to have this long-running UDP port watcher. |
… | |
… | |
283 | Example: Register an I/O watcher for some UDP socket but do not keep the |
401 | Example: Register an I/O watcher for some UDP socket but do not keep the |
284 | event loop from running just because of that watcher. |
402 | event loop from running just because of that watcher. |
285 | |
403 | |
286 | my $udp_socket = ... |
404 | my $udp_socket = ... |
287 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
405 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
288 | $udp_watcher->keepalive (0); |
406 | $1000udp_watcher->keepalive (0); |
289 | |
407 | |
290 | =back |
408 | =item $loop = $w->loop |
291 | |
409 | |
|
|
410 | Return the loop that this watcher is attached to. |
292 | |
411 | |
|
|
412 | =back |
|
|
413 | |
|
|
414 | |
293 | =head2 WATCHER TYPES |
415 | =head1 WATCHER TYPES |
294 | |
416 | |
295 | Each of the following subsections describes a single watcher type. |
417 | Each of the following subsections describes a single watcher type. |
296 | |
418 | |
297 | =head3 I/O WATCHERS - is this file descriptor readable or writable? |
419 | =head3 I/O WATCHERS - is this file descriptor readable or writable? |
298 | |
420 | |
299 | =over 4 |
421 | =over 4 |
300 | |
422 | |
301 | =item $w = EV::io $fileno_or_fh, $eventmask, $callback |
423 | =item $w = EV::io $fileno_or_fh, $eventmask, $callback |
302 | |
424 | |
303 | =item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback |
425 | =item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback |
|
|
426 | |
|
|
427 | =item $w = $loop->io ($fileno_or_fh, $eventmask, $callback) |
|
|
428 | |
|
|
429 | =item $w = $loop->io_ns ($fileno_or_fh, $eventmask, $callback) |
304 | |
430 | |
305 | As long as the returned watcher object is alive, call the C<$callback> |
431 | As long as the returned watcher object is alive, call the C<$callback> |
306 | when at least one of events specified in C<$eventmask> occurs. |
432 | when at least one of events specified in C<$eventmask> occurs. |
307 | |
433 | |
308 | The $eventmask can be one or more of these constants ORed together: |
434 | The $eventmask can be one or more of these constants ORed together: |
… | |
… | |
337 | =over 4 |
463 | =over 4 |
338 | |
464 | |
339 | =item $w = EV::timer $after, $repeat, $callback |
465 | =item $w = EV::timer $after, $repeat, $callback |
340 | |
466 | |
341 | =item $w = EV::timer_ns $after, $repeat, $callback |
467 | =item $w = EV::timer_ns $after, $repeat, $callback |
|
|
468 | |
|
|
469 | =item $w = $loop->timer ($after, $repeat, $callback) |
|
|
470 | |
|
|
471 | =item $w = $loop->timer_ns ($after, $repeat, $callback) |
342 | |
472 | |
343 | Calls the callback after C<$after> seconds (which may be fractional). If |
473 | Calls the callback after C<$after> seconds (which may be fractional). If |
344 | C<$repeat> is non-zero, the timer will be restarted (with the $repeat |
474 | C<$repeat> is non-zero, the timer will be restarted (with the $repeat |
345 | value as $after) after the callback returns. |
475 | value as $after) after the callback returns. |
346 | |
476 | |
… | |
… | |
387 | =over 4 |
517 | =over 4 |
388 | |
518 | |
389 | =item $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
519 | =item $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
390 | |
520 | |
391 | =item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
521 | =item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
|
|
522 | |
|
|
523 | =item $w = $loop->periodic ($at, $interval, $reschedule_cb, $callback) |
|
|
524 | |
|
|
525 | =item $w = $loop->periodic_ns ($at, $interval, $reschedule_cb, $callback) |
392 | |
526 | |
393 | Similar to EV::timer, but is not based on relative timeouts but on |
527 | Similar to EV::timer, but is not based on relative timeouts but on |
394 | absolute times. Apart from creating "simple" timers that trigger "at" the |
528 | absolute times. Apart from creating "simple" timers that trigger "at" the |
395 | specified time, it can also be used for non-drifting absolute timers and |
529 | specified time, it can also be used for non-drifting absolute timers and |
396 | more complex, cron-like, setups that are not adversely affected by time |
530 | more complex, cron-like, setups that are not adversely affected by time |
… | |
… | |
406 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
540 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
407 | will not adjust when a time jump occurs, that is, if it is to be run |
541 | will not adjust when a time jump occurs, that is, if it is to be run |
408 | at January 1st 2011 then it will run when the system time reaches or |
542 | at January 1st 2011 then it will run when the system time reaches or |
409 | surpasses this time. |
543 | surpasses this time. |
410 | |
544 | |
411 | =item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0) |
545 | =item * repeating interval timer ($interval > 0, $reschedule_cb = 0) |
412 | |
546 | |
413 | In this mode the watcher will always be scheduled to time out at the |
547 | In this mode the watcher will always be scheduled to time out at the |
414 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
548 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
415 | regardless of any time jumps. |
549 | regardless of any time jumps. |
416 | |
550 | |
… | |
… | |
471 | |
605 | |
472 | =item $w->again |
606 | =item $w->again |
473 | |
607 | |
474 | Simply stops and starts the watcher again. |
608 | Simply stops and starts the watcher again. |
475 | |
609 | |
|
|
610 | =item $time = $w->at |
|
|
611 | |
|
|
612 | Return the time that the watcher is expected to trigger next. |
|
|
613 | |
476 | =back |
614 | =back |
477 | |
615 | |
478 | |
616 | |
479 | =head3 SIGNAL WATCHERS - signal me when a signal gets signalled! |
617 | =head3 SIGNAL WATCHERS - signal me when a signal gets signalled! |
480 | |
618 | |
… | |
… | |
513 | |
651 | |
514 | =head3 CHILD WATCHERS - watch out for process status changes |
652 | =head3 CHILD WATCHERS - watch out for process status changes |
515 | |
653 | |
516 | =over 4 |
654 | =over 4 |
517 | |
655 | |
518 | =item $w = EV::child $pid, $callback |
656 | =item $w = EV::child $pid, $trace, $callback |
519 | |
657 | |
520 | =item $w = EV::child_ns $pid, $callback |
658 | =item $w = EV::child_ns $pid, $trace, $callback |
521 | |
659 | |
|
|
660 | =item $w = $loop->child ($pid, $trace, $callback) |
|
|
661 | |
|
|
662 | =item $w = $loop->child_ns ($pid, $trace, $callback) |
|
|
663 | |
522 | Call the callback when a status change for pid C<$pid> (or any pid if |
664 | Call the callback when a status change for pid C<$pid> (or any pid |
523 | C<$pid> is 0) has been received. More precisely: when the process receives |
665 | if C<$pid> is 0) has been received (a status change happens when the |
|
|
666 | process terminates or is killed, or, when trace is true, additionally when |
|
|
667 | it is stopped or continued). More precisely: when the process receives |
524 | a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all |
668 | a C<SIGCHLD>, EV will fetch the outstanding exit/wait status for all |
525 | changed/zombie children and call the callback. |
669 | changed/zombie children and call the callback. |
526 | |
670 | |
527 | It is valid (and fully supported) to install a child watcher after a child |
671 | It is valid (and fully supported) to install a child watcher after a child |
528 | has exited but before the event loop has started its next iteration (for |
672 | has exited but before the event loop has started its next iteration (for |
… | |
… | |
535 | You can have as many pid watchers per pid as you want, they will all be |
679 | You can have as many pid watchers per pid as you want, they will all be |
536 | called. |
680 | called. |
537 | |
681 | |
538 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
682 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
539 | |
683 | |
540 | =item $w->set ($pid) |
684 | =item $w->set ($pid, $trace) |
541 | |
685 | |
542 | Reconfigures the watcher, see the constructor above for details. Can be called at |
686 | Reconfigures the watcher, see the constructor above for details. Can be called at |
543 | any time. |
687 | any time. |
544 | |
688 | |
545 | =item $current_pid = $w->pid |
689 | =item $current_pid = $w->pid |
546 | |
690 | |
547 | =item $old_pid = $w->pid ($new_pid) |
|
|
548 | |
|
|
549 | Returns the previously set process id and optionally set a new one. |
691 | Returns the previously set process id and optionally set a new one. |
550 | |
692 | |
551 | =item $exit_status = $w->rstatus |
693 | =item $exit_status = $w->rstatus |
552 | |
694 | |
553 | Return the exit/wait status (as returned by waitpid, see the waitpid entry |
695 | Return the exit/wait status (as returned by waitpid, see the waitpid entry |
… | |
… | |
566 | =over 4 |
708 | =over 4 |
567 | |
709 | |
568 | =item $w = EV::stat $path, $interval, $callback |
710 | =item $w = EV::stat $path, $interval, $callback |
569 | |
711 | |
570 | =item $w = EV::stat_ns $path, $interval, $callback |
712 | =item $w = EV::stat_ns $path, $interval, $callback |
|
|
713 | |
|
|
714 | =item $w = $loop->stat ($path, $interval, $callback) |
|
|
715 | |
|
|
716 | =item $w = $loop->stat_ns ($path, $interval, $callback) |
571 | |
717 | |
572 | Call the callback when a file status change has been detected on |
718 | Call the callback when a file status change has been detected on |
573 | C<$path>. The C<$path> does not need to exist, changing from "path exists" |
719 | C<$path>. The C<$path> does not need to exist, changing from "path exists" |
574 | to "path does not exist" is a status change like any other. |
720 | to "path does not exist" is a status change like any other. |
575 | |
721 | |
… | |
… | |
645 | =over 4 |
791 | =over 4 |
646 | |
792 | |
647 | =item $w = EV::idle $callback |
793 | =item $w = EV::idle $callback |
648 | |
794 | |
649 | =item $w = EV::idle_ns $callback |
795 | =item $w = EV::idle_ns $callback |
|
|
796 | |
|
|
797 | =item $w = $loop->idle ($callback) |
|
|
798 | |
|
|
799 | =item $w = $loop->idle_ns ($callback) |
650 | |
800 | |
651 | Call the callback when there are no other pending watchers of the same or |
801 | Call the callback when there are no other pending watchers of the same or |
652 | higher priority (excluding check, prepare and other idle watchers of the |
802 | higher priority (excluding check, prepare and other idle watchers of the |
653 | same or lower priority, of course). They are called idle watchers because |
803 | same or lower priority, of course). They are called idle watchers because |
654 | when the watcher is the highest priority pending event in the process, the |
804 | when the watcher is the highest priority pending event in the process, the |
… | |
… | |
677 | |
827 | |
678 | =item $w = EV::prepare $callback |
828 | =item $w = EV::prepare $callback |
679 | |
829 | |
680 | =item $w = EV::prepare_ns $callback |
830 | =item $w = EV::prepare_ns $callback |
681 | |
831 | |
|
|
832 | =item $w = $loop->prepare ($callback) |
|
|
833 | |
|
|
834 | =item $w = $loop->prepare_ns ($callback) |
|
|
835 | |
682 | Call the callback just before the process would block. You can still |
836 | Call the callback just before the process would block. You can still |
683 | create/modify any watchers at this point. |
837 | create/modify any watchers at this point. |
684 | |
838 | |
685 | See the EV::check watcher, below, for explanations and an example. |
839 | See the EV::check watcher, below, for explanations and an example. |
686 | |
840 | |
… | |
… | |
694 | =over 4 |
848 | =over 4 |
695 | |
849 | |
696 | =item $w = EV::check $callback |
850 | =item $w = EV::check $callback |
697 | |
851 | |
698 | =item $w = EV::check_ns $callback |
852 | =item $w = EV::check_ns $callback |
|
|
853 | |
|
|
854 | =item $w = $loop->check ($callback) |
|
|
855 | |
|
|
856 | =item $w = $loop->check_ns ($callback) |
699 | |
857 | |
700 | Call the callback just after the process wakes up again (after it has |
858 | Call the callback just after the process wakes up again (after it has |
701 | gathered events), but before any other callbacks have been invoked. |
859 | gathered events), but before any other callbacks have been invoked. |
702 | |
860 | |
703 | This is used to integrate other event-based software into the EV |
861 | This is used to integrate other event-based software into the EV |
… | |
… | |
758 | |
916 | |
759 | =item $w = EV::fork $callback |
917 | =item $w = EV::fork $callback |
760 | |
918 | |
761 | =item $w = EV::fork_ns $callback |
919 | =item $w = EV::fork_ns $callback |
762 | |
920 | |
|
|
921 | =item $w = $loop->fork ($callback) |
|
|
922 | |
|
|
923 | =item $w = $loop->fork_ns ($callback) |
|
|
924 | |
763 | Call the callback before the event loop is resumed in the child process |
925 | Call the callback before the event loop is resumed in the child process |
764 | after a fork. |
926 | after a fork. |
765 | |
927 | |
766 | The C<fork_ns> variant doesn't start (activate) the newly created watcher. |
928 | The C<fork_ns> variant doesn't start (activate) the newly created watcher. |
|
|
929 | |
|
|
930 | =back |
|
|
931 | |
|
|
932 | |
|
|
933 | =head3 EMBED WATCHERS - when one backend isn't enough... |
|
|
934 | |
|
|
935 | This is a rather advanced watcher type that lets you embed one event loop |
|
|
936 | into another (currently only IO events are supported in the embedded |
|
|
937 | loop, other types of watchers might be handled in a delayed or incorrect |
|
|
938 | fashion and must not be used). |
|
|
939 | |
|
|
940 | See the libev documentation at |
|
|
941 | L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_> |
|
|
942 | for more details. |
|
|
943 | |
|
|
944 | In short, this watcher is most useful on BSD systems without working |
|
|
945 | kqueue to still be able to handle a large number of sockets: |
|
|
946 | |
|
|
947 | my $socket_loop; |
|
|
948 | |
|
|
949 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
|
|
950 | if ( |
|
|
951 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
|
|
952 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
|
|
953 | ) { |
|
|
954 | # use kqueue for sockets |
|
|
955 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
|
|
956 | } |
|
|
957 | |
|
|
958 | # use the default loop otherwise |
|
|
959 | $socket_loop ||= EV::default_loop; |
|
|
960 | |
|
|
961 | =over 4 |
|
|
962 | |
|
|
963 | =item $w = EV::embed $otherloop, $callback |
|
|
964 | |
|
|
965 | =item $w = EV::embed_ns $otherloop, $callback |
|
|
966 | |
|
|
967 | =item $w = $loop->embed ($otherloop, $callback) |
|
|
968 | |
|
|
969 | =item $w = $loop->embed_ns ($otherloop, $callback) |
|
|
970 | |
|
|
971 | Call the callback when the embedded event loop (C<$otherloop>) has any |
|
|
972 | I/O activity. The C<$callback> should alwas be specified as C<undef> in |
|
|
973 | this version of EV, which means the embedded event loop will be managed |
|
|
974 | automatically. |
|
|
975 | |
|
|
976 | The C<embed_ns> variant doesn't start (activate) the newly created watcher. |
|
|
977 | |
|
|
978 | =back |
|
|
979 | |
|
|
980 | =head3 ASYNC WATCHERS - how to wake up another event loop |
|
|
981 | |
|
|
982 | Async watchers are provided by EV, but have little use in perl directly, as perl |
|
|
983 | neither supports threads nor direct access to signal handlers or other |
|
|
984 | contexts where they could be of value. |
|
|
985 | |
|
|
986 | It is, however, possible to use them from the XS level. |
|
|
987 | |
|
|
988 | Please see the libev documentation for further details. |
|
|
989 | |
|
|
990 | =over 4 |
|
|
991 | |
|
|
992 | =item $w = EV::async $callback |
|
|
993 | |
|
|
994 | =item $w = EV::async_ns $callback |
|
|
995 | |
|
|
996 | =item $w->send |
|
|
997 | |
|
|
998 | =item $bool = $w->async_pending |
767 | |
999 | |
768 | =back |
1000 | =back |
769 | |
1001 | |
770 | |
1002 | |
771 | =head1 PERL SIGNALS |
1003 | =head1 PERL SIGNALS |
… | |
… | |
782 | to be called on every event loop iteration by installing a C<EV::check> |
1014 | to be called on every event loop iteration by installing a C<EV::check> |
783 | watcher: |
1015 | watcher: |
784 | |
1016 | |
785 | my $async_check = EV::check sub { }; |
1017 | my $async_check = EV::check sub { }; |
786 | |
1018 | |
787 | This ensures that perl shortly gets into control for a short time, and |
1019 | This ensures that perl gets into control for a short time to handle any |
788 | also ensures slower overall operation. |
1020 | pending signals, and also ensures (slightly) slower overall operation. |
789 | |
1021 | |
790 | =head1 THREADS |
1022 | =head1 THREADS |
791 | |
1023 | |
792 | Threads are not supported by this module in any way. Perl pseudo-threads |
1024 | Threads are not supported by this module in any way. Perl pseudo-threads |
793 | is evil stuff and must die. As soon as Perl gains real threads I will work |
1025 | is evil stuff and must die. As soon as Perl gains real threads I will work |
… | |
… | |
815 | our $DIED = sub { |
1047 | our $DIED = sub { |
816 | warn "EV: error in callback (ignoring): $@"; |
1048 | warn "EV: error in callback (ignoring): $@"; |
817 | }; |
1049 | }; |
818 | |
1050 | |
819 | default_loop |
1051 | default_loop |
820 | or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?'; |
1052 | or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_FLAGS}?'; |
821 | |
1053 | |
822 | 1; |
1054 | 1; |
823 | |
1055 | |
824 | =head1 SEE ALSO |
1056 | =head1 SEE ALSO |
825 | |
1057 | |
826 | L<EV::ADNS> (asynchronous dns), L<Glib::EV> (makes Glib/Gtk2 use EV as |
1058 | L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as |
827 | event loop), L<Coro::EV> (efficient coroutines with EV). |
1059 | event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient |
|
|
1060 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
|
|
1061 | event-loop agnostic and portable event driven programming. |
828 | |
1062 | |
829 | =head1 AUTHOR |
1063 | =head1 AUTHOR |
830 | |
1064 | |
831 | Marc Lehmann <schmorp@schmorp.de> |
1065 | Marc Lehmann <schmorp@schmorp.de> |
832 | http://home.schmorp.de/ |
1066 | http://home.schmorp.de/ |