… | |
… | |
10 | |
10 | |
11 | my $w = EV::timer 2, 0, sub { |
11 | my $w = EV::timer 2, 0, sub { |
12 | warn "is called after 2s"; |
12 | warn "is called after 2s"; |
13 | }; |
13 | }; |
14 | |
14 | |
15 | my $w = EV::timer 2, 1, sub { |
15 | my $w = EV::timer 2, 2, sub { |
16 | warn "is called roughly every 2s (repeat = 1)"; |
16 | warn "is called roughly every 2s (repeat = 2)"; |
17 | }; |
17 | }; |
18 | |
18 | |
19 | undef $w; # destroy event watcher again |
19 | undef $w; # destroy event watcher again |
20 | |
20 | |
21 | my $w = EV::periodic 0, 60, sub { |
21 | my $w = EV::periodic 0, 60, 0, sub { |
22 | warn "is called every minute, on the minute, exactly"; |
22 | warn "is called every minute, on the minute, exactly"; |
23 | }; |
23 | }; |
24 | |
24 | |
25 | # IO |
25 | # IO |
26 | |
26 | |
27 | my $w = EV::io *STDIN, EV::READ, sub { |
27 | my $w = EV::io *STDIN, EV::READ, sub { |
28 | my ($w, $revents) = @_; # all callbacks get the watcher object and event mask |
28 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
29 | warn "stdin is readable, you entered: ", <STDIN>; |
29 | warn "stdin is readable, you entered: ", <STDIN>; |
30 | }; |
30 | }; |
31 | |
31 | |
32 | # SIGNALS |
32 | # SIGNALS |
33 | |
33 | |
34 | my $w = EV::signal 'QUIT', sub { |
34 | my $w = EV::signal 'QUIT', sub { |
35 | warn "sigquit received\n"; |
35 | warn "sigquit received\n"; |
36 | }; |
36 | }; |
37 | |
37 | |
|
|
38 | # CHILD/PID STATUS CHANGES |
|
|
39 | |
38 | my $w = EV::signal 3, sub { |
40 | my $w = EV::child 666, sub { |
39 | warn "sigquit received (this is GNU/Linux, right?)\n"; |
41 | my ($w, $revents) = @_; |
|
|
42 | my $status = $w->rstatus; |
40 | }; |
43 | }; |
41 | |
|
|
42 | # CHILD/PID STATUS CHANGES |
|
|
43 | |
|
|
44 | my $w = EV::child 666, sub { |
|
|
45 | my ($w, $revents, $status) = @_; |
|
|
46 | }; |
|
|
47 | |
44 | |
48 | # MAINLOOP |
45 | # MAINLOOP |
49 | EV::loop; # loop until EV::loop_done is called |
46 | EV::loop; # loop until EV::unloop is called or all watchers stop |
50 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
47 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
51 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
48 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
52 | |
49 | |
53 | =head1 DESCRIPTION |
50 | =head1 DESCRIPTION |
54 | |
51 | |
… | |
… | |
60 | package EV; |
57 | package EV; |
61 | |
58 | |
62 | use strict; |
59 | use strict; |
63 | |
60 | |
64 | BEGIN { |
61 | BEGIN { |
65 | our $VERSION = '0.1'; |
62 | our $VERSION = '1.2'; |
66 | use XSLoader; |
63 | use XSLoader; |
67 | XSLoader::load "EV", $VERSION; |
64 | XSLoader::load "EV", $VERSION; |
68 | } |
65 | } |
69 | |
66 | |
70 | @EV::Io::ISA = |
67 | @EV::IO::ISA = |
71 | @EV::Timer::ISA = |
68 | @EV::Timer::ISA = |
72 | @EV::Periodic::ISA = |
69 | @EV::Periodic::ISA = |
73 | @EV::Signal::ISA = |
70 | @EV::Signal::ISA = |
74 | @EV::Idle::ISA = |
71 | @EV::Idle::ISA = |
75 | @EV::Prepare::ISA = |
72 | @EV::Prepare::ISA = |
… | |
… | |
96 | |
93 | |
97 | Returns the time the last event loop iteration has been started. This |
94 | Returns the time the last event loop iteration has been started. This |
98 | is the time that (relative) timers are based on, and refering to it is |
95 | is the time that (relative) timers are based on, and refering to it is |
99 | usually faster then calling EV::time. |
96 | usually faster then calling EV::time. |
100 | |
97 | |
101 | =item $method = EV::ev_method |
98 | =item $method = EV::method |
102 | |
99 | |
103 | Returns an integer describing the backend used by libev (EV::METHOD_SELECT |
100 | Returns an integer describing the backend used by libev (EV::METHOD_SELECT |
104 | or EV::METHOD_EPOLL). |
101 | or EV::METHOD_EPOLL). |
105 | |
102 | |
106 | =item EV::loop [$flags] |
103 | =item EV::loop [$flags] |
107 | |
104 | |
108 | Begin checking for events and calling callbacks. It returns when a |
105 | Begin checking for events and calling callbacks. It returns when a |
109 | callback calls EV::loop_done. |
106 | callback calls EV::unloop. |
110 | |
107 | |
111 | The $flags argument can be one of the following: |
108 | The $flags argument can be one of the following: |
112 | |
109 | |
113 | 0 as above |
110 | 0 as above |
114 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
111 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
115 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
112 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
116 | |
113 | |
117 | =item EV::loop_done [$how] |
114 | =item EV::unloop [$how] |
118 | |
115 | |
119 | When called with no arguments or an argument of 1, makes the innermost |
116 | When called with no arguments or an argument of EV::UNLOOP_ONE, makes the |
120 | call to EV::loop return. |
117 | innermost call to EV::loop return. |
121 | |
118 | |
122 | When called with an agrument of 2, all calls to EV::loop will return as |
119 | When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as |
123 | fast as possible. |
120 | fast as possible. |
|
|
121 | |
|
|
122 | =item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) |
|
|
123 | |
|
|
124 | This function rolls together an I/O and a timer watcher for a single |
|
|
125 | one-shot event without the need for managing a watcher object. |
|
|
126 | |
|
|
127 | If C<$fh_or_undef> is a filehandle or file descriptor, then C<$events> |
|
|
128 | must be a bitset containing either C<EV::READ>, C<EV::WRITE> or C<EV::READ |
|
|
129 | | EV::WRITE>, indicating the type of I/O event you want to wait for. If |
|
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130 | you do not want to wait for some I/O event, specify C<undef> for |
|
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131 | C<$fh_or_undef> and C<0> for C<$events>). |
|
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132 | |
|
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133 | If timeout is C<undef> or negative, then there will be no |
|
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134 | timeout. Otherwise a EV::timer with this value will be started. |
|
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135 | |
|
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136 | When an error occurs or either the timeout or I/O watcher triggers, then |
|
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137 | the callback will be called with the received event set (in general |
|
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138 | you can expect it to be a combination of C<EV:ERROR>, C<EV::READ>, |
|
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139 | C<EV::WRITE> and C<EV::TIMEOUT>). |
|
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140 | |
|
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141 | EV::once doesn't return anything: the watchers stay active till either |
|
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142 | of them triggers, then they will be stopped and freed, and the callback |
|
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143 | invoked. |
124 | |
144 | |
125 | =back |
145 | =back |
126 | |
146 | |
127 | =head2 WATCHER |
147 | =head2 WATCHER |
128 | |
148 | |
… | |
… | |
150 | In the rare case where one wants to create a watcher but not start it at |
170 | In the rare case where one wants to create a watcher but not start it at |
151 | the same time, each constructor has a variant with a trailing C<_ns> in |
171 | the same time, each constructor has a variant with a trailing C<_ns> in |
152 | its name, e.g. EV::io has a non-starting variant EV::io_ns and so on. |
172 | its name, e.g. EV::io has a non-starting variant EV::io_ns and so on. |
153 | |
173 | |
154 | Please note that a watcher will automatically be stopped when the watcher |
174 | Please note that a watcher will automatically be stopped when the watcher |
155 | object is returned, so you I<need> to keep the watcher objects returned by |
175 | object is destroyed, so you I<need> to keep the watcher objects returned by |
156 | the constructors. |
176 | the constructors. |
|
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177 | |
|
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178 | Also, all methods changing some aspect of a watcher (->set, ->priority, |
|
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179 | ->fh and so on) automatically stop and start it again if it is active, |
|
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180 | which means pending events get lost. |
157 | |
181 | |
158 | =head2 WATCHER TYPES |
182 | =head2 WATCHER TYPES |
159 | |
183 | |
160 | Now lets move to the existing watcher types and asociated methods. |
184 | Now lets move to the existing watcher types and asociated methods. |
161 | |
185 | |
… | |
… | |
180 | |
204 | |
181 | =item $bool = $w->is_active |
205 | =item $bool = $w->is_active |
182 | |
206 | |
183 | Returns true if the watcher is active, false otherwise. |
207 | Returns true if the watcher is active, false otherwise. |
184 | |
208 | |
|
|
209 | =item $current_data = $w->data |
|
|
210 | |
|
|
211 | =item $old_data = $w->data ($new_data) |
|
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212 | |
|
|
213 | Queries a freely usable data scalar on the watcher and optionally changes |
|
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214 | it. This is a way to associate custom data with a watcher: |
|
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215 | |
|
|
216 | my $w = EV::timer 60, 0, sub { |
|
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217 | warn $_[0]->data; |
|
|
218 | }; |
|
|
219 | $w->data ("print me!"); |
|
|
220 | |
185 | =item $current_cb = $w->cb |
221 | =item $current_cb = $w->cb |
186 | |
222 | |
187 | =item $old_cb = $w->cb ($new_cb) |
223 | =item $old_cb = $w->cb ($new_cb) |
188 | |
224 | |
189 | Queries the callback on the watcher and optionally changes it. You cna do |
225 | Queries the callback on the watcher and optionally changes it. You can do |
190 | this at any time. |
226 | this at any time without the watcher restarting. |
|
|
227 | |
|
|
228 | =item $current_priority = $w->priority |
|
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229 | |
|
|
230 | =item $old_priority = $w->priority ($new_priority) |
|
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231 | |
|
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232 | Queries the priority on the watcher and optionally changes it. Pending |
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233 | watchers with higher priority will be invoked first. The valid range of |
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234 | priorities lies between EV::MAXPRI (default 2) and EV::MINPRI (default |
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235 | -2). If the priority is outside this range it will automatically be |
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236 | normalised to the nearest valid priority. |
|
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237 | |
|
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238 | The default priority of any newly-created watcher is 0. |
|
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239 | |
|
|
240 | Note that the priority semantics have not yet been fleshed out and are |
|
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241 | subject to almost certain change. |
191 | |
242 | |
192 | =item $w->trigger ($revents) |
243 | =item $w->trigger ($revents) |
193 | |
244 | |
194 | Call the callback *now* with the given event mask. |
245 | Call the callback *now* with the given event mask. |
195 | |
246 | |
|
|
247 | =item $previous_state = $w->keepalive ($bool) |
|
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248 | |
|
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249 | Normally, C<EV::loop> will return when there are no active watchers |
|
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250 | (which is a "deadlock" because no progress can be made anymore). This is |
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251 | convinient because it allows you to start your watchers (and your jobs), |
|
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252 | call C<EV::loop> once and when it returns you know that all your jobs are |
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253 | finished (or they forgot to register some watchers for their task :). |
|
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254 | |
|
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255 | Sometimes, however, this gets in your way, for example when you the module |
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256 | that calls C<EV::loop> (usually the main program) is not the same module |
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257 | as a long-living watcher (for example a DNS client module written by |
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258 | somebody else even). Then you might want any outstanding requests to be |
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259 | handled, but you would not want to keep C<EV::loop> from returning just |
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260 | because you happen to have this long-running UDP port watcher. |
|
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261 | |
|
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262 | In this case you can clear the keepalive status, which means that even |
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263 | though your watcher is active, it won't keep C<EV::loop> from returning. |
|
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264 | |
|
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265 | The initial value for keepalive is true (enabled), and you cna change it |
|
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266 | any time. |
|
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267 | |
|
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268 | Example: Register an IO watcher for some UDP socket but do not keep the |
|
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269 | event loop from running just because of that watcher. |
|
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270 | |
|
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271 | my $udp_socket = ... |
|
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272 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
|
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273 | $udp_watcher->keepalive (0); |
196 | |
274 | |
197 | =item $w = EV::io $fileno_or_fh, $eventmask, $callback |
275 | =item $w = EV::io $fileno_or_fh, $eventmask, $callback |
198 | |
276 | |
199 | =item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback |
277 | =item $w = EV::io_ns $fileno_or_fh, $eventmask, $callback |
200 | |
278 | |
… | |
… | |
233 | Calls the callback after C<$after> seconds. If C<$repeat> is non-zero, |
311 | Calls the callback after C<$after> seconds. If C<$repeat> is non-zero, |
234 | the timer will be restarted (with the $repeat value as $after) after the |
312 | the timer will be restarted (with the $repeat value as $after) after the |
235 | callback returns. |
313 | callback returns. |
236 | |
314 | |
237 | This means that the callback would be called roughly after C<$after> |
315 | This means that the callback would be called roughly after C<$after> |
238 | seconds, and then every C<$repeat> seconds. "Roughly" because the time of |
316 | seconds, and then every C<$repeat> seconds. The timer does his best not |
239 | callback processing is not taken into account, so the timer will slowly |
317 | to drift, but it will not invoke the timer more often then once per event |
240 | drift. If that isn't acceptable, look at EV::periodic. |
318 | loop iteration, and might drift in other cases. If that isn't acceptable, |
|
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319 | look at EV::periodic, which can provide long-term stable timers. |
241 | |
320 | |
242 | The timer is based on a monotonic clock, that is if somebody is sitting |
321 | The timer is based on a monotonic clock, that is, if somebody is sitting |
243 | in front of the machine while the timer is running and changes the system |
322 | in front of the machine while the timer is running and changes the system |
244 | clock, the timer will nevertheless run (roughly) the same time. |
323 | clock, the timer will nevertheless run (roughly) the same time. |
245 | |
324 | |
246 | The C<timer_ns> variant doesn't start (activate) the newly created watcher. |
325 | The C<timer_ns> variant doesn't start (activate) the newly created watcher. |
247 | |
326 | |
… | |
… | |
252 | |
331 | |
253 | =item $w->again |
332 | =item $w->again |
254 | |
333 | |
255 | Similar to the C<start> method, but has special semantics for repeating timers: |
334 | Similar to the C<start> method, but has special semantics for repeating timers: |
256 | |
335 | |
|
|
336 | If the timer is active and non-repeating, it will be stopped. |
|
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337 | |
257 | If the timer is active and repeating, reset the timeout to occur |
338 | If the timer is active and repeating, reset the timeout to occur |
258 | C<$repeat> seconds after now. |
339 | C<$repeat> seconds after now. |
259 | |
340 | |
260 | If the timer is active and non-repeating, it will be stopped. |
|
|
261 | |
|
|
262 | If the timer is in active and repeating, start it. |
341 | If the timer is inactive and repeating, start it using the repeat value. |
263 | |
342 | |
264 | Otherwise do nothing. |
343 | Otherwise do nothing. |
265 | |
344 | |
266 | This behaviour is useful when you have a timeout for some IO |
345 | This behaviour is useful when you have a timeout for some IO |
267 | operation. You create a timer object with the same value for C<$after> and |
346 | operation. You create a timer object with the same value for C<$after> and |
268 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
347 | C<$repeat>, and then, in the read/write watcher, run the C<again> method |
269 | on the timeout. |
348 | on the timeout. |
270 | |
349 | |
271 | |
350 | |
272 | =item $w = EV::periodic $at, $interval, $callback |
351 | =item $w = EV::periodic $at, $interval, $reschedule_cb, $callback |
273 | |
352 | |
274 | =item $w = EV::periodic_ns $at, $interval, $callback |
353 | =item $w = EV::periodic_ns $at, $interval, $reschedule_cb, $callback |
275 | |
354 | |
276 | Similar to EV::timer, but the time is given as an absolute point in time |
355 | Similar to EV::timer, but is not based on relative timeouts but on |
277 | (C<$at>), plus an optional C<$interval>. |
356 | absolute times. Apart from creating "simple" timers that trigger "at" the |
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357 | specified time, it can also be used for non-drifting absolute timers and |
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358 | more complex, cron-like, setups that are not adversely affected by time |
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359 | jumps (i.e. when the system clock is changed by explicit date -s or other |
|
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360 | means such as ntpd). It is also the most complex watcher type in EV. |
278 | |
361 | |
279 | If the C<$interval> is zero, then the callback will be called at the time |
362 | It has three distinct "modes": |
280 | C<$at> if that is in the future, or as soon as possible if it is in the |
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281 | past. It will not automatically repeat. |
|
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282 | |
363 | |
283 | If the C<$interval> is nonzero, then the watcher will always be scheduled |
364 | =over 4 |
284 | to time out at the next C<$at + N * $interval> time. |
|
|
285 | |
365 | |
286 | This can be used to schedule a callback to run at very regular intervals, |
366 | =item * absolute timer ($interval = $reschedule_cb = 0) |
287 | as long as the processing time is less then the interval (otherwise |
367 | |
288 | obviously events will be skipped). |
368 | This time simply fires at the wallclock time C<$at> and doesn't repeat. It |
|
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369 | will not adjust when a time jump occurs, that is, if it is to be run |
|
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370 | at January 1st 2011 then it will run when the system time reaches or |
|
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371 | surpasses this time. |
|
|
372 | |
|
|
373 | =item * non-repeating interval timer ($interval > 0, $reschedule_cb = 0) |
|
|
374 | |
|
|
375 | In this mode the watcher will always be scheduled to time out at the |
|
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376 | next C<$at + N * $interval> time (for some integer N) and then repeat, |
|
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377 | regardless of any time jumps. |
|
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378 | |
|
|
379 | This can be used to create timers that do not drift with respect to system |
|
|
380 | time: |
|
|
381 | |
|
|
382 | my $hourly = EV::periodic 0, 3600, 0, sub { print "once/hour\n" }; |
|
|
383 | |
|
|
384 | That doesn't mean there will always be 3600 seconds in between triggers, |
|
|
385 | but only that the the clalback will be called when the system time shows a |
|
|
386 | full hour (UTC). |
289 | |
387 | |
290 | Another way to think about it (for the mathematically inclined) is that |
388 | Another way to think about it (for the mathematically inclined) is that |
291 | EV::periodic will try to run the callback at the next possible time where |
389 | EV::periodic will try to run the callback in this mode at the next |
292 | C<$time = $at (mod $interval)>, regardless of any time jumps. |
390 | possible time where C<$time = $at (mod $interval)>, regardless of any time |
|
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391 | jumps. |
293 | |
392 | |
294 | This periodic timer is based on "wallclock time", that is, if the clock |
393 | =item * manual reschedule mode ($reschedule_cb = coderef) |
295 | changes (C<ntp>, C<date -s> etc.), then the timer will nevertheless run at |
394 | |
296 | the specified time. This means it will never drift (it might jitter, but |
395 | In this mode $interval and $at are both being ignored. Instead, each |
297 | it will not drift). |
396 | time the periodic watcher gets scheduled, the reschedule callback |
|
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397 | ($reschedule_cb) will be called with the watcher as first, and the current |
|
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398 | time as second argument. |
|
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399 | |
|
|
400 | I<This callback MUST NOT stop or destroy this or any other periodic |
|
|
401 | watcher, ever>. If you need to stop it, return 1e30 and stop it |
|
|
402 | afterwards. |
|
|
403 | |
|
|
404 | It must return the next time to trigger, based on the passed time value |
|
|
405 | (that is, the lowest time value larger than to the second argument). It |
|
|
406 | will usually be called just before the callback will be triggered, but |
|
|
407 | might be called at other times, too. |
|
|
408 | |
|
|
409 | This can be used to create very complex timers, such as a timer that |
|
|
410 | triggers on each midnight, local time (actually 24 hours after the last |
|
|
411 | midnight, to keep the example simple. If you know a way to do it correctly |
|
|
412 | in about the same space (without requiring elaborate modules), drop me a |
|
|
413 | note :): |
|
|
414 | |
|
|
415 | my $daily = EV::periodic 0, 0, sub { |
|
|
416 | my ($w, $now) = @_; |
|
|
417 | |
|
|
418 | use Time::Local (); |
|
|
419 | my (undef, undef, undef, $d, $m, $y) = localtime $now; |
|
|
420 | 86400 + Time::Local::timelocal 0, 0, 0, $d, $m, $y |
|
|
421 | }, sub { |
|
|
422 | print "it's midnight or likely shortly after, now\n"; |
|
|
423 | }; |
|
|
424 | |
|
|
425 | =back |
298 | |
426 | |
299 | The C<periodic_ns> variant doesn't start (activate) the newly created watcher. |
427 | The C<periodic_ns> variant doesn't start (activate) the newly created watcher. |
300 | |
428 | |
301 | =item $w->set ($at, $interval) |
429 | =item $w->set ($at, $interval, $reschedule_cb) |
302 | |
430 | |
303 | Reconfigures the watcher, see the constructor above for details. Can be at |
431 | Reconfigures the watcher, see the constructor above for details. Can be at |
304 | any time. |
432 | any time. |
|
|
433 | |
|
|
434 | =item $w->again |
|
|
435 | |
|
|
436 | Simply stops and starts the watcher again. |
305 | |
437 | |
306 | |
438 | |
307 | =item $w = EV::signal $signal, $callback |
439 | =item $w = EV::signal $signal, $callback |
308 | |
440 | |
309 | =item $w = EV::signal_ns $signal, $callback |
441 | =item $w = EV::signal_ns $signal, $callback |
… | |
… | |
323 | =item $w->set ($signal) |
455 | =item $w->set ($signal) |
324 | |
456 | |
325 | Reconfigures the watcher, see the constructor above for details. Can be at |
457 | Reconfigures the watcher, see the constructor above for details. Can be at |
326 | any time. |
458 | any time. |
327 | |
459 | |
|
|
460 | =item $current_signum = $w->signal |
|
|
461 | |
|
|
462 | =item $old_signum = $w->signal ($new_signal) |
|
|
463 | |
|
|
464 | Returns the previously set signal (always as a number not name) and |
|
|
465 | optionally set a new one. |
|
|
466 | |
328 | |
467 | |
329 | =item $w = EV::child $pid, $callback |
468 | =item $w = EV::child $pid, $callback |
330 | |
469 | |
331 | =item $w = EV::child_ns $pid, $callback |
470 | =item $w = EV::child_ns $pid, $callback |
332 | |
471 | |
333 | Call the callback when a status change for pid C<$pid> (or any pid |
472 | Call the callback when a status change for pid C<$pid> (or any pid |
334 | if C<$pid> is 0) has been received. More precisely: when the process |
473 | if C<$pid> is 0) has been received. More precisely: when the process |
335 | receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all |
474 | receives a SIGCHLD, EV will fetch the outstanding exit/wait status for all |
336 | changed/zombie children and call the callback. |
475 | changed/zombie children and call the callback. |
337 | |
476 | |
338 | Unlike all other callbacks, this callback will be called with an |
477 | You can access both status and pid by using the C<rstatus> and C<rpid> |
339 | additional third argument which is the exit status. See the C<waitpid> |
478 | methods on the watcher object. |
340 | function for details. |
|
|
341 | |
479 | |
342 | You can have as many pid watchers per pid as you want. |
480 | You can have as many pid watchers per pid as you want. |
343 | |
481 | |
344 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
482 | The C<child_ns> variant doesn't start (activate) the newly created watcher. |
345 | |
483 | |
346 | =item $w->set ($pid) |
484 | =item $w->set ($pid) |
347 | |
485 | |
348 | Reconfigures the watcher, see the constructor above for details. Can be at |
486 | Reconfigures the watcher, see the constructor above for details. Can be at |
349 | any time. |
487 | any time. |
|
|
488 | |
|
|
489 | =item $current_pid = $w->pid |
|
|
490 | |
|
|
491 | =item $old_pid = $w->pid ($new_pid) |
|
|
492 | |
|
|
493 | Returns the previously set process id and optionally set a new one. |
|
|
494 | |
|
|
495 | =item $exit_status = $w->rstatus |
|
|
496 | |
|
|
497 | Return the exit/wait status (as returned by waitpid, see the waitpid entry |
|
|
498 | in perlfunc). |
|
|
499 | |
|
|
500 | =item $pid = $w->rpid |
|
|
501 | |
|
|
502 | Return the pid of the awaited child (useful when you have installed a |
|
|
503 | watcher for all pids). |
350 | |
504 | |
351 | |
505 | |
352 | =item $w = EV::idle $callback |
506 | =item $w = EV::idle $callback |
353 | |
507 | |
354 | =item $w = EV::idle_ns $callback |
508 | =item $w = EV::idle_ns $callback |
… | |
… | |
392 | # do nothing unless active |
546 | # do nothing unless active |
393 | $dispatcher->{_event_queue_h} |
547 | $dispatcher->{_event_queue_h} |
394 | or return; |
548 | or return; |
395 | |
549 | |
396 | # make the dispatcher handle any outstanding stuff |
550 | # make the dispatcher handle any outstanding stuff |
|
|
551 | ... not shown |
397 | |
552 | |
398 | # create an IO watcher for each and every socket |
553 | # create an IO watcher for each and every socket |
399 | @snmp_watcher = ( |
554 | @snmp_watcher = ( |
400 | (map { EV::io $_, EV::READ, sub { } } |
555 | (map { EV::io $_, EV::READ, sub { } } |
401 | keys %{ $dispatcher->{_descriptors} }), |
556 | keys %{ $dispatcher->{_descriptors} }), |
|
|
557 | |
|
|
558 | EV::timer +($event->[Net::SNMP::Dispatcher::_ACTIVE] |
|
|
559 | ? $event->[Net::SNMP::Dispatcher::_TIME] - EV::now : 0), |
|
|
560 | 0, sub { }, |
402 | ); |
561 | ); |
403 | |
|
|
404 | # if there are any timeouts, also create a timer |
|
|
405 | push @snmp_watcher, EV::timer $event->[Net::SNMP::Dispatcher::_TIME] - EV::now, 0, sub { } |
|
|
406 | if $event->[Net::SNMP::Dispatcher::_ACTIVE]; |
|
|
407 | }; |
562 | }; |
408 | |
563 | |
409 | The callbacks are irrelevant, the only purpose of those watchers is |
564 | The callbacks are irrelevant (and are not even being called), the |
410 | to wake up the process as soon as one of those events occurs (socket |
565 | only purpose of those watchers is to wake up the process as soon as |
411 | readable, or timer timed out). The corresponding EV::check watcher will then |
566 | one of those events occurs (socket readable, or timer timed out). The |
412 | clean up: |
567 | corresponding EV::check watcher will then clean up: |
413 | |
568 | |
414 | our $snmp_check = EV::check sub { |
569 | our $snmp_check = EV::check sub { |
415 | # destroy all watchers |
570 | # destroy all watchers |
416 | @snmp_watcher = (); |
571 | @snmp_watcher = (); |
417 | |
572 | |
418 | # make the dispatcher handle any new stuff |
573 | # make the dispatcher handle any new stuff |
|
|
574 | ... not shown |
419 | }; |
575 | }; |
420 | |
576 | |
421 | The callbacks of the created watchers will not be called as the watchers |
577 | The callbacks of the created watchers will not be called as the watchers |
422 | are destroyed before this cna happen (remember EV::check gets called |
578 | are destroyed before this cna happen (remember EV::check gets called |
423 | first). |
579 | first). |
… | |
… | |
426 | |
582 | |
427 | =back |
583 | =back |
428 | |
584 | |
429 | =head1 THREADS |
585 | =head1 THREADS |
430 | |
586 | |
431 | Threads are not supported by this in any way. Perl pseudo-threads is evil |
587 | Threads are not supported by this module in any way. Perl pseudo-threads |
432 | stuff and must die. |
588 | is evil stuff and must die. As soon as Perl gains real threads I will work |
|
|
589 | on thread support for it. |
|
|
590 | |
|
|
591 | =head1 FORK |
|
|
592 | |
|
|
593 | Most of the "improved" event delivering mechanisms of modern operating |
|
|
594 | systems have quite a few problems with fork(2) (to put it bluntly: it is |
|
|
595 | not supported and usually destructive). Libev makes it possible to work |
|
|
596 | around this by having a function that recreates the kernel state after |
|
|
597 | fork in the child. |
|
|
598 | |
|
|
599 | On non-win32 platforms, this module requires the pthread_atfork |
|
|
600 | functionality to do this automatically for you. This function is quite |
|
|
601 | buggy on most BSDs, though, so YMMV. The overhead for this is quite |
|
|
602 | negligible, because everything the function currently does is set a flag |
|
|
603 | that is checked only when the event loop gets used the next time, so when |
|
|
604 | you do fork but not use EV, the overhead is minimal. |
|
|
605 | |
|
|
606 | On win32, there is no notion of fork so all this doesn't apply, of course. |
433 | |
607 | |
434 | =cut |
608 | =cut |
435 | |
609 | |
436 | our $DIED = sub { |
610 | our $DIED = sub { |
437 | warn "EV: error in callback (ignoring): $@"; |
611 | warn "EV: error in callback (ignoring): $@"; |
438 | }; |
612 | }; |
439 | |
613 | |
440 | init; |
614 | default_loop |
441 | |
615 | or die 'EV: cannot initialise libev backend. bad $ENV{LIBEV_METHODS}?'; |
442 | push @AnyEvent::REGISTRY, [EV => "EV::AnyEvent"]; |
|
|
443 | |
616 | |
444 | 1; |
617 | 1; |
445 | |
618 | |
446 | =head1 SEE ALSO |
619 | =head1 SEE ALSO |
447 | |
620 | |
448 | L<EV::DNS>, L<EV::AnyEvent>. |
621 | L<EV::DNS>. |
449 | |
622 | |
450 | =head1 AUTHOR |
623 | =head1 AUTHOR |
451 | |
624 | |
452 | Marc Lehmann <schmorp@schmorp.de> |
625 | Marc Lehmann <schmorp@schmorp.de> |
453 | http://home.schmorp.de/ |
626 | http://home.schmorp.de/ |