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51 | # MAINLOOP |
51 | # MAINLOOP |
52 | EV::loop; # loop until EV::unloop is called or all watchers stop |
52 | EV::loop; # loop until EV::unloop is called or all watchers stop |
53 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
53 | EV::loop EV::LOOP_ONESHOT; # block until at least one event could be handled |
54 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
54 | EV::loop EV::LOOP_NONBLOCK; # try to handle same events, but do not block |
55 | |
55 | |
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56 | =head1 BEFORE YOU START USING THIS MODULE |
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57 | |
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58 | If you only need timer, I/O, signal, child and idle watchers and not the |
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59 | advanced functionality of this module, consider using L<AnyEvent> instead, |
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60 | specifically the simplified API described in L<AE>. |
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61 | |
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62 | When used with EV as backend, the L<AE> API is as fast as the native L<EV> |
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63 | API, but your programs/modules will still run with many other event loops. |
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64 | |
56 | =head1 DESCRIPTION |
65 | =head1 DESCRIPTION |
57 | |
66 | |
58 | This module provides an interface to libev |
67 | This module provides an interface to libev |
59 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
68 | (L<http://software.schmorp.de/pkg/libev.html>). While the documentation |
60 | below is comprehensive, one might also consult the documentation of |
69 | below is comprehensive, one might also consult the documentation of |
… | |
… | |
68 | can use it through the L<AnyEvent> module, stay portable to other event |
77 | can use it through the L<AnyEvent> module, stay portable to other event |
69 | loops (if you don't rely on any watcher types not available through it) |
78 | loops (if you don't rely on any watcher types not available through it) |
70 | and still be faster than with any other event loop currently supported in |
79 | and still be faster than with any other event loop currently supported in |
71 | Perl. |
80 | Perl. |
72 | |
81 | |
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82 | =head2 PORTING FROM EV 3.X to 4.X |
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83 | |
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84 | EV version 4 introduces a number of incompatible changes summarised |
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85 | here. According to the depreciation strategy used by libev, there is a |
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86 | compatibility layer in place so programs should continue to run unchanged |
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87 | (the XS interface lacks this layer, so programs using that one need to be |
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88 | updated). |
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89 | |
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90 | This compatibility layer will be switched off in some future release. |
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91 | |
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92 | All changes relevant to Perl are renames of symbols, functions and |
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93 | methods: |
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94 | |
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95 | EV::loop => EV::run |
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96 | EV::LOOP_NONBLOCK => EV::RUN_NOWAIT |
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97 | EV::LOOP_ONESHOT => EV::RUN_ONCE |
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98 | |
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99 | EV::unloop => EV::break |
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100 | EV::UNLOOP_CANCEL => EV::BREAK_CANCEL |
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101 | EV::UNLOOP_ONE => EV::BREAK_ONE |
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102 | EV::UNLOOP_ALL => EV::BREAK_ALL |
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103 | |
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104 | EV::TIMEOUT => EV::TIMER |
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105 | |
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106 | EV::loop_count => EV::iteration |
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107 | EV::loop_depth => EV::depth |
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108 | EV::loop_verify => EV::verify |
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109 | |
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110 | The loop object methods corresponding to the functions above have been |
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111 | similarly renamed. |
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112 | |
73 | =head2 MODULE EXPORTS |
113 | =head2 MODULE EXPORTS |
74 | |
114 | |
75 | This module does not export any symbols. |
115 | This module does not export any symbols. |
76 | |
116 | |
77 | =cut |
117 | =cut |
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79 | package EV; |
119 | package EV; |
80 | |
120 | |
81 | use common::sense; |
121 | use common::sense; |
82 | |
122 | |
83 | BEGIN { |
123 | BEGIN { |
84 | our $VERSION = '3.9'; |
124 | our $VERSION = '4.03'; |
85 | use XSLoader; |
125 | use XSLoader; |
86 | XSLoader::load "EV", $VERSION; |
126 | XSLoader::load "EV", $VERSION; |
87 | } |
127 | } |
88 | |
128 | |
89 | @EV::IO::ISA = |
129 | @EV::IO::ISA = |
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259 | Begin checking for events and calling callbacks. It returns when a |
299 | Begin checking for events and calling callbacks. It returns when a |
260 | callback calls EV::unloop. |
300 | callback calls EV::unloop. |
261 | |
301 | |
262 | The $flags argument can be one of the following: |
302 | The $flags argument can be one of the following: |
263 | |
303 | |
264 | 0 as above |
304 | 0 as above |
265 | EV::LOOP_ONESHOT block at most once (wait, but do not loop) |
305 | EV::LOOP_ONCE block at most once (wait, but do not loop) |
266 | EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) |
306 | EV::LOOP_NOWAIT do not block at all (fetch/handle events but do not wait) |
267 | |
307 | |
268 | =item EV::unloop [$how] |
308 | =item EV::break [$how] |
269 | |
309 | |
270 | =item $loop->unloop ([$how]) |
310 | =item $loop->break ([$how]) |
271 | |
311 | |
272 | When called with no arguments or an argument of EV::UNLOOP_ONE, makes the |
312 | When called with no arguments or an argument of EV::BREAK_ONE, makes the |
273 | innermost call to EV::loop return. |
313 | innermost call to EV::loop return. |
274 | |
314 | |
275 | When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as |
315 | When called with an argument of EV::BREAK_ALL, all calls to EV::loop will |
276 | fast as possible. |
316 | return as fast as possible. |
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317 | |
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318 | When called with an argument of EV::BREAK_CANCEL, any pending break will |
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319 | be cancelled. |
277 | |
320 | |
278 | =item $count = EV::loop_count |
321 | =item $count = EV::loop_count |
279 | |
322 | |
280 | =item $count = $loop->loop_count |
323 | =item $count = $loop->loop_count |
281 | |
324 | |
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299 | timeout. Otherwise a EV::timer with this value will be started. |
342 | timeout. Otherwise a EV::timer with this value will be started. |
300 | |
343 | |
301 | When an error occurs or either the timeout or I/O watcher triggers, then |
344 | When an error occurs or either the timeout or I/O watcher triggers, then |
302 | the callback will be called with the received event set (in general |
345 | the callback will be called with the received event set (in general |
303 | you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, |
346 | you can expect it to be a combination of C<EV::ERROR>, C<EV::READ>, |
304 | C<EV::WRITE> and C<EV::TIMEOUT>). |
347 | C<EV::WRITE> and C<EV::TIMER>). |
305 | |
348 | |
306 | EV::once doesn't return anything: the watchers stay active till either |
349 | EV::once doesn't return anything: the watchers stay active till either |
307 | of them triggers, then they will be stopped and freed, and the callback |
350 | of them triggers, then they will be stopped and freed, and the callback |
308 | invoked. |
351 | invoked. |
309 | |
352 | |
310 | =item EV::feed_fd_event ($fd, $revents) |
353 | =item EV::feed_fd_event $fd, $revents |
311 | |
354 | |
312 | =item $loop->feed_fd_event ($fd, $revents) |
355 | =item $loop->feed_fd_event ($fd, $revents) |
313 | |
356 | |
314 | Feed an event on a file descriptor into EV. EV will react to this call as |
357 | Feed an event on a file descriptor into EV. EV will react to this call as |
315 | if the readyness notifications specified by C<$revents> (a combination of |
358 | if the readyness notifications specified by C<$revents> (a combination of |
316 | C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>. |
359 | C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>. |
317 | |
360 | |
318 | =item EV::feed_signal_event ($signal) |
361 | =item EV::feed_signal_event $signal |
319 | |
362 | |
320 | Feed a signal event into EV. EV will react to this call as if the signal |
363 | Feed a signal event into the default loop. EV will react to this call as |
321 | specified by C<$signal> had occured. |
364 | if the signal specified by C<$signal> had occured. |
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365 | |
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366 | =item EV::feed_signal $signal |
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367 | |
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368 | Feed a signal event into EV - unlike C<EV::feed_signal_event>, this works |
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369 | regardless of which loop has registered the signal, and is mainly useful |
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370 | fro custom signal implementations. |
322 | |
371 | |
323 | =item EV::set_io_collect_interval $time |
372 | =item EV::set_io_collect_interval $time |
324 | |
373 | |
325 | =item $loop->set_io_collect_interval ($time) |
374 | =item $loop->set_io_collect_interval ($time) |
326 | |
375 | |
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366 | |
415 | |
367 | Each watcher type has its associated bit in revents, so you can use the |
416 | Each watcher type has its associated bit in revents, so you can use the |
368 | same callback for multiple watchers. The event mask is named after the |
417 | same callback for multiple watchers. The event mask is named after the |
369 | type, i.e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
418 | type, i.e. EV::child sets EV::CHILD, EV::prepare sets EV::PREPARE, |
370 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events |
419 | EV::periodic sets EV::PERIODIC and so on, with the exception of I/O events |
371 | (which can set both EV::READ and EV::WRITE bits), and EV::timer (which |
420 | (which can set both EV::READ and EV::WRITE bits). |
372 | uses EV::TIMEOUT). |
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373 | |
421 | |
374 | In the rare case where one wants to create a watcher but not start it at |
422 | In the rare case where one wants to create a watcher but not start it at |
375 | the same time, each constructor has a variant with a trailing C<_ns> in |
423 | the same time, each constructor has a variant with a trailing C<_ns> in |
376 | its name, e.g. EV::io has a non-starting variant EV::io_ns and so on. |
424 | its name, e.g. EV::io has a non-starting variant EV::io_ns and so on. |
377 | |
425 | |
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942 | =item $w = $loop->check_ns ($callback) |
990 | =item $w = $loop->check_ns ($callback) |
943 | |
991 | |
944 | Call the callback just after the process wakes up again (after it has |
992 | Call the callback just after the process wakes up again (after it has |
945 | gathered events), but before any other callbacks have been invoked. |
993 | gathered events), but before any other callbacks have been invoked. |
946 | |
994 | |
947 | This is used to integrate other event-based software into the EV |
995 | This can be used to integrate other event-based software into the EV |
948 | mainloop: You register a prepare callback and in there, you create io and |
996 | mainloop: You register a prepare callback and in there, you create io and |
949 | timer watchers as required by the other software. Here is a real-world |
997 | timer watchers as required by the other software. Here is a real-world |
950 | example of integrating Net::SNMP (with some details left out): |
998 | example of integrating Net::SNMP (with some details left out): |
951 | |
999 | |
952 | our @snmp_watcher; |
1000 | our @snmp_watcher; |
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986 | The callbacks of the created watchers will not be called as the watchers |
1034 | The callbacks of the created watchers will not be called as the watchers |
987 | are destroyed before this can happen (remember EV::check gets called |
1035 | are destroyed before this can happen (remember EV::check gets called |
988 | first). |
1036 | first). |
989 | |
1037 | |
990 | The C<check_ns> variant doesn't start (activate) the newly created watcher. |
1038 | The C<check_ns> variant doesn't start (activate) the newly created watcher. |
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1039 | |
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1040 | =item EV::CHECK constant issues |
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1041 | |
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1042 | Like all other watcher types, there is a bitmask constant for use in |
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1043 | C<$revents> and other places. The C<EV::CHECK> is special as it has |
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1044 | the same name as the C<CHECK> sub called by Perl. This doesn't cause |
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1045 | big issues on newer perls (beginning with 5.8.9), but it means thatthe |
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1046 | constant must be I<inlined>, i.e. runtime calls will not work. That means |
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1047 | that as long as you always C<use EV> and then C<EV::CHECK> you are on the |
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1048 | safe side. |
991 | |
1049 | |
992 | =back |
1050 | =back |
993 | |
1051 | |
994 | |
1052 | |
995 | =head3 FORK WATCHERS - the audacity to resume the event loop after a fork |
1053 | =head3 FORK WATCHERS - the audacity to resume the event loop after a fork |
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1139 | |
1197 | |
1140 | 1; |
1198 | 1; |
1141 | |
1199 | |
1142 | =head1 SEE ALSO |
1200 | =head1 SEE ALSO |
1143 | |
1201 | |
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1202 | L<EV::MakeMaker> - MakeMaker interface to XS API, L<EV::ADNS> |
1144 | L<EV::ADNS> (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as |
1203 | (asynchronous DNS), L<Glib::EV> (makes Glib/Gtk2 use EV as event |
1145 | event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient |
1204 | loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient thread |
1146 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
1205 | integration), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
1147 | event-loop agnostic and portable event driven programming. |
1206 | event-loop agnostic and portable event driven programming. |
1148 | |
1207 | |
1149 | =head1 AUTHOR |
1208 | =head1 AUTHOR |
1150 | |
1209 | |
1151 | Marc Lehmann <schmorp@schmorp.de> |
1210 | Marc Lehmann <schmorp@schmorp.de> |