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Revision 1.126 by root, Tue Mar 16 17:11:48 2010 UTC vs.
Revision 1.135 by root, Mon Dec 12 16:32:24 2011 UTC

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47 my ($w, $revents) = @_; 47 my ($w, $revents) = @_;
48 warn $w->path, " has changed somehow.\n"; 48 warn $w->path, " has changed somehow.\n";
49 }; 49 };
50 50
51 # MAINLOOP 51 # MAINLOOP
52 EV::loop; # loop until EV::unloop is called or all watchers stop 52 EV::run; # 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::run EV::RUN_ONCE; # 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::run EV::RUN_NOWAIT; # try to handle same events, but do not block
55
56=head1 BEFORE YOU START USING THIS MODULE
57
58If you only need timer, I/O, signal, child and idle watchers and not the
59advanced functionality of this module, consider using L<AnyEvent> instead,
60specifically the simplified API described in L<AE>.
61
62When used with EV as backend, the L<AE> API is as fast as the native L<EV>
63API, but your programs/modules will still run with many other event loops.
55 64
56=head1 DESCRIPTION 65=head1 DESCRIPTION
57 66
58This module provides an interface to libev 67This 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
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68can use it through the L<AnyEvent> module, stay portable to other event 77can use it through the L<AnyEvent> module, stay portable to other event
69loops (if you don't rely on any watcher types not available through it) 78loops (if you don't rely on any watcher types not available through it)
70and still be faster than with any other event loop currently supported in 79and still be faster than with any other event loop currently supported in
71Perl. 80Perl.
72 81
82=head2 PORTING FROM EV 3.X to 4.X
83
84EV version 4 introduces a number of incompatible changes summarised
85here. According to the depreciation strategy used by libev, there is a
86compatibility layer in place so programs should continue to run unchanged
87(the XS interface lacks this layer, so programs using that one need to be
88updated).
89
90This compatibility layer will be switched off in some future release.
91
92All changes relevant to Perl are renames of symbols, functions and
93methods:
94
95 EV::loop => EV::run
96 EV::LOOP_NONBLOCK => EV::RUN_NOWAIT
97 EV::LOOP_ONESHOT => EV::RUN_ONCE
98
99 EV::unloop => EV::break
100 EV::UNLOOP_CANCEL => EV::BREAK_CANCEL
101 EV::UNLOOP_ONE => EV::BREAK_ONE
102 EV::UNLOOP_ALL => EV::BREAK_ALL
103
104 EV::TIMEOUT => EV::TIMER
105
106 EV::loop_count => EV::iteration
107 EV::loop_depth => EV::depth
108 EV::loop_verify => EV::verify
109
110The loop object methods corresponding to the functions above have been
111similarly renamed.
112
73=head2 MODULE EXPORTS 113=head2 MODULE EXPORTS
74 114
75This module does not export any symbols. 115This module does not export any symbols.
76 116
77=cut 117=cut
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79package EV; 119package EV;
80 120
81use common::sense; 121use common::sense;
82 122
83BEGIN { 123BEGIN {
84 our $VERSION = '4.00'; 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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146Must be called after a fork in the child, before entering or continuing 186Must be called after a fork in the child, before entering or continuing
147the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls 187the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls
148this function automatically, at some performance loss (refer to the libev 188this function automatically, at some performance loss (refer to the libev
149documentation). 189documentation).
150 190
151=item $loop->loop_verify 191=item $loop->verify
152 192
153Calls C<ev_verify> to make internal consistency checks (for debugging 193Calls C<ev_verify> to make internal consistency checks (for debugging
154libev) and abort the program if any data structures were found to be 194libev) and abort the program if any data structures were found to be
155corrupted. 195corrupted.
156 196
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250=item $backend = $loop->backend 290=item $backend = $loop->backend
251 291
252Returns an integer describing the backend used by libev (EV::BACKEND_SELECT 292Returns an integer describing the backend used by libev (EV::BACKEND_SELECT
253or EV::BACKEND_EPOLL). 293or EV::BACKEND_EPOLL).
254 294
255=item EV::loop [$flags] 295=item EV::run [$flags]
256 296
257=item $loop->loop ([$flags]) 297=item $loop->run ([$flags])
258 298
259Begin checking for events and calling callbacks. It returns when a 299Begin checking for events and calling callbacks. It returns when a
260callback calls EV::unloop. 300callback calls EV::unloop.
261 301
262The $flags argument can be one of the following: 302The $flags argument can be one of the following:
263 303
264 0 as above 304 0 as above
265 EV::LOOP_ONESHOT block at most once (wait, but do not loop) 305 EV::RUN_ONCE block at most once (wait, but do not loop)
266 EV::LOOP_NONBLOCK do not block at all (fetch/handle events but do not wait) 306 EV::RUN_NOWAIT do not block at all (fetch/handle events but do not wait)
267 307
268=item EV::unloop [$how] 308=item EV::break [$how]
269 309
270=item $loop->unloop ([$how]) 310=item $loop->break ([$how])
271 311
272When called with no arguments or an argument of EV::UNLOOP_ONE, makes the 312When called with no arguments or an argument of EV::BREAK_ONE, makes the
273innermost call to EV::loop return. 313innermost call to EV::loop return.
274 314
275When called with an argument of EV::UNLOOP_ALL, all calls to EV::loop will return as 315When called with an argument of EV::BREAK_ALL, all calls to EV::loop will
276fast as possible. 316return as fast as possible.
277 317
278=item $count = EV::loop_count 318When called with an argument of EV::BREAK_CANCEL, any pending break will
319be cancelled.
279 320
321=item $count = EV::iteration
322
280=item $count = $loop->loop_count 323=item $count = $loop->iteration
281 324
282Return the number of times the event loop has polled for new 325Return the number of times the event loop has polled for new
283events. Sometimes useful as a generation counter. 326events. Sometimes useful as a generation counter.
284 327
285=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents) 328=item EV::once $fh_or_undef, $events, $timeout, $cb->($revents)
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305 348
306EV::once doesn't return anything: the watchers stay active till either 349EV::once doesn't return anything: the watchers stay active till either
307of them triggers, then they will be stopped and freed, and the callback 350of them triggers, then they will be stopped and freed, and the callback
308invoked. 351invoked.
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, $revents)
313 356
314Feed an event on a file descriptor into EV. EV will react to this call as 357Feed an event on a file descriptor into EV. EV will react to this call as
315if the readyness notifications specified by C<$revents> (a combination of 358if the readyness notifications specified by C<$revents> (a combination of
316C<EV::READ> and C<EV::WRITE>) happened on the file descriptor C<$fd>. 359C<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 $signal
319 362
320Feed a signal event into EV. EV will react to this call as if the signal 363Feed a signal event into the default loop. EV will react to this call as
321specified by C<$signal> had occured. 364if the signal specified by C<$signal> had occured.
365
366=item EV::feed_signal $signal
367
368Feed a signal event into EV - unlike C<EV::feed_signal_event>, this works
369regardless of which loop has registered the signal, and is mainly useful
370fro 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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941=item $w = $loop->check_ns ($callback) 990=item $w = $loop->check_ns ($callback)
942 991
943Call the callback just after the process wakes up again (after it has 992Call the callback just after the process wakes up again (after it has
944gathered events), but before any other callbacks have been invoked. 993gathered events), but before any other callbacks have been invoked.
945 994
946This is used to integrate other event-based software into the EV 995This can be used to integrate other event-based software into the EV
947mainloop: You register a prepare callback and in there, you create io and 996mainloop: You register a prepare callback and in there, you create io and
948timer watchers as required by the other software. Here is a real-world 997timer watchers as required by the other software. Here is a real-world
949example of integrating Net::SNMP (with some details left out): 998example of integrating Net::SNMP (with some details left out):
950 999
951 our @snmp_watcher; 1000 our @snmp_watcher;
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985The callbacks of the created watchers will not be called as the watchers 1034The callbacks of the created watchers will not be called as the watchers
986are destroyed before this can happen (remember EV::check gets called 1035are destroyed before this can happen (remember EV::check gets called
987first). 1036first).
988 1037
989The C<check_ns> variant doesn't start (activate) the newly created watcher. 1038The C<check_ns> variant doesn't start (activate) the newly created watcher.
1039
1040=item EV::CHECK constant issues
1041
1042Like all other watcher types, there is a bitmask constant for use in
1043C<$revents> and other places. The C<EV::CHECK> is special as it has
1044the same name as the C<CHECK> sub called by Perl. This doesn't cause
1045big issues on newer perls (beginning with 5.8.9), but it means thatthe
1046constant must be I<inlined>, i.e. runtime calls will not work. That means
1047that as long as you always C<use EV> and then C<EV::CHECK> you are on the
1048safe side.
990 1049
991=back 1050=back
992 1051
993 1052
994=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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1138 1197
11391; 11981;
1140 1199
1141=head1 SEE ALSO 1200=head1 SEE ALSO
1142 1201
1202L<EV::MakeMaker> - MakeMaker interface to XS API, L<EV::ADNS>
1143L<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
1144event loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient 1204loop), L<EV::Glib> (embed Glib into EV), L<Coro::EV> (efficient thread
1145coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for 1205integration), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
1146event-loop agnostic and portable event driven programming. 1206event-loop agnostic and portable event driven programming.
1147 1207
1148=head1 AUTHOR 1208=head1 AUTHOR
1149 1209
1150 Marc Lehmann <schmorp@schmorp.de> 1210 Marc Lehmann <schmorp@schmorp.de>

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