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Revision 1.95 by root, Wed May 21 23:35:00 2008 UTC vs.
Revision 1.106 by root, Thu Oct 23 04:56:49 2008 UTC

… …
2 2
3EV - perl interface to libev, a high performance full-featured event loop 3EV - perl interface to libev, a high performance full-featured event loop
4 4
5=head1 SYNOPSIS 5=head1 SYNOPSIS
6 6
7 use EV; 7 use EV;
8
9 # TIMERS
10
11 my $w = EV::timer 2, 0, sub {
12 warn "is called after 2s";
13 };
14
15 my $w = EV::timer 2, 2, sub {
16 warn "is called roughly every 2s (repeat = 2)";
17 };
18
19 undef $w; # destroy event watcher again
20
21 my $w = EV::periodic 0, 60, 0, sub {
22 warn "is called every minute, on the minute, exactly";
23 };
24
25 # IO
26
27 my $w = EV::io *STDIN, EV::READ, sub {
28 my ($w, $revents) = @_; # all callbacks receive the watcher and event mask
29 warn "stdin is readable, you entered: ", <STDIN>;
30 };
31
32 # SIGNALS
33
34 my $w = EV::signal 'QUIT', sub {
35 warn "sigquit received\n";
36 };
37
38 # CHILD/PID STATUS CHANGES
8 39
9 # TIMERS 40 my $w = EV::child 666, 0, sub {
41 my ($w, $revents) = @_;
42 my $status = $w->rstatus;
43 };
10 44
11 my $w = EV::timer 2, 0, sub {
12 warn "is called after 2s";
13 };
14
15 my $w = EV::timer 2, 2, sub {
16 warn "is called roughly every 2s (repeat = 2)";
17 };
18
19 undef $w; # destroy event watcher again
20
21 my $w = EV::periodic 0, 60, 0, sub {
22 warn "is called every minute, on the minute, exactly";
23 };
24
25 # IO
26
27 my $w = EV::io *STDIN, EV::READ, sub {
28 my ($w, $revents) = @_; # all callbacks receive the watcher and event mask
29 warn "stdin is readable, you entered: ", <STDIN>;
30 };
31
32 # SIGNALS
33
34 my $w = EV::signal 'QUIT', sub {
35 warn "sigquit received\n";
36 };
37
38 # CHILD/PID STATUS CHANGES
39
40 my $w = EV::child 666, 0, sub {
41 my ($w, $revents) = @_;
42 my $status = $w->rstatus;
43 };
44
45 # STAT CHANGES 45 # STAT CHANGES
46 my $w = EV::stat "/etc/passwd", 10, sub { 46 my $w = EV::stat "/etc/passwd", 10, sub {
47 my ($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::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
56=head1 DESCRIPTION 56=head1 DESCRIPTION
57 57
58This module provides an interface to libev 58This 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
60below is comprehensive, one might also consult the documentation of libev 60below is comprehensive, one might also consult the documentation of
61itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod>) for more 61libev itself (L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod> or
62subtle details on watcher semantics or some discussion on the available 62F<perldoc EV::libev>) for more subtle details on watcher semantics or some
63backends, or how to force a specific backend with C<LIBEV_FLAGS>, or just 63discussion on the available backends, or how to force a specific backend
64about in any case because it has much more detailed information. 64with C<LIBEV_FLAGS>, or just about in any case because it has much more
65detailed information.
65 66
66This module is very fast and scalable. It is actually so fast that you 67This module is very fast and scalable. It is actually so fast that you
67can use it through the L<AnyEvent> module, stay portable to other event 68can use it through the L<AnyEvent> module, stay portable to other event
68loops (if you don't rely on any watcher types not available through it) 69loops (if you don't rely on any watcher types not available through it)
69and still be faster than with any other event loop currently supported in 70and still be faster than with any other event loop currently supported in
70Perl. 71Perl.
71 72
73=head2 MODULE EXPORTS
74
75This module does not export any symbols.
76
72=cut 77=cut
73 78
74package EV; 79package EV;
75 80
81no warnings;
76use strict; 82use strict;
77 83
78BEGIN { 84BEGIN {
79 our $VERSION = '3.41'; 85 our $VERSION = '3.45';
80 use XSLoader; 86 use XSLoader;
81 XSLoader::load "EV", $VERSION; 87 XSLoader::load "EV", $VERSION;
82} 88}
83 89
84@EV::IO::ISA = 90@EV::IO::ISA =
… …
111default loop as this is fastest (perl-wise), best supported by other 117default loop as this is fastest (perl-wise), best supported by other
112modules (e.g. AnyEvent or Coro) and most portable event loop. 118modules (e.g. AnyEvent or Coro) and most portable event loop.
113 119
114For specific programs you can create additional event loops dynamically. 120For specific programs you can create additional event loops dynamically.
115 121
122If you want to take avdantage of kqueue (which often works properly for
123sockets only) even though the default loop doesn't enable it, you can
124I<embed> a kqueue loop into the default loop: running the default loop
125will then also service the kqueue loop to some extent. See the example in
126the section about embed watchers for an example on how to achieve that.
127
116=over 4 128=over 4
117 129
118=item $loop = new EV::loop [$flags] 130=item $loop = new EV::loop [$flags]
119 131
120Create a new event loop as per the specified flags. Please refer to the 132Create a new event loop as per the specified flags. Please refer to
121C<ev_loop_new ()> function description in the libev documentation 133the C<ev_loop_new ()> function description in the libev documentation
122(L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>) 134(L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#GLOBAL_FUNCTIONS>,
123for more info. 135or locally-installed as F<EV::libev> manpage) for more info.
124 136
125The loop will automatically be destroyed when it is no longer referenced 137The loop will automatically be destroyed when it is no longer referenced
126by any watcher and the loop object goes out of scope. 138by any watcher and the loop object goes out of scope.
127 139
128Using C<EV::FLAG_FORKCHECK> is recommended, as only the default event loop 140If you are not embedding the loop, then Using C<EV::FLAG_FORKCHECK>
129is protected by this module. 141is recommended, as only the default event loop is protected by this
142module. If you I<are> embedding this loop in the default loop, this is not
143necessary, as C<EV::embed> automatically does the right thing on fork.
130 144
131=item $loop->loop_fork 145=item $loop->loop_fork
132 146
133Must be called after a fork in the child, before entering or continuing 147Must be called after a fork in the child, before entering or continuing
134the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls 148the event loop. An alternative is to use C<EV::FLAG_FORKCHECK> which calls
135this fucntion automatically, at some performance loss (refer to the libev 149this function automatically, at some performance loss (refer to the libev
136documentation). 150documentation).
137 151
152=item $loop->loop_verify
153
154Calls C<ev_verify> to make internal consistency checks (for debugging
155libev) and abort the program if any data structures were found to be
156corrupted.
157
138=item $loop = EV::default_loop [$flags] 158=item $loop = EV::default_loop [$flags]
139 159
140Return the default loop (which is a singleton object). 160Return the default loop (which is a singleton object). Since this module
161already creates the default loop with default flags, specifying flags here
162will not have any effect unless you destroy the default loop first, which
163isn't supported. So in short: don't do it, and if you break it, you get to
164keep the pieces.
141 165
142=back 166=back
143 167
144 168
145=head1 BASIC INTERFACE 169=head1 BASIC INTERFACE
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263 287
264=item $loop->set_timeout_collect_interval ($time) 288=item $loop->set_timeout_collect_interval ($time)
265 289
266These advanced functions set the minimum block interval when polling for I/O events and the minimum 290These advanced functions set the minimum block interval when polling for I/O events and the minimum
267wait interval for timer events. See the libev documentation at 291wait interval for timer events. See the libev documentation at
268L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP> for 292L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP>
269a more detailed discussion. 293(locally installed as F<EV::libev>) for a more detailed discussion.
270 294
271=back 295=back
272 296
273 297
274=head1 WATCHER OBJECTS 298=head1 WATCHER OBJECTS
275 299
276A watcher is an object that gets created to record your interest in some 300A watcher is an object that gets created to record your interest in some
277event. For instance, if you want to wait for STDIN to become readable, you 301event. For instance, if you want to wait for STDIN to become readable, you
278would create an EV::io watcher for that: 302would create an EV::io watcher for that:
279 303
280 my $watcher = EV::io *STDIN, EV::READ, sub { 304 my $watcher = EV::io *STDIN, EV::READ, sub {
281 my ($watcher, $revents) = @_; 305 my ($watcher, $revents) = @_;
282 warn "yeah, STDIN should now be readable without blocking!\n" 306 warn "yeah, STDIN should now be readable without blocking!\n"
283 }; 307 };
284 308
285All watchers can be active (waiting for events) or inactive (paused). Only 309All watchers can be active (waiting for events) or inactive (paused). Only
286active watchers will have their callbacks invoked. All callbacks will be 310active watchers will have their callbacks invoked. All callbacks will be
287called with at least two arguments: the watcher and a bitmask of received 311called with at least two arguments: the watcher and a bitmask of received
288events. 312events.
… …
401Example: Register an I/O watcher for some UDP socket but do not keep the 425Example: Register an I/O watcher for some UDP socket but do not keep the
402event loop from running just because of that watcher. 426event loop from running just because of that watcher.
403 427
404 my $udp_socket = ... 428 my $udp_socket = ...
405 my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; 429 my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... };
406 $1000udp_watcher->keepalive (0); 430 $udp_watcher->keepalive (0);
407 431
408=item $loop = $w->loop 432=item $loop = $w->loop
409 433
410Return the loop that this watcher is attached to. 434Return the loop that this watcher is attached to.
411 435
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938loop, other types of watchers might be handled in a delayed or incorrect 962loop, other types of watchers might be handled in a delayed or incorrect
939fashion and must not be used). 963fashion and must not be used).
940 964
941See the libev documentation at 965See the libev documentation at
942L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_> 966L<http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#code_ev_embed_code_when_one_backend_>
943for more details. 967(locally installed as F<EV::libev>) for more details.
944 968
945In short, this watcher is most useful on BSD systems without working 969In short, this watcher is most useful on BSD systems without working
946kqueue to still be able to handle a large number of sockets: 970kqueue to still be able to handle a large number of sockets:
947 971
948 my $socket_loop; 972 my $socket_loop;
949 973
950 # check wether we use SELECT or POLL _and_ KQUEUE is supported 974 # check wether we use SELECT or POLL _and_ KQUEUE is supported
951 if ( 975 if (
952 (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) 976 (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT))
953 && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) 977 && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE)
954 ) { 978 ) {
955 # use kqueue for sockets 979 # use kqueue for sockets
956 $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; 980 $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV;
957 } 981 }
958 982
959 # use the default loop otherwise 983 # use the default loop otherwise
960 $socket_loop ||= EV::default_loop; 984 $socket_loop ||= EV::default_loop;
961 985
962=over 4 986=over 4
963 987
964=item $w = EV::embed $otherloop, $callback 988=item $w = EV::embed $otherloop[, $callback]
965 989
966=item $w = EV::embed_ns $otherloop, $callback 990=item $w = EV::embed_ns $otherloop[, $callback]
967 991
968=item $w = $loop->embed ($otherloop, $callback) 992=item $w = $loop->embed ($otherloop[, $callback])
969 993
970=item $w = $loop->embed_ns ($otherloop, $callback) 994=item $w = $loop->embed_ns ($otherloop[, $callback])
971 995
972Call the callback when the embedded event loop (C<$otherloop>) has any 996Call the callback when the embedded event loop (C<$otherloop>) has any
973I/O activity. The C<$callback> should alwas be specified as C<undef> in 997I/O activity. The C<$callback> is optional: if it is missing, then the
974this version of EV, which means the embedded event loop will be managed 998embedded event loop will be managed automatically (which is recommended),
975automatically. 999otherwise you have to invoke C<sweep> yourself.
976 1000
977The C<embed_ns> variant doesn't start (activate) the newly created watcher. 1001The C<embed_ns> variant doesn't start (activate) the newly created watcher.
978 1002
979=back 1003=back
980 1004
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1061coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for 1085coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for
1062event-loop agnostic and portable event driven programming. 1086event-loop agnostic and portable event driven programming.
1063 1087
1064=head1 AUTHOR 1088=head1 AUTHOR
1065 1089
1066 Marc Lehmann <schmorp@schmorp.de> 1090 Marc Lehmann <schmorp@schmorp.de>
1067 http://home.schmorp.de/ 1091 http://home.schmorp.de/
1068 1092
1069=cut 1093=cut
1070 1094

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