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3 | EV - perl interface to libev, a high performance full-featured event loop |
3 | EV - 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; |
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8 | |
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9 | # TIMERS |
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10 | |
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11 | my $w = EV::timer 2, 0, sub { |
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12 | warn "is called after 2s"; |
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13 | }; |
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14 | |
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15 | my $w = EV::timer 2, 2, sub { |
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16 | warn "is called roughly every 2s (repeat = 2)"; |
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17 | }; |
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18 | |
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19 | undef $w; # destroy event watcher again |
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20 | |
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21 | my $w = EV::periodic 0, 60, 0, sub { |
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22 | warn "is called every minute, on the minute, exactly"; |
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23 | }; |
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24 | |
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25 | # IO |
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26 | |
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27 | my $w = EV::io *STDIN, EV::READ, sub { |
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28 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
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29 | warn "stdin is readable, you entered: ", <STDIN>; |
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30 | }; |
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31 | |
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32 | # SIGNALS |
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33 | |
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34 | my $w = EV::signal 'QUIT', sub { |
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35 | warn "sigquit received\n"; |
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36 | }; |
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37 | |
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38 | # CHILD/PID STATUS CHANGES |
8 | |
39 | |
9 | # TIMERS |
40 | my $w = EV::child 666, 0, sub { |
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41 | my ($w, $revents) = @_; |
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42 | my $status = $w->rstatus; |
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43 | }; |
10 | |
44 | |
11 | my $w = EV::timer 2, 0, sub { |
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12 | warn "is called after 2s"; |
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13 | }; |
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14 | |
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15 | my $w = EV::timer 2, 2, sub { |
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16 | warn "is called roughly every 2s (repeat = 2)"; |
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17 | }; |
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18 | |
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19 | undef $w; # destroy event watcher again |
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20 | |
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21 | my $w = EV::periodic 0, 60, 0, sub { |
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22 | warn "is called every minute, on the minute, exactly"; |
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23 | }; |
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24 | |
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25 | # IO |
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26 | |
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27 | my $w = EV::io *STDIN, EV::READ, sub { |
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28 | my ($w, $revents) = @_; # all callbacks receive the watcher and event mask |
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29 | warn "stdin is readable, you entered: ", <STDIN>; |
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30 | }; |
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31 | |
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32 | # SIGNALS |
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33 | |
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34 | my $w = EV::signal 'QUIT', sub { |
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35 | warn "sigquit received\n"; |
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36 | }; |
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37 | |
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38 | # CHILD/PID STATUS CHANGES |
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39 | |
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40 | my $w = EV::child 666, 0, sub { |
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41 | my ($w, $revents) = @_; |
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42 | my $status = $w->rstatus; |
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43 | }; |
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44 | |
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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 | |
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 |
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74 | package EV; |
74 | package EV; |
75 | |
75 | |
76 | use strict; |
76 | use strict; |
77 | |
77 | |
78 | BEGIN { |
78 | BEGIN { |
79 | our $VERSION = '3.41'; |
79 | our $VERSION = '3.42'; |
80 | use XSLoader; |
80 | use XSLoader; |
81 | XSLoader::load "EV", $VERSION; |
81 | XSLoader::load "EV", $VERSION; |
82 | } |
82 | } |
83 | |
83 | |
84 | @EV::IO::ISA = |
84 | @EV::IO::ISA = |
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283 | |
283 | |
284 | A watcher is an object that gets created to record your interest in some |
284 | A watcher is an object that gets created to record your interest in some |
285 | event. For instance, if you want to wait for STDIN to become readable, you |
285 | event. For instance, if you want to wait for STDIN to become readable, you |
286 | would create an EV::io watcher for that: |
286 | would create an EV::io watcher for that: |
287 | |
287 | |
288 | my $watcher = EV::io *STDIN, EV::READ, sub { |
288 | my $watcher = EV::io *STDIN, EV::READ, sub { |
289 | my ($watcher, $revents) = @_; |
289 | my ($watcher, $revents) = @_; |
290 | warn "yeah, STDIN should now be readable without blocking!\n" |
290 | warn "yeah, STDIN should now be readable without blocking!\n" |
291 | }; |
291 | }; |
292 | |
292 | |
293 | All watchers can be active (waiting for events) or inactive (paused). Only |
293 | All watchers can be active (waiting for events) or inactive (paused). Only |
294 | active watchers will have their callbacks invoked. All callbacks will be |
294 | active watchers will have their callbacks invoked. All callbacks will be |
295 | called with at least two arguments: the watcher and a bitmask of received |
295 | called with at least two arguments: the watcher and a bitmask of received |
296 | events. |
296 | events. |
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409 | Example: Register an I/O watcher for some UDP socket but do not keep the |
409 | Example: Register an I/O watcher for some UDP socket but do not keep the |
410 | event loop from running just because of that watcher. |
410 | event loop from running just because of that watcher. |
411 | |
411 | |
412 | my $udp_socket = ... |
412 | my $udp_socket = ... |
413 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
413 | my $udp_watcher = EV::io $udp_socket, EV::READ, sub { ... }; |
414 | $1000udp_watcher->keepalive (0); |
414 | $udp_watcher->keepalive (0); |
415 | |
415 | |
416 | =item $loop = $w->loop |
416 | =item $loop = $w->loop |
417 | |
417 | |
418 | Return the loop that this watcher is attached to. |
418 | Return the loop that this watcher is attached to. |
419 | |
419 | |
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951 | for more details. |
951 | for more details. |
952 | |
952 | |
953 | In short, this watcher is most useful on BSD systems without working |
953 | In short, this watcher is most useful on BSD systems without working |
954 | kqueue to still be able to handle a large number of sockets: |
954 | kqueue to still be able to handle a large number of sockets: |
955 | |
955 | |
956 | my $socket_loop; |
956 | my $socket_loop; |
957 | |
957 | |
958 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
958 | # check wether we use SELECT or POLL _and_ KQUEUE is supported |
959 | if ( |
959 | if ( |
960 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
960 | (EV::backend & (EV::BACKEND_POLL | EV::BACKEND_SELECT)) |
961 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
961 | && (EV::supported_backends & EV::embeddable_backends & EV::BACKEND_KQUEUE) |
962 | ) { |
962 | ) { |
963 | # use kqueue for sockets |
963 | # use kqueue for sockets |
964 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
964 | $socket_loop = new EV::Loop EV::BACKEND_KQUEUE | EV::FLAG_NOENV; |
965 | } |
965 | } |
966 | |
966 | |
967 | # use the default loop otherwise |
967 | # use the default loop otherwise |
968 | $socket_loop ||= EV::default_loop; |
968 | $socket_loop ||= EV::default_loop; |
969 | |
969 | |
970 | =over 4 |
970 | =over 4 |
971 | |
971 | |
972 | =item $w = EV::embed $otherloop, $callback |
972 | =item $w = EV::embed $otherloop, $callback |
973 | |
973 | |
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1069 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
1069 | coroutines with EV), L<Net::SNMP::EV> (asynchronous SNMP), L<AnyEvent> for |
1070 | event-loop agnostic and portable event driven programming. |
1070 | event-loop agnostic and portable event driven programming. |
1071 | |
1071 | |
1072 | =head1 AUTHOR |
1072 | =head1 AUTHOR |
1073 | |
1073 | |
1074 | Marc Lehmann <schmorp@schmorp.de> |
1074 | Marc Lehmann <schmorp@schmorp.de> |
1075 | http://home.schmorp.de/ |
1075 | http://home.schmorp.de/ |
1076 | |
1076 | |
1077 | =cut |
1077 | =cut |
1078 | |
1078 | |