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6 | |
6 | |
7 | =head1 SYNOPSIS |
7 | =head1 SYNOPSIS |
8 | |
8 | |
9 | use AnyEvent; |
9 | use AnyEvent; |
10 | |
10 | |
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11 | # file descriptor readable |
11 | my $w = AnyEvent->io (fh => $fh, poll => "r|w", cb => sub { ... }); |
12 | my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... }); |
12 | |
13 | |
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14 | # one-shot or repeating timers |
13 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
15 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
14 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
16 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
15 | |
17 | |
16 | print AnyEvent->now; # prints current event loop time |
18 | print AnyEvent->now; # prints current event loop time |
17 | print AnyEvent->time; # think Time::HiRes::time or simply CORE::time. |
19 | print AnyEvent->time; # think Time::HiRes::time or simply CORE::time. |
18 | |
20 | |
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21 | # POSIX signal |
19 | my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... }); |
22 | my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... }); |
20 | |
23 | |
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24 | # child process exit |
21 | my $w = AnyEvent->child (pid => $pid, cb => sub { |
25 | my $w = AnyEvent->child (pid => $pid, cb => sub { |
22 | my ($pid, $status) = @_; |
26 | my ($pid, $status) = @_; |
23 | ... |
27 | ... |
24 | }); |
28 | }); |
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29 | |
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30 | # called when event loop idle (if applicable) |
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31 | my $w = AnyEvent->idle (cb => sub { ... }); |
25 | |
32 | |
26 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
33 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
27 | $w->send; # wake up current and all future recv's |
34 | $w->send; # wake up current and all future recv's |
28 | $w->recv; # enters "main loop" till $condvar gets ->send |
35 | $w->recv; # enters "main loop" till $condvar gets ->send |
29 | # use a condvar in callback mode: |
36 | # use a condvar in callback mode: |
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410 | ); |
417 | ); |
411 | |
418 | |
412 | # do something else, then wait for process exit |
419 | # do something else, then wait for process exit |
413 | $done->recv; |
420 | $done->recv; |
414 | |
421 | |
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422 | =head2 IDLE WATCHERS |
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423 | |
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424 | Sometimes there is a need to do something, but it is not so important |
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425 | to do it instantly, but only when there is nothing better to do. This |
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426 | "nothing better to do" is usually defined to be "no other events need |
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427 | attention by the event loop". |
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428 | |
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429 | Idle watchers ideally get invoked when the event loop has nothing |
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430 | better to do, just before it would block the process to wait for new |
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431 | events. Instead of blocking, the idle watcher is invoked. |
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432 | |
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433 | Most event loops unfortunately do not really support idle watchers (only |
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434 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
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435 | will simply call the callback "from time to time". |
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436 | |
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437 | Example: read lines from STDIN, but only process them when the |
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438 | program is otherwise idle: |
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439 | |
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440 | my @lines; # read data |
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441 | my $idle_w; |
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442 | my $io_w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
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443 | push @lines, scalar <STDIN>; |
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444 | |
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445 | # start an idle watcher, if not already done |
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446 | $idle_w ||= AnyEvent->idle (cb => sub { |
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447 | # handle only one line, when there are lines left |
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448 | if (my $line = shift @lines) { |
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449 | print "handled when idle: $line"; |
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450 | } else { |
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451 | # otherwise disable the idle watcher again |
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452 | undef $idle_w; |
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453 | } |
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454 | }); |
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455 | }); |
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456 | |
415 | =head2 CONDITION VARIABLES |
457 | =head2 CONDITION VARIABLES |
416 | |
458 | |
417 | If you are familiar with some event loops you will know that all of them |
459 | If you are familiar with some event loops you will know that all of them |
418 | require you to run some blocking "loop", "run" or similar function that |
460 | require you to run some blocking "loop", "run" or similar function that |
419 | will actively watch for new events and call your callbacks. |
461 | will actively watch for new events and call your callbacks. |
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888 | no warnings; |
930 | no warnings; |
889 | use strict qw(vars subs); |
931 | use strict qw(vars subs); |
890 | |
932 | |
891 | use Carp; |
933 | use Carp; |
892 | |
934 | |
893 | our $VERSION = 4.351; |
935 | our $VERSION = 4.4; |
894 | our $MODEL; |
936 | our $MODEL; |
895 | |
937 | |
896 | our $AUTOLOAD; |
938 | our $AUTOLOAD; |
897 | our @ISA; |
939 | our @ISA; |
898 | |
940 | |
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931 | [Wx:: => AnyEvent::Impl::POE::], |
973 | [Wx:: => AnyEvent::Impl::POE::], |
932 | [Prima:: => AnyEvent::Impl::POE::], |
974 | [Prima:: => AnyEvent::Impl::POE::], |
933 | ); |
975 | ); |
934 | |
976 | |
935 | our %method = map +($_ => 1), |
977 | our %method = map +($_ => 1), |
936 | qw(io timer time now now_update signal child condvar one_event DESTROY); |
978 | qw(io timer time now now_update signal child idle condvar one_event DESTROY); |
937 | |
979 | |
938 | our @post_detect; |
980 | our @post_detect; |
939 | |
981 | |
940 | sub post_detect(&) { |
982 | sub post_detect(&) { |
941 | my ($cb) = @_; |
983 | my ($cb) = @_; |
… | |
… | |
946 | 1 |
988 | 1 |
947 | } else { |
989 | } else { |
948 | push @post_detect, $cb; |
990 | push @post_detect, $cb; |
949 | |
991 | |
950 | defined wantarray |
992 | defined wantarray |
951 | ? bless \$cb, "AnyEvent::Util::PostDetect" |
993 | ? bless \$cb, "AnyEvent::Util::postdetect" |
952 | : () |
994 | : () |
953 | } |
995 | } |
954 | } |
996 | } |
955 | |
997 | |
956 | sub AnyEvent::Util::PostDetect::DESTROY { |
998 | sub AnyEvent::Util::postdetect::DESTROY { |
957 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
999 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
958 | } |
1000 | } |
959 | |
1001 | |
960 | sub detect() { |
1002 | sub detect() { |
961 | unless ($MODEL) { |
1003 | unless ($MODEL) { |
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1050 | package AnyEvent::Base; |
1092 | package AnyEvent::Base; |
1051 | |
1093 | |
1052 | # default implementations for many methods |
1094 | # default implementations for many methods |
1053 | |
1095 | |
1054 | BEGIN { |
1096 | BEGIN { |
1055 | if (eval "use Time::HiRes (); time (); 1") { |
1097 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
1056 | *_time = \&Time::HiRes::time; |
1098 | *_time = \&Time::HiRes::time; |
1057 | # if (eval "use POSIX (); (POSIX::times())... |
1099 | # if (eval "use POSIX (); (POSIX::times())... |
1058 | } else { |
1100 | } else { |
1059 | *_time = sub { time }; # epic fail |
1101 | *_time = sub { time }; # epic fail |
1060 | } |
1102 | } |
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1065 | sub now_update { } |
1107 | sub now_update { } |
1066 | |
1108 | |
1067 | # default implementation for ->condvar |
1109 | # default implementation for ->condvar |
1068 | |
1110 | |
1069 | sub condvar { |
1111 | sub condvar { |
1070 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
1112 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
1071 | } |
1113 | } |
1072 | |
1114 | |
1073 | # default implementation for ->signal |
1115 | # default implementation for ->signal |
1074 | |
1116 | |
1075 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
1117 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
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1121 | local $!; |
1163 | local $!; |
1122 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1164 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1123 | undef $SIG_EV{$signal}; |
1165 | undef $SIG_EV{$signal}; |
1124 | }; |
1166 | }; |
1125 | |
1167 | |
1126 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
1168 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
1127 | } |
1169 | } |
1128 | |
1170 | |
1129 | sub AnyEvent::Base::Signal::DESTROY { |
1171 | sub AnyEvent::Base::signal::DESTROY { |
1130 | my ($signal, $cb) = @{$_[0]}; |
1172 | my ($signal, $cb) = @{$_[0]}; |
1131 | |
1173 | |
1132 | delete $SIG_CB{$signal}{$cb}; |
1174 | delete $SIG_CB{$signal}{$cb}; |
1133 | |
1175 | |
1134 | delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
1176 | delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
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1175 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1217 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1176 | # child could be a zombie already, so make at least one round |
1218 | # child could be a zombie already, so make at least one round |
1177 | &_sigchld; |
1219 | &_sigchld; |
1178 | } |
1220 | } |
1179 | |
1221 | |
1180 | bless [$pid, $arg{cb}], "AnyEvent::Base::Child" |
1222 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
1181 | } |
1223 | } |
1182 | |
1224 | |
1183 | sub AnyEvent::Base::Child::DESTROY { |
1225 | sub AnyEvent::Base::child::DESTROY { |
1184 | my ($pid, $cb) = @{$_[0]}; |
1226 | my ($pid, $cb) = @{$_[0]}; |
1185 | |
1227 | |
1186 | delete $PID_CB{$pid}{$cb}; |
1228 | delete $PID_CB{$pid}{$cb}; |
1187 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1229 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1188 | |
1230 | |
1189 | undef $CHLD_W unless keys %PID_CB; |
1231 | undef $CHLD_W unless keys %PID_CB; |
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1232 | } |
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1233 | |
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1234 | # idle emulation is done by simply using a timer, regardless |
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1235 | # of whether the proces sis idle or not, and not letting |
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1236 | # the callback use more than 50% of the time. |
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1237 | sub idle { |
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1238 | my (undef, %arg) = @_; |
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1239 | |
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1240 | my ($cb, $w, $rcb) = $arg{cb}; |
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1241 | |
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1242 | $rcb = sub { |
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1243 | if ($cb) { |
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1244 | $w = _time; |
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1245 | &$cb; |
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1246 | $w = _time - $w; |
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1247 | |
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1248 | # never use more then 50% of the time for the idle watcher, |
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1249 | # within some limits |
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1250 | $w = 0.0001 if $w < 0.0001; |
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1251 | $w = 5 if $w > 5; |
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1252 | |
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1253 | $w = AnyEvent->timer (after => $w, cb => $rcb); |
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1254 | } else { |
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1255 | # clean up... |
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1256 | undef $w; |
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1257 | undef $rcb; |
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|
1258 | } |
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1259 | }; |
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1260 | |
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1261 | $w = AnyEvent->timer (after => 0.05, cb => $rcb); |
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1262 | |
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1263 | bless \\$cb, "AnyEvent::Base::idle" |
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1264 | } |
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1265 | |
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1266 | sub AnyEvent::Base::idle::DESTROY { |
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1267 | undef $${$_[0]}; |
1190 | } |
1268 | } |
1191 | |
1269 | |
1192 | package AnyEvent::CondVar; |
1270 | package AnyEvent::CondVar; |
1193 | |
1271 | |
1194 | our @ISA = AnyEvent::CondVar::Base::; |
1272 | our @ISA = AnyEvent::CondVar::Base::; |