1 | =head1 NAME |
1 | =head1 NAME |
2 | |
2 | |
3 | AnyEvent - provide framework for multiple event loops |
3 | AnyEvent - provide framework for multiple event loops |
4 | |
4 | |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt, POE - various supported event loops |
5 | EV, Event, Glib, Tk, Perl, Event::Lib, Qt and POE are various supported |
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6 | event loops. |
6 | |
7 | |
7 | =head1 SYNOPSIS |
8 | =head1 SYNOPSIS |
8 | |
9 | |
9 | use AnyEvent; |
10 | use AnyEvent; |
10 | |
11 | |
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12 | # file descriptor readable |
11 | my $w = AnyEvent->io (fh => $fh, poll => "r|w", cb => sub { ... }); |
13 | my $w = AnyEvent->io (fh => $fh, poll => "r", cb => sub { ... }); |
12 | |
14 | |
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15 | # one-shot or repeating timers |
13 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
16 | my $w = AnyEvent->timer (after => $seconds, cb => sub { ... }); |
14 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
17 | my $w = AnyEvent->timer (after => $seconds, interval => $seconds, cb => ... |
15 | |
18 | |
16 | print AnyEvent->now; # prints current event loop time |
19 | print AnyEvent->now; # prints current event loop time |
17 | print AnyEvent->time; # think Time::HiRes::time or simply CORE::time. |
20 | print AnyEvent->time; # think Time::HiRes::time or simply CORE::time. |
18 | |
21 | |
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22 | # POSIX signal |
19 | my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... }); |
23 | my $w = AnyEvent->signal (signal => "TERM", cb => sub { ... }); |
20 | |
24 | |
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25 | # child process exit |
21 | my $w = AnyEvent->child (pid => $pid, cb => sub { |
26 | my $w = AnyEvent->child (pid => $pid, cb => sub { |
22 | my ($pid, $status) = @_; |
27 | my ($pid, $status) = @_; |
23 | ... |
28 | ... |
24 | }); |
29 | }); |
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30 | |
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31 | # called when event loop idle (if applicable) |
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32 | my $w = AnyEvent->idle (cb => sub { ... }); |
25 | |
33 | |
26 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
34 | my $w = AnyEvent->condvar; # stores whether a condition was flagged |
27 | $w->send; # wake up current and all future recv's |
35 | $w->send; # wake up current and all future recv's |
28 | $w->recv; # enters "main loop" till $condvar gets ->send |
36 | $w->recv; # enters "main loop" till $condvar gets ->send |
29 | # use a condvar in callback mode: |
37 | # use a condvar in callback mode: |
… | |
… | |
319 | |
327 | |
320 | In either case, if you care (and in most cases, you don't), then you |
328 | In either case, if you care (and in most cases, you don't), then you |
321 | can get whatever behaviour you want with any event loop, by taking the |
329 | can get whatever behaviour you want with any event loop, by taking the |
322 | difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into |
330 | difference between C<< AnyEvent->time >> and C<< AnyEvent->now >> into |
323 | account. |
331 | account. |
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332 | |
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333 | =item AnyEvent->now_update |
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334 | |
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335 | Some event loops (such as L<EV> or L<AnyEvent::Impl::Perl>) cache |
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336 | the current time for each loop iteration (see the discussion of L<< |
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337 | AnyEvent->now >>, above). |
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338 | |
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339 | When a callback runs for a long time (or when the process sleeps), then |
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340 | this "current" time will differ substantially from the real time, which |
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341 | might affect timers and time-outs. |
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342 | |
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343 | When this is the case, you can call this method, which will update the |
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344 | event loop's idea of "current time". |
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345 | |
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346 | Note that updating the time I<might> cause some events to be handled. |
324 | |
347 | |
325 | =back |
348 | =back |
326 | |
349 | |
327 | =head2 SIGNAL WATCHERS |
350 | =head2 SIGNAL WATCHERS |
328 | |
351 | |
… | |
… | |
395 | ); |
418 | ); |
396 | |
419 | |
397 | # do something else, then wait for process exit |
420 | # do something else, then wait for process exit |
398 | $done->recv; |
421 | $done->recv; |
399 | |
422 | |
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423 | =head2 IDLE WATCHERS |
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424 | |
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425 | Sometimes there is a need to do something, but it is not so important |
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426 | to do it instantly, but only when there is nothing better to do. This |
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427 | "nothing better to do" is usually defined to be "no other events need |
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428 | attention by the event loop". |
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429 | |
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430 | Idle watchers ideally get invoked when the event loop has nothing |
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431 | better to do, just before it would block the process to wait for new |
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432 | events. Instead of blocking, the idle watcher is invoked. |
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433 | |
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434 | Most event loops unfortunately do not really support idle watchers (only |
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435 | EV, Event and Glib do it in a usable fashion) - for the rest, AnyEvent |
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436 | will simply call the callback "from time to time". |
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437 | |
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438 | Example: read lines from STDIN, but only process them when the |
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439 | program is otherwise idle: |
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440 | |
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441 | my @lines; # read data |
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442 | my $idle_w; |
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443 | my $io_w = AnyEvent->io (fh => \*STDIN, poll => 'r', cb => sub { |
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444 | push @lines, scalar <STDIN>; |
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445 | |
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446 | # start an idle watcher, if not already done |
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447 | $idle_w ||= AnyEvent->idle (cb => sub { |
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448 | # handle only one line, when there are lines left |
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449 | if (my $line = shift @lines) { |
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450 | print "handled when idle: $line"; |
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451 | } else { |
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452 | # otherwise disable the idle watcher again |
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453 | undef $idle_w; |
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454 | } |
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455 | }); |
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456 | }); |
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457 | |
400 | =head2 CONDITION VARIABLES |
458 | =head2 CONDITION VARIABLES |
401 | |
459 | |
402 | If you are familiar with some event loops you will know that all of them |
460 | If you are familiar with some event loops you will know that all of them |
403 | require you to run some blocking "loop", "run" or similar function that |
461 | require you to run some blocking "loop", "run" or similar function that |
404 | will actively watch for new events and call your callbacks. |
462 | will actively watch for new events and call your callbacks. |
… | |
… | |
873 | no warnings; |
931 | no warnings; |
874 | use strict qw(vars subs); |
932 | use strict qw(vars subs); |
875 | |
933 | |
876 | use Carp; |
934 | use Carp; |
877 | |
935 | |
878 | our $VERSION = 4.35; |
936 | our $VERSION = 4.412; |
879 | our $MODEL; |
937 | our $MODEL; |
880 | |
938 | |
881 | our $AUTOLOAD; |
939 | our $AUTOLOAD; |
882 | our @ISA; |
940 | our @ISA; |
883 | |
941 | |
884 | our @REGISTRY; |
942 | our @REGISTRY; |
885 | |
943 | |
886 | our $WIN32; |
944 | our $WIN32; |
887 | |
945 | |
888 | BEGIN { |
946 | BEGIN { |
889 | my $win32 = ! ! ($^O =~ /mswin32/i); |
947 | eval "sub WIN32(){ " . (($^O =~ /mswin32/i)*1) ." }"; |
890 | eval "sub WIN32(){ $win32 }"; |
948 | eval "sub TAINT(){ " . (${^TAINT}*1) . " }"; |
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|
949 | |
|
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950 | delete @ENV{grep /^PERL_ANYEVENT_/, keys %ENV} |
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951 | if ${^TAINT}; |
891 | } |
952 | } |
892 | |
953 | |
893 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
954 | our $verbose = $ENV{PERL_ANYEVENT_VERBOSE}*1; |
894 | |
955 | |
895 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
956 | our %PROTOCOL; # (ipv4|ipv6) => (1|2), higher numbers are preferred |
… | |
… | |
915 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
976 | [POE::Kernel:: => AnyEvent::Impl::POE::], # lasciate ogni speranza |
916 | [Wx:: => AnyEvent::Impl::POE::], |
977 | [Wx:: => AnyEvent::Impl::POE::], |
917 | [Prima:: => AnyEvent::Impl::POE::], |
978 | [Prima:: => AnyEvent::Impl::POE::], |
918 | ); |
979 | ); |
919 | |
980 | |
920 | our %method = map +($_ => 1), qw(io timer time now signal child condvar one_event DESTROY); |
981 | our %method = map +($_ => 1), |
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|
982 | qw(io timer time now now_update signal child idle condvar one_event DESTROY); |
921 | |
983 | |
922 | our @post_detect; |
984 | our @post_detect; |
923 | |
985 | |
924 | sub post_detect(&) { |
986 | sub post_detect(&) { |
925 | my ($cb) = @_; |
987 | my ($cb) = @_; |
… | |
… | |
930 | 1 |
992 | 1 |
931 | } else { |
993 | } else { |
932 | push @post_detect, $cb; |
994 | push @post_detect, $cb; |
933 | |
995 | |
934 | defined wantarray |
996 | defined wantarray |
935 | ? bless \$cb, "AnyEvent::Util::PostDetect" |
997 | ? bless \$cb, "AnyEvent::Util::postdetect" |
936 | : () |
998 | : () |
937 | } |
999 | } |
938 | } |
1000 | } |
939 | |
1001 | |
940 | sub AnyEvent::Util::PostDetect::DESTROY { |
1002 | sub AnyEvent::Util::postdetect::DESTROY { |
941 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
1003 | @post_detect = grep $_ != ${$_[0]}, @post_detect; |
942 | } |
1004 | } |
943 | |
1005 | |
944 | sub detect() { |
1006 | sub detect() { |
945 | unless ($MODEL) { |
1007 | unless ($MODEL) { |
… | |
… | |
982 | last; |
1044 | last; |
983 | } |
1045 | } |
984 | } |
1046 | } |
985 | |
1047 | |
986 | $MODEL |
1048 | $MODEL |
987 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib."; |
1049 | or die "No event module selected for AnyEvent and autodetect failed. Install any one of these modules: EV, Event or Glib.\n"; |
988 | } |
1050 | } |
989 | } |
1051 | } |
990 | |
1052 | |
991 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
1053 | push @{"$MODEL\::ISA"}, "AnyEvent::Base"; |
992 | |
1054 | |
… | |
… | |
1022 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") |
1084 | my ($rw, $mode) = $poll eq "r" ? ($r, "<") |
1023 | : $poll eq "w" ? ($w, ">") |
1085 | : $poll eq "w" ? ($w, ">") |
1024 | : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'"; |
1086 | : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'"; |
1025 | |
1087 | |
1026 | open my $fh2, "$mode&" . fileno $fh |
1088 | open my $fh2, "$mode&" . fileno $fh |
1027 | or die "cannot dup() filehandle: $!"; |
1089 | or die "cannot dup() filehandle: $!,"; |
1028 | |
1090 | |
1029 | # we assume CLOEXEC is already set by perl in all important cases |
1091 | # we assume CLOEXEC is already set by perl in all important cases |
1030 | |
1092 | |
1031 | ($fh2, $rw) |
1093 | ($fh2, $rw) |
1032 | } |
1094 | } |
1033 | |
1095 | |
1034 | package AnyEvent::Base; |
1096 | package AnyEvent::Base; |
1035 | |
1097 | |
1036 | # default implementation for now and time |
1098 | # default implementations for many methods |
1037 | |
1099 | |
1038 | BEGIN { |
1100 | BEGIN { |
1039 | if (eval "use Time::HiRes (); time (); 1") { |
1101 | if (eval "use Time::HiRes (); Time::HiRes::time (); 1") { |
1040 | *_time = \&Time::HiRes::time; |
1102 | *_time = \&Time::HiRes::time; |
1041 | # if (eval "use POSIX (); (POSIX::times())... |
1103 | # if (eval "use POSIX (); (POSIX::times())... |
1042 | } else { |
1104 | } else { |
1043 | *_time = sub { time }; # epic fail |
1105 | *_time = sub { time }; # epic fail |
1044 | } |
1106 | } |
1045 | } |
1107 | } |
1046 | |
1108 | |
1047 | sub time { _time } |
1109 | sub time { _time } |
1048 | sub now { _time } |
1110 | sub now { _time } |
|
|
1111 | sub now_update { } |
1049 | |
1112 | |
1050 | # default implementation for ->condvar |
1113 | # default implementation for ->condvar |
1051 | |
1114 | |
1052 | sub condvar { |
1115 | sub condvar { |
1053 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: |
1116 | bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, "AnyEvent::CondVar" |
1054 | } |
1117 | } |
1055 | |
1118 | |
1056 | # default implementation for ->signal |
1119 | # default implementation for ->signal |
1057 | |
1120 | |
1058 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
1121 | our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO); |
… | |
… | |
1082 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case |
1145 | AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case |
1083 | } else { |
1146 | } else { |
1084 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1147 | pipe $SIGPIPE_R, $SIGPIPE_W; |
1085 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1148 | fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R; |
1086 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
1149 | fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case |
|
|
1150 | |
|
|
1151 | # not strictly required, as $^F is normally 2, but let's make sure... |
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|
1152 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
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|
1153 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
1087 | } |
1154 | } |
1088 | |
1155 | |
1089 | $SIGPIPE_R |
1156 | $SIGPIPE_R |
1090 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1157 | or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n"; |
1091 | |
|
|
1092 | # not strictly required, as $^F is normally 2, but let's make sure... |
|
|
1093 | fcntl $SIGPIPE_R, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
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|
1094 | fcntl $SIGPIPE_W, &Fcntl::F_SETFD, &Fcntl::FD_CLOEXEC; |
|
|
1095 | |
1158 | |
1096 | $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec); |
1159 | $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec); |
1097 | } |
1160 | } |
1098 | |
1161 | |
1099 | my $signal = uc $arg{signal} |
1162 | my $signal = uc $arg{signal} |
… | |
… | |
1104 | local $!; |
1167 | local $!; |
1105 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1168 | syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV; |
1106 | undef $SIG_EV{$signal}; |
1169 | undef $SIG_EV{$signal}; |
1107 | }; |
1170 | }; |
1108 | |
1171 | |
1109 | bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" |
1172 | bless [$signal, $arg{cb}], "AnyEvent::Base::signal" |
1110 | } |
1173 | } |
1111 | |
1174 | |
1112 | sub AnyEvent::Base::Signal::DESTROY { |
1175 | sub AnyEvent::Base::signal::DESTROY { |
1113 | my ($signal, $cb) = @{$_[0]}; |
1176 | my ($signal, $cb) = @{$_[0]}; |
1114 | |
1177 | |
1115 | delete $SIG_CB{$signal}{$cb}; |
1178 | delete $SIG_CB{$signal}{$cb}; |
1116 | |
1179 | |
|
|
1180 | # delete doesn't work with older perls - they then |
|
|
1181 | # print weird messages, or just unconditionally exit |
|
|
1182 | # instead of getting the default action. |
1117 | delete $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
1183 | undef $SIG{$signal} unless keys %{ $SIG_CB{$signal} }; |
1118 | } |
1184 | } |
1119 | |
1185 | |
1120 | # default implementation for ->child |
1186 | # default implementation for ->child |
1121 | |
1187 | |
1122 | our %PID_CB; |
1188 | our %PID_CB; |
1123 | our $CHLD_W; |
1189 | our $CHLD_W; |
1124 | our $CHLD_DELAY_W; |
1190 | our $CHLD_DELAY_W; |
1125 | our $PID_IDLE; |
|
|
1126 | our $WNOHANG; |
1191 | our $WNOHANG; |
1127 | |
1192 | |
1128 | sub _child_wait { |
1193 | sub _sigchld { |
1129 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
1194 | while (0 < (my $pid = waitpid -1, $WNOHANG)) { |
1130 | $_->($pid, $?) for (values %{ $PID_CB{$pid} || {} }), |
1195 | $_->($pid, $?) for (values %{ $PID_CB{$pid} || {} }), |
1131 | (values %{ $PID_CB{0} || {} }); |
1196 | (values %{ $PID_CB{0} || {} }); |
1132 | } |
1197 | } |
1133 | |
|
|
1134 | undef $PID_IDLE; |
|
|
1135 | } |
|
|
1136 | |
|
|
1137 | sub _sigchld { |
|
|
1138 | # make sure we deliver these changes "synchronous" with the event loop. |
|
|
1139 | $CHLD_DELAY_W ||= AnyEvent->timer (after => 0, cb => sub { |
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|
1140 | undef $CHLD_DELAY_W; |
|
|
1141 | &_child_wait; |
|
|
1142 | }); |
|
|
1143 | } |
1198 | } |
1144 | |
1199 | |
1145 | sub child { |
1200 | sub child { |
1146 | my (undef, %arg) = @_; |
1201 | my (undef, %arg) = @_; |
1147 | |
1202 | |
1148 | defined (my $pid = $arg{pid} + 0) |
1203 | defined (my $pid = $arg{pid} + 0) |
1149 | or Carp::croak "required option 'pid' is missing"; |
1204 | or Carp::croak "required option 'pid' is missing"; |
1150 | |
1205 | |
1151 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1206 | $PID_CB{$pid}{$arg{cb}} = $arg{cb}; |
1152 | |
1207 | |
1153 | unless ($WNOHANG) { |
|
|
1154 | $WNOHANG = eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1208 | $WNOHANG ||= eval { local $SIG{__DIE__}; require POSIX; &POSIX::WNOHANG } || 1; |
1155 | } |
|
|
1156 | |
1209 | |
1157 | unless ($CHLD_W) { |
1210 | unless ($CHLD_W) { |
1158 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1211 | $CHLD_W = AnyEvent->signal (signal => 'CHLD', cb => \&_sigchld); |
1159 | # child could be a zombie already, so make at least one round |
1212 | # child could be a zombie already, so make at least one round |
1160 | &_sigchld; |
1213 | &_sigchld; |
1161 | } |
1214 | } |
1162 | |
1215 | |
1163 | bless [$pid, $arg{cb}], "AnyEvent::Base::Child" |
1216 | bless [$pid, $arg{cb}], "AnyEvent::Base::child" |
1164 | } |
1217 | } |
1165 | |
1218 | |
1166 | sub AnyEvent::Base::Child::DESTROY { |
1219 | sub AnyEvent::Base::child::DESTROY { |
1167 | my ($pid, $cb) = @{$_[0]}; |
1220 | my ($pid, $cb) = @{$_[0]}; |
1168 | |
1221 | |
1169 | delete $PID_CB{$pid}{$cb}; |
1222 | delete $PID_CB{$pid}{$cb}; |
1170 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1223 | delete $PID_CB{$pid} unless keys %{ $PID_CB{$pid} }; |
1171 | |
1224 | |
1172 | undef $CHLD_W unless keys %PID_CB; |
1225 | undef $CHLD_W unless keys %PID_CB; |
|
|
1226 | } |
|
|
1227 | |
|
|
1228 | # idle emulation is done by simply using a timer, regardless |
|
|
1229 | # of whether the process is idle or not, and not letting |
|
|
1230 | # the callback use more than 50% of the time. |
|
|
1231 | sub idle { |
|
|
1232 | my (undef, %arg) = @_; |
|
|
1233 | |
|
|
1234 | my ($cb, $w, $rcb) = $arg{cb}; |
|
|
1235 | |
|
|
1236 | $rcb = sub { |
|
|
1237 | if ($cb) { |
|
|
1238 | $w = _time; |
|
|
1239 | &$cb; |
|
|
1240 | $w = _time - $w; |
|
|
1241 | |
|
|
1242 | # never use more then 50% of the time for the idle watcher, |
|
|
1243 | # within some limits |
|
|
1244 | $w = 0.0001 if $w < 0.0001; |
|
|
1245 | $w = 5 if $w > 5; |
|
|
1246 | |
|
|
1247 | $w = AnyEvent->timer (after => $w, cb => $rcb); |
|
|
1248 | } else { |
|
|
1249 | # clean up... |
|
|
1250 | undef $w; |
|
|
1251 | undef $rcb; |
|
|
1252 | } |
|
|
1253 | }; |
|
|
1254 | |
|
|
1255 | $w = AnyEvent->timer (after => 0.05, cb => $rcb); |
|
|
1256 | |
|
|
1257 | bless \\$cb, "AnyEvent::Base::idle" |
|
|
1258 | } |
|
|
1259 | |
|
|
1260 | sub AnyEvent::Base::idle::DESTROY { |
|
|
1261 | undef $${$_[0]}; |
1173 | } |
1262 | } |
1174 | |
1263 | |
1175 | package AnyEvent::CondVar; |
1264 | package AnyEvent::CondVar; |
1176 | |
1265 | |
1177 | our @ISA = AnyEvent::CondVar::Base::; |
1266 | our @ISA = AnyEvent::CondVar::Base::; |
… | |
… | |
1251 | so on. |
1340 | so on. |
1252 | |
1341 | |
1253 | =head1 ENVIRONMENT VARIABLES |
1342 | =head1 ENVIRONMENT VARIABLES |
1254 | |
1343 | |
1255 | The following environment variables are used by this module or its |
1344 | The following environment variables are used by this module or its |
1256 | submodules: |
1345 | submodules. |
|
|
1346 | |
|
|
1347 | Note that AnyEvent will remove I<all> environment variables starting with |
|
|
1348 | C<PERL_ANYEVENT_> from C<%ENV> when it is loaded while taint mode is |
|
|
1349 | enabled. |
1257 | |
1350 | |
1258 | =over 4 |
1351 | =over 4 |
1259 | |
1352 | |
1260 | =item C<PERL_ANYEVENT_VERBOSE> |
1353 | =item C<PERL_ANYEVENT_VERBOSE> |
1261 | |
1354 | |
… | |
… | |
1801 | =item * C-based event loops perform very well with small number of |
1894 | =item * C-based event loops perform very well with small number of |
1802 | watchers, as the management overhead dominates. |
1895 | watchers, as the management overhead dominates. |
1803 | |
1896 | |
1804 | =back |
1897 | =back |
1805 | |
1898 | |
|
|
1899 | =head2 THE IO::Lambda BENCHMARK |
|
|
1900 | |
|
|
1901 | Recently I was told about the benchmark in the IO::Lambda manpage, which |
|
|
1902 | could be misinterpreted to make AnyEvent look bad. In fact, the benchmark |
|
|
1903 | simply compares IO::Lambda with POE, and IO::Lambda looks better (which |
|
|
1904 | shouldn't come as a surprise to anybody). As such, the benchmark is |
|
|
1905 | fine, and shows that the AnyEvent backend from IO::Lambda isn't very |
|
|
1906 | optimal. But how would AnyEvent compare when used without the extra |
|
|
1907 | baggage? To explore this, I wrote the equivalent benchmark for AnyEvent. |
|
|
1908 | |
|
|
1909 | The benchmark itself creates an echo-server, and then, for 500 times, |
|
|
1910 | connects to the echo server, sends a line, waits for the reply, and then |
|
|
1911 | creates the next connection. This is a rather bad benchmark, as it doesn't |
|
|
1912 | test the efficiency of the framework, but it is a benchmark nevertheless. |
|
|
1913 | |
|
|
1914 | name runtime |
|
|
1915 | Lambda/select 0.330 sec |
|
|
1916 | + optimized 0.122 sec |
|
|
1917 | Lambda/AnyEvent 0.327 sec |
|
|
1918 | + optimized 0.138 sec |
|
|
1919 | Raw sockets/select 0.077 sec |
|
|
1920 | POE/select, components 0.662 sec |
|
|
1921 | POE/select, raw sockets 0.226 sec |
|
|
1922 | POE/select, optimized 0.404 sec |
|
|
1923 | |
|
|
1924 | AnyEvent/select/nb 0.085 sec |
|
|
1925 | AnyEvent/EV/nb 0.068 sec |
|
|
1926 | +state machine 0.134 sec |
|
|
1927 | |
|
|
1928 | The benchmark is also a bit unfair (my fault) - the IO::Lambda |
|
|
1929 | benchmarks actually make blocking connects and use 100% blocking I/O, |
|
|
1930 | defeating the purpose of an event-based solution. All of the newly |
|
|
1931 | written AnyEvent benchmarks use 100% non-blocking connects (using |
|
|
1932 | AnyEvent::Socket::tcp_connect and the asynchronous pure perl DNS |
|
|
1933 | resolver), so AnyEvent is at a disadvantage here as non-blocking connects |
|
|
1934 | generally require a lot more bookkeeping and event handling than blocking |
|
|
1935 | connects (which involve a single syscall only). |
|
|
1936 | |
|
|
1937 | The last AnyEvent benchmark additionally uses L<AnyEvent::Handle>, which |
|
|
1938 | offers similar expressive power as POE and IO::Lambda (using conventional |
|
|
1939 | Perl syntax), which means both the echo server and the client are 100% |
|
|
1940 | non-blocking w.r.t. I/O, further placing it at a disadvantage. |
|
|
1941 | |
|
|
1942 | As you can see, AnyEvent + EV even beats the hand-optimised "raw sockets |
|
|
1943 | benchmark", while AnyEvent + its pure perl backend easily beats |
|
|
1944 | IO::Lambda and POE. |
|
|
1945 | |
|
|
1946 | And even the 100% non-blocking version written using the high-level (and |
|
|
1947 | slow :) L<AnyEvent::Handle> abstraction beats both POE and IO::Lambda, |
|
|
1948 | even thought it does all of DNS, tcp-connect and socket I/O in a |
|
|
1949 | non-blocking way. |
|
|
1950 | |
|
|
1951 | The two AnyEvent benchmarks can be found as F<eg/ae0.pl> and F<eg/ae2.pl> |
|
|
1952 | in the AnyEvent distribution, the remaining benchmarks are part of the |
|
|
1953 | IO::lambda distribution and were used without any changes. |
|
|
1954 | |
1806 | |
1955 | |
1807 | =head1 SIGNALS |
1956 | =head1 SIGNALS |
1808 | |
1957 | |
1809 | AnyEvent currently installs handlers for these signals: |
1958 | AnyEvent currently installs handlers for these signals: |
1810 | |
1959 | |
… | |
… | |
1867 | use AnyEvent; |
2016 | use AnyEvent; |
1868 | |
2017 | |
1869 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
2018 | Similar considerations apply to $ENV{PERL_ANYEVENT_VERBOSE}, as that can |
1870 | be used to probe what backend is used and gain other information (which is |
2019 | be used to probe what backend is used and gain other information (which is |
1871 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and |
2020 | probably even less useful to an attacker than PERL_ANYEVENT_MODEL), and |
1872 | $ENV{PERL_ANYEGENT_STRICT}. |
2021 | $ENV{PERL_ANYEVENT_STRICT}. |
1873 | |
2022 | |
1874 | |
2023 | |
1875 | =head1 BUGS |
2024 | =head1 BUGS |
1876 | |
2025 | |
1877 | Perl 5.8 has numerous memleaks that sometimes hit this module and are hard |
2026 | Perl 5.8 has numerous memleaks that sometimes hit this module and are hard |