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Comparing AnyEvent/lib/AnyEvent.pm (file contents):
Revision 1.192 by root, Tue Jan 6 20:08:05 2009 UTC vs.
Revision 1.197 by root, Thu Mar 26 15:51:44 2009 UTC

… …
136 136
137These watchers are normal Perl objects with normal Perl lifetime. After 137These watchers are normal Perl objects with normal Perl lifetime. After
138creating a watcher it will immediately "watch" for events and invoke the 138creating a watcher it will immediately "watch" for events and invoke the
139callback when the event occurs (of course, only when the event model 139callback when the event occurs (of course, only when the event model
140is in control). 140is in control).
141
142Note that B<callbacks must not permanently change global variables>
143potentially in use by the event loop (such as C<$_> or C<$[>) and that B<<
144callbacks must not C<die> >>. The former is good programming practise in
145Perl and the latter stems from the fact that exception handling differs
146widely between event loops.
141 147
142To disable the watcher you have to destroy it (e.g. by setting the 148To disable the watcher you have to destroy it (e.g. by setting the
143variable you store it in to C<undef> or otherwise deleting all references 149variable you store it in to C<undef> or otherwise deleting all references
144to it). 150to it).
145 151
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861no warnings; 867no warnings;
862use strict qw(vars subs); 868use strict qw(vars subs);
863 869
864use Carp; 870use Carp;
865 871
866our $VERSION = 4.331; 872our $VERSION = 4.341;
867our $MODEL; 873our $MODEL;
868 874
869our $AUTOLOAD; 875our $AUTOLOAD;
870our @ISA; 876our @ISA;
871 877
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1004# to support binding more than one watcher per filehandle (they usually 1010# to support binding more than one watcher per filehandle (they usually
1005# allow only one watcher per fd, so we dup it to get a different one). 1011# allow only one watcher per fd, so we dup it to get a different one).
1006sub _dupfh($$$$) { 1012sub _dupfh($$$$) {
1007 my ($poll, $fh, $r, $w) = @_; 1013 my ($poll, $fh, $r, $w) = @_;
1008 1014
1009 require Fcntl;
1010
1011 # cygwin requires the fh mode to be matching, unix doesn't 1015 # cygwin requires the fh mode to be matching, unix doesn't
1012 my ($rw, $mode) = $poll eq "r" ? ($r, "<") 1016 my ($rw, $mode) = $poll eq "r" ? ($r, "<")
1013 : $poll eq "w" ? ($w, ">") 1017 : $poll eq "w" ? ($w, ">")
1014 : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'"; 1018 : Carp::croak "AnyEvent->io requires poll set to either 'r' or 'w'";
1015 1019
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1043 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar:: 1047 bless { @_ == 3 ? (_ae_cb => $_[2]) : () }, AnyEvent::CondVar::
1044} 1048}
1045 1049
1046# default implementation for ->signal 1050# default implementation for ->signal
1047 1051
1048our %SIG_CB; 1052our ($SIGPIPE_R, $SIGPIPE_W, %SIG_CB, %SIG_EV, $SIG_IO);
1053
1054sub _signal_exec {
1055 while (%SIG_EV) {
1056 sysread $SIGPIPE_R, my $dummy, 4;
1057 for (keys %SIG_EV) {
1058 delete $SIG_EV{$_};
1059 $_->() for values %{ $SIG_CB{$_} || {} };
1060 }
1061 }
1062}
1049 1063
1050sub signal { 1064sub signal {
1051 my (undef, %arg) = @_; 1065 my (undef, %arg) = @_;
1052 1066
1067 unless ($SIGPIPE_R) {
1068 if (AnyEvent::WIN32) {
1069 ($SIGPIPE_R, $SIGPIPE_W) = AnyEvent::Util::portable_pipe ();
1070 AnyEvent::Util::fh_nonblocking ($SIGPIPE_R) if $SIGPIPE_R;
1071 AnyEvent::Util::fh_nonblocking ($SIGPIPE_W) if $SIGPIPE_W; # just in case
1072 } else {
1073 pipe $SIGPIPE_R, $SIGPIPE_W;
1074 require Fcntl;
1075 fcntl $SIGPIPE_R, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_R;
1076 fcntl $SIGPIPE_W, &Fcntl::F_SETFL, &Fcntl::O_NONBLOCK if $SIGPIPE_W; # just in case
1077 }
1078
1079 $SIGPIPE_R
1080 or Carp::croak "AnyEvent: unable to create a signal reporting pipe: $!\n";
1081
1082 $SIG_IO = AnyEvent->io (fh => $SIGPIPE_R, poll => "r", cb => \&_signal_exec);
1083 }
1084
1053 my $signal = uc $arg{signal} 1085 my $signal = uc $arg{signal}
1054 or Carp::croak "required option 'signal' is missing"; 1086 or Carp::croak "required option 'signal' is missing";
1055 1087
1056 $SIG_CB{$signal}{$arg{cb}} = $arg{cb}; 1088 $SIG_CB{$signal}{$arg{cb}} = $arg{cb};
1057 $SIG{$signal} ||= sub { 1089 $SIG{$signal} ||= sub {
1058 $_->() for values %{ $SIG_CB{$signal} || {} }; 1090 syswrite $SIGPIPE_W, "\x00", 1 unless %SIG_EV;
1091 undef $SIG_EV{$signal};
1059 }; 1092 };
1060 1093
1061 bless [$signal, $arg{cb}], "AnyEvent::Base::Signal" 1094 bless [$signal, $arg{cb}], "AnyEvent::Base::Signal"
1062} 1095}
1063 1096
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1263used, and preference will be given to protocols mentioned earlier in the 1296used, and preference will be given to protocols mentioned earlier in the
1264list. 1297list.
1265 1298
1266This variable can effectively be used for denial-of-service attacks 1299This variable can effectively be used for denial-of-service attacks
1267against local programs (e.g. when setuid), although the impact is likely 1300against local programs (e.g. when setuid), although the impact is likely
1268small, as the program has to handle connection errors already- 1301small, as the program has to handle conenction and other failures anyways.
1269 1302
1270Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6, 1303Examples: C<PERL_ANYEVENT_PROTOCOLS=ipv4,ipv6> - prefer IPv4 over IPv6,
1271but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4> 1304but support both and try to use both. C<PERL_ANYEVENT_PROTOCOLS=ipv4>
1272- only support IPv4, never try to resolve or contact IPv6 1305- only support IPv4, never try to resolve or contact IPv6
1273addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or 1306addresses. C<PERL_ANYEVENT_PROTOCOLS=ipv6,ipv4> support either IPv4 or
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1827=head1 BUGS 1860=head1 BUGS
1828 1861
1829Perl 5.8 has numerous memleaks that sometimes hit this module and are hard 1862Perl 5.8 has numerous memleaks that sometimes hit this module and are hard
1830to work around. If you suffer from memleaks, first upgrade to Perl 5.10 1863to work around. If you suffer from memleaks, first upgrade to Perl 5.10
1831and check wether the leaks still show up. (Perl 5.10.0 has other annoying 1864and check wether the leaks still show up. (Perl 5.10.0 has other annoying
1832mamleaks, such as leaking on C<map> and C<grep> but it is usually not as 1865memleaks, such as leaking on C<map> and C<grep> but it is usually not as
1833pronounced). 1866pronounced).
1834 1867
1835 1868
1836=head1 SEE ALSO 1869=head1 SEE ALSO
1837 1870

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