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=head1 NAME |
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|
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AnyEvent::Util - various utility functions. |
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|
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=head1 SYNOPSIS |
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|
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use AnyEvent::Util; |
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|
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=head1 DESCRIPTION |
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|
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This module implements various utility functions, mostly replacing |
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well-known functions by event-ised counterparts. |
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|
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All functions documented without C<AnyEvent::Util::> prefix are exported |
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by default. |
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|
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=over 4 |
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|
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=cut |
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|
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package AnyEvent::Util; |
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|
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no warnings; |
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use strict; |
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|
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use Carp (); |
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use Errno (); |
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use Socket (); |
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|
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use AnyEvent (); |
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|
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use base 'Exporter'; |
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|
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BEGIN { |
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*socket_inet_aton = \&Socket::inet_aton; # take a copy, in case Coro::LWP overrides it |
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} |
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|
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BEGIN { |
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my $af_inet6 = eval { &Socket::AF_INET6 }; |
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eval "sub AF_INET6() { $af_inet6 }"; die if $@; |
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|
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delete $AnyEvent::PROTOCOL{ipv6} unless $af_inet6; |
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} |
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|
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BEGIN { |
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# broken windows perls use undocumented error codes... |
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if ($^O =~ /mswin32/i) { |
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eval "sub WSAWOULDBLOCK() { 10035 }"; |
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eval "sub WSAEINPROGRESS() { 10036 }"; |
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} else { |
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eval "sub WSAWOULDBLOCK() { -1e99 }"; # should never match any errno value |
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eval "sub WSAEINPROGRESS() { -1e99 }"; # should never match any errno value |
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} |
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} |
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|
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our @EXPORT = qw(fh_nonblocking guard); |
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our @EXPORT_OK = qw(AF_INET6 WSAWOULDBLOCK WSAEINPROGRESS); |
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|
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our $VERSION = '1.0'; |
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|
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our $MAXPARALLEL = 16; # max. number of parallel jobs |
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|
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our $running; |
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our @queue; |
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|
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sub _schedule; |
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sub _schedule { |
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return unless @queue; |
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return if $running >= $MAXPARALLEL; |
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|
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++$running; |
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my ($cb, $sub, @args) = @{shift @queue}; |
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|
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if (eval { local $SIG{__DIE__}; require POSIX }) { |
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my $pid = open my $fh, "-|"; |
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|
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if (!defined $pid) { |
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die "fork: $!"; |
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} elsif (!$pid) { |
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syswrite STDOUT, join "\0", map { unpack "H*", $_ } $sub->(@args); |
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POSIX::_exit (0); |
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} |
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|
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my $w; $w = AnyEvent->io (fh => $fh, poll => 'r', cb => sub { |
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--$running; |
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_schedule; |
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undef $w; |
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|
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my $buf; |
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sysread $fh, $buf, 16384, length $buf; |
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$cb->(map { pack "H*", $_ } split /\0/, $buf); |
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}); |
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} else { |
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$cb->($sub->(@args)); |
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} |
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} |
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|
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sub _do_asy { |
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push @queue, [@_]; |
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_schedule; |
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} |
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|
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# to be removed |
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sub dotted_quad($) { |
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$_[0] =~ /^(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9][0-9]?) |
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\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9][0-9]?) |
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\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9][0-9]?) |
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\.(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9][0-9]?)$/x |
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} |
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|
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# just a forwarder |
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sub inet_aton { |
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require AnyEvent::Socket; |
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*inet_aton = \&AnyEvent::Socket::inet_aton; |
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goto &inet_aton |
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} |
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|
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=item fh_nonblocking $fh, $nonblocking |
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|
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Sets the blocking state of the given filehandle (true == nonblocking, |
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false == blocking). Uses fcntl on anything sensible and ioctl FIONBIO on |
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broken (i.e. windows) platforms. |
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|
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=cut |
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|
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sub fh_nonblocking($$) { |
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my ($fh, $nb) = @_; |
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|
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require Fcntl; |
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|
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if ($^O eq "MSWin32") { |
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$nb = (! ! $nb) + 0; |
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ioctl $fh, 0x8004667e, \$nb; # FIONBIO |
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} else { |
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fcntl $fh, &Fcntl::F_SETFL, $nb ? &Fcntl::O_NONBLOCK : 0; |
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} |
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} |
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|
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=item $guard = guard { CODE } |
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|
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This function creates a special object that, when called, will execute the |
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code block. |
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|
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This is often handy in continuation-passing style code to clean up some |
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resource regardless of where you break out of a process. |
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|
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You can call one method on the returned object: |
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|
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=item $guard->cancel |
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|
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This simply causes the code block not to be invoked: it "cancels" the |
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guard. |
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|
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=cut |
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|
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sub AnyEvent::Util::Guard::DESTROY { |
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${$_[0]}->(); |
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} |
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|
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sub AnyEvent::Util::Guard::cancel($) { |
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${$_[0]} = sub { }; |
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} |
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|
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sub guard(&) { |
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bless \(my $cb = shift), AnyEvent::Util::Guard:: |
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} |
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|
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1; |
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|
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=back |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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|
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=cut |
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|
