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package CTK::Timeout; |
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1205
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use strict; |
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use utf8; |
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=encoding utf-8 |
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=head1 NAME |
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CTK::Timeout - Provides execute the code reference wrapped with timeout |
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=head1 VERSION |
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Version 1.00 |
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=head1 SYNOPSIS |
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use CTK::Timeout; |
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# Create the timeout object |
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my $to = CTK::Timeout->new(); |
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# Execute |
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unless ($to->timeout_call(sub { sleep 2 } => 1)) { |
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die $to->error if $to->error; |
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} |
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=head1 DESCRIPTION |
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This class provides execute the code reference wrapped with timeout |
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=head2 new |
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Creates the timeout object |
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my $to = CTK::Timeout->new(); |
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Creates the timeout object without the POSIX "sigaction" supporting (forced off) |
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my $to = CTK::Timeout->new(0); |
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=head2 error |
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die $to->error if $to->error; |
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Returns error string |
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=head2 timeout_call |
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Given a code reference (with optional arguments @args) will execute |
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as eval-wrapped with a timeout value (in seconds). This method returns |
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the return-value of the specified code in scalar context |
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my $retval = $to->timeout_call(sub { sleep 2 } => 1, "foo", "bar"); |
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=head1 HISTORY |
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See C file |
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=head1 DEPENDENCIES |
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L, L |
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=head1 TO DO |
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See C file |
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=head1 SEE ALSO |
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L, L |
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=head1 AUTHOR |
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Serż Minus (Sergey Lepenkov) L Eabalama@cpan.orgE |
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=head1 COPYRIGHT |
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Copyright (C) 1998-2022 D&D Corporation. All Rights Reserved |
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=head1 LICENSE |
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This program is free software; you can redistribute it and/or |
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modify it under the same terms as Perl itself. |
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See C file and L |
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=cut |
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use vars qw/$VERSION/; |
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$VERSION = "1.00"; |
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use Carp; |
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use POSIX ':signal_h'; |
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5264
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use Config; |
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# Check POSIX sigaction support |
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my $USE_POSIX_SIGACTION = 1; |
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$USE_POSIX_SIGACTION = 0 if $^O =~ /mswin/i or $^O =~ /cygwin/i; |
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$USE_POSIX_SIGACTION = 0 unless $Config{'useposix'} && $Config{'d_sigaction'}; |
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$USE_POSIX_SIGACTION = 0 if $Config{'archname'} && $Config{'archname'} =~ /^arm/; |
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sub new { |
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my $class = shift; |
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my $force = shift; |
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my $self = bless { |
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error => "", |
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use_sigaction => $USE_POSIX_SIGACTION ? $force // 1 : 0, |
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use_sigaction_origin => $USE_POSIX_SIGACTION, |
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}, $class; |
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return $self; |
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} |
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sub timeout_call { |
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my $self = shift; |
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my $code = shift // sub {1}; |
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my $timeout = shift || 0; |
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my @args = @_; |
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croak("The code reference incorrect") unless ref($code) eq 'CODE'; |
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$self->{error} = ""; |
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my $failed; |
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my $retval; # scalar context only! |
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# Without timeout |
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if (!$timeout) { |
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eval { |
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$retval = &$code(@args); |
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1; |
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} or do { |
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$self->{error} = $@ if $@; |
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}; |
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return $retval; |
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} |
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# With timeout |
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eval { # outer eval |
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my ($mask, $action, $oldaction); |
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my $use_sa = $self->{'use_sigaction'}; |
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my $h = sub { die "Call timed out\n" }; # N.B. \n required |
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local $SIG{ALRM} = $h unless $use_sa; # the handler code ref |
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if ($use_sa) { |
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$mask = POSIX::SigSet->new(SIGALRM); # list of signals to mask in the handler |
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$action = POSIX::SigAction->new($h, $mask); |
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$oldaction = POSIX::SigAction->new(); |
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sigaction(SIGALRM, $action, $oldaction); |
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} |
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eval { # inner eval |
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alarm($timeout); |
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$retval = &$code(@args); |
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alarm(0); |
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1; |
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} or $failed = 1; |
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alarm(0); # cancel alarm (if code ran fast) |
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sigaction(SIGALRM, $oldaction) if $use_sa; # restore original signal handler |
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die $@ if $failed && $@; # call died |
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1; |
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} or $failed = 1; |
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if ($failed) { |
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$self->{error} = $@ if $@; |
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} |
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return $retval; |
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} |
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sub error { |
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my $self = shift; |
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return $self->{error} // ""; |
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} |
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1; |