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package IPC::Semaphore::Set::Resource; |
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use strict; |
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use warnings; |
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use 5.008; |
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use IPC::SysV qw(SEM_UNDO IPC_NOWAIT); |
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3697
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our $VERSION = 1.20; |
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############ |
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## Public ## |
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############ |
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sub new |
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{ |
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my $class = shift; |
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my $args = ref($_[0]) ? $_[0] : {@_}; |
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# check for required arguments. |
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die "'key' is required" unless defined($args->{key}); |
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die "'number' is required" unless defined($args->{number}); |
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die "'semaphore' is required" unless (ref($args->{semaphore}) eq 'IPC::Semaphore'); |
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# 'cleanup_object' determines whether or not we'll be cleaning up in DESTROY |
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if (!defined($args->{cleanup_object})) { |
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$args->{cleanup_object} = 1; |
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} |
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my $self = bless($args, $class); |
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# blow up if the system doesn't have this resource in the set |
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if (!defined($self->value)) { |
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my $total = () = $self->semaphore->getall; |
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die $self->{number} . ' is not a valid resource for semaphore [' . $self->{key} |
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. "] which only has [$total] total resources. The resources start at 0."; |
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} |
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return bless($args, $class); |
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} |
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sub lockOrDie { |
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my $self = shift; |
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100
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if ($self->_lock(IPC_NOWAIT)) { |
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return 1; |
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} else { |
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die "could not lock on semaphore [$self->{key}] resource number [$self->{number}]"; |
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} |
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} |
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sub lockWaitTimeout |
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{ |
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my $self = shift; |
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my $timeout = shift || 3; |
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my $lock; |
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eval { |
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local $SIG{ALRM} = sub { die "alarm\n" }; |
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alarm $timeout; |
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$lock = $self->_lock; |
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alarm 0; |
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}; |
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if (!$lock) { |
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0
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return 0; |
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} |
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1
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return 1; |
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} |
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sub lockWaitTimeoutDie |
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{ |
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my $self = shift; |
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1
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my $timeout = shift || 3; |
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1
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my $lock; |
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1
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eval { |
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1
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local $SIG{ALRM} = sub { die "alarm\n" }; |
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1000122
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alarm $timeout; |
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$lock = $self->_lock; |
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alarm 0; |
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}; |
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1
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if (!$lock) { |
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die "could not establish lock after $timeout seconds"; |
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} |
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0
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return 1; |
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} |
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sub lock {return shift->_lock(IPC_NOWAIT) ? 1 : 0} |
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sub lockWait {return shift->_lock ? 1 : 0} |
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sub addValue {return shift->_add_value(IPC_NOWAIT) ? 1 : 0} |
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############ |
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## Helper ## |
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############ |
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0
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sub number {return shift->{number}} |
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0
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sub semaphore {return shift->{semaphore}} |
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sub value { |
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0
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my $self = shift; |
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return $self->semaphore->getval($self->number); |
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} |
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############# |
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## Private ## |
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############# |
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sub _lock |
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{ |
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my ($self, $flags) = @_; |
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if ($self->semaphore->op($self->number, -1, $flags)) { |
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$self->{_locks}++; |
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return 1; |
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} |
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3
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return 0; |
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} |
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sub _add_value |
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{ |
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my ($self, $flags) = @_; |
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if ($self->semaphore->op($self->number, 1, $flags)) { |
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$self->{_locks}--; |
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5
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return 1; |
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} |
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0
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0
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return 0; |
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} |
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sub DESTROY |
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{ |
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my $self = shift; |
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8
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return unless $self->{cleanup_object}; |
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6
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100
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if (defined($self->{_locks})) { |
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1
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4
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if ($self->{_locks} > 0) { |
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0
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0
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while ($self->{_locks} > 0) { |
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0
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$self->semaphore->op($self->number, 1, IPC_NOWAIT); |
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0
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0
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$self->{_locks}--; |
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} |
129
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} |
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1
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50
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41
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if ($self->{_locks} < 0) { |
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0
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while ($self->{_locks} < 0) { |
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0
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$self->semaphore->op($self->number, -1, IPC_NOWAIT); |
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0
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$self->{_locks}++; |
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} |
135
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} |
136
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} |
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} |
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139
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1; |
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141
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__END__ |