ActiveState!

ActivePerl Documentation
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(Usage Statistics)
(about this ver)


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 Thread::Queue - thread-safe queues


NAME

Thread::Queue - thread-safe queues


SUPPORTED PLATFORMS

  • Linux
  • Solaris
  • Windows

SYNOPSIS

    use Thread::Queue;
    my $q = new Thread::Queue;
    $q->enqueue("foo", "bar");
    my $foo = $q->dequeue;    # The "bar" is still in the queue.
    my $foo = $q->dequeue_nb; # returns "bar", or undef if the queue was
                              # empty
    my $left = $q->pending;   # returns the number of items still in the queue


DESCRIPTION

A queue, as implemented by Thread::Queue is a thread-safe data structure much like a list. Any number of threads can safely add elements to the end of the list, or remove elements from the head of the list. (Queues don't permit adding or removing elements from the middle of the list)


FUNCTIONS AND METHODS

new
The new function creates a new empty queue.

enqueue LIST
The enqueue method adds a list of scalars on to the end of the queue. The queue will grow as needed to accomodate the list.

dequeue
The dequeue method removes a scalar from the head of the queue and returns it. If the queue is currently empty, dequeue will block the thread until another thread enqueues a scalar.

dequeue_nb
The dequeue_nb method, like the dequeue method, removes a scalar from the head of the queue and returns it. Unlike dequeue, though, dequeue_nb won't block if the queue is empty, instead returning undef.

pending
The pending method returns the number of items still in the queue. (If there can be multiple readers on the queue it's best to lock the queue before checking to make sure that it stays in a consistent state)


SEE ALSO

the Thread manpage


=cut

sub new { my $class = shift; return bless [@_], $class; }

sub dequeue : locked : method { my $q = shift; cond_wait $q until @$q; return shift @$q; }

sub dequeue_nb : locked : method { my $q = shift; if (@$q) { return shift @$q; } else { return undef; } }

sub enqueue : locked : method { my $q = shift; push(@$q, @_) and cond_broadcast $q; }

sub pending : locked : method { my $q = shift; return scalar(@$q); }

1;

 Thread::Queue - thread-safe queues