Graham Barr > perl5.005_03 > Thread::Queue

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By perlmonks.org
Source   Latest Release: perl5.005_04

NAME ^

Thread::Queue - thread-safe queues

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 ^

Thread

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