Thread::Queue - thread-safe queues
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
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)
Thread::Queue
The new function creates a new empty queue.
new
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.
enqueue
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
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.
dequeue_nb
undef
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)
pending
Thread
To install lib, copy and paste the appropriate command in to your terminal.
cpanm
cpanm lib
CPAN shell
perl -MCPAN -e shell install lib
For more information on module installation, please visit the detailed CPAN module installation guide.