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Full Discussion: Stream Read And Write Queues
Top Forums UNIX for Advanced & Expert Users Stream Read And Write Queues Post 21789 by killerserv on Wednesday 22nd of May 2002 10:03:49 PM
Old 05-22-2002
Data on a Stream is passed in the form of messages. Each Stream head, STREAMS module, and driver has a read side and a write side. When messages go from one module's read side to the next module's read side they are said to be traveling upstream. Messages passing from one module's write side to the next module's write side are said to be traveling downstream.

Each Stream head, driver, and module has its own pair of queues, one queue for the read side and one queue for the write side. Messages are ordered into queues, generally on a first-in, first-out basis (FIFO), according to priorities associated with them.

The queue's service procedure deals with messages on the queue, usually by removing successive messages from the queue, processing them, and calling the put procedure of the next module in the Stream to pass the message to the next queue!
 

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LEARN ABOUT DEBIAN

data::stream::bulk::path::class

Data::Stream::Bulk::Path::Class(3pm)			User Contributed Perl Documentation		      Data::Stream::Bulk::Path::Class(3pm)

NAME

       Data::Stream::Bulk::Path::Class - Path::Class::Dir traversal

VERSION

       version 0.11

SYNOPSIS

	       use Data::Stream::Bulk::Path::Class;

	       my $dir = Data::Stream::Bulk::Path::Class->new(
		       dir => Path::Class::Dir->new( ... ),
	       );

DESCRIPTION

       This stream produces depth or breadth first traversal order recursion through Path::Class::Dir objects.

       Items are read iteratively, and a stack of open directory handles is used to keep track of state.

ATTRIBUTES

       chunk_size
	   Defaults to 250.

       depth_first
	   Chooses between depth first and breadth first traversal order.

       only_files
	   If true only Path::Class::File items will be returned in the output streams (no directories).

METHODS

       is_done
	   Returns true when no more files are left to iterate.

       next
	   Returns the next chunk of Path::Class objects

AUTHOR

       Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Yuval Kogman.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-02-14				      Data::Stream::Bulk::Path::Class(3pm)
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