NAME Alien::Libjio - Installing and finding libjio (Journalled I/O library) VERSION Version 1.0 ($Id: ISAAC.pm 7057 2009-05-12 22:51:01Z FREQUENCY@cpan.org $) DESCRIPTION To ensure reliability, some file systems and databases provide support for something known as journalling. The idea is to ensure data consistency by creating a log of actions to be taken (called a Write Ahead Log) before committing them to disk. That way, if a transaction were to fail due to a system crash or other unexpected event, the write ahead log could be used to finish writing the data. While this functionality is often available with networked databases, it can be a rather memory- and processor-intensive solution, even where reliable writes are important. In other cases, the filesystem does not provide native journalling support, so other tricks may be used to ensure data integrity, such as writing to a separate temporary file and then overwriting the file instead of modifying it in-place. Unfortunately, this method cannot handle threaded operations appropriately. Thankfully, Alberto Bertogli published a userspace C library called libjio that can provide these features in a small (less than 1500 lines of code) library with no external dependencies. This package is designed to install it, and provide a way to get the flags necessary to compile programs using it. It is particularly useful for Perl XS programs that use it, such as IO::Journal. COMPATIBILITY This module was tested under Perl 5.10.0, using Debian Linux. However, because it's Pure Perl and doesn't do anything too obscure, it should be compatible with any version of Perl that supports its prerequisite modules. By default, this library is installed wherever the main system libraries are usually installed. As a result, "Alien::Libjio" will only work if installed with root permissions. If you encounter any problems on a different version or architecture, please contact the maintainer. AUTHOR Jonathan Yu CONTRIBUTORS Your name here ;-) ACKNOWLEDGEMENTS * Special thanks to Alberto Bertogli for developing this useful library and for releasing it into the public domain. SUPPORT You can find documentation for this module with the perldoc command. perldoc Alien::Libjio You can also look for information at: * AnnoCPAN: Annotated CPAN documentation * CPAN Ratings * Search CPAN * CPAN Request Tracker * CPAN Testing Service (Kwalitee Tests) * CPAN Testers Platform Compatibility Matrix REPOSITORY You can access the most recent development version of this module at: If you are a CPAN developer and would like to make modifications to the code base, please contact Adam Kennedy , the repository administrator. I only ask that you contact me first to discuss the changes you wish to make to the distribution. FEEDBACK Please send relevant comments, rotten tomatoes and suggestions directly to the maintainer noted above. If you have a bug report or feature request, please file them on the CPAN Request Tracker at . If you are able to submit your bug report in the form of failing unit tests, you are strongly encouraged to do so. SEE ALSO IO::Journal, a Perl module that provides an interface to libjio. App::Info::Lib::Jio, a package that gets information about libjio. , Alberto Bertogli's page about libjio, which explains the purpose and featuers of libjio. CAVEATS KNOWN BUGS There are no known bugs as of this release. LIMITATIONS * This module can only search known/common paths for libjio installations. It does try to use pkg-config and ExtUtils::Liblist to find a libjio installation on your system, but it cannot predict where files might have been installed. As a result, this package might install a duplicate copy of libjio. LICENSE Copyleft 2009 by Jonathan Yu . All rights reversed. I, the copyright holder of this package, hereby release the entire contents therein into the public domain. This applies worldwide, to the extent that it is permissible by law. In case this is not legally possible, I grant any entity the right to use this work for any purpose, without any conditions, unless such conditions are required by law. The full details of this can be found in the LICENSE file included in this package. DISCLAIMER OF WARRANTY The software is provided "AS IS", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall the authors or copyright holders be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with the software or the use or other dealings in the software.