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Tham khảo tài liệu 'practical mod_perl-chapter 24:mod_perl 2.0: installation and configuration', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ch24.25990 Page 685 Thursday November 18 2004 12 47 PM CHAPTER 24 mod_perl 2.0 Installation and Configuration Since Doug MacEachern introduced mod_perl 1.0 in 1996 he has had to tweak it with every change in Apache and Perl while maintaining compatibility with the older versions. These rewrites have led to very complex source code with hundreds of ifdefs and workarounds for various incompatibilities in older Perl and Apache versions. Apache 2.0 however is based on a new threads design requiring that mod_perl be based on a thread-safe Perl interpreter. Perl 5.6.0 was the first Perl version to support internal thread-safety across multiple interpreters. Since Perl 5.6.0 and Apache 2.0 are the very minimum requirements for the newest version of mod_perl backward compatibility was no longer a concern so this seemed like a good time to start from scratch. mod_perl 2.0 was the result a leaner more efficient mod_perl that s streamlined for Apache 2.0. mod_perl 2.0 includes a mechanism for building the Perl interface to the Apache API automatically allowing us to easily adjust mod_perl 2.0 to the ever-changing Apache 2.0 API during its development period. Another important feature is the Apache Test framework which was originally developed for mod_perl 2.0 but then was adopted by Apache 2.0 developers to test the core server features and third-party modules. Moreover the tests written using the Apache Test framework could be run with Apache 1.0 and 2.0 assuming that both supported the same features. Many other interesting changes have already happened to mod_perl in Version 2.0 and more will be developed in the future. Some of these will be covered in this chapter and some you will discover on your own while reading mod_perl documentation. At the time of this writing mod_perl 2.0 is considered beta when used with the prefork Multi-Processing Model module MPM and alpha when used with a threaded Here and in the rest of this and the next chapter we refer to the mod_perl 1.x
