The Apache Portable Runtime (APR) is a supporting library for the Apacheweb server. It provides a set of APIs that map to the underlying operating system (OS).[2] Where the OS does not support a particular function, APR will provide an emulation. Thus programmers can use the APR to make a program truly portable across platforms.
APR originally formed a part of Apache HTTP Server, but the Apache Software Foundation spun it off into a separate project. Other applications can use it to achieve platform independence.
Functionality
The range of platform-independent functionality provided by APR includes: [3]
GLib – provides similar functionality. It supports many more data structures and OS-independent functions, but fewer IPC-related functions. (GLib lacks local and global locking and shared-memory management.)
Adaptive Communication Environment (ACE) is an object-oriented library written in C++ similar in functionality to APR. It is widely deployed in commercial products.[4]
commonc++ is a cross-platform C++ class library for systems programming, with much of the same functionality as APR.
POCO is a modern C++ framework similar in concept but more extensive than APR.
WxWidgets is an object-oriented cross-platform GUI library that also provides abstraction classes for database communication, IPC and networking functionality.
^Stable Apache Release Hits, Sean Michael Kerner, 2 December 2005, "Apache Portable Runtime (APR) 1.0 API, which provides libraries that interface between the underlying operating system and the server."
