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Apache Portable Runtime Library (APR)
-------------------------------------
The Apache Portable Runtime Library provides a predictable and
consistent interface to underlying platform-specific
implementations, with an API to which software developers may code
and be assured of predictable if not identical behavior regardless
of the platform on which their software is built, relieving them of
the need to code special-case conditions to work around or take
advantage of platform-specific deficiencies or features.
APR and its companion libraries are implemented entirely in C
and provide a common programming interface across a wide variety
of operating system platforms without sacrificing performance.
Currently supported platforms include:
UNIX variants
Windows
Netware
Mac OS X
OS/2
To give a brief overview, the primary core
subsystems of APR 1.3 include the following:
Atomic operations
Dynamic Shared Object loading
File I/O
Locks (mutexes, condition variables, etc)
Memory management (high performance allocators)
Memory-mapped files
Multicast Sockets
Network I/O
Shared memory
Thread and Process management
Various data structures (tables, hashes, priority queues, etc)
For a more complete list, please refer to the following URLs:
http://apr.apache.org/docs/apr/modules.html
Users of APR 0.9 should be aware that migrating to the APR 1.x
programming interfaces may require some adjustments; APR 1.x is
neither source nor binary compatible with earlier APR 0.9 releases.
Users of APR 1.x can expect consistent interfaces and binary backwards
compatibility throughout the entire APR 1.x release cycle, as defined
in our versioning rules:
http://apr.apache.org/versioning.html
APR is already used extensively by the Apache HTTP Server
version 2 and the Subversion revision control system, to
name but a few. We list all known projects using APR at
http://apr.apache.org/projects.html -- so please let us know
if you find our libraries useful in your own projects!
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