Native library for Tomcat to use the Apache Portable Runtime to
provide superior scalability, performance, and better integration with
native server technologies. The Apache Portable Runtime is a highly
portable library that is at the heart of Apache HTTP Server 2.x. APR
has many uses, including access to advanced IO functionality (such as
sendfile, epoll and OpenSSL), OS level functionality (random number
generation, system status, etc), and native process handling (shared
memory, NT pipes and Unix sockets).