libiomux

iomux - High-performance aynchronous I/O multiplexing and timers

C library initially inspired to the perl module IO::Multiplex ( https://metacpan.org/pod/IO::Multiplex ) This library allows to efficiently handle i/o from/to multiple filedescriptors and timers. It supports different backends which can be chosen at compile time. The default is select() but support for epoll() and kqueue() is available (by defining HAVE_EPOLL or HAVE_QUEUE respectively at compile time).

A single mux is able to handle efficiently tens of thousands of active filedescriptors, and multiple muxes can be used seemlessy by different threads.

Timers are implemented using a priority queue to ensure O(1) extraction of the earliest timer. Insertion and deletion are still O(logN) operations and should be performed wisely when using a huge amount of timers.

Timeout on filedescriptors are not going into the priority queue but are handled together with the i/o so (re/un)setting a timeout on a managed filedescriptor is a very cheap operation.