The libevent API provides a mechanism to execute a callback function when a specific event occurs on a file descriptor or after a timeout has been reached. It is meant to replace the asynchronous event loop found in event-driven network servers.

libevent - an event notification library 

mTCP is a high-performance user-level TCP stack for multicore systems. Scaling the performance of short TCP connections is fundamentally challenging due to inefficiencies in the kernel. mTCP addresses these inefficiencies from the ground up - from packet I/O and TCP connection management all the way to the application interface. It translates expensive system calls to shared memory access between two threads within the same CPU core.

mTCP - A Highly Scalable User-level TCP Stack for Multicore Systems

Lighttpd powers several popular Web 2.0 sites like YouTube, wikipedia and meebo. Its high speed io-infrastructure allows them to scale several times better with the same hardware than with alternative web-servers. Its features include small memory footprint, FastCGI, Output-Compression, URL-Rewriting and lot more. Its event-driven architecture is optimized for a large number of parallel connections (keep-alive) which is important for high performance AJAX applications.

Lighttpd - Webserver optimized for speed

Libev is a high-performance event loop, supporting eight event types (I/O, real time timers, wall clock timers, signals, child status changes, idle, check and prepare handlers). It uses a priority queue to manage timers and uses arrays as fundamental data structure. It has no artificial limitations on the number of watchers waiting for the same event. 

Libev - High performance full-featured event loop written in C

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libevent - an event notification library

mTCP - A Highly Scalable User-level TCP Stack for Multicore Systems

Lighttpd - Webserver optimized for speed

Libev - High performance full-featured event loop written in C

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libevent - an event notification library

mTCP - A Highly Scalable User-level TCP Stack for Multicore Systems

Lighttpd - Webserver optimized for speed

Libev - High performance full-featured event loop written in C

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