Libev - High performance full-featured event loop written in C
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.
http://software.schmorp.de/pkg/libev.html
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