Libev is a high-performance event loop featuring support for I/O, timers (relative and absolute, cron-like ones), signals, process status changes, and other types of events. It has both a fast native API and libevent emulation to support programs written using the libevent API. The libev distribution consists of libevent with the core event handling parts replaced by the libev embedded event loop. Differences to libevent include higher speed, simpler design, more features, less memory usage, and no arbitrary limits. libev supports epoll, kqueue, Solaris ports, poll, and select.

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