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.
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Several new APIs have been introduced (event_base_new, event_reinit, event_loopbreak, etc.). RPC structures can now use 32-bit structure identifiers. The performance of the Windows backend has been improved. There are additional bug and correctness fixes.
