mongoose/docs/design-concept/intro.md
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title
Design Concept

Mongoose is a multi-protocol networking library that implements non-blocking, asyncronous IO and provides event-based API. It has three basic data structures:

Connections could be either listening, outbound or inbound. Outbound connections are created by mg_connect() call. Listening connections are created by mg_bind() call. Inbound connections are those accepted by a listening connection. Each connection is described by struct mg_connection structure, which has a number of fields like socket, event handler function, send/receive buffer, flags, et cetera.

Mongoose usage pattern is to declare and initialize event manager, create connections and create an event loop by calling mg_mgr_poll() in a loop. mg_mgr_poll() iterates over all sockets, accepts new connections, sends and receives data, closes connections, and calls event handler functions for the respective events.