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I’m looking for a way to get two programs to efficiently transmit a large amount of data to each other, which needs to work on Linux and Windows, in C++. The context here is a P2P network program that acts as a node on the network and runs continuously, and other applications (which could be games hence the need for a fast solution) will use this to communicate with other nodes in the network. If there’s a better solution for this I would be interested.
boost::asio is a cross platform library handling asynchronous io over sockets. You can combine this with using for instance Google Protocol Buffers for your actual messages.
Boost also provides you with boost::interprocess for interprocess communication on the same machine, but asio lets you do your communication asynchronously and you can easily have the same handlers for both local and remote connections.