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ZeroMQ "(also known as ØMQ, 0MQ, or zmq) looks like an embeddable networking library but acts like a concurrency framework. It gives you sockets that carry atomic messages across various transports like in-process, inter-process, TCP, and multicast. You can connect sockets N-to-N with patterns like fan-out, pub-sub, task distribution, and request-reply. It's fast enough to be the fabric for clustered products. Its asynchronous I/O model gives you scalable multicore applications, built as asynchronous message-processing tasks. It has a score of language APIs and runs on most operating systems."

ZeroMQ supports messaging patterns such as broker-less and brokered request-response (REQ-REP), broker-less and brokered publish-subscribe (PUB-SUB), and parallel pipelining (PUSH-PULL).


zeromq-fpc is a ZeroMQ binding for Free Pascal.