Data structure (and cross-platform implementation in C) for multi-threading application?

A producer-consumer FOFO blocking queue would seem reasonable. ALl multithreaded OS have suitable semaphores/mutexes/condvars/whatever to make the P-C queue and that you can define in one OS-specific interface unit.

Sure, a blocking queue is perfect for producer-consumer patterns. If you want something portable try Intel TBB and specifically tbb::concurrent_bounded_queue.

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