Synchronization #84
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Synchronization #84
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In the current situation, only one thread runs at a time since only one CPU is enabled. Furthermore, threading is fully cooperative since interrupts are always disabled, so threads can never be preempted.
This PR starts laying the foundations for multiprocessing by creating the necessary synchronization primitives (spinlock, atomic increment/decrement, "block thread and unlock", etc.) and by ensuring they are used where needed.