Concurrency is one of the most important concepts which can lead to errors in a system that are hard to find. With the inherent support for SMP and preemptive scheduling in Linux, concurrency is a critical factor which has to be considered while designing kernel modules or device drivers. Avoiding race conditions can be a difficult task. Linux, as in any other OS, provides many synchronization primitives to manage concurrency. Semaphores and Mutexes are part of them.Embedded Linux: Synchronization Primitives in Linux - Semaphores and Mutexes
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