Read–modify–write

CPU instruction to simultaneously read and write a value in memory

In computer science, read–modify–write is a class of atomic operations that both read a memory location and write a new value into it simultaneously, either with a completely new value or some function of the previous value. These operations prevent race conditions in multi-threaded applications. Typically they are used to implement mutexes or semaphores. These atomic operations are also heavily used in non-blocking synchronization.

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