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You can use a mutex object to protect a shared resource from simultaneous access by multiple threads or processes. The state of a mutex object is either set to signaled, when it is not owned by any thread, or nonsignaled, when it is owned. Only one thread at a time can own a mutex object. For example, to prevent two threads from writing to shared memory at the same time, each thread waits for ownership of a mutex object before executing the code that accesses the memory. netherlands business email database