The InterlockedDecrement function both decrements (decreases by one) the value of the specified 32-bit variable and checks the resulting value. The function prevents more than one thread from using the same variable simultaneously.
// address of the variable to decrement
The return value is the resulting decremented value.
The functions InterlockedDecrement, InterlockedCompareExchange, InterlockedExchange, InterlockedExchangeAdd, and InterlockedIncrement provide a simple mechanism for synchronizing access to a variable that is shared by multiple threads. The threads of different processes can use this mechanism if the variable is in shared memory.
The variable pointed to by the lpAddend parameter must be aligned on a 32-bit boundary; otherwise, this function will fail on multiprocessor x86 systems.
InterlockedCompareExchange, InterlockedExchange, InterlockedExchangeAdd, InterlockedIncrement
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