This function both decrements (decreases by one) the value of the specified 32-bit variable and checks the resulting value. InterlockedDecrement prevents more than one thread from using the InterlockedDecrement or InterlockedIncrement function to access the same variable simultaneously.
At a Glance
| Header file: | Winbase.h |
| Windows CE versions: | 1.0 and later |
Syntax
LONG InterlockedDecrement( LPLONG lpAddend );
Parameters
lpAddend
[in] Pointer to the 32-bit variable to decrement.
Return Values
The return value is the resulting decremented value.
Remarks
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.
See Also