InterlockedIncrement
The InterlockedIncrement
function both increments (increases 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.
LONG InterlockedIncrement(
|
LPLONG lpAddend |
// address of the
variable to increment |
|
); |
|
Parameters
lpAddend
Points to the
32-bit variable to increment.
Return Values
If the result
of the increment is zero, the return value is zero.
If the result
of the increment is less than zero, the return value is less than zero. If the
result of the increment is greater than zero, the return value is greater than
zero. A nonzero return value may not be equal to the result of the increment.
Remarks
The functions
InterlockedIncrement, InterlockedCompareExchange, InterlockedDecrement, InterlockedExchange,
and InterlockedExchangeAdd 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.
See Also