InterlockedDecrement

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.

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.

Requirements

Runs on Versions Defined in Include Link to
Windows CE OS 1.0 and later Winbase.h    

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

InterlockedExchange, InterlockedIncrement

 Last updated on Tuesday, July 13, 2004

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