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Interlocked.Increment Method (Int64)

Increments a specified variable and stores the result, as an atomic operation.

Namespace:  System.Threading
Assemblies:   mscorlib (in mscorlib.dll)
  System.Threading (in System.Threading.dll)

'Declaration
Public Shared Function Increment ( _
	ByRef location As Long _
) As Long

Parameters

location
Type: System.Int64

The variable whose value is to be incremented.

Return Value

Type: System.Int64
The incremented value.

ExceptionCondition
NullReferenceException

The address of location is a null pointer.

This method handles an overflow condition by wrapping: if location = Int64.MaxValue, location + 1 = Int64.MinValue. No exception is thrown.

The Read method and the 64-bit overloads of the Increment, Decrement, and Add methods are truly atomic only on systems where a System.IntPtr is 64 bits long. On other systems, these methods are atomic with respect to each other, but not with respect to other means of accessing the data. Thus, to be thread safe on 32-bit systems, any access to a 64-bit value must be made through the members of the Interlocked class.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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