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Interlocked.Decrement Method (Int64)

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

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)
public static long Decrement(
	ref long location
)

Parameters

location
Type: System.Int64

The variable whose value is to be decremented.

Return Value

Type: System.Int64
The decremented value.
ExceptionCondition
ArgumentNullException

The address of location is a null pointer.

This method handles an overflow condition by wrapping: if location = Int64.MinValue, location - 1 = Int64.MaxValue. 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: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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