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Decrement Method (Int64)
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Interlocked.Decrement Method (Int64)

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

Namespace:  System.Threading
Assemblies:   mscorlib (in mscorlib.dll)
  System.Threading (in System.Threading.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: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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