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Interlocked.CompareExchange Method (Int64, Int64, Int64)

Compares two 64-bit signed integers for equality and, if they are equal, replaces the first value.

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

public static long CompareExchange(
	ref long location1,
	long value,
	long comparand
)

Parameters

location1
Type: System.Int64

The destination, whose value is compared with comparand and possibly replaced.

value
Type: System.Int64

The value that replaces the destination value if the comparison results in equality.

comparand
Type: System.Int64

The value that is compared to the value at location1.

Return Value

Type: System.Int64
The original value in location1.

ExceptionCondition
NullReferenceException

The address of location1 is a null pointer.

If comparand and the value in location1 are equal, then value is stored in location1. Otherwise, no operation is performed. The compare and exchange operations are performed as an atomic operation. The return value of CompareExchange is the original value in location1, whether or not the exchange takes place.

.NET Framework

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

.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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