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Interlocked.CompareExchange Method (Int64%, Int64, Int64)

Compares two 64-bit signed integers for equality and, if they are equal, replaces one of the values.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.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.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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