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Interlocked.CompareExchange Method (IntPtr, IntPtr, IntPtr)

Compares two platform-specific handles or pointers for equality and, if they are equal, replaces one of them.

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

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

Parameters

location1
Type: System.IntPtr

The destination IntPtr, whose value is compared with the value of comparand and possibly replaced by value.

value
Type: System.IntPtr

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

comparand
Type: System.IntPtr

The IntPtr that is compared to the value at location1.

Return Value

Type: System.IntPtr
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 this method is the original value in location1, whether or not the exchange takes place.

NoteNote

IntPtr is a platform-specific type.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.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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