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Interlocked::Add Method (Int64%, Int64)

Adds two 64-bit integers and replaces the first integer with the sum, as an atomic operation.

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

public:
static long long Add(
	long long% location1, 
	long long value
)

Parameters

location1
Type: System::Int64%

A variable containing the first value to be added. The sum of the two values is stored in location1.

value
Type: System::Int64

The value to be added to the integer at location1.

Return Value

Type: System::Int64
The new value stored at location1.

ExceptionCondition
NullReferenceException

The address of location1 is a null pointer.

This method handles an overflow condition by wrapping: if the value at location1 is Int64::MaxValue and value is 1, the result is Int64::MinValue; if value is 2, the result is (Int64::MinValue + 1); and so on. 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: 4.5.2, 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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