Interlocked.Add Method (Int64%, Int64)
Adds two 64-bit integers and replaces the first integer with the sum, as an atomic operation.
Assembly: mscorlib (in mscorlib.dll)
- Type: System.Int64%
A variable that contains the first value to be added. The sum of the two values is stored in location1.
- Type: System.Int64
The value to be added to the integer at location1.
Return ValueType: System.Int64
The new value stored at location1.
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 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.
Silverlight for Windows Phone64-bit members of the Interlocked class are present but not supported.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.