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Thursday, September 13, 2012

Managed code ,unmanaged code and jitter in .NET


.NET supports two kind of coding

Managed Code
Unmanaged Code

Managed Code


The resource, which is with in your application domain is, managed code. The resources that are within domain are faster.

The code, which is developed in .NET framework, is known as managed code. This code is directly executed by CLR with help of managed code execution. Any language that is written in .NET Framework is managed code.

Managed code uses CLR which in turns looks after your applications by managing memory, handling security, allowing cross - language debugging, and so on.



Unmanaged Code

The code, which is developed outside .NET, Framework is known as unmanaged code.

Applications that do not run under the control of the CLR are said to be unmanaged, and certain languages such as C++ can be used to write such applications, which, for example, access low - level functions of the operating system. Background compatibility with code of VB, ASP and COM are examples of unmanaged code.

Unmanaged code can be unmanaged source code and unmanaged compile code.

Unmanaged code is executed with help of wrapper classes.

Wrapper classes are of two types: CCW (COM Callable Wrapper) and RCW (Runtime Callable Wrapper).

Wrapper is used to cover difference with the help of CCW and RCW.

jitter

The entity that compiles CIL code into meaningful CPU instructions is termed a just-in-time (JIT) compiler, which sometimes referred as Jitter.
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