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Context (computing)
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Context (computing) : ウィキペディア英語版
Context (computing)

In computer science, a task context is the minimal set of data used by a task (which may be a process or thread) that must be saved to allow a task interruption at a given date, and a continuation of this task at the point it has been interrupted and at an arbitrary future date. The concept of context assumes significance in the case of interruptible tasks, wherein upon being interrupted the processor saves the context and proceeds to serve the Interrupt service routine. Thus, the smaller the context is, the smaller the latency is.
The context data may be located in processor registers, memory used by the task, or in control registers used by some operating systems to manage the task.
The storage memory (files used by a task) is not concerned by the "task context" in the case of a context switch, even if this can be stored for some uses (checkpointing).
==Context types==
In some computer languages like C#, there is also the concept of ''safe''/''secure context''. For instance, if an array is needed inside a structure, it can be added to it since version 2.0, but only in an unsafe/unsecure context.〔(Structures in C# 2.0 )〕 Here is an example code:

struct ParameterRepresentation
;

The (fixed ) keyword prevents the garbage collector from relocating this variable. The access to an array is like in C++, i.e. using pointer arithmetic, where individual elements of the array can be accessed over its indexes.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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