Question: The procedure ContextSwitch is called whenever there is a switch in context from a running program A to another program B. The procedure is a

The procedure ContextSwitch is called whenever there is a switch in context from a running program A to another program B. The procedure is a straight-forward assembly language routine that saves and restores registers, and must be atomic (i.e., unbreakable). Something disastrous can happen if the routine ContextSwitch is not atomic.

(i) Explain why ContextSwitch must be atomic, possibly with an example. (ii) Explain how the atomicity can be achieved in practice (Hint: It has something to do with interrupts).

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Question # 3 I. What is the performance advantage in having device drivers and devices synchronize by means of device interrupts, rather than by polling (i.e., device driver keeps on polling the...

Task: Implement reliable transport protocol using Selective Repeat in C by studying and extending an implementation of Go Back N running on a network simulator. This practical requires thought and...

Provide a summary technical report with your own words about Pipelined Execution which is also named as Instruction Level Parallelism, addressing mainly the following areas: 1. What is Pipelined...

1. When you pass an array as an argument to a function, what is actually passed? a. the address of the array b. the values of the elements in the array c. a duplicate of the array d. the number of...

generally, please write three major parts: the cmake file, the assembler and the simulator. Please write in CPP language and male sure the whole program can run without bugs. thank you very much. 1....

) Explain the collision detection mechanism applied in standard wired medium access control associated with CSMA and indicate why this might be unsuitable for wireless networks. [2 marks] (ii)...

FUEL FOR THOUGHT: CLEAN GASOLINE AND DIRTY PATENTS SCOTT H. SEGAL INTRODUCTION One of the most successful air pollution control programs devised for use in the United States is the federal...

Files are not the only way to organize and store information. Databases are a common alternative. Question 3 options: True False Save Streams are sequences of bytes without separate metadata and...

s sf Define the terms opaque type and concrete type. [5 marks] The following is a shortened version of one of the definition modules described in the Modula-2 user manual: Provide a suitable...

What features or elements do you think are important in creating an effective chart? In order to write an effective chart some things to keep in mind is: Define a clear purpose. Know your audience....

Create a personal course reflection that will summarize what youve learned and how it will help you lead a healthier life. You may also compare and contrast your knowledge of Cardiovascular Disease...

Vernon Company currently produces and sells 7 , 5 0 0 units annually of a product that has a variable cost of $ 7 per unit and annual fixed costs of $ 3 2 5 , 5 0 0 . The company currently earns a $...

12. a. In hypoeutectoid steels Pearlite is on important microstructural appearance. What is Pearlite? Describe its microstructure and give the carbon concentration where 100% Pearlite grains can be...

Give an example of a Composite Primary Key use in a HCM Payroll Table.

How are Third Normal Form rules disregarded in Dimensional Database Design?

Provide examples of Dimensional Tables.