Identify the critical races, computer science, Basic Computer Science

1. The standard way for debuggers to plant breakpoints in a program in RAM (whatever the processor instruction set) is to save the breakpointed instruction and replace it by a jump to the breakpoint handling code. After the breakpoint is triggered, the saved instruction is restored in its original place. If the interactive dialogue with the debugger during the breakpoint indicates that that the triggered breakpoint is to be removed, execution of the program can be resumed simply by jumping to the instruction that had been breakponted. However, if the dialogue with the debugger indicates that the breakpoint is to remain in place when execution of the program is resumed, implementation is more complicated. Execution of the saved instruction could be emulated, but this is difficult to do, ensuring all side effects such as condition code setting and exception triggering are performed correctly, as well as following all addressing modes, such as PC relative. It is much easier simply to execute the breakpointed instruction in place, but to plant another breakpoint on a subsequent instruction in the same basic block, usually the immediate successor to the original breakpoint, so that the breakpoint handler can regain control in order to replant the original breakpoint and remove the secondary one. This obviously has some challenges if the successor of the breakpointed instruction cannot be statically predicted, for instance if the breakpointed instruction is a conditional jump, but a common solution is simply to ban breakpointing such instructions.
Identify the critical races that exist with this scheme if the program is executed by multiple threads, possibly multiple cores or multiple processors. Use pseudo-code to illustrate how you would resolve these issues.
Posted Date: 2/5/2012 12:47:58 PM | Location : United States







Related Discussions:- Identify the critical races, computer science, Assignment Help, Ask Question on Identify the critical races, computer science, Get Answer, Expert's Help, Identify the critical races, computer science Discussions

Write discussion on Identify the critical races, computer science
Your posts are moderated
Related Questions
Problem a. Compare between file processing system and DBMS >>This is a comparison of DBMS with file processing system which the answer has to be searched from the GOOGLE an

Regardless of of the fact that a thread must execute in process, the process and its associated threads are different notion. Processes are used to group resources together and thr

Communications Programs : By communications programs, we mean those programs which allow a computer to communicate via a transmission cable to another electronic device. Here we d

Ask question describes deadlock avoidance#Minimum 100 words accepted#

You are an engineer involved in the development of a financial system. During installation, you discover that this system will make a significant number of people redundant. The pe

DATA OUTPUT : Whatever, data or information that you feed into a computer will be the data output from a computer system and will be a data file sent from the computer to a periph


Hill Climbing - artificial intelligence: As we've seen, in some particular problems, searching the search path from primly to goal state is the point of the exercise. In anothe

Question 1 What are the five subscriber-related signaling functions performed by the operator? Question 2 Compare Microprogrammed control and Hard-wired control Que

Question 1 Explain the different categories of Software applications Question 2 Write a note on Data Dictionaries Question 3 Explain the following (a) Top-down testin