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Softrare Reliability Methods

Softrare Reliability Methods. Prof. Doron A. Peled Bar Ilan University, Israel And Univeristy of warwick, UK. Version 2008. Some related books:. Mainly:. Also:. Use software engineering methodologies to develop the code. Use formal methods during code development.

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CHAPTER 5 Concurrency ? Mutual Exclusion and Synchronization ? ????????? ?

CHAPTER 5 Concurrency ? Mutual Exclusion and Synchronization ? ????????? ?. Concurrency ?????. Communication among processes Sharing of and competing ( ?? )for resources Synchronization of the activities of multiple processes Allocation of processor time to processer. Concurrency.

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Chapter 6: Process Synchronization

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Solution to Race Condition: Mutual Exclusion and Synchronization

Solution to Race Condition: Mutual Exclusion and Synchronization. Problems with concurrent execution. Concurrent processes (or threads) often need to share data (maintained either in shared memory or files) and resources

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Chapter 6: Process Synchronization

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Chapter 5: Process Synchronization

Chapter 5: Process Synchronization. Processes can execute concurrently CPU scheduler switches rapidly between processes to provide concurrent execution A process m ay be interrupted at any time, partially completing execution

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Background

Background. Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes (i.e., processes share memory or use message passing to cooperate). Example:

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Background

Background. Concurrent access to shared data may result in data inconsistency Maintaining data consistency requires mechanisms to ensure the orderly execution of cooperating processes Recall Producer/Consumer problem in Chapter 4.

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Interprocess Communication (IPC)

Interprocess Communication (IPC). There are three issues to be considered how one process can pass information to another.

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W4118 Operating Systems

W4118 Operating Systems. Instructor: Junfeng Yang. Logistics. Homework 2 update Assembly code to call a hook function written in C syscall_fail(long syscall_nr) Clarifications on sys_fail (int ith, int ncall, struct syscall_failures calls) Only fail system calls from the current process

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Specification Formalisms

Specification Formalisms. Book: Chapter 5. Properties of formalisms. Formal. Unique interpretation. Intuitive. Simple to understand (visual). Succinct. Spec. of reasonable size. Effective. Check that there are no contradictions. Check that the spec. is implementable.

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Concurrent Processes

Concurrent Processes. x. P0. P1. 1. Wait until x has a value. 1. Wait until x is able to be set. 2. Use the value. 2. Produce a value. 3. Change the value to indicate used. 3. Set x to the value. Concurrency. Cooperating Processes.

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Parallel Programming 0024 Week 06

Parallel Programming 0024 Week 06. Thomas Gross Spring Semester 2010 Apr 15, 2010. Classroom exercise. Consider this program (fragment) [PingPong] for thread A (myid == 0) and thread B (myid == 1) // thread A public void run() { while (true) { A1: non_critical section

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Canadian Light Source Commissioning Progress

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Operating System Concepts and Techniques Lecture 12

Operating System Concepts and Techniques Lecture 12. Interprocess communication-1 M. Naghibzadeh Reference M. Naghibzadeh, Operating System Concepts and Techniques, First ed., iUniverse Inc., 2011. To order: www.iUniverse.com , www.barnesandnoble.com , or www.amazon.com.

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Horrific Specific Heat Problems

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While (lock = 1) wait Lock = 1 <critical section> Lock = 0

While (lock = 1) wait Lock = 1 <critical section> Lock = 0. While (lock = 1) wait Lock = 1 <critical section> Lock = 0. Loop1: While (turn != 1) wait <critical section> turn = 0 <noncritical section> GoToLoop1. Loop0: While (turn != 0) wait

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