Explain two-phase locking protocol, Operating System

Assignment Help:

Q. Show that a few schedules are possible under the two-phase locking protocol however not possible under the timestamp protocol and vice versa.

Answer: A schedule that is authorized in the two-phase locking protocol but not in the timestamp protocol is:

1660_Explain Two-phase locking protocol.png

This schedule isn't allowed in the timestamp protocol because at step 7 the W-timestamp of B is 1.

A schedule that is permitted in the timestamp protocol but not in the two-phase locking protocol is:

2316_Explain Two-phase locking protocol1.png

This schedule can't have lock instructions added to formulate it legal under two-phase locking protocol because T1 must unlock (A) between steps 2 and 3 and must lock (B) between steps 4 and 5.


Related Discussions:- Explain two-phase locking protocol

Explain fixed partitioning, Explain fixed partitioning. Partitioning ar...

Explain fixed partitioning. Partitioning are the simpler techniques that don't involve virtual memory. Partitioning has been used in numerous variations in operating systems.

Assignment, Ask question #Minimum 100 words accDefine Hashing System. Descr...

Ask question #Minimum 100 words accDefine Hashing System. Describe the Hashed page table with example and mapping figure.

Memory management, what is hashed page tables & explain of there work & fig...

what is hashed page tables & explain of there work & figure

What is external fragmentation?, What is external fragmentation? As pro...

What is external fragmentation? As process are removed from and loaded to the memory free memory space is bracken into pieces .external fragmentation take place when enough mem

General graph directory system in shell sort, we need an information about ...

we need an information about the different graph directory systems in detail by using shell sort . we also application part of directory systems in practical life. please help us i

Clocks in distributed systems, Clocks in distributed systems : a. Why ar...

Clocks in distributed systems : a. Why are clocks difficult to synchronize in distributed systems? b. What features in a system assume that the clocks are (reasonably) synchr

Define different multithreading models, DIFFERENT MULTITHREADING MODELS ...

DIFFERENT MULTITHREADING MODELS Multithreading Models the majority multithreading models fall into one of the following categories of threading implementation: 1.      M

Explain tightly coupled systems and loosely coupled system, Differentiate t...

Differentiate tightly coupled systems and loosely coupled systems? Loosely coupled systems:-  Every processor has its own local memory  Every processor can communicate

Unix, UNIX Shell and History feature. 1.Creating a child process. 2.Creatin...

UNIX Shell and History feature. 1.Creating a child process. 2.Creating a history feature. With the notes under code. Its exactly "programming project 1 - Unix Shell and History Fea

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd