Advanced synchronization in operating system, Operating System

Assignment Help:

Recall that condition variables are synchronization primitives that enable threads to wait until a particular condition occurs.

Generalizing, the combination of locks and condition variables is sometimes called a monitor, which is sometimes incorporated into data structures in some languages (note that this termi- nology is not always used in a standardized way).

Previously,we discussed howto use condition variables and signals to implement a simple producer- consumer system. Looking at this system again, could we move the signal() call in enqueue() down below the unlock()?

dequeue()
lock(A)
while (queue empty)
wait(A, C)
remove_item()
unlock(A)
enqueue()
lock(A)
insert_item()
// used to signal here, inside lock
unlock(A)
signal(C) // now signal here, outside lock

Will this work? The answer is yes. It might not be as clean conceptually, but nothing bad will happen (verify this for yourself).


Related Discussions:- Advanced synchronization in operating system

List disadvantages of using a single directory, List disadvantages of using...

List disadvantages of using a single directory. Users have no privacy. Users must be careful in choosing file names, to avoid names used by others. Users may destroy each othe

Explain independent process and a cooperating process, Question: a) Ea...

Question: a) Each process is represented in the operating system by a process control block (PCB). The PCB contains many pieces of information associated with a specific proce

Explai basic concepts of demand paging, Basic concepts When a process i...

Basic concepts When a process is to be changed in, the pager guesses which pages will be used before the process is changed out again. Instead of swapping in a entire process,

What is single-level directory, What is Single-level Directory All file...

What is Single-level Directory All files are constrained in the similar directory, which is simple to support and understood. One limitation is when the number of files enhance

Read-write locks, Consider a large web-based database. In some sense, Googl...

Consider a large web-based database. In some sense, Google is sort of like this. There might be many users who want to read from the database, but only a few users who are allowed

What is cold backup, Cold Backup: It is copying the three groups of files...

Cold Backup: It is copying the three groups of files when the object is shut down. This is a straight file copy, generally from the storage disk directly to tape. You must end th

Determine the value to be loaded in relocation register, Refer a program wi...

Refer a program with a linked origin of 5000. Suppose the memory area allocated to it have the start address of 70000. Determine the value to be loaded in relocation register?

Write a short note on file organization and access, Write a short note on f...

Write a short note on file organization and access. There are three methods to access files 1Record Access 2Sequential Access 3Random Access The record access

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