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

Explain enhanced second-chance algorithm, Enhanced second-chance algorithm....

Enhanced second-chance algorithm. When we increase the second-chance algorithm by considering both the reference bit and the modify bit as an order pair. We have the following

Question, A paper mill produces two grades of paper viz., X and Y. Because ...

A paper mill produces two grades of paper viz., X and Y. Because of raw material restrictions, it cannot produce more than 400 tons of grade X paper and 300 tons of grade Y paper i

Explain multi-user based operating system, Multi-user - A multi-user Opera...

Multi-user - A multi-user Operating System permits for multiple users to use the same computer at the same time and/or different times. Below are some instances of multi-user Op

LINUX, what is exit status

what is exit status

Prepare gantt charts and determine the average waiting time, Prepare Gantt ...

Prepare Gantt Charts and Determine the Average Waiting Time 1. Classify the interaction among the processes on the basis if degree to which they are aware of each  other's exi

Thread pools, Another solution then would be to keep a pool of threads. Whe...

Another solution then would be to keep a pool of threads. Whenever a new task arrives, the system would simply get a thread from pool and set that thread to work on the given task.

Beladys anomaly algorithm, Q.  You have devised a fresh page-replacement a...

Q.  You have devised a fresh page-replacement algorithm that you think may be optimal. In a few contorted test cases Belady's anomaly occurs. Is the fresh algorithm optimal? Descr

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