- The readers-writers problem is used to manage synchronization so that there are no problems with the object data. For example – If two readers access the object at the same time there is no problem. However if two writers or a reader and writer access the object at the same time, there may be problems.
Is reader/writer a problem?
The readers-writers problem relates to an object such as a file that is shared between multiple processes. The readers-writers problem is used to manage synchronization so that there are no problems with the object data. For example – If two readers access the object at the same time there is no problem.
What is Reader writer problem in Blockchain?
The readers-writers problem is a classical problem of process synchronization, it relates to a data set such as a file that is shared between more than one process at a time. Let’s understand with an example – If two or more than two readers want to access the file at the same point in time there will be no problem.
What is the second readers-writers problem?
The second readers-writers problem requires that, once a writer is ready, that writer performs its write as soon as possible. In other words, if a writer is waiting to access the shared data, no new readers may start reading.
How many can access the lock for writing and reading in Reader writer problem?
The Problem Statement There are two types of processes in this context. They are reader and writer. Any number of readers can read from the shared resource simultaneously, but only one writer can write to the shared resource. When a writer is writing data to the resource, no other process can access the resource.
How can starvation occur in the readers and writers problem?
Once the first reader is in the entry section, it will lock the resource. This means that a stream of readers can subsequently lock all potential writers out and starve them. This is so, because after the first reader locks the resource, no writer can lock it, before it gets released.
How the problem can be solved using semaphores?
We can solve this problem by using semaphores. A semaphore S is an integer variable that can be accessed only through two standard operations: wait() and signal(). The wait() operation reduces the value of semaphore by 1 and the signal() operation increases its value by 1.
Which is true about reader/writer lock?
In computer science, a readers–writer (single-writer lock, a multi-reader lock, a push lock, or an MRSW lock) is a synchronization primitive that solves one of the readers–writers problems. An RW lock allows concurrent access for read-only operations, while write operations require exclusive access.
What’s wrong with Blockchain?
The current architecture of the blockchain is high on energy consumption, and also has problems with scaling. The root problem is that all transactions in the blockchain have to be processed by basically everyone and everyone must have a copy of the global ledger.
Do writers starve?
Give up the myth of the starving writer. Click here to download your free copy of The Writer’s Roadmap. A friend of mine recently did a survey of a few thousand writers, asking them how much money they make off their writing per month.
How many writers may concurrently share the database with the readers-Writers problem?
readers-writers problem? Only one writer may have access to the database at a time.
How can hypertext help both readers and writers?
Hypertext is simply a non-linear way of presenting information. These links are provided so that readers may ” jump ” to further information about a specific topic being discussed (which may have more links, leading each reader off into a different direction).
Which of the following requires that once a writer is ready that writer performs its write as soon as possible?
The first readers-writers problem requires that no reader will be kept waiting unless a writer has already obtained permission to use the shared database; whereas the second readers-writers problem requires that once a writer is ready, that writer performs its write as soon as possible.
What are monitors in OS?
In other words, monitors are defined as the construct of programming language, which helps in controlling shared data access. The Monitor is a module or package which encapsulates shared data structure, procedures, and the synchronization between the concurrent procedure invocations.
What is mutual exclusion in OS with example?
Many forms of mutual exclusion have side-effects. For example, classic semaphores permit deadlocks, in which one process gets a semaphore, another process gets a second semaphore, and then both wait till the other semaphore to be released. Blocking system calls used to sleep an entire process.
What is a mutex in OS?
Strictly speaking, a mutex is a locking mechanism used to synchronize access to a resource. Only one task (can be a thread or process based on OS abstraction) can acquire the mutex. It means there is ownership associated with a mutex, and only the owner can release the lock (mutex).