Podcast
Questions and Answers
What is the concept of process synchronization?
What is the concept of process synchronization?
The concept of process synchronization is to ensure the orderly execution of cooperating processes to prevent data inconsistency.
What is the critical-section problem?
What is the critical-section problem?
The critical-section problem involves designing a protocol to ensure that when one process is in its critical section, no other process can enter its critical section.
Processes can execute concurrently without any risk of data inconsistency.
Processes can execute concurrently without any risk of data inconsistency.
False (B)
What happens if the producer tries to produce when the buffer is full?
What happens if the producer tries to produce when the buffer is full?
In the consumer-producer problem, what is the role of the integer counter?
In the consumer-producer problem, what is the role of the integer counter?
What is a race condition?
What is a race condition?
Which of the following are components of the solution to the critical-section problem? (Select all that apply)
Which of the following are components of the solution to the critical-section problem? (Select all that apply)
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Study Notes
Introduction
- Process synchronization is the coordination of processes that require access to shared data
- Critical-section problem: If multiple processes attempt to modify shared data at the same time, the data becomes inconsistent, impacting the accuracy, completeness and correctness.
- The critical-section problem aims to ensure that only one process accesses shared data at a time
Objectives
- Define Process Synchronization
- Explain the critical-section problem and its implications
- Explore software and hardware solutions to address the critical-section problem
- Analyze classical process synchronization problems
Background
- Concurrent processes can access shared data, causing inconsistency
- The critical section problem emerges when multiple processes concurrently access and manipulate shared data, leading to unpredictable and potentially incorrect results.
- Race condition: Processes accessing and manipulating shared data in an uncontrolled order leads to inconsistent results.
Critical Section Problem
- A system of n processes (p0, p1, … pn-1) access shared resources.
- Each process has a critical section: a segment of code that accesses and modifies shared data.
- To ensure data integrity, a protocol is required to ensure that only one process can execute its critical section at a time.
- The critical section problem involves designing a protocol that guarantees mutual exclusion within the critical section.
Critical Section
- Each process Pi has a generic structure:
- Entry Section: Where a process requests permission to enter its critical section.
- Critical Section: Where the process can execute operations on shared data.
- Exit Section: Where the process releases the critical section, allowing other processes to enter.
- Remainder Section: Where the process performs non-critical operations.
Solution to Critical-Section Problem
- The solution requires satisfying two requirements:
- Mutual Exclusion: Ensures that no other process can execute in its critical section while another process is in its critical section.
- Progress: Guarantees that if no process is in its critical section, and several process wish to enter, then only those not in their remainder sections can participate in the decision of who will enter their critical section next, and this decision cannot be postponed indefinitely.
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