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Queues are fundamental structures in technology, enabling efficient task management across various systems. From simple FIFO queues to complex priority-based implementations, understanding these structures is crucial for software developers and system architects.
1. Simple FIFO Queue
- Operates on a First-In-First-Out (FIFO) basis.
- Ideal for task scheduling, print spooling, and network packet handling.
You Should Know:
Python FIFO Queue Example
from queue import Queue
q = Queue()
q.put("Task1")
q.put("Task2")
print(q.get()) Output: Task1
Linux Command for Process Scheduling:
View running processes (FIFO-based scheduling) ps aux
2. Circular Queue
- Prevents memory wastage by reusing empty slots.
- Used in buffering, traffic systems, and CPU scheduling.
You Should Know:
Circular Queue Implementation
class CircularQueue:
def <strong>init</strong>(self, size):
self.queue = [bash] size
self.head = self.tail = -1
self.size = size
def enqueue(self, item):
if (self.tail + 1) % self.size == self.head:
print("Queue is full!")
else:
if self.head == -1:
self.head = 0
self.tail = (self.tail + 1) % self.size
self.queue[self.tail] = item
def dequeue(self):
if self.head == -1:
print("Queue is empty!")
else:
item = self.queue[self.head]
if self.head == self.tail:
self.head = self.tail = -1
else:
self.head = (self.head + 1) % self.size
return item
Linux Command for Circular Buffer Monitoring:
dmesg | tail -n 20 Check kernel ring buffer (circular log)
3. Priority Queue
- Higher-priority tasks execute first.
- Used in real-time systems, Dijkstra’s algorithm, and CPU scheduling.
You Should Know:
Python Priority Queue import heapq tasks = [] heapq.heappush(tasks, (3, "Low Priority")) heapq.heappush(tasks, (1, "High Priority")) print(heapq.heappop(tasks)) Output: (1, "High Priority")
Linux Command for Priority-Based Process Control:
nice -n -20 ./high_priority_script.sh Set highest priority renice 10 -p PID Adjust priority of a running process
4. Deque (Double-Ended Queue)
- Insert/remove from both ends.
- Used in undo operations, palindrome checks, and sliding window algorithms.
You Should Know:
Python Deque
from collections import deque
d = deque()
d.appendleft("Front")
d.append("End")
print(d.pop()) Output: "End"
Linux Command for Log Rotation (Deque-like Behavior):
logrotate -f /etc/logrotate.conf Manage log files efficiently
What Undercode Say
Queues are the backbone of system efficiency, from OS scheduling to network traffic management. Mastering them unlocks:
– Optimized resource handling
– Better performance in distributed systems
– Real-time processing capabilities
Advanced Linux Queue Monitoring:
View kernel message queue ipcs -q Check system task queues systemctl list-timers
Windows Equivalent (PowerShell):
Get-Process | Sort-Object CPU -Descending Priority-based process view
Expected Output:
A structured understanding of queues, with executable code snippets and OS-level commands for real-world implementation.
Further Reading:
References:
Reported By: Ashsau Queues – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
