Code ReviewAdvanced~20 min

Review: Race Conditions and Thread Safety

pythonconcurrencythreadingrace-condition

Code Review Task

Please review the following Python code.

Background

This code is a counter system that operates in a multi-threaded environment. Multiple threads may update the counter simultaneously.

Review Aspects

Thread safety
Possibility of race conditions
Lock usage
Data consistency

Your Answer

counter.pypython

import threading
 
class Counter:
    """Simple counter class"""
    
    def __init__(self):
        self.count = 0
    
    def increment(self):
        """Increment counter by 1"""
        self.count += 1
    
    def decrement(self):
        """Decrement counter by 1"""
        if self.count > 0:
            self.count -= 1
    
    def get_count(self):
        """Get current count"""
        return self.count
    
    def add(self, value):
        """Add value to counter"""
        current = self.count
        self.count = current + value

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Model Answer

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