gistfile1

# What's wrong with List's "insert" method if called from multiple threads?
# How would you fix it?

class Node:
    def __init__(self, value):
        self.value = value
        self.next = None

class List:           
    def __init__(self):
        self.head = None
    
    def insert(self, value):
        new_node = self.Node(value)
        if (self.head == None):
            self.head = new_node
        else:
            current = self.head
            while (current.next != None):
                current = current.next
            current.next = new_node