Learn Web Development with Python

Locks to the rescue

Locks come to the rescue when dealing with race conditions. For example, in order to fix the preceding example, all you need is a lock around the procedure. A lock is like a guardian that will allow only one thread to take hold of it (we say to acquire a lock), and until that thread releases the lock, no other thread can acquire it. They will have to sit and wait until the lock is available again.