Python Parallel Programming Cookbook

Thread synchronization with a condition

A condition identifies a change of state in the application. This is a synchronization mechanism where a thread waits for a specific condition and another thread notifies that this condition has taken place. Once the condition takes place, the thread acquires the lock to get exclusive access to the shared resource.

Getting ready

A good way to illustrate this mechanism is by looking again at a producer/consumer problem. The class producer writes to a buffer as long as it is not full, and the class consumer takes the data from the buffer (eliminating them from the latter), as long as the buffer is full. The class producer will notify the consumer that the buffer is not empty, while the consumer will report to ...