By far Dekker's algorithm to ensure mutual-exclusion in concurrent programming: (https://en.wikipedia.org/wiki/Dekker%27s_algorithm https://en.wikipedia.org/wik

By far Dekker's algorithm to ensure mutual-exclusion in concurrent programming: (https://en.wikipedia.org/wiki/Dekker%27s_algorithm https://en.wikipedia.org/wiki/Dekker%27s_algorithm) Less than 10 lines of code to create a piece of art.