SCHOLASTIC E-BOOK FAIR EWALLET: A PROTECTED, CASHLESS WAY TO SHOP

This may be called from any process or thread, not onlythe course of or thread which originally acquired the lock. With the block argument set to False, the method name does notblock. If the lock is presently in a locked state, return False;otherwise set the lock to a locked state and return True. If a course of is killed while it's making an attem