OS: What is the meaning of mutex ?

Question

What happens after you write “a.out” and press enter. What are the functionality performed by the OS after executable file is created of your code.

Answer 1

mutual exclusion:
You will occasionally want to access two resources at once. Perhaps you are using one of the resources, and then discover that the other resource is needed as well. There could be a problem if two threads attempt to claim both resources but lock the associated mutexes in different orders. For example, if the two threads lock mutexes 1 and 2 respectively, then a deadlock occurs when each attempts to lock the other mutex.