README.md

Mutex and Channel basics

What is an atomic operation?

indivisible operation, an operation that is not interruptable. Implemented using hardware instructions

What is a semaphore?

Integer flag with value always greater than or equal to 0. It lets you communicate resource availability between threads. (atomic)

What is a mutex?

Mutual exclusion. the only one using it can Signal() and "unlock" it. A concept of ownership

What is the difference between a mutex and a binary semaphore?

Mutex, da har brukeren eierskapet og bestemmer når han vil sette den fri. Binary semaphore kan kaste ut brukeren, for å la noen andre bruke den. men den sørger for at bare en bruker den om gangen.

What is a critical section?

Code where the resource is blocked.

What is the difference between race conditions and data races?

Race conditions are when the result depends on the ordering in time.

A data race happens when there are two memory accesses in a program where both:

• target the same location
• are performed concurrently by two threads
• are not reads
• are not synchronization operations

List some advantages of using message passing over lock-based synchronization primitives.

No need for mutex or semaphores because no shared resources.

List some advantages of using lock-based synchronization primitives over message passing.

Doesn't need to think in another way then normal programming.