How to avoid deadlocks?

Question

When using multiple threads, shared memory needs to be locked by critical sections. However, using critical sections causes potential deadlocks. How can they be avoided?

Answer 1

Among the various methods to enter critical sections -- semaphores and mutexs are the most popular.

• A semaphore is a waiting mechanism and mutex is a locking mechanism, well the concept is confusing to the most, but in short, a thread activating a mutex can only deactivate it. with this in mind...

• Dont allow any process to lock partial no of resources, if a process need 5 resources, wait until all the are available.

• if u use semaphore here, u can unblock/un-wait the resource occupied by other thread. by this i mean pre-emption is another reason.

These 2 according to me are the basic conditions, the remaining 2 of the common 4 precautions can be related to these.

If u dont agree ps add comments. I've gtg already late, I will later add a cleaner and clearer explanation.