Consider the solution to the readers and writers problem based on semaphores (slides 6-7). Why do we need to check the variable rc in the following line of the reader procedure?
if (rc == 1) down(&db);

Question

Consider the solution to the readers and writers problem based on semaphores (slides 6-7). Why do we need to check the variable  rc  in the following line of the reader procedure? 
 if (rc == 1) down(&db);

Accepted Answer

to prevent readers after the first one from blocking on the semaphore db

Answer

to ensure that there is only one reader accessing the database at any given time

Answer

to block any writer that wants to access the database

Crowdly

Consider the solution to the readers and writers problem based on semaphores (sl...

Want instant access to all verified answers on moodle.royalholloway.ac.uk?