Question

A fast-food restaurant has four kinds of employees: (1) order takers, who take customers' orders; (2) cooks, who prepare the food; (3) packaging specialists, who stuff the food into bags; and (4) cashiers, who give the bags to customers and take their money. each employee can be regarded as a communicating sequential process. what form of interprocess communication do they use? relate this model to processes in unix.

Answer 1

Answer:

Both direct communication(send(P,message),receive(id,message)) and indiect communication(send(A,message),receive(A,message)) can be used in the interprocess communication. Related UNIX processes(system calls):

simplest communication: using pipes

direct communication related system calls: msgget(), msgctl(),msgsnd() and msgrcv();

indirect commnunication related system calls: shmget();shmat();shmdt();shmctl();

Semorphore related: semget();semctl();semop() *********************************************************************

Explanation: