The NACHOS code you have been given is capable of executing user application programs, but in an extremely limited way. In particular, at most one user application process can run at a time, and the only system call that has been implemented is the halt system call that shuts down NACHOS. In this assignment, you will correct some of these deficiencies and turn NACHOS into a multiprogramming operating system with a working set of basic system calls.
For this assignment, in the first part, you are to modify NACHOS so that it can run multiple user applications at once. You are to implement the Fork(), Yield(), Exit(), Exec(), and Join() system calls. The detailed specifications for these system calls are discussed later
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