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Assignment No. 01
CS604 –Operating System
Total Marks: 10
Due Date: 20/05/2015
Rules for Marking:
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Question 1: (5 Marks)
Identify and explain which of the following state is being shared between parent and the child process when a process creates a new process using the fork() operation
b) Shared Memory Segment
Question 2: (5 Marks)
Consider UltraSPARC processor that has multiple register sets, if a new context is already loaded into one of the register then describe the action to be needed by context switch. Also describe that what will happen if new context is loaded into the memory rather than in register set and all registers are in use?
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Deadline: Your assignment must be uploaded/submitted on or before 20th May 2015.
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The fork() system call
When the fork system call is executed, a new process is created. The original process is called the parent process whereas the process is called the child process. The new process consists of a copy of the address space of the parent. This mechanism allows the parent process to communicate easily with the child process. On success, both processes
continue execution at the instruction after the fork call, with one difference, the return code for the fork system call is zero for the child process, while the process identifier of the child is returned to the parent process. On failure, a -1 will be returned in the parent's context, no child process will be created, and an error number will be set appropriately.
Answer: Only the shared memory segments are shared between the parent process and the newly forked child process. Copies of the stack and the heap are made for the newly created process.
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