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Q. What system calls have to be implementing by a command interpreter or shell in order to start a new process?
Answer: In the UNIX systems a fork system call followed by an exec system call need to be performed to start a new process. The fork call clones the presently executing process while the exec call overlays a new process based on a different executable over the calling process.
Q. Multithreading is a commonly utilized programming technique. Illustrate three different ways that threads could be implemented. Describe how these ways compare to the Linux clon
Gang Scheduling : A set of related process is scheduled to execute on a set of processors at the similar time, on a 1-to-1 basis. Closely related processes or threads may be sched
How can a user program disturb the normal operation of the system? a) Issuing illegal I/O operation. b) By accessing memory locations within the OS itself. c) Refusing to
How many disk operations are needed to fetch the i-node for the file /usr/ast/courses/os/handout.t? Assume that the i-node for the root directory is in memory, but nothing else alo
Interrupts The hardware mechanism that enables a device to inform the CPU is called an interrupt. The basic interrupt mechanism works as follows. The CPU hardware has a wire kn
Q. You have devised a fresh page-replacement algorithm that you think may be optimal. In a few contorted test cases Belady's anomaly occurs. Is the fresh algorithm optimal? Descr
Explain the Sleep (ms) Function This call places the current thread in a suspended state for the number of milliseconds passed as the parameter (ms). After that Windows NT wil
Discuss the high barriers to entry in the market for PL operating systems
What is meant by context switch? Switching the CPU to another process needs saving the state of the old process and loading the saved state for the latest process. This task is
Explain Deadlock Prevention-Resource allocation graph allocation Resource allocation graph algorithm : Using this algorithm we are able to actually know if there exists in th
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