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Page Fault Handling conditions like, where the copy on write bit of a page is set and that page is send by more than one process, the Kernel assign new page and copies the content to the new page and the other processes have their instances to the old page. After recopying the Kernel updates the page table load with the new page number. Then Kernel removes the reference count of the old pfdata table store. Where the copy on write bit is set and no programs are sharing the page, the Kernel accepts the physical page to be reused by the processes. It shows the copy on disassociates bit and write the page from its disk copy, because other process can share the disk copy. Then it replaces the pfdata table entry from the page-queue as the new copy of the virtual page is not on the swap machine. It decrements the swap-use count for the page and if number drops to 0, frees the swap space.
Signal handling A signal is used in UNIX systems to inform a process that a particular event has occurred. 1. A signal is produced by the occurrence of a particular event.
Difference between cache and associate memory
People arrive at a barber shop at the rate of one every 4.5 minutes. If the shop is full (it can hold five people altogether), 30% of the potential customers leave and come back i
Q. Describe the purpose of the open() and close() operations. Answer: The open() operation notifies the system that the named file is about to become active. The c
Process termination A process terminates when it finishes implementing its final statement and asks the operating system to delete it by using the exit system call. At that tim
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what is ROM bios device driver
Operating Systems 1. Explain Micro-kernel? Specify the benefits of Micro-kernel? 2. Describe seven state process models used for OS with necessary diagram. Differentiate bet
Q. Consider a distributed system with two sites A and B. Consider whether site A can distinguish among the following: a. B goes down. b. The link between A and B goes down.
Explain the Spawnvp Function used in the netware Spawnvp(flags, execNmae, argv) This function executes similarly to spawnlp( ) except that parameters are passed as a v
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