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Define semaphore
A semaphore is a protected abstract or variable data type that constitutes the classic method for restricting access to shared resources like shared memory in a parallel programming environment.
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
advantages and disadvantages
Write a short note on PCB? Every process is represented in the operating system by a process control block also called a task control block. It contains more information regard
idle thread The special thread a dispatcher will run when no ready thread is found. The primary purpose of the idle process and its threads is to remove what would otherwise b
What are the necessary conditions for deadlocks? 1. Mutual exclusion : Only one process at a time is able to use the resource. 2. Hold and wait : A process should be holdi
why we say " OS is a resource allocator" and “OS is a control program"?
Explain process scheduling in time sharing The relevant features of time sharing are: 1. Process priorities do not depend on the nature of the processes 2. Proc
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importance of Operating system in modern computers. Also explain various functions & types of operating systems
Q. What resources are utilized when a thread is created? How do they vary from those used when a process is created? Answer: For the reason that a thread is smaller than a pr
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