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1. A barrier is a synchronization primitive. When created or reset with CreateBarrier(n) or SetBarrier(n), it waits for n processes to call WaitAtBarrier() before the barrier falls. Until the barrier falls, processes that call WaitAtBarrier() must wait; once the barrier falls, all processes waiting at this barrier are allowed to proceed unconditionally. Show how to implement barriers using semaphores. Your solution should avoid busy-waiting. Be explicit about any initializations that you need to assume.
How many page faults would occur under pure demand paging (all frames are initially empty), assuming four frames are available, under FIFO, LRU.
What is the difference between a safe state and an unsafe state in a deadlock-avoidance system?
What (if any) relation holds between the following pairs of sets of algorithms (a) Priority and SJF (b) Multilevel feedback queues and FCFS
Discuss challenges that handheld devices provide for computer forensics. Compare the forensic tools for UNIX environments (e.g, the Sleuth and TCT) with tools for Windows environments
Consider a dynamic RAM that must be given a refresh cycle 64 times per ms. What percentage of the memory's total operating time must be given to refreshes?
Forking the child process
Remembering that there's a trade-off between memory use. Then give an example where doing so will cause throughput to suffer.
What is Life Cycle Costing. Describe briefly the methodology for Life Cycle Costing. What are the criteria to consider when a procurement officer is faced with the decision of procuring a used equipment instead of a new one.
Use the semaphore methods to control the concurrency of the solution
Deadlock Avoidance and Scheduling
Assuming fetches to main memory are started in parallel with look-ups in cache, calculate the effective (average) access time of this system.
How many page faults are generated by the following arrayinitialization loops, using LRU replacement, and assuming page frame 1 has the process in it, and the other two are initially empty.
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