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Suppose we have 3 processes running at the same time as shown in the following table. Each resource only has one instance.
Show a possible scenario of resource allocation that results in deadlock. Using a resource allocation graph to show the scenario.
To prevent the possibility of any deadlock, you may modify the order of getting resource requests of some process. Explain how and why. You can also use a resource allocation graph to justify your answer.
P1
P2
P3
while (1) {
get(A);
get(B);
get(C);
// critical region
// use A, B, C
release(A);
release(B);
release(C);
}
get(D);
get(E);
// use D, E, B
release(D);
release(E);
While (1) {
get(F);
// use C, F, D
release(F);
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Operating Systems 1. Illustrate the Microkernel Architecture with suitable diagram. 2. When Deadlock occurs? What are the Necessary Conditions for Deadlock? 3. Describe f
summary of what operating system do
SCAN o Go from the outside to the inside servicing requests and after that back from the outside to the inside servicing requests. o Replicate this over and over. o Diminish
Hashed page table method A general approach for managing address spaces larger than 32 bits is to use a hashed page table with the hash values being the virtual-page number.
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Question : a) Consider table 1.0 below, assume the processes arrived in the order P 1 , P 2 , P 3 , P 4 at time shown and need the indicated burst time (both in milliseconds)
Evicting the most-recently used (MRU) page does very well on LRU's worst case. In general, however, MRU is a bad idea, since many programs exhibit temporal locality in their memory
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