There are two processes running on two cores in one CPU (same OS). They are shar

Q: There are two processes running on two cores in one CPU (same OS). They are shar

We use semaphore to acquire shared resources so that no RACE condition arrives. So in this question, while reading or writing into 'share' vairable we have to use semaphore. P: while(1) { signal(s);temp = share; wait(s);temp = temp + 1;signal(s) share = temp;wait(s) } C: while(1) { signal(s);temp = share; wait(s); }

ID: 3936068 • Letter: T

Question

There are two processes running on two cores in one CPU (same OS).

They are sharing a memory location called “share” (with a start value of 0).

P: while(1) { temp = share; temp = temp + 1; share = temp; }

C: while(1) { temp = share; cout << temp; }

• We want print the numbers: 1,2,3,4,5 etc consecutively with no gaps. Using a binary semaphore called “s” and the semaphore operations:

signal(s) – which indicates the semaphore (resource) will be used and

wait(s) – which waits until the resource is available,

modify P and C to print, in order.

Explanation / Answer

We use semaphore to acquire shared resources so that no RACE condition arrives. So in this question, while reading or writing into 'share' vairable we have to use semaphore.

P: while(1) { signal(s);temp = share; wait(s);temp = temp + 1;signal(s) share = temp;wait(s) }

C: while(1) { signal(s);temp = share; wait(s); }

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There are two processes running on two cores in one CPU (same OS). They are shar

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There are two processes running on two cores in one CPU (same OS). They are shar

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