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CMPT 334 A - Principles of Operating Systems (FA 2025)
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The security system of a laboratory is a complex motion detector system that ensures one person can be in any of the lab's function units, whether in the biology room, the chemistry lab, or the physics lab. If anybody new tries to enter these areas they get locked out. This structure is most similar to...
Deadlock avoidance is always worth implementing in an Operating System.
Is synchronization is a difficult unit? Hint: Yes.
Consider the following situation: Process 1 (P1): May request up to 5 s_1 resources and 2 s_2 resources.Process 2 (P2): May request up to 5 s_1 resources and 1 s_2 resources.s_1 is initialized to 8 s_1 resources and s_2 has 2 resources.Suppose the current situation is that P1 has 2 s_1 resources and 1 s_2 resources while P2 has 2 s_1 resources and 0 s_2 resources.Which of the following statements are true. Multiple answers are allowed. Suppose the system uses deadlock avoidance policies.Note: Incorrect answers give negative points while correct answers give positive points; if you select all answers you will get 0 out of 2.
To ensure only five people can write on a chalkboard, a teacher has only 5 pieces of chalk. When students are done writing they put it back in a pool.This approach is similar to a...
What does the reader/writer problem best show?
A software solution to synchronization is always better than a hardware solution
A box is locked with a single key so that only one person can look inside at a time. This is most similar to a...
Write down notes on any assumptions or clarifications for the Quiz/Exam answers.This category exists so if there is a major typo or issue in clarity I would be able to give a representative mark.
Consider the following pseudocode. Assume that it will compile and all relevant libraries are included.
============================================================
int arr_size=5;double sum=0;double grades[5] = {1,1,1,1, 1};void *sumThread(void * input){ for(int i=0;i<arr_size;i++){
sum+=grades[i];
}
}
void main (int argc, char *argv){ pthread_t thread0; pthread_create(&thread0, NULL, sumThread, NULL); printf("Sum=%d", sum);}
============================================================Which of the following outputs are possible with this program?