Consider the below implementations of a semaphore's wait and signal operations: wait ) { disable interrupts; sem.value--; if (sem.value < 0) { save_state (current) ; // current process State[current] = Blocked; //A gets blocked Enqueue(current, sem.queue); current = select_from_ready_queue(0: State[current] = Running; restore_state (current); //B starts running signal){ disable interrupts; sem.value++; if (sem.value <= 0){ k = Dequeue(sem.queue); State[k] = Ready; Enqueue (k, ReadyQueue); } Enable interrupts; } Enable interrupts; } a) What are the critical sections inside the wait and signal operations which are protected by disabling and enabling of interrupts? b) Give example of a specific execution scenario for the above code leading to inconsistency if the critical sections inside implementation of wait() and signal) are not protected (by disabling of interrupts c) Suppose that process A calling semaphore wait() gets blocked and another process B is selected to run (refer to the above code). Since interrupts are enabled only at the completion of the wait operation, will B start executing with the interrupts disabled? Explain your answer.

Consider the below implementations of a semaphore's wait and signal operations: wait ) { disable interrupts; sem.value--; if (sem.value < 0) { save_state (current) ; // current process State[current] = Blocked; //A gets blocked Enqueue(current, sem.queue); current = select_from_ready_queue(0: State[current] = Running; restore_state (current); //B starts running signal){ disable interrupts; sem.value++; if (sem.value <= 0){ k = Dequeue(sem.queue); State[k] = Ready; Enqueue (k, ReadyQueue); } Enable interrupts; } Enable interrupts; } a) What are the critical sections inside the wait and signal operations which are protected by disabling and enabling of interrupts? b) Give example of a specific execution scenario for the above code leading to inconsistency if the critical sections inside implementation of wait() and signal) are not protected (by disabling of interrupts c) Suppose that process A calling semaphore wait() gets blocked and another process B is selected to run (refer to the above code). Since interrupts are enabled only at the completion of the wait operation, will B start executing with the interrupts disabled? Explain your answer.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Multiple Table

In a database, a table is used to store data in the form of rows and columns. Rows are aligned horizontally and identified by one or more values in a specific column. Columns are vertically aligned and identified by a unique column name.

Question

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Consider the below implementations of a semaphore's wait and signal operations:
wait ) {
disable interrupts;
sem.value--;
signal0 {
disable interrupts;
sem.value++;
if (sem.value < 0) {
save_state (current) ; // current process
State[current] = Blocked; //A gets blocked
Enqueue(current, sem.queue);
current = select_from_ready_queue();
State[current] = Running;
restore_state (current); //B starts running
}
Enable interrupts;
}
if (sem.value <= 0){
k= Dequeue(sem.queue);
State[k] = Ready;
Enqueue (k, ReadyQueue);
}
Enable interrupts;
}
a) What are the critical sections inside the wait and signal operations which are protected by
disabling and enabling of interrupts?
b) Give example of a specific execution scenario for the above code leading to inconsistency if
the critical sections inside implementation of wait) and signal) are not protected (by
disabling of interrupts
c) Suppose that process A calling semaphore wait() gets blocked and another process B is
selected to run (refer to the above code). Since interrupts are enabled only at the completion
of the wait operation, will B start executing with the interrupts disabled? Explain your
answer.

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