In the solution provided for readers-writers problem above, if a writer is in the critical section, and multiple readers and writers are waiting, A) all waiting readers will be allowed to enter the critical section when the writer in the critical section exits. B) all waiting writers will be allowed to enter the critical section when the writer in the critical section exits. C) exactly one of the waiting writers will be allowed to enter the critical section when the writer in the critical section exits. D) either all waiting readers or exactly one writer will be allowed to enter the critical section.

In the solution provided for readers-writers problem above, if a writer is in the critical section, and multiple readers and writers are waiting, A) all waiting readers will be allowed to enter the critical section when the writer in the critical section exits. B) all waiting writers will be allowed to enter the critical section when the writer in the critical section exits. C) exactly one of the waiting writers will be allowed to enter the critical section when the writer in the critical section exits. D) either all waiting readers or exactly one writer will be allowed to enter the critical section.

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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Question

Can you help me with question 14

In the solution provided for readers-writers problem above, if a writer is in the
critical section, and multiple readers and writers are waiting,
A) all waiting readers will be allowed to enter the critical section when the writer
in the critical section exits.
B) all waiting writers will be allowed to enter the critical section when the writer
in the critical section exits.
C) exactly one of the waiting writers will be allowed to enter the critical section
when the writer in the critical section exits.
D) either all waiting readers or exactly one writer will be allowed to enter the
critical section.

//writer
while (true) {
wait(rw_mutex);
/* writing is performed */
signal(rw_mutex);
//reader
while (true) {
wait(mutex);
read_count++;
if (read_count == 1)
wait (rw_mutex);
signal (mutex);
/* reading is performed */
wait(mutex);
read count--p
if (read_count == 0)
signal(rw_mutex);
signal(mutex);
In the solution provided for readers-writers problem above, if a writer is in the
critical section, and multiple readers and writers are waiting,

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