Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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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.
expand button
Transcribed Image Text: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,
expand button
Transcribed Image Text://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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