The code section below shows the structure to control multiple readers of a data. What variable is the lock "mutex" protecting? Why does it need to be protected? while (true) { wait(mutex); read_count++; if (read_count == 1) wait(rw_mutex); signal (mutex); /* reading is performed */ wait(mutex); read_count--; if (read_count == 0) signal(rw_mutex); signal (mutex);
The code section below shows the structure to control multiple readers of a data. What variable is the lock "mutex" protecting? Why does it need to be protected? while (true) { wait(mutex); read_count++; if (read_count == 1) wait(rw_mutex); signal (mutex); /* reading is performed */ wait(mutex); read_count--; if (read_count == 0) signal(rw_mutex); signal (mutex);
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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Transcribed Image Text:The code section below shows the structure to control multiple readers of a data.
What variable is the lock "mutex" protecting? Why does it need to be protected?
while (true) {
wait(mutex);
read_count++;
if (read_count == 1)
wait(rw_mutex);
signal (mutex);
/* reading is performed */
wait (mutex);
read_count--;
if (read_count == 0)
signal (rw_mutex);
signal(mutex);
}
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