following strategies to prevent a race condition on the variable hits. The first strategy is to use a basic mutex lock when updating hits: int hits; mutex_lock hit_lock; hit_lock.acquire(); hits++; hit_lock.release();
following strategies to prevent a race condition on the variable hits. The first strategy is to use a basic mutex lock when updating hits: int hits; mutex_lock hit_lock; hit_lock.acquire(); hits++; hit_lock.release();
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
A multithreaded web server wishes to keep track of the number of requests it services (known as hits). Consider the two following strategies to prevent a race condition on the variable hits.
The first strategy is to use a basic mutex lock when updating hits:
int hits;
mutex_lock hit_lock;
hit_lock.acquire();
hits++;
hit_lock.release();
A second strategy is to use an atomic integer:
atomic_t hits;
atomic_inc(&hits);
Explain which of these two strategies is more efficient and why?
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