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Assume that a system has multiple processing cores. For each of the following scenarios, describe which is a better locking mechanism—a spinlock or a mutex lock where waiting processes sleep while waiting for the lock to become available:
• The lock is to be held for a short duration.
• The lock is to be held for a long duration.
• A thread may be put to sleep while holding the lock
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.