Answer / sandeep

Spinlock is a busy wait. Semaphore is a sleep wait.
Spinlocks are used to get exclusive access to critical
section whereas semaphores are used for exclusive access and
also to synchronize processes and threads.
Spin locks are used when the critical sections it is
protecting is small and are held for a short time.
Semaphores can be held for longer time. Semaphores use spin
locks to access its control structures.
Spinlocks are kernel locking mechanism where as semaphores
are used in both kernel and user space.
Semaphores should not be used in interrupt handlers since
the code sleeps if the semaphore is not acquired.

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