spinlock
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Spinlock usually used in code that cannot sleep, thus has higher performance than semaphores.
Spinlock is implemented as a bit in an integer value.
Before using, a spinlock must be initialized as follows:
1 spinlock_t my_lock = SPIN_LOCK_UNLOCKED; 2 void spin_lock_init(spinlock_t *lock);
Beforing entering the critical section, code must obtain the requisite lock with:
1 void spin_lock(spinlock_t *lock);
Note that all spinlock are uninterruptible, whick means once you call spin_lock, you will spin until the lock become available.
To release a lock that you have obtained, pass it to:
1 void spin_unlock(spinlock_t *lock);
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