* An MCS like lock especially tailored for optimistic spinning for sleeping
* lock implementations (mutex, rwsem, etc).
*/
-
-#define OSQ_UNLOCKED_VAL (0)
+struct optimistic_spin_node {
+ struct optimistic_spin_node *next, *prev;
+ int locked; /* 1 if lock acquired */
+ int cpu; /* encoded CPU # + 1 value */
+};
struct optimistic_spin_queue {
/*
atomic_t tail;
};
+#define OSQ_UNLOCKED_VAL (0)
+
/* Init macro and function. */
#define OSQ_LOCK_UNLOCKED { ATOMIC_INIT(OSQ_UNLOCKED_VAL) }
atomic_set(&lock->tail, OSQ_UNLOCKED_VAL);
}
+extern bool osq_lock(struct optimistic_spin_queue *lock);
+extern void osq_unlock(struct optimistic_spin_queue *lock);
+
#endif