1 #ifndef __LINUX_BIT_SPINLOCK_H
2 #define __LINUX_BIT_SPINLOCK_H
4 #include <linux/kernel.h>
5 #include <linux/preempt.h>
6 #include <linux/futex.h>
7 #include <urcu/futex.h>
9 static inline void bit_spin_lock(int nr, unsigned long *_addr)
11 u32 mask, *addr = ((u32 *) _addr) + (nr / 32), v;
17 v = __atomic_fetch_or(addr, mask, __ATOMIC_ACQUIRE);
21 futex(addr, FUTEX_WAIT|FUTEX_PRIVATE_FLAG, v, NULL, NULL, 0);
25 static inline void bit_spin_wake(int nr, unsigned long *_addr)
27 u32 *addr = ((u32 *) _addr) + (nr / 32);
29 futex(addr, FUTEX_WAKE|FUTEX_PRIVATE_FLAG, INT_MAX, NULL, NULL, 0);
32 static inline void bit_spin_unlock(int nr, unsigned long *_addr)
34 u32 mask, *addr = ((u32 *) _addr) + (nr / 32);
39 __atomic_and_fetch(addr, ~mask, __ATOMIC_RELEASE);
40 futex(addr, FUTEX_WAKE|FUTEX_PRIVATE_FLAG, INT_MAX, NULL, NULL, 0);
43 #endif /* __LINUX_BIT_SPINLOCK_H */