| /* |
| * Copyright 2008 Google Inc. All Rights Reserved. |
| * Author: [email protected] (Michael Davidson) |
| * |
| * Based on time-warp-test.c, which is: |
| * Copyright (C) 2005, Ingo Molnar |
| */ |
| |
| #ifndef SPINLOCK_H_ |
| #define SPINLOCK_H_ |
| |
| typedef unsigned long spinlock_t; |
| |
| static inline void spin_lock(spinlock_t *lock) |
| { |
| __asm__ __volatile__( |
| "1: rep; nop\n" |
| " lock; btsl $0,%0\n" |
| "jc 1b\n" |
| : "=g"(*lock) : : "memory"); |
| } |
| |
| static inline void spin_unlock(spinlock_t *lock) |
| { |
| __asm__ __volatile__("movl $0,%0; rep; nop" : "=g"(*lock) :: "memory"); |
| } |
| |
| #endif /* SPINLOCK_H_ */ |
