| 82,5 → 82,31 |
|---|
| UpWrite(sem); |
| } |
| |
| #define RWSEM_UNLOCKED_VALUE 0x00000000L |
| #define RWSEM_ACTIVE_BIAS 0x00000001L |
| #define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1) |
| #define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS |
| #define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS) |
| |
| static inline int down_read_trylock(struct rw_semaphore *sem) |
| { |
| long result, tmp; |
| asm volatile("# beginning __down_read_trylock\n\t" |
| " mov %0,%1\n\t" |
| "1:\n\t" |
| " mov %1,%2\n\t" |
| " add %3,%2\n\t" |
| " jle 2f\n\t" |
| LOCK_PREFIX " cmpxchg %2,%0\n\t" |
| " jnz 1b\n\t" |
| "2:\n\t" |
| "# ending __down_read_trylock\n\t" |
| : "+m" (sem->count), "=&a" (result), "=&r" (tmp) |
| : "i" (RWSEM_ACTIVE_READ_BIAS) |
| : "memory", "cc"); |
| return result >= 0 ? 1 : 0; |
| } |
| |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _ASM_X86_RWSEM_H */ |