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#define RWSEM_UNLOCKED_VALUE            0x00000000

#define RWSEM_ACTIVE_BIAS               0x00000001

#define RWSEM_ACTIVE_MASK               0x0000ffff

#define RWSEM_WAITING_BIAS              (-0x00010000)

#define RWSEM_ACTIVE_READ_BIAS          RWSEM_ACTIVE_BIAS

#define RWSEM_ACTIVE_WRITE_BIAS         (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)

//static void init_rwsem(struct rw_semaphore *sem)

//{

//    sem->count = RWSEM_UNLOCKED_VALUE;

//    spin_lock_init(&sem->wait_lock);

//    INIT_LIST_HEAD(&sem->wait_list);