void __lockfunc rt_read_lock(rwlock_t *rwlock)
{
struct rt_mutex *lock = &rwlock->lock;
rwlock_acquire_read(&rwlock->dep_map, 0, 0, _RET_IP_);
/*
* recursive read locks succeed when current owns the lock
*/
if (rt_mutex_real_owner(lock) != current)
__rt_spin_lock(lock);
rwlock->read_depth++;
}
void __lockfunc rt_read_lock(rwlock_t *rwlock)
{
unsigned long flags;
struct rt_mutex *lock = &rwlock->lock;
rwlock_acquire_read(&rwlock->dep_map, 0, 0, _RET_IP_);
/*
* Read locks within the write lock succeed.
*/
spin_lock_irqsave(&lock->wait_lock, flags);
if (rt_mutex_real_owner(lock) == current) {
spin_unlock_irqrestore(&lock->wait_lock, flags);
rwlock->read_depth++;
return;
}
spin_unlock_irqrestore(&lock->wait_lock, flags);
__rt_spin_lock(lock);
}
void __lockfunc rt_write_lock(rwlock_t *rwlock)
{
rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
__rt_spin_lock(&rwlock->lock);
}