int
ttm_write_lock(struct ttm_lock *lock, bool interruptible)
{
const char *wmsg;
int flags, ret;
ret = 0;
if (interruptible) {
flags = PCATCH;
wmsg = "ttmwi";
} else {
flags = 0;
wmsg = "ttmw";
}
mtx_lock(&lock->lock);
/* XXXKIB: linux uses __ttm_read_lock for uninterruptible sleeps */
while (!__ttm_write_lock(lock)) {
ret = msleep(lock, &lock->lock, flags, wmsg, 0);
if (ret == EINTR)
ret = ERESTARTSYS;
if (interruptible && ret != 0) {
lock->flags &= ~TTM_WRITE_LOCK_PENDING;
wakeup(lock);
break;
}
}
mtx_unlock(&lock->lock);
return (-ret);
}
int ttm_write_lock(struct ttm_lock *lock, bool interruptible)
{
int ret = 0;
if (interruptible) {
ret = wait_event_interruptible(lock->queue,
__ttm_write_lock(lock));
if (unlikely(ret != 0)) {
spin_lock(&lock->lock);
lock->flags &= ~TTM_WRITE_LOCK_PENDING;
wake_up_all(&lock->queue);
spin_unlock(&lock->lock);
}
} else
wait_event(lock->queue, __ttm_read_lock(lock));
return ret;
}
int ttm_write_lock(struct ttm_lock *lock, bool interruptible)
{
printf("%s stub\n", __func__);
return -ENOSYS;
#ifdef notyet
int ret = 0;
if (interruptible) {
ret = wait_event_interruptible(lock->queue,
__ttm_write_lock(lock));
if (unlikely(ret != 0)) {
spin_lock(&lock->lock);
lock->flags &= ~TTM_WRITE_LOCK_PENDING;
wake_up_all(&lock->queue);
spin_unlock(&lock->lock);
}
} else
wait_event(lock->queue, __ttm_read_lock(lock));
return ret;
#endif
}
