- DECLARE_WAITQUEUE(wait, current);
-
- /* go to sleep */
- add_wait_queue(&channel_wqs[index].lx_queue, &wait);
-
- set_current_state(TASK_INTERRUPTIBLE);
- while (*p == NULL) {
- schedule();
-
- /* reset task state to interruptable otherwise
- we'll whizz round here like a very fast loopy
- thing. schedule() appears to return with state
- set to TASK_RUNNING.
-
- If the loaded SP program, for whatever reason,
- doesn't set up the shared structure *p will never
- become true. So whoever connected to either /dev/rt?
- or if it was kspd, will then take up rather a lot of
- processor cycles.
- */
-
- set_current_state(TASK_INTERRUPTIBLE);
+ DEFINE_WAIT(wait);
+
+ for (;;) {
+ prepare_to_wait(
+ &channel_wqs[index].lx_queue,
+ &wait, TASK_INTERRUPTIBLE);
+ smp_rmb();
+ if (*p != NULL)
+ break;
+ if (!signal_pending(current)) {
+ schedule();
+ continue;
+ }
+ ret = -ERESTARTSYS;
+ goto out_fail;