> Its luck on your part then. There is no provision in the system for handling
> that race using interruptible_sleep_on, because you can construct multiple
> correct solutions without having to hack the kernel up
In this case, what good is the sleep_on stuff? Wouldn't the cleaner
solution be to:
1) add an option to signal the wait queue in the wake_up function, if the
queue is empty (or perhaps even keep it signalled, even if there are
queued tasks).
2) for the sleep_on function, add an option to be immediately awoken if
entering an already signalled queue (and clear the signal).
This would hide all the ugliness, no? And prevent a lot of incorrect
drivers being written, just because some folks didn't catch on to this
race (e.g. Dick Johnson's posting).
-Mark
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