Putting a thread to sleep using schedule() is foolproof?

[Joshi]

Yes, there are other ways, but I have a doubt on one of the basic method of
sleeping -

set_current_state (TASK_INTERRUPTIBLE);
schedule ();

Is this a sure-shot way of putting a thread to sleep, or are there
conditions when this may not put the calling thread into sleep?

Almost always I see that the thread goes to sleep, until explicitly woken
up by another thread. But, once it a blue moon, I find that thread executes
the above instructions and does not go to sleep!

-- 
Joshi
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