wait_event_interruptible and wake_up_interruptible

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Hi,

  Once I call wait_event_interruptible, is it important to call
wake_up_interruptible sometime later. wait_even_interruptible would
automatically awaken the sleeping process when the condition it takes as an
argument evaluates to TRUE, so in which specific cases do we require a
separate wake_up_interruptible. ?

thanks
Amit


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