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This state is to allow some experimentation and not YET used.. The theory is that a thread that is about to sleep is placed on the sleep queue and then discovers it should suspend, and is placed on suspend queue. (these are separate queues and it can be on both). It will not become runnable until it has been removed from BOTH queues. i.e. a wakeup event has occured AND the process has been unsuspended. If it were not on the sleep queue when suspended, then the (possibly only) wakeup event might arrive and not find any process to wake up. this would result in the thread sleeping 'forever' when the suspension is lifted. This state will transition to one of TDS_SLP or TDS_SUSPENDED, depending upon which constraint is lifted first.
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