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Moved exclusion logic to a higher level so that printf output is more readable when the same stdout FILE* is shared
by many pthreads (tasks did not have this probablem because they have separate stdout streams).


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Signal mask is now inherited by both child tasks and threads; this has the side-effect of changing the initia
l state of all signals from blocked to unblocked.


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task_delete() calls sched_unlock(); _exit must keep pre-emption disabled until pending queue emptied.


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