Wakeup worker per eventfd

mentioned in issue #12

added 6 commits

• d703e030...0d91eae7 - 4 commits from branch i4/manycore:master
• 82346523 - [Runtime] wakeup workers using an eventfd instead of a condition variable
• 832edb37 - [Runtime] actually decrement sleepingWorkers with WorkerWakeupStrategy::once

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added 1 commit

• dae18a8e - [Runtime] use a eventfd to suspend/wakeup workes

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closed