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AsyncSemaphore and AsyncPriorityQueue. #147

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AsyncSemaphore and AsyncPriorityQueue. #147

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cheatfate
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if i > 0:
waiters.delete(0, i - 1)
# Workaround for callSoon() not worked correctly before
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callSoon calls getThreadDispatcher, why should this be needed here?


proc release*(asem: AsyncSemaphore) =
## Release a semaphore, incrementing internal counter by one.
if asem.counter >= asem.maxcounter:
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doAssert?

## If the internal counter is larger than zero on entry, decrement it by one
## and return immediately. If its zero on entry, block and wait until some
## other task has called ``release()`` to make it larger than 0.
while asem.counter <= 0:
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the loop should not be needed here - there will be exactly one queue item per count below zero so they should line up perfectly

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