Fix futexNeedsWake() on 64-bit systems
It was mistaking semaphore values over 0 as waiters, regardless of actual waiters. Pick-to: 6.1 Change-Id: Icebd01592ca8bdc1687a29dc569e3b630a262606 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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@ -150,10 +150,11 @@ static int futexAvailCounter(quintptr v)
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static bool futexNeedsWake(quintptr v)
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{
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// If we're counting waiters, the number of waiters is stored in the low 31
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// bits of the high word (that is, bits 32-62). If we're not, then we use
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// bit 31 to indicate anyone is waiting. Either way, if any bit 31 or above
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// is set, there are waiters.
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// If we're counting waiters, the number of waiters plus value is stored in the
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// low 31 bits of the high word (that is, bits 32-62). If we're not, then we only
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// use futexNeedsWakeAllBit to indicate anyone is waiting.
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if constexpr (futexHasWaiterCount)
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return (v >> 32) > (unsigned(v));
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return v >> 31;
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}
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