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by eridius
3836 days ago
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There will not. QOS was a very large and intentional change, and it's critical to getting great performance out of iOS and to make the fanless MacBook work at all. In general, Apple has never encouraged anyone to use spinlocks, and as I mentioned at the end, as long as your critical section is really tiny and CPU-bound you're unlikely to actually have a problem in practice. Note that spinlocks have always had a problem with priority inversion (OSSpinLock's back-off algorithm is just to call syscall_thread_switch with a 1ms delay every 1024 iterations, which is not bad but doesn't solve all priority inversions anyway). |
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