[pull] master from ruby:master #723
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Continually locking a mutex m can lead to starvation if all other threads are on the waitq of m. See https://bugs.ruby-lang.org/issues/21840 for more details. Solution: When a thread `T1` wakes up `T2` during mutex unlock but `T1` or any other thread successfully acquires it before `T2`, then we record the `running_time` of the thread during mutex acquisition. Then during unlock, if that thread's running_time is less than the saved running time, we set it back to the saved time. Fixes [Bug #21840]
We would like to do type matching on the VRegId. Extracting the VRegID from a usize makes the code a bit easier to understand and refactor. MemBase uses a VReg, and there is also a VReg in Opnd. We should be sharing types between these two, so this is a step in the direction of sharing a type
Until we get our global register allocator, we need our HIR to be in 100% block-local SSA. Add a validator to enforce that.
The RDoc link format has changed so these are all broken links.
The RDoc link format has changed so these are all broken links. ruby/net-http@97fe6085c3
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