f9640b88c7
I added routines that can acquire/release a particular rank without acquiring/releasing an associated lock. I added lockRankGscan as a rank for acquiring/releasing the Gscan bit. castogscanstatus() and casGtoPreemptScan() are acquires of the Gscan bit. casfrom_Gscanstatus() is a release of the Gscan bit. casgstatus() is like an acquire and release of the Gscan bit, since it will wait if Gscan bit is currently set. We have a cycle between hchan and Gscan. The acquisition of Gscan and then hchan only happens in syncadjustsudogs() when the G is suspended, so the main normal ordering (get hchan, then get Gscan) can't be happening. So, I added a new rank lockRankHchanLeaf that is used when acquiring hchan locks in syncadjustsudogs. This ranking is set so no other locks can be acquired except other hchan locks. Fixes #38922 Change-Id: I58ce526a74ba856cb42078f7b9901f2832e1d45c Reviewed-on: https://go-review.googlesource.com/c/go/+/228417 Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com> |
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README.md
The Go Programming Language
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