37ea182660
If two goroutines are racing on a map, one of them will exit cleanly, clearing the hashWriting bit, and the other will likely notice and panic. If we use XOR instead of OR to set the bit in the first place, even numbers of racers will hopefully all see the bit cleared and panic simultaneously, giving the full set of available stacks. If a third racer sneaks in, we are no worse than the current code, and the generated code should be no more expensive. In practice, this catches most racing goroutines even in very tight races. See the demonstration program posted on https://github.com/golang/go/issues/26703 for an example. Fixes #26703 Change-Id: Idad17841a3127c24bd0a659b754734f70e307434 Reviewed-on: https://go-review.googlesource.com/126936 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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