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runtime: call osyield directly in lockextra
The `yield := osyield` line doesn't serve any purpose, it's committed in `2015`, time to delete that line:)
Change-Id: I382d4d32cf320f054f011f3b6684c868cbcb0ff2
GitHub-Last-Rev: 7a0aa25e55
GitHub-Pull-Request: golang/go#36078
Reviewed-on: https://go-review.googlesource.com/c/go/+/210837
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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@ -1691,8 +1691,7 @@ func lockextra(nilokay bool) *m {
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for {
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old := atomic.Loaduintptr(&extram)
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if old == locked {
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yield := osyield
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yield()
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osyield()
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continue
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}
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if old == 0 && !nilokay {
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@ -1709,8 +1708,7 @@ func lockextra(nilokay bool) *m {
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if atomic.Casuintptr(&extram, old, locked) {
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return (*m)(unsafe.Pointer(old))
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}
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yield := osyield
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yield()
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osyield()
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continue
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}
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}
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