8e496f1d69
This change removes the retry mechanism we use for buffered channels. Instead, any sender waking up a receiver or vice versa completes the full protocol with its counterpart. This means the counterpart does not need to relock the channel when it wakes up. (Currently buffered channels need to relock on wakeup.) For sends on a channel with waiting receivers, this change replaces two copies (sender->queue, queue->receiver) with one (sender->receiver). For receives on channels with a waiting sender, two copies are still required. This change unifies to a large degree the algorithm for buffered and unbuffered channels, simplifying the overall implementation. Fixes #11506 benchmark old ns/op new ns/op delta BenchmarkChanProdCons10 125 110 -12.00% BenchmarkChanProdCons0 303 284 -6.27% BenchmarkChanProdCons100 75.5 71.3 -5.56% BenchmarkChanContended 6452 6125 -5.07% BenchmarkChanNonblocking 11.5 11.0 -4.35% BenchmarkChanCreation 149 143 -4.03% BenchmarkChanSem 63.6 61.6 -3.14% BenchmarkChanUncontended 6390 6212 -2.79% BenchmarkChanSync 282 276 -2.13% BenchmarkChanProdConsWork10 516 506 -1.94% BenchmarkChanProdConsWork0 696 685 -1.58% BenchmarkChanProdConsWork100 470 469 -0.21% BenchmarkChanPopular 660427 660012 -0.06% Change-Id: I164113a56432fbc7cace0786e49c5a6e6a708ea4 Reviewed-on: https://go-review.googlesource.com/9345 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Austin Clements <austin@google.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> |
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