From ba4dfa7172a00f8b104a75a4655fe3de1e4a94c9 Mon Sep 17 00:00:00 2001
From: Jamie Liu <jamieliu@google.com>
Date: Wed, 24 Feb 2021 11:55:02 -0800
Subject: Move //pkg/gate.Gate to //pkg/sync.
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- Use atomic add rather than CAS in every Gate method, which is slightly
  faster in most cases.

- Implement Close wakeup using gopark/goready to avoid channel allocation.

New benchmarks:
name                         old time/op  new time/op  delta
GateEnterLeave-12            16.7ns ± 1%  10.3ns ± 1%  -38.44%  (p=0.000 n=9+8)
GateClose-12                 50.2ns ± 8%  42.4ns ± 6%  -15.44%  (p=0.000 n=10+10)
GateEnterLeaveAsyncClose-12   972ns ± 2%   640ns ± 7%  -34.15%  (p=0.000 n=9+10)

PiperOrigin-RevId: 359336344
---
 pkg/sync/BUILD | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pkg/sync/BUILD')

diff --git a/pkg/sync/BUILD b/pkg/sync/BUILD
index 2e2395807..b2c5229e7 100644
--- a/pkg/sync/BUILD
+++ b/pkg/sync/BUILD
@@ -52,6 +52,7 @@ go_library(
         "aliases.go",
         "checklocks_off_unsafe.go",
         "checklocks_on_unsafe.go",
+        "gate_unsafe.go",
         "goyield_go113_unsafe.go",
         "goyield_unsafe.go",
         "mutex_unsafe.go",
@@ -69,6 +70,7 @@ go_library(
     stateify = False,
     visibility = ["//:sandbox"],
     deps = [
+        "//pkg/gohacks",
         "//pkg/goid",
     ],
 )
@@ -77,6 +79,7 @@ go_test(
     name = "sync_test",
     size = "small",
     srcs = [
+        "gate_test.go",
         "mutex_test.go",
         "rwmutex_test.go",
         "seqcount_test.go",
-- 
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