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/unet/unet.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'pkg/unet/unet.go')

diff --git a/pkg/unet/unet.go b/pkg/unet/unet.go
index c976d7230..22dd40f21 100644
--- a/pkg/unet/unet.go
+++ b/pkg/unet/unet.go
@@ -23,7 +23,7 @@ import (
 	"sync/atomic"
 	"syscall"
 
-	"gvisor.dev/gvisor/pkg/gate"
+	"gvisor.dev/gvisor/pkg/sync"
 )
 
 // backlog is used for the listen request.
@@ -67,7 +67,7 @@ func eventFD() (int, error) {
 // Socket is a connected unix domain socket.
 type Socket struct {
 	// gate protects use of fd.
-	gate gate.Gate
+	gate sync.Gate
 
 	// fd is the bound socket.
 	//
-- 
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