Golang：指针接收器和非指针接收器的数据竞争差异

-race

package main

import (
    "fmt"
    "testing"
)

type TestStruct struct {
    display    bool
    OtherValue int
}

func (t TestStruct) Display() bool {
    return t.display
}

func (t *TestStruct) DisplayP() bool {
    return t.display
}

func TestNonPointerRecevier(t *testing.T) {
    v := &TestStruct{
        display: true,
    }

    go func() {
        v.OtherValue = 1
    }()
    go func() {
        fmt.Println(v.Display())
    }()
}

func TestPointerRecevier(t *testing.T) {
    v := &TestStruct{
        display: true,
    }

    go func() {
        v.OtherValue = 1
    }()
    go func() {
        fmt.Println(v.DisplayP())
    }()
}

使用指针接收器方法没有错误

go test -race -run ^TestPointerRecevier$
true
PASS
ok      _/Users/xxxxx/projects/golang/datarace  0.254s

使用non-pointer接收器方法时出现此错误

go test -race -run ^TestNonPointerRecevier$
==================
WARNING: DATA RACE
Read at 0x00c00001c2c8 by goroutine 9:
  _/Users/xxxxx/projects/golang/datarace.TestNonPointerRecevier.func2()
      /Users/xxxxx/projects/golang/datarace/main_test.go:30 +0x47

Previous write at 0x00c00001c2c8 by goroutine 8:
  _/Users/xxxxx/projects/golang/datarace.TestNonPointerRecevier.func1()
      /Users/xxxxx/projects/golang/datarace/main_test.go:27 +0x3e

Goroutine 9 (running) created at:
  _/Users/xxxxx/projects/golang/datarace.TestNonPointerRecevier()
      /Users/xxxxx/projects/golang/datarace/main_test.go:29 +0xba
  testing.tRunner()
      /usr/local/Cellar/go/1.15.6/libexec/src/testing/testing.go:1123 +0x202

Goroutine 8 (finished) created at:
  _/Users/xxxxx/projects/golang/datarace.TestNonPointerRecevier()
      /Users/xxxxx/projects/golang/datarace/main_test.go:26 +0x98
  testing.tRunner()
      /usr/local/Cellar/go/1.15.6/libexec/src/testing/testing.go:1123 +0x202
==================
true
FAIL
exit status 1
FAIL    _/Users/xxxxx/projects/golang/datarace  0.103s