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📄 atomic_test.go(4.9 KB)
📄 cgo_test.go(497 B)
📄 cgo_test_main.go(415 B)
📄 chan_test.go(10.97 KB)
📄 comp_test.go(2.25 KB)
📄 finalizer_test.go(1.05 KB)
📄 io_test.go(1.29 KB)
📄 issue12225_test.go(455 B)
📄 issue12664_test.go(1.08 KB)
📄 issue13264_test.go(310 B)
📄 map_test.go(5.12 KB)
📄 mop_test.go(28.87 KB)
📄 mutex_test.go(1.98 KB)
📄 pool_test.go(933 B)
📄 reflect_test.go(811 B)
📄 regression_test.go(2.74 KB)
📄 rwmutex_test.go(2.08 KB)
📄 select_test.go(4.07 KB)
📄 slice_test.go(8.87 KB)
📄 sync_test.go(2.96 KB)
📄 waitgroup_test.go(5.27 KB)

Editing: mutex_test.go

// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package race_test

import (
	"sync"
	"testing"
	"time"
)

func TestNoRaceMutex(t *testing.T) {
	var mu sync.Mutex
	var x int16 = 0
	_ = x
	ch := make(chan bool, 2)
	go func() {
		mu.Lock()
		defer mu.Unlock()
		x = 1
		ch <- true
	}()
	go func() {
		mu.Lock()
		x = 2
		mu.Unlock()
		ch <- true
	}()
	<-ch
	<-ch
}

func TestRaceMutex(t *testing.T) {
	var mu sync.Mutex
	var x int16 = 0
	_ = x
	ch := make(chan bool, 2)
	go func() {
		x = 1
		mu.Lock()
		defer mu.Unlock()
		ch <- true
	}()
	go func() {
		x = 2
		mu.Lock()
		mu.Unlock()
		ch <- true
	}()
	<-ch
	<-ch
}

func TestRaceMutex2(t *testing.T) {
	var mu1 sync.Mutex
	var mu2 sync.Mutex
	var x int8 = 0
	_ = x
	ch := make(chan bool, 2)
	go func() {
		mu1.Lock()
		defer mu1.Unlock()
		x = 1
		ch <- true
	}()
	go func() {
		mu2.Lock()
		x = 2
		mu2.Unlock()
		ch <- true
	}()
	<-ch
	<-ch
}

func TestNoRaceMutexPureHappensBefore(t *testing.T) {
	var mu sync.Mutex
	var x int16 = 0
	_ = x
	written := false
	ch := make(chan bool, 2)
	go func() {
		x = 1
		mu.Lock()
		written = true
		mu.Unlock()
		ch <- true
	}()
	go func() {
		time.Sleep(100 * time.Microsecond)
		mu.Lock()
		for !written {
			mu.Unlock()
			time.Sleep(100 * time.Microsecond)
			mu.Lock()
		}
		mu.Unlock()
		x = 1
		ch <- true
	}()
	<-ch
	<-ch
}

func TestNoRaceMutexSemaphore(t *testing.T) {
	var mu sync.Mutex
	ch := make(chan bool, 2)
	x := 0
	_ = x
	mu.Lock()
	go func() {
		x = 1
		mu.Unlock()
		ch <- true
	}()
	go func() {
		mu.Lock()
		x = 2
		mu.Unlock()
		ch <- true
	}()
	<-ch
	<-ch
}

// from doc/go_mem.html
func TestNoRaceMutexExampleFromHtml(t *testing.T) {
	var l sync.Mutex
	a := ""

l.Lock()
	go func() {
		a = "hello, world"
		l.Unlock()
	}()
	l.Lock()
	_ = a
}

func TestRaceMutexOverwrite(t *testing.T) {
	c := make(chan bool, 1)
	var mu sync.Mutex
	go func() {
		mu = sync.Mutex{}
		c <- true
	}()
	mu.Lock()
	<-c
}

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Editing: mutex_test.go

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