src/pkg/runtime/race/testdata/map_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 (
	"testing"
)

func TestRaceMapRW(t *testing.T) {
	m := make(map[int]int)
	ch := make(chan bool, 1)
	go func() {
		_ = m[1]
		ch <- true
	}()
	m[1] = 1
	<-ch
}

func TestRaceMapRW2(t *testing.T) {
	m := make(map[int]int)
	ch := make(chan bool, 1)
	go func() {
		_, _ = m[1]
		ch <- true
	}()
	m[1] = 1
	<-ch
}

func TestRaceMapRWArray(t *testing.T) {
	// Check instrumentation of unaddressable arrays (issue 4578).
	m := make(map[int][2]int)
	ch := make(chan bool, 1)
	go func() {
		_ = m[1][1]
		ch <- true
	}()
	m[2] = [2]int{1, 2}
	<-ch
}

func TestNoRaceMapRR(t *testing.T) {
	m := make(map[int]int)
	ch := make(chan bool, 1)
	go func() {
		_, _ = m[1]
		ch <- true
	}()
	_ = m[1]
	<-ch
}

func TestRaceMapRange(t *testing.T) {
	m := make(map[int]int)
	ch := make(chan bool, 1)
	go func() {
		for _ = range m {
		}
		ch <- true
	}()
	m[1] = 1
	<-ch
}

func TestRaceMapRange2(t *testing.T) {
	m := make(map[int]int)
	ch := make(chan bool, 1)
	go func() {
		for _ = range m {
		}
		ch <- true
	}()
	m[1] = 1
	<-ch
}

func TestNoRaceMapRangeRange(t *testing.T) {
	m := make(map[int]int)
	// now the map is not empty and range triggers an event
	// should work without this (as in other tests)
	// so it is suspicious if this test passes and others don't
	m[0] = 0
	ch := make(chan bool, 1)
	go func() {
		for _ = range m {
		}
		ch <- true
	}()
	for _ = range m {
	}
	<-ch
}

// Map len is not instrumented.
func TestRaceFailingMapLen(t *testing.T) {
	m := make(map[string]bool)
	ch := make(chan bool, 1)
	go func() {
		_ = len(m)
		ch <- true
	}()
	m[""] = true
	<-ch
}

func TestRaceMapDelete(t *testing.T) {
	m := make(map[string]bool)
	ch := make(chan bool, 1)
	go func() {
		delete(m, "")
		ch <- true
	}()
	m[""] = true
	<-ch
}

// Map len is not instrumented.
func TestRaceFailingMapLenDelete(t *testing.T) {
	m := make(map[string]bool)
	ch := make(chan bool, 1)
	go func() {
		delete(m, "a")
		ch <- true
	}()
	_ = len(m)
	<-ch
}

func TestRaceMapVariable(t *testing.T) {
	ch := make(chan bool, 1)
	m := make(map[int]int)
	go func() {
		m = make(map[int]int)
		ch <- true
	}()
	m = make(map[int]int)
	<-ch
}

func TestRaceMapVariable2(t *testing.T) {
	ch := make(chan bool, 1)
	m := make(map[int]int)
	go func() {
		m[1] = 1
		ch <- true
	}()
	m = make(map[int]int)
	<-ch
}

func TestRaceMapVariable3(t *testing.T) {
	ch := make(chan bool, 1)
	m := make(map[int]int)
	go func() {
		_ = m[1]
		ch <- true
	}()
	m = make(map[int]int)
	<-ch
}