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      1 // Copyright 2016 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package main
      6 
      7 // Setting an environment variable in a cgo program changes the C
      8 // environment. Test that this does not confuse the race detector.
      9 
     10 /*
     11 #cgo CFLAGS: -fsanitize=thread
     12 #cgo LDFLAGS: -fsanitize=thread
     13 */
     14 import "C"
     15 
     16 import (
     17 	"fmt"
     18 	"os"
     19 	"sync"
     20 	"time"
     21 )
     22 
     23 func main() {
     24 	var wg sync.WaitGroup
     25 	var mu sync.Mutex
     26 	f := func() {
     27 		defer wg.Done()
     28 		for i := 0; i < 100; i++ {
     29 			time.Sleep(time.Microsecond)
     30 			mu.Lock()
     31 			s := fmt.Sprint(i)
     32 			os.Setenv("TSAN_TEST"+s, s)
     33 			mu.Unlock()
     34 		}
     35 	}
     36 	wg.Add(2)
     37 	go f()
     38 	go f()
     39 	wg.Wait()
     40 }
     41