1 files changed, 40 insertions, 0 deletions
diff --git a/src/cmd/cgo/internal/testsanitizers/testdata/tsan7.go b/src/cmd/cgo/internal/testsanitizers/testdata/tsan7.go
new file mode 100644
index 0000000..2fb9e45
--- /dev/null
+++ b/src/cmd/cgo/internal/testsanitizers/testdata/tsan7.go
@@ -0,0 +1,40 @@
+// Copyright 2016 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 main
+
+// Setting an environment variable in a cgo program changes the C
+// environment. Test that this does not confuse the race detector.
+
+/*
+#cgo CFLAGS: -fsanitize=thread
+#cgo LDFLAGS: -fsanitize=thread
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"sync"
+	"time"
+)
+
+func main() {
+	var wg sync.WaitGroup
+	var mu sync.Mutex
+	f := func() {
+		defer wg.Done()
+		for i := 0; i < 100; i++ {
+			time.Sleep(time.Microsecond)
+			mu.Lock()
+			s := fmt.Sprint(i)
+			os.Setenv("TSAN_TEST"+s, s)
+			mu.Unlock()
+		}
+	}
+	wg.Add(2)
+	go f()
+	go f()
+	wg.Wait()
+}