1 files changed, 77 insertions, 0 deletions
diff --git a/src/runtime/testdata/testprog/map.go b/src/runtime/testdata/testprog/map.go
new file mode 100644
index 0000000..5524289
--- /dev/null
+++ b/src/runtime/testdata/testprog/map.go
@@ -0,0 +1,77 @@
+// 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
+
+import "runtime"
+
+func init() {
+	register("concurrentMapWrites", concurrentMapWrites)
+	register("concurrentMapReadWrite", concurrentMapReadWrite)
+	register("concurrentMapIterateWrite", concurrentMapIterateWrite)
+}
+
+func concurrentMapWrites() {
+	m := map[int]int{}
+	c := make(chan struct{})
+	go func() {
+		for i := 0; i < 10000; i++ {
+			m[5] = 0
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	go func() {
+		for i := 0; i < 10000; i++ {
+			m[6] = 0
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	<-c
+	<-c
+}
+
+func concurrentMapReadWrite() {
+	m := map[int]int{}
+	c := make(chan struct{})
+	go func() {
+		for i := 0; i < 10000; i++ {
+			m[5] = 0
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	go func() {
+		for i := 0; i < 10000; i++ {
+			_ = m[6]
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	<-c
+	<-c
+}
+
+func concurrentMapIterateWrite() {
+	m := map[int]int{}
+	c := make(chan struct{})
+	go func() {
+		for i := 0; i < 10000; i++ {
+			m[5] = 0
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	go func() {
+		for i := 0; i < 10000; i++ {
+			for range m {
+			}
+			runtime.Gosched()
+		}
+		c <- struct{}{}
+	}()
+	<-c
+	<-c
+}