1 files changed, 44 insertions, 0 deletions
diff --git a/src/math/rand/v2/race_test.go b/src/math/rand/v2/race_test.go
new file mode 100644
index 0000000..5ab7a21
--- /dev/null
+++ b/src/math/rand/v2/race_test.go
@@ -0,0 +1,44 @@
+// 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 rand_test
+
+import (
+	. "math/rand/v2"
+	"sync"
+	"testing"
+)
+
+// TestConcurrent exercises the rand API concurrently, triggering situations
+// where the race detector is likely to detect issues.
+func TestConcurrent(t *testing.T) {
+	const (
+		numRoutines = 10
+		numCycles   = 10
+	)
+	var wg sync.WaitGroup
+	defer wg.Wait()
+	wg.Add(numRoutines)
+	for i := 0; i < numRoutines; i++ {
+		go func(i int) {
+			defer wg.Done()
+			var seed int64
+			for j := 0; j < numCycles; j++ {
+				seed += int64(ExpFloat64())
+				seed += int64(Float32())
+				seed += int64(Float64())
+				seed += int64(IntN(Int()))
+				seed += int64(Int32N(Int32()))
+				seed += int64(Int64N(Int64()))
+				seed += int64(NormFloat64())
+				seed += int64(Uint32())
+				seed += int64(Uint64())
+				for _, p := range Perm(10) {
+					seed += int64(p)
+				}
+			}
+			_ = seed
+		}(i)
+	}
+}