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// Copyright 2014 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.
//go:build race && (darwin || freebsd || linux)
package race_test
import (
"sync/atomic"
"syscall"
"testing"
"unsafe"
)
// Test that race detector does not crash when accessing non-Go allocated memory (issue 9136).
func TestNonGoMemory(t *testing.T) {
data, err := syscall.Mmap(-1, 0, 4096, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
if err != nil {
t.Fatalf("failed to mmap memory: %v", err)
}
p := (*uint32)(unsafe.Pointer(&data[0]))
atomic.AddUint32(p, 1)
(*p)++
if *p != 2 {
t.Fatalf("data[0] = %v, expect 2", *p)
}
syscall.Munmap(data)
}
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