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// 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.
//go:build windows && race
package race_test
import (
"sync/atomic"
"syscall"
"testing"
"unsafe"
)
func TestAtomicMmap(t *testing.T) {
// Test that atomic operations work on "external" memory. Previously they crashed (#16206).
// Also do a sanity correctness check: under race detector atomic operations
// are implemented inside of race runtime.
kernel32 := syscall.NewLazyDLL("kernel32.dll")
VirtualAlloc := kernel32.NewProc("VirtualAlloc")
VirtualFree := kernel32.NewProc("VirtualFree")
const (
MEM_COMMIT = 0x00001000
MEM_RESERVE = 0x00002000
MEM_RELEASE = 0x8000
PAGE_READWRITE = 0x04
)
mem, _, err := syscall.Syscall6(VirtualAlloc.Addr(), 4, 0, 1<<20, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE, 0, 0)
if err != 0 {
t.Fatalf("VirtualAlloc failed: %v", err)
}
defer syscall.Syscall(VirtualFree.Addr(), 3, mem, 1<<20, MEM_RELEASE)
a := (*uint64)(unsafe.Pointer(mem))
if *a != 0 {
t.Fatalf("bad atomic value: %v, want 0", *a)
}
atomic.AddUint64(a, 1)
if *a != 1 {
t.Fatalf("bad atomic value: %v, want 1", *a)
}
atomic.AddUint64(a, 1)
if *a != 2 {
t.Fatalf("bad atomic value: %v, want 2", *a)
}
}
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