race_windows_test.go

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build windows && race
     6  
     7  package race_test
     8  
     9  import (
    10  	"sync/atomic"
    11  	"syscall"
    12  	"testing"
    13  	"unsafe"
    14  )
    15  
    16  func TestAtomicMmap(t *testing.T) {
    17  	// Test that atomic operations work on "external" memory. Previously they crashed (#16206).
    18  	// Also do a sanity correctness check: under race detector atomic operations
    19  	// are implemented inside of race runtime.
    20  	kernel32 := syscall.NewLazyDLL("kernel32.dll")
    21  	VirtualAlloc := kernel32.NewProc("VirtualAlloc")
    22  	VirtualFree := kernel32.NewProc("VirtualFree")
    23  	const (
    24  		MEM_COMMIT     = 0x00001000
    25  		MEM_RESERVE    = 0x00002000
    26  		MEM_RELEASE    = 0x8000
    27  		PAGE_READWRITE = 0x04
    28  	)
    29  	mem, _, err := syscall.Syscall6(VirtualAlloc.Addr(), 4, 0, 1<<20, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE, 0, 0)
    30  	if err != 0 {
    31  		t.Fatalf("VirtualAlloc failed: %v", err)
    32  	}
    33  	defer syscall.Syscall(VirtualFree.Addr(), 3, mem, 1<<20, MEM_RELEASE)
    34  	a := (*uint64)(unsafe.Pointer(mem))
    35  	if *a != 0 {
    36  		t.Fatalf("bad atomic value: %v, want 0", *a)
    37  	}
    38  	atomic.AddUint64(a, 1)
    39  	if *a != 1 {
    40  		t.Fatalf("bad atomic value: %v, want 1", *a)
    41  	}
    42  	atomic.AddUint64(a, 1)
    43  	if *a != 2 {
    44  		t.Fatalf("bad atomic value: %v, want 2", *a)
    45  	}
    46  }
    47
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