| // 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) | |
| } | |
| } | |