Abstract away lockfile instead of pid ops in blobstore.

pkg/blobstore/lock_windows.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2011 The Grumble Authors
+// The use of this source code is goverened by a BSD-style
+// license that can be found in the LICENSE-file.
+
+package blobstore
+
+import (
+	"os"
+	"syscall"
+)
+
+const (
+	FILE_FLAG_DELETE_ON_CLOSE = 0x04000000
+)
+
+// Acquire a lockfile at path.
+func AcquireLockFile(path string) os.Error {
+	handle, _ := syscall.CreateFile(syscall.StringToUTF16Ptr(path), syscall.GENERIC_WRITE, 0, nil, syscall.CREATE_ALWAYS, FILE_FLAG_DELETE_ON_CLOSE, 0)
+	if handle < 0 {
+		return ErrLocked
+	}
+	return nil
+}
+
+// Release the lockfile at path.
+func ReleaseLockFile(path string) os.Error {
+	// No-op because we use FLAG_DELETE_ON_CLOSE.
+	return nil
+}