Autofill phone number enhancements and integration of Phone Number Util Library: part 1

third_party/libphonenumber/cpp/src/base/synchronization/lock_impl_win.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/synchronization/lock_impl.h"
+
+namespace base {
+namespace internal {
+
+LockImpl::LockImpl() {
+  // The second parameter is the spin count, for short-held locks it avoid the
+  // contending thread from going to sleep which helps performance greatly.
+  ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000);
+}
+
+LockImpl::~LockImpl() {
+  ::DeleteCriticalSection(&os_lock_);
+}
+
+bool LockImpl::Try() {
+  if (::TryEnterCriticalSection(&os_lock_) != FALSE) {
+    return true;
+  }
+  return false;
+}
+
+void LockImpl::Lock() {
+  ::EnterCriticalSection(&os_lock_);
+}
+
+void LockImpl::Unlock() {
+  ::LeaveCriticalSection(&os_lock_);
+}
+
+}  // namespace internal
+}  // namespace base