michael@0: // Copyright (c) 2011 The Chromium Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: 
michael@0: #include "base/synchronization/lock_impl.h"
michael@0: 
michael@0: namespace base {
michael@0: namespace internal {
michael@0: 
michael@0: LockImpl::LockImpl() {
michael@0:   // The second parameter is the spin count, for short-held locks it avoid the
michael@0:   // contending thread from going to sleep which helps performance greatly.
michael@0:   ::InitializeCriticalSectionAndSpinCount(&native_handle_, 2000);
michael@0: }
michael@0: 
michael@0: LockImpl::~LockImpl() {
michael@0:   ::DeleteCriticalSection(&native_handle_);
michael@0: }
michael@0: 
michael@0: bool LockImpl::Try() {
michael@0:   if (::TryEnterCriticalSection(&native_handle_) != FALSE) {
michael@0:     return true;
michael@0:   }
michael@0:   return false;
michael@0: }
michael@0: 
michael@0: void LockImpl::Lock() {
michael@0:   ::EnterCriticalSection(&native_handle_);
michael@0: }
michael@0: 
michael@0: void LockImpl::Unlock() {
michael@0:   ::LeaveCriticalSection(&native_handle_);
michael@0: }
michael@0: 
michael@0: }  // namespace internal
michael@0: }  // namespace base