1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/synchronization/lock_impl_win.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,36 @@
1.4 +// Copyright (c) 2011 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#include "base/synchronization/lock_impl.h"
1.9 +
1.10 +namespace base {
1.11 +namespace internal {
1.12 +
1.13 +LockImpl::LockImpl() {
1.14 + // The second parameter is the spin count, for short-held locks it avoid the
1.15 + // contending thread from going to sleep which helps performance greatly.
1.16 + ::InitializeCriticalSectionAndSpinCount(&native_handle_, 2000);
1.17 +}
1.18 +
1.19 +LockImpl::~LockImpl() {
1.20 + ::DeleteCriticalSection(&native_handle_);
1.21 +}
1.22 +
1.23 +bool LockImpl::Try() {
1.24 + if (::TryEnterCriticalSection(&native_handle_) != FALSE) {
1.25 + return true;
1.26 + }
1.27 + return false;
1.28 +}
1.29 +
1.30 +void LockImpl::Lock() {
1.31 + ::EnterCriticalSection(&native_handle_);
1.32 +}
1.33 +
1.34 +void LockImpl::Unlock() {
1.35 + ::LeaveCriticalSection(&native_handle_);
1.36 +}
1.37 +
1.38 +} // namespace internal
1.39 +} // namespace base
