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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "base/synchronization/lock_impl.h"
6 
7 namespace base {
8 namespace internal {
9 
LockImpl()10 LockImpl::LockImpl() {
11   // The second parameter is the spin count, for short-held locks it avoid the
12   // contending thread from going to sleep which helps performance greatly.
13   ::InitializeCriticalSectionAndSpinCount(&native_handle_, 2000);
14 }
15 
~LockImpl()16 LockImpl::~LockImpl() {
17   ::DeleteCriticalSection(&native_handle_);
18 }
19 
Try()20 bool LockImpl::Try() {
21   if (::TryEnterCriticalSection(&native_handle_) != FALSE) {
22     return true;
23   }
24   return false;
25 }
26 
Lock()27 void LockImpl::Lock() {
28   ::EnterCriticalSection(&native_handle_);
29 }
30 
Unlock()31 void LockImpl::Unlock() {
32   ::LeaveCriticalSection(&native_handle_);
33 }
34 
35 }  // namespace internal
36 }  // namespace base
37