base/synchronization/lock_impl_win.cc

   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
  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(&os_lock_, 2000);
  14 }
  15
  16 LockImpl::~LockImpl() {
  17   ::DeleteCriticalSection(&os_lock_);
  18 }
  19
  20 bool LockImpl::Try() {
  21   if (::TryEnterCriticalSection(&os_lock_) != FALSE) {
  22     return true;
  23   }
  24   return false;
  25 }
  26
  27 void LockImpl::Lock() {
  28   ::EnterCriticalSection(&os_lock_);
  29 }
  30
  31 void LockImpl::Unlock() {
  32   ::LeaveCriticalSection(&os_lock_);
  33 }
  34
  35 }  // namespace internal
  36 }  // namespace base