15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/synchronization/lock_impl.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace internal { 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)LockImpl::LockImpl() { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The second parameter is the spin count, for short-held locks it avoid the 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // contending thread from going to sleep which helps performance greatly. 13d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) ::InitializeCriticalSectionAndSpinCount(&native_handle_, 2000); 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)LockImpl::~LockImpl() { 17d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) ::DeleteCriticalSection(&native_handle_); 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool LockImpl::Try() { 21d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) if (::TryEnterCriticalSection(&native_handle_) != FALSE) { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void LockImpl::Lock() { 28d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) ::EnterCriticalSection(&native_handle_); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void LockImpl::Unlock() { 32d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) ::LeaveCriticalSection(&native_handle_); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace internal 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 37