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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "base/lock_impl.h" | 5 #include "base/lock_impl.h" |
6 #include "base/logging.h" | |
7 | 6 |
8 LockImpl::LockImpl() { | 7 LockImpl::LockImpl() { |
9 // The second parameter is the spin count, for short-held locks it avoid the | 8 // The second parameter is the spin count, for short-held locks it avoid the |
10 // contending thread from going to sleep which helps performance greatly. | 9 // contending thread from going to sleep which helps performance greatly. |
11 ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000); | 10 ::InitializeCriticalSectionAndSpinCount(&os_lock_, 2000); |
12 } | 11 } |
13 | 12 |
14 LockImpl::~LockImpl() { | 13 LockImpl::~LockImpl() { |
15 ::DeleteCriticalSection(&os_lock_); | 14 ::DeleteCriticalSection(&os_lock_); |
16 } | 15 } |
17 | 16 |
18 bool LockImpl::Try() { | 17 bool LockImpl::Try() { |
19 if (::TryEnterCriticalSection(&os_lock_) != FALSE) { | 18 if (::TryEnterCriticalSection(&os_lock_) != FALSE) { |
20 return true; | 19 return true; |
21 } | 20 } |
22 return false; | 21 return false; |
23 } | 22 } |
24 | 23 |
25 void LockImpl::Lock() { | 24 void LockImpl::Lock() { |
26 ::EnterCriticalSection(&os_lock_); | 25 ::EnterCriticalSection(&os_lock_); |
27 } | 26 } |
28 | 27 |
29 void LockImpl::Unlock() { | 28 void LockImpl::Unlock() { |
30 ::LeaveCriticalSection(&os_lock_); | 29 ::LeaveCriticalSection(&os_lock_); |
31 } | 30 } |
32 | |
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