|  | // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 
|  | // Use of this source code is governed by a BSD-style license that can be | 
|  | // found in the LICENSE file. | 
|  |  | 
|  | #include "base/synchronization/lock_impl.h" | 
|  |  | 
|  | #include "base/debug/activity_tracker.h" | 
|  |  | 
|  | namespace base { | 
|  | namespace internal { | 
|  |  | 
|  | LockImpl::LockImpl() : native_handle_(SRWLOCK_INIT) {} | 
|  |  | 
|  | LockImpl::~LockImpl() = default; | 
|  |  | 
|  | bool LockImpl::Try() { | 
|  | return !!::TryAcquireSRWLockExclusive(&native_handle_); | 
|  | } | 
|  |  | 
|  | void LockImpl::Lock() { | 
|  | base::debug::ScopedLockAcquireActivity lock_activity(this); | 
|  | ::AcquireSRWLockExclusive(&native_handle_); | 
|  | } | 
|  |  | 
|  | void LockImpl::Unlock() { | 
|  | ::ReleaseSRWLockExclusive(&native_handle_); | 
|  | } | 
|  |  | 
|  | }  // namespace internal | 
|  | }  // namespace base |