mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 15:00:50 +01:00
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
|
// 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"
|
||
|
|
|
||
|
|
#include <windows.h>
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
namespace internal {
|
||
|
|
|
||
|
|
LockImpl::LockImpl() : native_handle_(SRWLOCK_INIT) {}
|
||
|
|
|
||
|
|
LockImpl::~LockImpl() = default;
|
||
|
|
|
||
|
|
bool LockImpl::Try() {
|
||
|
|
return !!::TryAcquireSRWLockExclusive(
|
||
|
|
reinterpret_cast<PSRWLOCK>(&native_handle_));
|
||
|
|
}
|
||
|
|
|
||
|
|
void LockImpl::Lock() {
|
||
|
|
// The ScopedLockAcquireActivity below is relatively expensive and so its
|
||
|
|
// actions can become significant due to the very large number of locks
|
||
|
|
// that tend to be used throughout the build. To avoid this cost in the
|
||
|
|
// vast majority of the calls, simply "try" the lock first and only do the
|
||
|
|
// (tracked) blocking call if that fails. Since "try" itself is a system
|
||
|
|
// call, and thus also somewhat expensive, don't bother with it unless
|
||
|
|
// tracking is actually enabled.
|
||
|
|
if (base::debug::GlobalActivityTracker::IsEnabled())
|
||
|
|
if (Try())
|
||
|
|
return;
|
||
|
|
|
||
|
|
base::debug::ScopedLockAcquireActivity lock_activity(this);
|
||
|
|
::AcquireSRWLockExclusive(reinterpret_cast<PSRWLOCK>(&native_handle_));
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace internal
|
||
|
|
} // namespace base
|