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/*
Userspace Virtual Filesystem
Copyright (C) 2015 Sebastian Herbord. All rights reserved.
This file is part of usvfs.
usvfs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
usvfs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with usvfs. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hookcallcontext.h"
#include "hookcontext.h"
#include <logging.h>
namespace usvfs
{
class HookStack
{
public:
static HookStack& instance()
{
PreserveGetLastError boostChangesGetLastError;
if (s_Instance.get() == nullptr) {
s_Instance.reset(new HookStack());
}
return *s_Instance.get();
}
bool setGroup(MutExHookGroup group)
{
if (m_ActiveGroups.test(static_cast<size_t>(group)) ||
m_ActiveGroups.test(static_cast<size_t>(MutExHookGroup::ALL_GROUPS))) {
return false;
} else {
m_ActiveGroups.set(static_cast<size_t>(group), true);
return true;
}
}
void unsetGroup(MutExHookGroup group)
{
m_ActiveGroups.set(static_cast<size_t>(group), false);
}
private:
HookStack() {}
private:
static boost::thread_specific_ptr<HookStack> s_Instance;
std::bitset<static_cast<size_t>(MutExHookGroup::LAST)> m_ActiveGroups;
};
boost::thread_specific_ptr<HookStack> HookStack::s_Instance;
HookCallContext::HookCallContext() : m_Active(true), m_Group(MutExHookGroup::NO_GROUP)
{
updateLastError();
}
HookCallContext::HookCallContext(MutExHookGroup group)
: m_Active(HookStack::instance().setGroup(group)), m_Group(group)
{
updateLastError();
}
HookCallContext::~HookCallContext()
{
if (m_Active && (m_Group != MutExHookGroup::NO_GROUP)) {
HookStack::instance().unsetGroup(m_Group);
}
SetLastError(m_LastError);
}
void HookCallContext::restoreLastError()
{
SetLastError(m_LastError);
}
void HookCallContext::updateLastError(DWORD lastError)
{
m_LastError = lastError;
}
bool HookCallContext::active() const
{
return m_Active;
}
FunctionGroupLock::FunctionGroupLock(MutExHookGroup group) : m_Group(group)
{
m_Active = HookStack::instance().setGroup(m_Group);
}
FunctionGroupLock::~FunctionGroupLock()
{
if (m_Active) {
HookStack::instance().unsetGroup(m_Group);
}
}
} // namespace usvfs
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