{

try

{

std::lock_guard<std::mutex> lock(_mutex);

_state = true;

if (_autoreset) _cond.notify_one();

else _cond.notify_all();

}

catch (std::system_error &e)

{

throw SystemException(e.what());

}

{

try

{

std::lock_guard<std::mutex> lock(_mutex);

_state = false;

}

catch (std::system_error &e)

{

throw SystemException(e.what());

}

{

try

{

std::unique_lock<std::mutex> lock(_mutex);

while (!_state)

_cond.wait(lock, [this]() { return this->_state.load(); });

if (_autoreset) _state = false;

}

catch (std::system_error &e)

{

throw SystemException(e.what());

}

{

try

{

std::unique_lock<std::mutex> lock(_mutex);

bool ret = _cond.wait_for(lock, std::chrono::milliseconds(milliseconds), [this]() { return this->_state.load(); });

if (ret && _autoreset) _state = false;

return ret;

}

catch (std::system_error &e)

{

throw SystemException(e.what());

}