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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// Interruptible sleep
#ifndef OPENVPN_COMMON_ASYNCSLEEP_H
#define OPENVPN_COMMON_ASYNCSLEEP_H
#include <algorithm>
#include <openvpn/common/stop.hpp>
#include <openvpn/common/sleep.hpp>
namespace openvpn {
// returns false if Stop signal prevented full wait
inline bool async_sleep_milliseconds(int milliseconds, Stop *async_stop)
{
const int milliseconds_per_retry = 250;
volatile bool stop = false;
// allow asynchronous stop
Stop::Scope stop_scope(async_stop, [&stop]()
{ stop = true; });
while (milliseconds > 0 && !stop)
{
const int ms = std::min(milliseconds, milliseconds_per_retry);
sleep_milliseconds(ms);
milliseconds -= ms;
}
return !stop;
}
} // namespace openvpn
#endif
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