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/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2016 ZeroTier, Inc. https://www.zerotier.com/
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Constants.hpp"
#include "DeferredPackets.hpp"
#include "IncomingPacket.hpp"
#include "RuntimeEnvironment.hpp"
#include "Node.hpp"
namespace ZeroTier {
DeferredPackets::DeferredPackets(const RuntimeEnvironment *renv) :
RR(renv),
_readPtr(0),
_writePtr(0),
_waiting(0),
_die(false)
{
}
DeferredPackets::~DeferredPackets()
{
_q_m.lock();
_die = true;
while (_waiting > 0) {
_q_m.unlock();
_q_s.post();
_q_m.lock();
}
}
bool DeferredPackets::enqueue(IncomingPacket *pkt)
{
_q_m.lock();
const unsigned long p = _writePtr % ZT_DEFFEREDPACKETS_MAX;
if (_q[p]) {
_q_m.unlock();
return false;
} else {
_q[p].setToUnsafe(pkt);
++_writePtr;
_q_m.unlock();
_q_s.post();
return true;
}
}
int DeferredPackets::process()
{
SharedPtr<IncomingPacket> pkt;
_q_m.lock();
if (_die) {
_q_m.unlock();
return -1;
}
while (_readPtr == _writePtr) {
++_waiting;
_q_m.unlock();
_q_s.wait();
_q_m.lock();
--_waiting;
if (_die) {
_q_m.unlock();
return -1;
}
}
pkt.swap(_q[_readPtr++ % ZT_DEFFEREDPACKETS_MAX]);
_q_m.unlock();
pkt->tryDecode(RR,true);
return 1;
}
} // namespace ZeroTier
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