mirror of
https://github.com/zerotier/ZeroTierOne.git
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99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
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/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2015 ZeroTier, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#ifndef ZT_DEFERREDPACKETS_HPP
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#define ZT_DEFERREDPACKETS_HPP
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#include "Constants.hpp"
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#include "SharedPtr.hpp"
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#include "Mutex.hpp"
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#include "DeferredPackets.hpp"
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#include "BinarySemaphore.hpp"
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/**
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* Maximum number of deferred packets
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*/
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#define ZT_DEFFEREDPACKETS_MAX 1024
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namespace ZeroTier {
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class IncomingPacket;
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class RuntimeEnvironment;
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/**
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* Deferred packets
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*
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* IncomingPacket can defer its decoding this way by enqueueing itself here.
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* When this is done, deferredDecode() is called later. This is done for
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* operations that may be expensive to allow them to potentially be handled
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* in the background or rate limited to maintain quality of service for more
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* routine operations.
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*/
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class DeferredPackets
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{
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public:
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DeferredPackets(const RuntimeEnvironment *renv);
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~DeferredPackets();
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/**
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* Enqueue a packet
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*
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* Since packets enqueue themselves, they call it with 'this' and we wrap
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* them in a SharedPtr<>. This is safe as SharedPtr<> is introspective and
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* supports this. This should not be called from any other code outside
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* IncomingPacket.
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*
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* @param pkt Packet to process later (possibly in the background)
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* @return False if queue is full
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*/
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bool enqueue(IncomingPacket *pkt);
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/**
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* Wait for and then process a deferred packet
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*
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* If we are shutting down (in destructor), this returns -1 and should
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* not be called again. Otherwise it returns the number of packets
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* processed.
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*
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* @return Number processed or -1 if shutting down
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*/
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int process();
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private:
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SharedPtr<IncomingPacket> _q[ZT_DEFFEREDPACKETS_MAX];
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const RuntimeEnvironment *const RR;
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unsigned long _readPtr;
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unsigned long _writePtr;
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bool _die;
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Mutex _q_m;
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BinarySemaphore _q_s;
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};
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} // namespace ZeroTier
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#endif
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