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99 lines
2.8 KiB
99 lines
2.8 KiB
/* |
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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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volatile int _waiting; |
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volatile 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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