/*****************************************************************************Copyright (c) 2001 - 2008, The Board of Trustees of the University of Illinois.All rights reserved.Redistribution and use in source and binary forms, with or withoutmodification, are permitted provided that the following conditions aremet:* Redistributions of source code must retain the above  copyright notice, this list of conditions and the  following disclaimer.* Redistributions in binary form must reproduce the  above copyright notice, this list of conditions  and the following disclaimer in the documentation  and/or other materials provided with the distribution.* Neither the name of the University of Illinois  nor the names of its contributors may be used to  endorse or promote products derived from this  software without specific prior written permission.THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "ASIS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULARPURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER ORCONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, ORPROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OFLIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDINGNEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THISSOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*****************************************************************************//*****************************************************************************written by   Yunhong Gu, last updated 06/02/2008*****************************************************************************/#ifndef __UDT_QUEUE_H__#define __UDT_QUEUE_H__#include "common.h"#include "packet.h"#include "channel.h"#include <vector>#include <map>class CUDT;struct CUnit{   CPacket m_Packet;		// packet   int m_iFlag;			// 0: free, 1: occupied, 2: msg read but not freed (out-of-order), 3: msg dropped};class CUnitQueue{friend class CRcvQueue;friend class CRcvBuffer;public:   CUnitQueue();   ~CUnitQueue();public:      // Functionality:      //    Initialize the unit queue.      // Parameters:      //    1) [in] size: queue size      //    2) [in] mss: maximum segament size      //    3) [in] version: IP version      // Returned value:      //    0: success, -1: failure.   int init(const int& size, const int& mss, const int& version);      // Functionality:      //    Increase (double) the unit queue size.      // Parameters:      //    None.      // Returned value:      //    0: success, -1: failure.   int increase();      // Functionality:      //    Decrease (halve) the unit queue size.      // Parameters:      //    None.      // Returned value:      //    0: success, -1: failure.   int shrink();      // Functionality:      //    find an available unit for incoming packet.      // Parameters:      //    None.      // Returned value:      //    Pointer to the available unit, NULL if not found.   CUnit* getNextAvailUnit();private:   struct CQEntry   {      CUnit* m_pUnit;		// unit queue      char* m_pBuffer;		// data buffer      int m_iSize;		// size of each queue      CQEntry* m_pNext;   }   *m_pQEntry,			// pointer to the first unit queue   *m_pCurrQueue,		// pointer to the current available queue   *m_pLastQueue;		// pointer to the last unit queue   CUnit* m_pAvailUnit;         // recent available unit   int m_iSize;			// total size of the unit queue, in number of packets   int m_iCount;		// total number of valid packets in the queue   int m_iMSS;			// unit buffer size   int m_iIPversion;		// IP version};struct CSNode{   CUDT* m_pUDT;		// Pointer to the instance of CUDT socket   uint64_t m_llTimeStamp;      // Time Stamp   int m_iHeapLoc;		// location on the heap, -1 means not on the heap};class CSndUList{friend class CSndQueue;public:   CSndUList();   ~CSndUList();public:      // Functionality:      //    Insert a new UDT instance into the list.      // Parameters:      //    1) [in] ts: time stamp: next processing time      //    2) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void insert(const int64_t& ts, const CUDT* u);      // Functionality:      //    Update the timestamp of the UDT instance on the list.      // Parameters:      //    1) [in] u: pointer to the UDT instance      //    2) [in] resechedule: if the timestampe shoudl be rescheduled      // Returned value:      //    None.   void update(const CUDT* u, const bool& reschedule = true);      // Functionality:      //    Retrieve the next packet and peer address from the first entry, and reschedule it in the queue.      // Parameters:      //    0) [out] addr: destination address of the next packet      //    1) [out] pkt: the next packet to be sent      // Returned value:      //    1 if successfully retrieved, -1 if no packet found.   int pop(sockaddr*& addr, CPacket& pkt);      // Functionality:      //    Remove UDT instance from the list.      // Parameters:      //    1) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void remove(const CUDT* u);      // Functionality:      //    Retrieve the next scheduled processing time.      // Parameters:      //    None.      // Returned value:      //    Scheduled processing time of the first UDT socket in the list.   uint64_t getNextProcTime();private:   void insert_(const int64_t& ts, const CUDT* u);   void remove_(const CUDT* u);private:   CSNode** m_pHeap;			// The heap array   int m_iArrayLength;			// physical length of the array   int m_iLastEntry;			// position of last entry on the heap array   pthread_mutex_t m_ListLock;   pthread_mutex_t* m_pWindowLock;   pthread_cond_t* m_pWindowCond;   CTimer* m_pTimer;};struct CRNode{   CUDT* m_pUDT;                // Pointer to the instance of CUDT socket   uint64_t m_llTimeStamp;      // Time Stamp   CRNode* m_pPrev;             // previous link   CRNode* m_pNext;             // next link   bool m_bOnList;              // if the node is already on the list};class CRcvUList{public:   CRcvUList();   ~CRcvUList();public:      // Functionality:      //    Insert a new UDT instance to the list.      // Parameters:      //    1) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void insert(const CUDT* u);      // Functionality:      //    Remove the UDT instance from the list.      // Parameters:      //    1) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void remove(const CUDT* u);      // Functionality:      //    Move the UDT instance to the end of the list, if it already exists; otherwise, do nothing.      // Parameters:      //    1) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void update(const CUDT* u);public:   CRNode* m_pUList;		// the head nodeprivate:   CRNode* m_pLast;		// the last node};class CHash{public:   CHash();   ~CHash();public:      // Functionality:      //    Initialize the hash table.      // Parameters:      //    1) [in] size: hash table size      // Returned value:      //    None.   void init(const int& size);      // Functionality:      //    Look for a UDT instance from the hash table.      // Parameters:      //    1) [in] id: socket ID      // Returned value:      //    Pointer to a UDT instance, or NULL if not found.   CUDT* lookup(const int32_t& id);      // Functionality:      //    Insert an entry to the hash table.      // Parameters:      //    1) [in] id: socket ID      //    2) [in] u: pointer to the UDT instance      // Returned value:      //    None.   void insert(const int32_t& id, const CUDT* u);      // Functionality:      //    Remove an entry from the hash table.      // Parameters:      //    1) [in] id: socket ID      // Returned value:      //    None.   void remove(const int32_t& id);private:   struct CBucket   {      int32_t m_iID;		// Socket ID      CUDT* m_pUDT;		// Socket instance      CBucket* m_pNext;		// next bucket   } **m_pBucket;		// list of buckets (the hash table)   int m_iHashSize;		// size of hash table};class CRendezvousQueue{public:   CRendezvousQueue();   ~CRendezvousQueue();public:   void insert(const UDTSOCKET& id, const int& ipv, const sockaddr* addr);   void remove(const UDTSOCKET& id);   bool retrieve(const sockaddr* addr, UDTSOCKET& id);private:   struct CRL   {      UDTSOCKET m_iID;      int m_iIPversion;      sockaddr* m_pPeerAddr;   };   std::vector<CRL> m_vRendezvousID;         // The sockets currently in rendezvous mode   pthread_mutex_t m_RIDVectorLock;};class CSndQueue{friend class CUDT;friend class CUDTUnited;public:   CSndQueue();   ~CSndQueue();public:      // Functionality:      //    Initialize the sending queue.      // Parameters:      //    1) [in] c: UDP channel to be associated to the queue      //    2) [in] t: Timer      // Returned value:      //    None.   void init(const CChannel* c, const CTimer* t);      // Functionality:      //    Send out a packet to a given address.      // Parameters:      //    1) [in] addr: destination address      //    2) [in] packet: packet to be sent out      // Returned value:      //    Size of data sent out.   int sendto(const sockaddr* addr, CPacket& packet);private:#ifndef WIN32   static void* worker(void* param);#else   static DWORD WINAPI worker(LPVOID param);#endif   pthread_t m_WorkerThread;private:   CSndUList* m_pSndUList;		// List of UDT instances for data sending   CChannel* m_pChannel;                // The UDP channel for data sending   CTimer* m_pTimer;			// Timing facility   pthread_mutex_t m_WindowLock;   pthread_cond_t m_WindowCond;   volatile bool m_bClosing;		// closing the worker   pthread_cond_t m_ExitCond;};class CRcvQueue{friend class CUDT;friend class CUDTUnited;public:   CRcvQueue();   ~CRcvQueue();public:      // Functionality:      //    Initialize the receiving queue.      // Parameters:      //    1) [in] size: queue size      //    2) [in] mss: maximum packet size      //    3) [in] version: IP version      //    4) [in] hsize: hash table size      //    5) [in] c: UDP channel to be associated to the queue      //    6) [in] t: timer      // Returned value:      //    None.   void init(const int& size, const int& payload, const int& version, const int& hsize, const CChannel* c, const CTimer* t);      // Functionality:      //    Read a packet for a specific UDT socket id.      // Parameters:      //    1) [in] id: Socket ID      //    2) [out] packet: received packet      // Returned value:      //    Data size of the packet   int recvfrom(const int32_t& id, CPacket& packet);private:#ifndef WIN32   static void* worker(void* param);#else   static DWORD WINAPI worker(LPVOID param);#endif   pthread_t m_WorkerThread;private:   CUnitQueue m_UnitQueue;		// The received packet queue   CRcvUList* m_pRcvUList;		// List of UDT instances that will read packets from the queue   CHash* m_pHash;			// Hash table for UDT socket looking up   CChannel* m_pChannel;		// UDP channel for receving packets   CTimer* m_pTimer;			// shared timer with the snd queue   int m_iPayloadSize;                  // packet payload size   volatile bool m_bClosing;            // closing the workder   pthread_cond_t m_ExitCond;private:   int setListener(const CUDT* u);   void removeListener(const CUDT* u);   void setNewEntry(CUDT* u);   bool ifNewEntry();   CUDT* getNewEntry();   void storePkt(const int32_t& id, CPacket* pkt);private:   pthread_mutex_t m_LSLock;   volatile CUDT* m_pListener;			// pointer to the (unique, if any) listening UDT entity   CRendezvousQueue* m_pRendezvousQueue;	// The list of sockets in rendezvous mode   std::vector<CUDT*> m_vNewEntry;              // newly added entries, to be inserted   pthread_mutex_t m_IDLock;   std::map<int32_t, CPacket*> m_mBuffer;	// temporary buffer for rendezvous connection request   pthread_mutex_t m_PassLock;   pthread_cond_t m_PassCond;};class CMultiplexer{public:   CSndQueue* m_pSndQueue;	// The sending queue   CRcvQueue* m_pRcvQueue;	// The receiving queue   CChannel* m_pChannel;	// The UDP channel for sending and receiving   CTimer* m_pTimer;		// The timer   int m_iPort;			// The UDP port number of this multiplexer   int m_iIPversion;		// IP version   int m_iMSS;			// Maximum Segment Size   int m_iRefCount;		// number of UDT instances that are associated with this multiplexer   bool m_bReusable;		// if this one can be shared with others};#endif