/*****************************************************************************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 05/07/2008*****************************************************************************/#ifdef WIN32   #include <winsock2.h>   #include <ws2tcpip.h>   #include <wspiapi.h>#endif#include <cstring>#include "co-op.h"#include "core.h"using namespace std;bool CIPComp::operator()(const CHistoryBlock* hb1, const CHistoryBlock* hb2) const{   if (hb1->m_iIPversion != hb2->m_iIPversion)      return (hb1->m_iIPversion < hb2->m_iIPversion);   else if (hb1->m_iIPversion == AF_INET)      return (hb1->m_IP[0] > hb2->m_IP[0]);   else   {      for (int i = 0; i < 4; ++ i)      {         if (hb1->m_IP[i] != hb2->m_IP[i])            return (hb1->m_IP[i] > hb2->m_IP[i]);      }      return false;   }}bool CTSComp::operator()(const CHistoryBlock* hb1, const CHistoryBlock* hb2) const{   return (hb1->m_ullTimeStamp > hb2->m_ullTimeStamp);}CHistory::CHistory():m_uiSize(1024){   #ifndef WIN32      pthread_mutex_init(&m_Lock, NULL);   #else      m_Lock = CreateMutex(NULL, false, NULL);   #endif}CHistory::CHistory(const unsigned int& size):m_uiSize(size){   #ifndef WIN32      pthread_mutex_init(&m_Lock, NULL);   #else      m_Lock = CreateMutex(NULL, false, NULL);   #endif}CHistory::~CHistory(){   for (set<CHistoryBlock*, CTSComp>::iterator i = m_sTSIndex.begin(); i != m_sTSIndex.end(); ++ i)      delete *i;   #ifndef WIN32      pthread_mutex_destroy(&m_Lock);   #else      CloseHandle(m_Lock);   #endif}void CHistory::update(const sockaddr* addr, const int& ver, const int& rtt, const int& bw){   CGuard hbguard(m_Lock);   CHistoryBlock* hb = new CHistoryBlock;   convert(addr, ver, hb->m_IP);   hb->m_iIPversion = ver;   set<CHistoryBlock*, CIPComp>::iterator i = m_sIPIndex.find(hb);   if (i != m_sIPIndex.end())   {      m_sTSIndex.erase(*i);      delete *i;      m_sIPIndex.erase(i);   }   hb->m_iRTT = rtt;   hb->m_iBandwidth = bw;   hb->m_ullTimeStamp = CTimer::getTime();   m_sIPIndex.insert(hb);   m_sTSIndex.insert(hb);   if (m_sTSIndex.size() > m_uiSize)   {      hb = *m_sTSIndex.begin();      m_sIPIndex.erase(hb);      m_sTSIndex.erase(m_sTSIndex.begin());      delete hb;   }}void CHistory::update(const CHistoryBlock* info){   CGuard hbguard(m_Lock);   CHistoryBlock* hb = new CHistoryBlock;   memcpy((char*)hb, (char*)info, sizeof(CHistoryBlock));   set<CHistoryBlock*, CIPComp>::iterator i = m_sIPIndex.find(hb);   if (i != m_sIPIndex.end())   {      m_sTSIndex.erase(*i);      delete *i;      m_sIPIndex.erase(i);   }   hb->m_ullTimeStamp = CTimer::getTime();   m_sIPIndex.insert(hb);   m_sTSIndex.insert(hb);   if (m_sTSIndex.size() > m_uiSize)   {      hb = *m_sTSIndex.begin();      m_sIPIndex.erase(hb);      m_sTSIndex.erase(m_sTSIndex.begin());      delete hb;   }}int CHistory::lookup(const sockaddr* addr, const int& ver, CHistoryBlock* hb){   CGuard hbguard(m_Lock);   convert(addr, ver, hb->m_IP);   hb->m_iIPversion = ver;   set<CHistoryBlock*, CIPComp>::iterator i = m_sIPIndex.find(hb);   if (i == m_sIPIndex.end())      return -1;   hb->m_ullTimeStamp = (*i)->m_ullTimeStamp;   hb->m_iRTT = (*i)->m_iRTT;   hb->m_iBandwidth = (*i)->m_iBandwidth;   return 1;}void CHistory::convert(const sockaddr* addr, const int& ver, uint32_t* ip){   if (ver == AF_INET)   {      ip[0] = ((sockaddr_in*)addr)->sin_addr.s_addr;      ip[1] = ip[2] = ip[3] = 0;   }   else   {      memcpy((char*)ip, (char*)((sockaddr_in6*)addr)->sin6_addr.s6_addr, 16);   }}//bool CUDTComp::operator()(const CUDT* u1, const CUDT* u2) const{   return (u1->m_SocketID > u2->m_SocketID);}CControl::CControl(){   #ifndef WIN32      pthread_mutex_init(&m_Lock, NULL);   #else      m_Lock = CreateMutex(NULL, false, NULL);   #endif   m_pHistoryRecord = new CHistory;   }CControl::~CControl(){   #ifndef WIN32      pthread_mutex_destroy(&m_Lock);   #else      CloseHandle(m_Lock);   #endif   delete m_pHistoryRecord;}int CControl::join(CUDT* udt, const sockaddr* addr, const int& ver, int& rtt, int& bw){   CGuard ctrlguard(m_Lock);   CHistoryBlock* hb = new CHistoryBlock;   int found = m_pHistoryRecord->lookup(addr, ver, hb);   if (found > 0)   {      rtt = hb->m_iRTT;      bw = hb->m_iBandwidth;   }   map<CHistoryBlock*, set<CUDT*, CUDTComp>, CIPComp>::iterator i = m_mControlBlock.find(hb);   if (i == m_mControlBlock.end())   {      set<CUDT*, CUDTComp> tmp;      m_mControlBlock[hb] = tmp;      m_mControlBlock[hb].insert(udt);      m_mUDTIndex[udt] = hb;   }   else   {      i->second.insert(udt);      m_mUDTIndex[udt] = i->first;      delete hb;   }   if (found < 0)      return -1;   return 1;}void CControl::leave(CUDT* udt, const int& rtt, const int& bw){   CGuard ctrlguard(m_Lock);   CHistoryBlock* hb = m_mUDTIndex[udt];   map<CHistoryBlock*, set<CUDT*, CUDTComp>, CIPComp>::iterator i = m_mControlBlock.find(hb);   hb->m_iRTT = rtt;   hb->m_iBandwidth = bw;   m_pHistoryRecord->update(hb);   i->second.erase(udt);   if (i->second.empty())   {      m_mControlBlock.erase(i);      delete hb;   }   m_mUDTIndex.erase(udt);}