queue.cpp

Last Update: Jan 22 2009 可靠UDP传输, 一套高效的基于windows平台的C++ 开发库

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/*****************************************************************************
written by
   Yunhong Gu, last updated 12/08/2008
*****************************************************************************/

#ifdef WIN32
   #include <winsock2.h>
   #include <ws2tcpip.h>
   #include <wspiapi.h>
#endif

#include <cstring>
#include "common.h"
#include "queue.h"
#include "core.h"

using namespace std;

CUnitQueue::CUnitQueue():
m_pQEntry(NULL),
m_pCurrQueue(NULL),
m_pLastQueue(NULL),
m_iSize(0),
m_iCount(0)
{
}

CUnitQueue::~CUnitQueue()
{
   CQEntry* p = m_pQEntry;

   while (p != NULL)
   {
      delete [] p->m_pUnit;
      delete [] p->m_pBuffer;

      CQEntry* q = p;
      if (p == m_pLastQueue)
         p = NULL;
      else
         p = p->m_pNext;
      delete q;
   }
}

int CUnitQueue::init(const int& size, const int& mss, const int& version)
{
   CQEntry* tempq = NULL;
   CUnit* tempu = NULL;
   char* tempb = NULL;

   try
   {
      tempq = new CQEntry;
      tempu = new CUnit [size];
      tempb = new char [size * mss];
   }
   catch (...)
   {
      delete tempq;
      delete [] tempu;
      delete [] tempb;

      return -1;
   }

   for (int i = 0; i < size; ++ i)
   {
      tempu[i].m_iFlag = 0;
      tempu[i].m_Packet.m_pcData = tempb + i * mss;
   }
   tempq->m_pUnit = tempu;
   tempq->m_pBuffer = tempb;
   tempq->m_iSize = size;

   m_pQEntry = m_pCurrQueue = m_pLastQueue = tempq;
   m_pQEntry->m_pNext = m_pQEntry;

   m_pAvailUnit = m_pCurrQueue->m_pUnit;

   m_iSize = size;
   m_iMSS = mss;
   m_iIPversion = version;

   return 0;
}

int CUnitQueue::increase()
{
   // adjust/correct m_iCount
   int real_count = 0;
   CQEntry* p = m_pQEntry;
   while (p != NULL)
   {
      CUnit* u = p->m_pUnit;
      for (CUnit* end = u + p->m_iSize; u != end; ++ u)
         if (u->m_iFlag != 0)
            ++ real_count;

      if (p == m_pLastQueue)
         p = NULL;
      else
         p = p->m_pNext;
   }
   m_iCount = real_count;
   if (double(m_iCount) / m_iSize < 0.9)
      return -1;

   CQEntry* tempq = NULL;
   CUnit* tempu = NULL;
   char* tempb = NULL;

   // all queues have the same size
   int size = m_pQEntry->m_iSize;

   try
   {
      tempq = new CQEntry;
      tempu = new CUnit [size];
      tempb = new char [size * m_iMSS];
   }
   catch (...)
   {
      delete tempq;
      delete [] tempu;
      delete [] tempb;

      return -1;
   }

   for (int i = 0; i < size; ++ i)
   {
      tempu[i].m_iFlag = 0;
      tempu[i].m_Packet.m_pcData = tempb + i * m_iMSS;
   }
   tempq->m_pUnit = tempu;
   tempq->m_pBuffer = tempb;
   tempq->m_iSize = size;

   m_pLastQueue->m_pNext = tempq;
   m_pLastQueue = tempq;
   m_pLastQueue->m_pNext = m_pQEntry;

   m_iSize += size;

   return 0;
}

int CUnitQueue::shrink()
{
   // currently queue cannot be shrunk.
   return -1;
}

CUnit* CUnitQueue::getNextAvailUnit()
{
   if (m_iCount * 10 > m_iSize * 9)
      increase();

   if (m_iCount >= m_iSize)
      return NULL;

   CQEntry* entrance = m_pCurrQueue;

   do
   {
      for (CUnit* sentinel = m_pCurrQueue->m_pUnit + m_pCurrQueue->m_iSize - 1; m_pAvailUnit != sentinel; ++ m_pAvailUnit)
         if (m_pAvailUnit->m_iFlag == 0)
            return m_pAvailUnit;

      if (m_pCurrQueue->m_pUnit->m_iFlag == 0)
      {
         m_pAvailUnit = m_pCurrQueue->m_pUnit;
         return m_pAvailUnit;
      }

      m_pCurrQueue = m_pCurrQueue->m_pNext;
      m_pAvailUnit = m_pCurrQueue->m_pUnit;
   } while (m_pCurrQueue != entrance);

   increase();

   return NULL;
}


CSndUList::CSndUList()
{
   m_iArrayLength = 4096;
   m_pHeap = new CSNode*[m_iArrayLength];
   m_iLastEntry = -1;

   #ifndef WIN32
      pthread_mutex_init(&m_ListLock, NULL);
   #else
      m_ListLock = CreateMutex(NULL, false, NULL);
   #endif
}

CSndUList::~CSndUList()
{
   delete [] m_pHeap;

   #ifndef WIN32
      pthread_mutex_destroy(&m_ListLock);
   #else
      CloseHandle(m_ListLock);
   #endif
}

void CSndUList::insert(const int64_t& ts, const CUDT* u)
{
   CGuard listguard(m_ListLock);

   // increase the heap array size if necessary
   if (m_iLastEntry == m_iArrayLength - 1)
   {
      CSNode** temp = NULL;

      try
      {
         temp = new CSNode*[m_iArrayLength * 2];
      }
      catch(...)
      {
         return;
      }

      memcpy(temp, m_pHeap, sizeof(CSNode*) * m_iArrayLength);
      m_iArrayLength *= 2;
      delete [] m_pHeap;
      m_pHeap = temp;
   }

   insert_(ts, u);
}

void CSndUList::update(const CUDT* u, const bool& reschedule)
{
   CGuard listguard(m_ListLock);

   CSNode* n = u->m_pSNode;

   if (n->m_iHeapLoc >= 0)
   {
      if (!reschedule)
         return;

      if (n->m_iHeapLoc == 0)
      {
         n->m_llTimeStamp = 1;
         m_pTimer->interrupt();
         return;
      }

      remove_(u);
   }

   insert_(1, u);
}

int CSndUList::pop(sockaddr*& addr, CPacket& pkt)
{
   CGuard listguard(m_ListLock);

   if (-1 == m_iLastEntry)
      return -1;

   CUDT* u = m_pHeap[0]->m_pUDT;
   remove_(u);

   if (!u->m_bConnected || u->m_bBroken)
      return -1;

   // pack a packet from the socket
   uint64_t ts;
   if (u->packData(pkt, ts) <= 0)
      return -1;

   addr = u->m_pPeerAddr;

   // insert a new entry, ts is the next processing time
   if (ts > 0)
      insert_(ts, u);

   return 1;
}

void CSndUList::remove(const CUDT* u)
{
   CGuard listguard(m_ListLock);

   remove_(u);
}

uint64_t CSndUList::getNextProcTime()
{
   CGuard listguard(m_ListLock);

   if (-1 == m_iLastEntry)
      return 0;

   return m_pHeap[0]->m_llTimeStamp;
}

void CSndUList::insert_(const int64_t& ts, const CUDT* u)
{
   CSNode* n = u->m_pSNode;

   // do not insert repeated node
   if (n->m_iHeapLoc >= 0)
      return;

   m_iLastEntry ++;
   m_pHeap[m_iLastEntry] = n;
   n->m_llTimeStamp = ts;

   int q = m_iLastEntry;
   int p = q;
   while (p != 0)
   {
      p = (q - 1) >> 1;
      if (m_pHeap[p]->m_llTimeStamp > m_pHeap[q]->m_llTimeStamp)
      {
         CSNode* t = m_pHeap[p];
         m_pHeap[p] = m_pHeap[q];
         m_pHeap[q] = t;
         t->m_iHeapLoc = q;
         q = p;
      }
      else
         break;
   }

   n->m_iHeapLoc = q;

   // first entry, activate the sending queue
   if (0 == m_iLastEntry)
   {
      #ifndef WIN32
         pthread_mutex_lock(m_pWindowLock);
         pthread_cond_signal(m_pWindowCond);
         pthread_mutex_unlock(m_pWindowLock);
      #else
         SetEvent(*m_pWindowCond);
      #endif
   }
}

void CSndUList::remove_(const CUDT* u)
{
   CSNode* n = u->m_pSNode;

   if (n->m_iHeapLoc >= 0)
   {
      // remove the node from heap
      m_pHeap[n->m_iHeapLoc] = m_pHeap[m_iLastEntry];
      m_iLastEntry --;
      m_pHeap[n->m_iHeapLoc]->m_iHeapLoc = n->m_iHeapLoc;

      int q = n->m_iHeapLoc;
      int p = q * 2 + 1;
      while (p <= m_iLastEntry)
      {
         if ((p + 1 <= m_iLastEntry) && (m_pHeap[p]->m_llTimeStamp > m_pHeap[p + 1]->m_llTimeStamp))
            p ++;

         if (m_pHeap[q]->m_llTimeStamp > m_pHeap[p]->m_llTimeStamp)
         {
            CSNode* t = m_pHeap[p];
            m_pHeap[p] = m_pHeap[q];
            m_pHeap[p]->m_iHeapLoc = p;
            m_pHeap[q] = t;
            m_pHeap[q]->m_iHeapLoc = q;

            q = p;
            p = q * 2 + 1;
         }
         else
            break;
      }

      n->m_iHeapLoc = -1;
   }
}

//
CSndQueue::CSndQueue():
m_pSndUList(NULL),
m_pChannel(NULL),
m_pTimer(NULL),
m_bClosing(false)
{
   #ifndef WIN32
      pthread_cond_init(&m_WindowCond, NULL);
      pthread_mutex_init(&m_WindowLock, NULL);
   #else
      m_WindowLock = CreateMutex(NULL, false, NULL);
      m_WindowCond = CreateEvent(NULL, false, false, NULL);
      m_ExitCond = CreateEvent(NULL, false, false, NULL);
   #endif
}

CSndQueue::~CSndQueue()
{
   m_bClosing = true;

   #ifndef WIN32
      pthread_mutex_lock(&m_WindowLock);
      pthread_cond_signal(&m_WindowCond);
      pthread_mutex_unlock(&m_WindowLock);
      if (0 != m_WorkerThread)
         pthread_join(m_WorkerThread, NULL);
      pthread_cond_destroy(&m_WindowCond);
      pthread_mutex_destroy(&m_WindowLock);
   #else
      SetEvent(m_WindowCond);
      if (NULL != m_WorkerThread)
         WaitForSingleObject(m_ExitCond, INFINITE);
      CloseHandle(m_WorkerThread);
      CloseHandle(m_WindowLock);
      CloseHandle(m_WindowCond);
   #endif

   delete m_pSndUList;
}

void CSndQueue::init(const CChannel* c, const CTimer* t)
{
   m_pChannel = (CChannel*)c;
   m_pTimer = (CTimer*)t;
   m_pSndUList = new CSndUList;
   m_pSndUList->m_pWindowLock = &m_WindowLock;
   m_pSndUList->m_pWindowCond = &m_WindowCond;
   m_pSndUList->m_pTimer = m_pTimer;

   #ifndef WIN32
      if (0 != pthread_create(&m_WorkerThread, NULL, CSndQueue::worker, this))
      {
         m_WorkerThread = 0;
         throw CUDTException(3, 1);
      }
   #else
      DWORD threadID;
      m_WorkerThread = CreateThread(NULL, 0, CSndQueue::worker, this, 0, &threadID);
      if (NULL == m_WorkerThread)
         throw CUDTException(3, 1);
   #endif
}

#ifndef WIN32
   void* CSndQueue::worker(void* param)
#else
   DWORD WINAPI CSndQueue::worker(LPVOID param)
#endif
{
   CSndQueue* self = (CSndQueue*)param;

   CPacket pkt;

   while (!self->m_bClosing)
   {
      uint64_t ts = self->m_pSndUList->getNextProcTime();

      if (ts > 0)
      {
         // wait until next processing time of the first socket on the list
         uint64_t currtime;
         CTimer::rdtsc(currtime);
         if (currtime < ts)
            self->m_pTimer->sleepto(ts);

         // it is time to process it, pop it out/remove from the list
         sockaddr* addr;
         CPacket pkt;
         if (self->m_pSndUList->pop(addr, pkt) < 0)
            continue;

         self->m_pChannel->sendto(addr, pkt);
      }
      else
      {
         // wait here if there is no sockets with data to be sent
         #ifndef WIN32
            pthread_mutex_lock(&self->m_WindowLock);
            if (!self->m_bClosing && (self->m_pSndUList->m_iLastEntry < 0))
               pthread_cond_wait(&self->m_WindowCond, &self->m_WindowLock);
            pthread_mutex_unlock(&self->m_WindowLock);
         #else
            WaitForSingleObject(self->m_WindowCond, INFINITE);
         #endif
      }
   }

   #ifndef WIN32
      return NULL;
   #else
      SetEvent(self->m_ExitCond);
      return 0;
   #endif
}

int CSndQueue::sendto(const sockaddr* addr, CPacket& packet)
{
   // send out the packet immediately (high priority), this is a control packet
   m_pChannel->sendto(addr, packet);

   return packet.getLength();
}


//
CRcvUList::CRcvUList():
m_pUList(NULL),
m_pLast(NULL)
{
}

CRcvUList::~CRcvUList()
{
}

void CRcvUList::insert(const CUDT* u)
{
   CRNode* n = u->m_pRNode;
   CTimer::rdtsc(n->m_llTimeStamp);

   n->m_bOnList = true;

   if (NULL == m_pUList)
   {
      // empty list, insert as the single node