source: Sophya/trunk/ArchTOIPipe/Kernel/ringpipe.cc@ 3187

// ArchTOIPipe           (C)     CEA/DAPNIA/SPP IN2P3/LAL
//                               Eric Aubourg
//                               Christophe Magneville
//                               Reza Ansari
// $Id: ringpipe.cc,v 1.2 2003-05-20 10:10:08 aubourg Exp $

#include "ringpipe.h"
#include "ringprocessor.h"


#ifdef WITH_SOPHYA
#include "pexceptions.h"
#else
#include "apexceptions.h"
#endif

RingPipe::RingPipe(int ws) {
  i0 = -1;
  winSize = ws;
  producer = NULL;
  pthread_cond_init(&ringReady, NULL);
  pthread_mutexattr_init(&mutattr);
  pthread_mutex_init(&mutex, &mutattr);
}

RingPipe::~RingPipe() {
  pthread_mutex_destroy(&mutex);
  pthread_cond_destroy(&ringReady);
}

Ring const* RingPipe::getRing(int i) {
  lock();
  waitForRing(i);
  Ring const* ring =  data[i-i0];
  unlock();
  return ring;
}

void RingPipe::putRing(int i, Ring const* ring) {
  lock();
  waitForRoom(i);
  if (i0 == -1) {
    data.insert(data.begin(), 1, (Ring const*) NULL);
    i0 = i;
  } else if (i<i0) {
    data.insert(data.begin(), i0-i, (Ring const*) NULL); 
    i0 = i;
  } else if (i>=i0+(int)data.size()) {
    data.insert(data.end(), (long)  (i-(i0+data.size())+1),  (Ring const*)NULL);
  }
  data[i-i0] = ring;
  notify();
  unlock();
}

void RingPipe::waitForRoom(int j) {
  while (j-i0 >= winSize) {
    wait();
  }
}

void RingPipe::waitForRing(int i) {
  if (producer == NULL) throw NotFoundExc("RingPipe has no producer !");
  
  DataStatus s = isRingAvail(i);
  if (s == DATA_OK) {
    return;
  }
  if (s == DATA_DELETED) {
    throw NotFoundExc("Data has been deleted !");
  }

  while (isRingAvail(i) == DATA_NOT_YET) {
    wait();
  }
  return;
}

void RingPipe::getRingRange(int& min, int& max) {
  producer->getRingRange(min, max);
}

RingPipe::DataStatus RingPipe::isRingAvail(int i) {
  if (i >= i0 + (long)data.size()) return DATA_NOT_YET;
  if (i < i0) return DATA_DELETED;
  return DATA_OK;
}

void RingPipe::wontNeedRingBefore(int i) {
  int j=i;
  for (vector<RingProcessor*>::iterator k = consumers.begin();
       k != consumers.end(); k++) {
    if ((*k)->getWontNeedBefore() < j) j = (*k)->getWontNeedBefore();
  }
  lock();
  if (i >= i0 + (long)data.size())
    i = i0 + (long)data.size() -1;
  if (i > i0) {
    data.erase(data.begin(), data.begin()+(i-i0));
    i0=i;
    notify();
  }
  unlock();
}

void RingPipe::addConsumer(RingProcessor* cons) {
  consumers.push_back(cons);
}

void RingPipe::setProducer(RingProcessor* proc) {
  if (producer) 
    throw DuplicateIdExc("RingPipe::setProducer : producer already defined");
  producer = proc;
}