---

CExperiment.cpp

Go to the documentation of this file.

/*
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

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*/
static const char* Copyright = "(C) Copyright Michigan State University 2002, All rights reserved";
/*
   $Header: /usr/TruCluster/users/daqcvs/repository/NewClients/Readout/CExperiment.cpp,v 1.6 2002/10/22 12:38:16 fox Exp $
   
   Modification History:
   $Log: CExperiment.cpp,v $
// Revision 1.6  2002/10/22  12:38:16  fox
// Straighten out dates in internal copyright notices.
//
// Revision 1.5  2002/10/16  16:16:09  fox
// Add events and words status consts: Number of events acquired and number of
// words acquired in current run.
//
// Revision 1.4  2002/10/16  14:22:21  fox
// Change some runvars into consts:
// - state -- the run state is now a const maintained by the program.
// - starttime - the time at which the run started.
//
// Link in libraries from . before $(INSTDIR)
//
// Revision 1.3  2002/10/15  12:48:23  fox
// 1. Initial testing
// 2. Add const variable and make tkloaded const.
// 3. Add TclServer functionality.
//
// Revision 1.2  2002/10/09  11:22:25  fox
// Stamp with copyright/gpl license notice
//
   */
   
#include "CExperiment.h"                  
#include "CStateTransitionCommand.h"
#include "CBeginCommand.h"
#include "CEndCommand.h"
#include "CReadoutMain.h"
#include "CDuplicateSingleton.h"
#include "CNoSuchObjectException.h"
#include "CApplicationSerializer.h"
#include "CNSCLPhysicsBuffer.h"
#include "CNSCLScalerBuffer.h"
#include "CNSCLControlBuffer.h"
#include "CStateTransitionCommand.h"
#include "CRunVariableBuffer.h"
#include "CStateVariableBuffer.h"
#include "CNSCLDocumentationBuffer.h"
#include "CDocumentedPacketManager.h"
#include "CDocumentedPacket.h"
#include "CInterpreterCore.h"
#include "CInterpreterShell.h"


#include "CTimer.h"
#include "CScalerTrigger.h"


#include "CRunVariableCommand.h"
#include "CRunVariable.h"

#include "CStateVariableCommand.h"
#include "CStateVariable.h"

#include "buftypes.h"
#include "buffer.h"

#include <spectrodaq.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <typeinfo>
#include <iostream.h>
#include <algorithm>
#include <tcl.h>

extern CReadoutMain MyApp;


static const unsigned int nTriggerDwellTime = 100; 
static const unsigned int nTriggersPerPoll  =  10; 
                                                   // checks.
static const unsigned int msPerClockTick = 100;   
                                                   // ticks.
static const unsigned int SECOND     = 1000000;    
static const unsigned int MILISECOND = 1000; 


class CTriggerThread : public DAQThread
{
  CExperiment* m_pExperiment;   
  CTrigger*    m_pTrigger;      
  bool         m_Exiting;       
  DAQThreadId    m_Id;          
  unsigned int m_msHoldTime;    
  unsigned int m_nTriggerdwell; 
public:
  CTriggerThread(CExperiment* pExp, CTrigger* pTrig);

  void Start();                 // Start execution.
  void Stop();                  // Stop execution.
protected:
  virtual int operator()(int argc, char** argv);
  virtual void MainLoop();

};
CTriggerThread::CTriggerThread(CExperiment* pExp, CTrigger* pTrig) :
  m_pExperiment(pExp),
  m_pTrigger(pTrig),
  m_Exiting(false),
  m_msHoldTime(nTriggerDwellTime),
  m_nTriggerdwell(nTriggersPerPoll)
{}
void
CTriggerThread::Start()
{
  m_Exiting = false;
  m_Id = daq_dispatcher.Dispatch(*this, 0, 0);
}
void
CTriggerThread::Stop()
{
  if(m_Exiting) return; // Already exiting or done.

  DAQThreadId id( m_Id);
  m_Exiting = true;

  // We have the mutex, we need to release it so the triger thread
  // can get it to run... we'll re-acquire after the join at the same level.
  //
  CApplicationSerializer& mutex(*(CApplicationSerializer::getInstance()));

  unsigned nLockLevel = mutex.getLockLevel();
  mutex.UnLockCompletely();

  Join(m_Id);                   // Wait for trigger to exit.

  for(unsigned i =0; i < nLockLevel; i++) {
    mutex.Lock();
  }
}
//
int
CTriggerThread::operator()(int argc, char** argv)
{
  MainLoop();
  return 0;
}

void
CTriggerThread::MainLoop()
{
  while(!m_Exiting) {
    struct timeval mutexstart;
    struct timeval mutexend;
    struct timezone tz;         // Unused but required for gettimeofday(2).
    int dwell;
    //
    // Lock the mutex and process triggers for the dwell time.
    // The trigger is checked several times to amortize gettimeofday().
    //
    gettimeofday(&mutexstart, &tz);
    CApplicationSerializer::getInstance()->Lock();
    do {
      for(int i = 0; i < 500; i++) {
        int triggers=0;
        if((*m_pTrigger)()) {   // Read an event...
          m_pExperiment->ReadEvent();
          if((triggers++) >= m_nTriggerdwell) break; // Check elapsed time.
        }
      }
      // If we've held the mutex for longer than m_msHoldTime,
      // release the mutex so that other threads get a chance to run.
      //
      gettimeofday(&mutexend, &tz);
      int secdif = mutexend.tv_sec - mutexstart.tv_sec;
      mutexend.tv_usec += SECOND*secdif;
      dwell = (mutexend.tv_usec - mutexstart.tv_usec)/MILISECOND;
    } while(dwell < m_msHoldTime);
    CApplicationSerializer::getInstance()->UnLock();
  }
}



CExperiment::CExperiment (unsigned nBufferSize = 4096) :
  m_EventBuffer(0),             // Spectrodaq might not be up yet.
  m_nBufferSize(nBufferSize),
  m_pStatusModule(0),
  m_pTrigger(0),
  m_pTThread(0),
  m_LastSnapTime(0),
  m_LastScalerTime(0),
  m_nEventsAcquired(0),
  m_nWordsAcquired(0)
{
  SetupTimedEvent();
}
CExperiment::CExperiment(CTrigger*      pTriggerModule,
                         CEventSegment* pEventReadout,
                         CScaler*       pScalers,
                         CStatusModule* pStatus,
                         unsigned       nBufferSize) :
  m_EventBuffer(0),             // Spectrodaq may  not be booted yet.
  m_nBufferSize(nBufferSize*2),
  m_pStatusModule(pStatus),
  m_pTrigger(pTriggerModule),
  m_pTThread(0),
  m_LastSnapTime(0),
  m_LastScalerTime(0),
  m_nEventsAcquired(0),
  m_nWordsAcquired(0)
{
  if(pScalers) m_Scalers.AddScalerModule(pScalers);
  m_EventReadout.AddSegment(pEventReadout);
  SetupTimedEvent();
}

// Functions for class CExperiment

void 
CExperiment::Start(CStateTransitionCommand& rCommand)  
{
  // Execute pre-actions:
 
  rCommand.ExecutePreFunction();

  // Figure out what kind of buffer to emit and emit it.

  try {
    CBeginCommand& rBegin(dynamic_cast<CBeginCommand&>(rCommand)); // Throws if resume.
    MyApp.getClock().Reset();   // Reset the run elapsed time.
    EmitStart();                // and emit a begin buffer.
    m_LastScalerTime = 0;       // Neither scalers have been readout yet this run.
    m_LastSnapTime   = 0;

    // Set the starttime variable:

    CInterpreterShell* pShell = CReadoutMain::getInstance()->getInterpreter();
    CInterpreterCore*  pCore  = pShell->getInterpreterCore();
    time_t epochTime = time(NULL);
    string sTime(ctime(&epochTime));
    pCore->setStartTime(sTime);
          
    // Reset the statistical counters:
          
   m_nEventsAcquired = 0;
   m_nWordsAcquired  = 0;
     
   pCore->setEvents(m_nEventsAcquired);
   pCore->setWords(m_nWordsAcquired);
    
  }
  catch (bad_cast& rbad) {
    m_LastScalerTime = 0;       // Snaps will not have been read out at resume.
    EmitResume();               // Emit a resume without zeroing the run elapsed time.
  }

  // Emit documentation and runstate variable buffers.

  TriggerDocBuffer();
  TriggerRunVariableBuffer();
  TriggerStateVariableBuffer();

  // Prepare the hardware for readout:

  m_Scalers.Clear();
  m_EventReadout.Initialize();  // Initialize the event readout...
  m_EventReadout.Clear();       // Clear digitizers prior to start.

  // Start the trigger process and clock.

  StartTrigger();
  m_pScalerTrigger->SetInterval(MyApp.getScalerPeriod() * 1000);
  MyApp.getClock().Start(msPerClockTick, nTriggerDwellTime);




  //<----------- At this point we can potentially take data.
  // Execute post-actions:

  rCommand.ExecutePostFunction();
}  

void 
CExperiment::Stop(CStateTransitionCommand& rCommand)  
{
  // Do the pre actions.

  rCommand.ExecutePreFunction();


  // Emit documentation and variable list buffers.

  TriggerDocBuffer();
  TriggerRunVariableBuffer();
  TriggerStateVariableBuffer();  

  // Stop the trigger and clock processes.  Note that the stop trigger function
  // synchronizes with the exit of the trigger thread.
  
  StopTrigger();                //<--------- At this point we can't take data.
  TriggerScalerReadout();       // Closing scaler buffers.

  // Figure out what kind of event this is and emit the appropriate buffer
  //  (End or Pause).

  try {
    CEndCommand& rend(dynamic_cast<CEndCommand&>( rCommand));
    EmitEnd();
  }
  catch (bad_cast& rbad) {
    EmitPause();
  }

  // Do the post actions.

  MyApp.getClock().Stop();
  rCommand.ExecutePostFunction();
}  

void 
CExperiment::ReadEvent()  
{

  // For sure spectrodaq is booted and the event buffer can be created
  // at this time.
  //
  if(!m_EventBuffer) {
    m_EventBuffer = new CNSCLPhysicsBuffer(m_nBufferSize * 2);
  }
  
  DAQWordBufferPtr ptr(m_EventBuffer->StartEvent());
  DAQWordBufferPtr hdr = ptr;
   
  ptr = m_EventReadout.Read(ptr);
  m_EventReadout.Clear();
  PostEvent();

  m_nEventsAcquired++;
  m_nWordsAcquired += ptr.GetIndex() - hdr.GetIndex();
  if(ptr.GetIndex() > m_nBufferSize) {
     
     Overflow(hdr, ptr);
     
     // Update the Tcl statistic vars:
     
     CInterpreterShell* pShell = 
                CReadoutMain::getInstance()->getInterpreter();
     CInterpreterCore*  pCore  = pShell->getInterpreterCore();
     pCore->setEvents(m_nEventsAcquired);
     pCore->setWords(m_nWordsAcquired);
 
     
  } else {
     m_EventBuffer->EndEvent(ptr);
  }

  if(!m_EventBuffer->EntityFits(m_EventReadout.size())) {
    m_EventBuffer->SetRun(GetRunNumber());
    m_EventBuffer->Route();
  }
}  

void 
CExperiment::PostEvent()  
{
  
  // 
  // Clear the busy 

  ClearBusy();

}  

void 
CExperiment::AddEventSegment(CEventSegment* rSegment)  
{
  m_EventReadout.AddSegment(rSegment);
}  

void 
CExperiment::RemoveEventSegment(CEventSegment* pSegment)  
{
  m_EventReadout.DeleteSegment(pSegment); // Throws the exception for us.
}  

void 
CExperiment::SetBusy()  
{
  m_pStatusModule->GoBusy();
}  

void 
CExperiment::ClearBusy()  
{
  m_pStatusModule->ModuleClear();
  m_pStatusModule->GoClear();
}  

void 
CExperiment::EstablishTrigger(CTrigger* pTrigger)  
{
  m_pTrigger = pTrigger;
}  



void 
CExperiment::EstablishBusy(CStatusModule* pStatus)  
{
  m_pStatusModule = pStatus;
}  

void 
CExperiment::TriggerScalerReadout()  
{

  // If there is an event data buffer with events in it
  // commit it:

  if(m_EventBuffer) {
    
    if(m_EventBuffer->getEntityCount()) {
      m_EventBuffer->SetRun(GetRunNumber());
      m_EventBuffer->Route();
    }
  }

  //
  vector<unsigned long> scalers = m_Scalers.Read();
  m_Scalers.Clear();
  CNSCLScalerBuffer buffer(m_nBufferSize);

  // If a snapshot scaler has been readout, the values
  // just read must be added to their sums.
  //
  if((!m_IntervalSums.empty()) && (m_LastSnapTime != 0)) {
    int nelements = (scalers.size() <= m_IntervalSums.size()) ? scalers.size() : 
                                                                m_IntervalSums.size();
    for(int i =0; i < nelements; i++) {
      scalers[i] += m_IntervalSums[i];
      m_IntervalSums[i] = 0;
    }
  }
  // Format the buffer and adjust the times:
  //

  buffer.PutScalerVector(scalers);
  buffer.SetStartTime(m_LastScalerTime);
  buffer.SetEndTime(m_LastScalerTime = GetElapsedTime());
  buffer.SetRun(GetRunNumber());
  buffer.Route(false);          // No sequence increment for scalers.

  m_LastSnapTime = 0;
  m_LastScalerTime = GetElapsedTime();

 
}  

void 
CExperiment::TriggerRunVariableBuffer()  
{
  CRunVariableCommand* 
    Vars(MyApp.getInterpreter()->getInterpreterCore()->getRunVariables());
  
  RunVariableIterator i = Vars->begin();

  //
  // Multiple buffers may be required:

  while(i != Vars->end()) {
    CRunVariableBuffer buf;
    i = EmitRunVariableBuffer(buf, i, Vars->end());
    buf.SetRun(GetRunNumber());
    buf.Route(false);           // No sequenc increment for run variable buffers.
  }
  
}  
void
CExperiment::TriggerStateVariableBuffer()
{
  CStateVariableCommand* 
    Vars(MyApp.getInterpreter()->getInterpreterCore()->getStateVariables());
  StateVariableIterator  i = Vars->begin();
  StateVariableIterator  e = Vars->end();
  // Multiple buffers may be required:
  
  while(i != Vars->end()) {
    CStateVariableBuffer buf(m_nBufferSize);
    i = EmitStateVariableBuffer(buf, i, e);
    buf.SetRun(GetRunNumber());
    buf.Route(false);           // No sequenc increment for run variable buffers.
  }

}
void 
CExperiment::TriggerSnapshotScaler()  
{
  
  CNSCLScalerBuffer buffer(m_nBufferSize);
  vector<unsigned long> scalers = m_Scalers.Read();
  m_Scalers.Clear();
  
  // Sum the scalers into the snapshot scaler totals vector.
  // If necessary, the scaler vector is extended.

  for(int i = 0; i < scalers.size(); i++) {
    if(i < m_IntervalSums.size()) {
      m_IntervalSums[i] += scalers[i];
    }
    else {
      m_IntervalSums.push_back(scalers[i]);
    }
  }
  // Now emit the scaler buffer, and adjust the times:

  buffer.PutScalerVector(scalers);
  buffer.SetType(SNAPSCBF);
  buffer.SetStartTime(m_LastSnapTime);
  buffer.SetEndTime(m_LastSnapTime = GetElapsedTime());

  buffer.SetRun(GetRunNumber());
  buffer.Route(false);
                     
}  

void 
CExperiment::TriggerDocBuffer()  
{
  CDocumentedPacketManager* pManager = CDocumentedPacketManager::getInstance();
  DocumentationPacketIterator  i = pManager->begin();
  while(i != pManager->end()) {
    CNSCLDocumentationBuffer buf(m_nBufferSize);

    i = EmitDocBuffer(i, pManager->end(), buf);
    buf.SetRun(GetRunNumber());
    buf.Route(false);
  }
  
}  

void 
CExperiment::AddScalerModule(CScaler* pScaler)  
{
  m_Scalers.AddScalerModule(pScaler);
}  

void 
CExperiment::RemoveScalerModule(CScaler* pScaler)  
{
  m_Scalers.DeleteScalerModule(pScaler);
}

void
CExperiment::EmitStart()
{
  CNSCLOutputBuffer::ClearSequence(); // Begin run always has zero for sequence number.

  // Need a bunch of stuff:
  // Title run number, time offset and time of day.

  CNSCLControlBuffer buffer(m_nBufferSize);
  buffer.PutTitle(MyApp.getTitle());
  buffer.PutTimeOffset(GetElapsedTime());
  buffer.SetRun(GetRunNumber());
  buffer.SetType(BEGRUNBF);
  buffer.Route(false);

}
void 
CExperiment::EmitEnd()
{
  CNSCLControlBuffer buffer(m_nBufferSize);
  buffer.PutTitle(MyApp.getTitle());
  buffer.PutTimeOffset(GetElapsedTime());
  buffer.SetRun(GetRunNumber());
  buffer.SetType(ENDRUNBF);
  buffer.Route(false);
}
void
CExperiment::EmitPause()
{
  CNSCLControlBuffer buffer(m_nBufferSize);
  buffer.PutTitle(MyApp.getTitle());
  buffer.PutTimeOffset(GetElapsedTime());
  buffer.SetRun(GetRunNumber());
  buffer.SetType(PAUSEBF);
  buffer.Route(false);
  
}
void
CExperiment::EmitResume()
{
  CNSCLControlBuffer buffer(m_nBufferSize);
  buffer.PutTitle(MyApp.getTitle());
  buffer.PutTimeOffset(GetElapsedTime());
  buffer.SetRun(GetRunNumber());
  buffer.SetType(RESUMEBF);
  buffer.Route(false);

}
void
CExperiment::StartTrigger()
{
  if(m_pTThread) {              // Should be null...else running.
    throw CDuplicateSingleton("Creating trigger thread",
                              "TriggerThreadObject");
  }
  m_pTThread = new CTriggerThread(this, m_pTrigger);
  m_pTThread->Start();

}
void
CExperiment::StopTrigger()
{
  if(m_pTThread) {
    m_pTThread->Stop();
    delete m_pTThread;
    m_pTThread = (CTriggerThread*)NULL;   
  }
}
RunVariableIterator
CExperiment::EmitRunVariableBuffer(CRunVariableBuffer& rBuffer,
                                   RunVariableIterator start,
                                   RunVariableIterator end)
{
  while(start != end) {
    string item = (start->second)->FormatForBuffer();
    if(!rBuffer.PutEntityString(item)) break; // Won't fit if break.
    start++;
  }
  return start;                 // Return the next entity.
}
StateVariableIterator
CExperiment::EmitStateVariableBuffer(CStateVariableBuffer& rBuffer,
                               StateVariableIterator& start,
                               StateVariableIterator& end)
{
  while(start != end) {
    CStateVariable* pv = start->second;

    string item = pv->FormatForBuffer();
    if(!rBuffer.PutEntityString(item)) break;
    start++;
  }
  return start;
}
DocumentationPacketIterator
CExperiment::EmitDocBuffer(DocumentationPacketIterator s,
                           DocumentationPacketIterator e,
                           CNSCLDocumentationBuffer& b)
{
  while(s != e) {
    string item = (*s)->Format();
    if(!b.PutEntityString(item)) break;
    s++;
  }
  return s;
}
void
CExperiment::Overflow(DAQWordBufferPtr& header,
                      DAQWordBufferPtr& end)
{
   
   // Copy the overflowing event to a new buffer:
   
   CNSCLPhysicsBuffer* pNewBuffer = new CNSCLPhysicsBuffer(m_nBufferSize*2);
   DAQWordBufferPtr    pDest      = pNewBuffer->StartEvent();
   DAQWordBufferPtr    pSrc       = header;
   DAQWordBufferPtr    pEnd       = end;
   while(pSrc != pEnd) {
      *pDest = *pSrc;
      ++pDest; ++pSrc;                // Preinccrement is fastest.
   }
   pNewBuffer->EndEvent(pDest);
   
   // Retract the event from the old buffer and route it:
   
   m_EventBuffer->RetractEvent(header);
   m_EventBuffer->SetRun(GetRunNumber());
   m_EventBuffer->Route();
   delete m_EventBuffer;
   
   // And put the new event buffer in place as the class member.:
   
   m_EventBuffer = pNewBuffer;

}
unsigned short 
CExperiment::GetRunNumber() const
{

  // Locate the state variable command object as it containst the
  // database of state variables.


  CReadoutMain* pReadout        = CReadoutMain::getInstance();
  CInterpreterShell* pShell     = pReadout->getInterpreter();
  CInterpreterCore*  pCore      = pShell->getInterpreterCore();
  CStateVariableCommand& rState(*(pCore->getStateVariables()));

  // Now look for the state variable named "run" as that has the run number.

  StateVariableIterator i = rState.find(string("run"));
  if(i == rState.end()) {
    throw CNoSuchObjectException("Getting the run number variable object",
                                 "run");
  }

  return atoi((i->second)->Get(TCL_GLOBAL_ONLY));

}
unsigned long
CExperiment::GetElapsedTime() const
{
  // Note that CTimer::GetElapsedTime's units are ms.

  return (MyApp.getClock().GetElapsedTime()) / 100;
}
void
CExperiment::SetupTimedEvent()
{
  CTimer& rTimer(MyApp.getClock());
  m_pScalerTrigger = new CScalerTrigger(*this);
  rTimer.EstablishEvent(*m_pScalerTrigger);

}

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