src/engine/Executor.cxx

   1 // Copyright (C) 2006-2024  CEA, EDF
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19
  20 #include "Executor.hxx"
  21 #include "Task.hxx"
  22 #include "AutoLocker.hxx"
  23 #include "Scheduler.hxx"
  24 #include "Dispatcher.hxx"
  25 #include "Container.hxx"
  26 #include "HomogeneousPoolContainer.hxx"
  27 #include "ComponentInstance.hxx"
  28
  29 #include "VisitorSaveState.hxx"
  30 #include "ServiceNode.hxx"
  31 #include "ComposedNode.hxx"
  32
  33 #include "WlmTask.hxx"
  34 #include "workloadmanager/WorkloadManager.hxx"
  35 #include "workloadmanager/DefaultAlgorithm.hxx"
  36
  37 #include <iostream>
  38 #include <fstream>
  39 #include <sys/stat.h>
  40 #ifndef WIN32
  41 #include <sys/time.h>
  42 #include <unistd.h>
  43 #endif
  44
  45 #include <cstdlib>
  46 #include <algorithm>
  47
  48 #ifdef WIN32
  49 #define usleep(A) _sleep(A/1000)
  50 #if !defined(S_ISCHR) || !defined(S_ISREG)
  51 #  ifndef S_IFMT
  52 #    ifdef _S_IFMT
  53 #      define S_IFMT _S_IFMT
  54 #      define S_IFCHR _S_IFCHR
  55 #      define S_IFREG _S_IFREG
  56 #    else
  57 #    ifdef __S_IFMT
  58 #      define S_IFMT __S_IFMT
  59 #      define S_IFCHR __S_IFCHR
  60 #      define S_IFREG __S_IFREG
  61 #    endif
  62 #    endif
  63 #  endif
  64 #  define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
  65 #  define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
  66 #endif
  67 #endif
  68
  69 using namespace YACS::ENGINE;
  70 using namespace std;
  71
  72 using YACS::BASES::Mutex;
  73 using YACS::BASES::Thread;
  74 using YACS::BASES::Semaphore;
  75
  76 //#define _DEVDEBUG_
  77 #include "YacsTrace.hxx"
  78
  79 int Executor::_maxThreads(1000);
  80 size_t Executor::_threadStackSize(262144); // Default thread stack size is 256 kB == 2**18 because threads launched by YACS are lightweight
  81
  82 Executor::Executor():_mainSched(NULL),_isWaitingEventsFromRunningTasks(false),_nbOfConcurrentThreads(0), _semForMaxThreads(_maxThreads),_keepGoingOnFail(false),_DPLScopeSensitive(false)
  83 {
  84   _root=0;
  85   _toContinue = true;
  86   _isOKToEnd = false;
  87   _stopOnErrorRequested = false;
  88   _dumpOnErrorRequested = false;
  89   _errorDetected = false;
  90   _isRunningunderExternalControl=false;
  91   _executorState = YACS::NOTYETINITIALIZED;
  92   _execMode = YACS::CONTINUE;
  93   _semThreadCnt = _maxThreads;
  94   _numberOfRunningTasks = 0;
  95   _numberOfEndedTasks = 0;
  96   DEBTRACE("Executor initialized with max threads = " << _maxThreads);
  97 }
  98
  99 Executor::~Executor()
 100 {
 101 }
 102
 103 //! Execute a graph waiting for completion
 104 /*!
 105  *  \param graph : schema to execute
 106  *  \param debug : display the graph with dot if debug == 1
 107  *  \param fromScratch : if true the graph is reinitialized
 108  *
 109  *  Calls Scheduler::getNextTasks and Scheduler::selectRunnableTasks to select tasks to execute
 110  *
 111  *  Calls Executor::launchTask to execute a selected Task.
 112  *
 113  *  Completion when graph is finished (Scheduler::isFinished)
 114  */
 115
 116 void Executor::RunA(Scheduler *graph,int debug, bool fromScratch)
 117 {
 118   DEBTRACE("Executor::RunW debug: " << debug << " fromScratch: " << fromScratch);
 119   _mainSched=graph;
 120   _root = dynamic_cast<ComposedNode *>(_mainSched);
 121   if (!_root) throw Exception("Executor::Run, Internal Error!");
 122   bool isMore;
 123   int i=0;
 124   if(debug>1)_displayDot(graph);
 125   if (fromScratch)
 126     {
 127       graph->init();
 128       graph->exUpdateState();
 129     }
 130   if(debug>1)_displayDot(graph);
 131   vector<Task *> tasks;
 132   vector<Task *>::iterator iter;
 133   _toContinue=true;
 134   _execMode = YACS::CONTINUE;
 135   _isWaitingEventsFromRunningTasks = false;
 136   _numberOfRunningTasks = 0;
 137   _runningTasks.clear();
 138   _numberOfEndedTasks=0;
 139   while(_toContinue)
 140     {
 141       sleepWhileNoEventsFromAnyRunningTask();
 142
 143       if(debug>2)_displayDot(graph);
 144
 145       {//Critical section
 146         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 147         tasks=graph->getNextTasks(isMore);
 148         graph->selectRunnableTasks(tasks);
 149       }//End of critical section
 150
 151       if(debug>2)_displayDot(graph);
 152
 153       for(iter=tasks.begin();iter!=tasks.end();iter++)
 154         loadTask(*iter,this);
 155
 156       if(debug>1)_displayDot(graph);
 157
 158       launchTasks(tasks);
 159
 160       if(debug>1)_displayDot(graph);
 161
 162       {//Critical section
 163         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 164         _toContinue=!graph->isFinished();
 165       }//End of critical section
 166       DEBTRACE("_toContinue: " << _toContinue);
 167
 168       if(debug>0)_displayDot(graph);
 169
 170       i++;
 171     }
 172 }
 173
 174 //! Execute a graph with breakpoints or step by step
 175 /*!
 176  *  To be launch in a thread (main thread controls the progression).
 177  *  \param graph : schema to execute
 178  *  \param debug : display the graph with dot if debug >0
 179  *  \param fromScratch : if false, state from a previous partial exection is already loaded
 180  *
 181  *  Calls Scheduler::getNextTasks and Scheduler::selectRunnableTasks to select tasks to execute
 182  *
 183  *  Calls Executor::checkBreakPoints to verify if a pause is requested
 184  *
 185  *  Calls Executor::launchTask to execute a selected Task
 186  *
 187  *  Completion when graph is finished (Scheduler::isFinished)
 188  *
 189  *  States of execution:
 190  *  - YACS::NOTYETINITIALIZED
 191  *  - YACS::INITIALISED
 192  *  - YACS::RUNNING            (to next breakpoint or step)
 193  *  - YACS::WAITINGTASKS       (a breakpoint or step as been reached, but there are still running tasks)
 194  *  - YACS::PAUSED             (a breakpoint or step as been reached, no more running tasks)
 195  *  - YACS::FINISHED           (no more ready tasks, nore running tasks)
 196  *  - YACS::STOPPED            (stopped by user before end)
 197  *
 198  *  Modes of Execution:
 199  *  - YACS::CONTINUE           (normal run without breakpoints)
 200  *  - YACS::STEPBYSTEP         (pause at each loop)
 201  *  - YACS::STOPBEFORENODES    (pause when a node is reached)
 202  *
 203  *  A breakpoint is defined by a node name. The breakpoint is reached when the node becomes ready.
 204  *  Step by Step means execution node by node or group of node by group of nodes.
 205  *  At a given step, the user decides to launch all the ready nodes or only a subset
 206  *  (Caution: some nodes must run in parallel).
 207  *  The next event (end of task) may give a new set of ready nodes, and define a new step.
 208  *
 209  *  The graph execution may be controled by a pilot which sends requests. Requests are asynchronous.
 210  *  Requests are taken into account only on certain states, otherwise return the status IgnoredRequest.
 211  *  - Executor::getCurrentExecMode
 212  *  - Executor::getExecutorState
 213  *  - Executor::setExecMode             : change the execution mode for next loop
 214  *  - Executor::setListOfBreakPoints    : must be set before setting YACS::STOPBEFORENODES
 215  *  - Executor::getTasksToLoad          : when paused or waiting tasks, get the list of next tasks
 216  *  - Executor::setStepsToExecute       : define a subset of the list given by Executor::getTasksToLoad
 217  *  - Executor::resumeCurrentBreakPoint : when paused or waiting tasks, resumes execution
 218  *  - Executor::isNotFinished
 219  *  - Executor::stopExecution           : stop execution asap, i.e. set STEPBYSTEP and wait PAUSED
 220  *  - Executor::saveState               : dump the current state of execution in an xml file
 221  *  - Executor::loadState               : Not yet implemented
 222  *  - Executor::getNbOfThreads
 223  *  - Executor::displayDot
 224  *  - Executor::setStopOnError          : ask to stop execution if a node is found in ERROR state
 225  *
 226  *  If the pilot wants to wait the state YACS::PAUSED or YACS::WAITINGTASKS, synchronisation is obtained with:
 227  *  - Executor::waitPause
 228  *
 229  *  TO BE VALIDATED:
 230  *  - Pilot may connect to executor during execution, or deconnect.
 231  *  - Several Pilots may be connected at the same time (for observation...)
 232  *
 233  */
 234
 235 void Executor::RunB(Scheduler *graph,int debug, bool fromScratch)
 236 {
 237   DEBTRACE("Executor::RunB debug: "<< graph->getName() <<" "<< debug<<" fromScratch: "<<fromScratch);
 238
 239   { // --- Critical section
 240     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 241     _mainSched = graph;
 242     _root = dynamic_cast<ComposedNode *>(_mainSched);
 243     if (!_root) throw Exception("Executor::Run, Internal Error!");
 244     _executorState = YACS::NOTYETINITIALIZED;
 245     sendEvent("executor");
 246     _toContinue=true;
 247     _isOKToEnd = false;
 248     _errorDetected = false;
 249     _isWaitingEventsFromRunningTasks = false;
 250     _numberOfRunningTasks = 0;
 251     _runningTasks.clear();
 252     _numberOfEndedTasks = 0;
 253     string tracefile = "traceExec_";
 254     tracefile += _mainSched->getName();
 255     _trace.open(tracefile.c_str());
 256     _start = std::chrono::steady_clock::now();
 257   } // --- End of critical section
 258
 259   if (debug > 1) _displayDot(graph);
 260
 261   if (fromScratch)
 262     {
 263       try
 264         {
 265           graph->init();
 266           graph->exUpdateState();
 267         }
 268       catch(Exception& ex)
 269         {
 270           DEBTRACE("exception: "<< (ex.what()));
 271           _executorState = YACS::FINISHED;
 272           sendEvent("executor");
 273           throw;
 274         }
 275     }
 276   _executorState = YACS::INITIALISED;
 277   sendEvent("executor");
 278
 279   if (debug > 1) _displayDot(graph);
 280
 281   vector<Task *>::iterator iter;
 282   bool isMore;
 283   int problemCount=0;
 284   int numberAllTasks;
 285
 286   _executorState = YACS::RUNNING;
 287   sendEvent("executor");
 288   while (_toContinue)
 289     {
 290       DEBTRACE("--- executor main loop");
 291       sleepWhileNoEventsFromAnyRunningTask();
 292       DEBTRACE("--- events...");
 293       if (debug > 2) _displayDot(graph);
 294       { // --- Critical section
 295         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 296         std::vector<Task *> tasks = graph->getNextTasks(isMore);
 297         graph->selectRunnableTasks(tasks);
 298         filterTasksConsideringContainers(tasks);
 299         _tasks = tasks;
 300         numberAllTasks=_numberOfRunningTasks+_tasks.size();
 301       } // --- End of critical section
 302       if (debug > 2) _displayDot(graph);
 303       if (_executorState == YACS::RUNNING)
 304         {
 305           if (checkBreakPoints()) break; // end of thread requested, OK to exit at once;
 306           if (debug > 0) _displayDot(graph);
 307           DEBTRACE("---");
 308           loadParallelTasks(_tasks,this);
 309           if (debug > 1) _displayDot(graph);
 310           DEBTRACE("---");
 311           launchTasks(_tasks);
 312           DEBTRACE("---");
 313         }
 314       if (debug > 1) _displayDot(graph);
 315       { // --- Critical section
 316         DEBTRACE("---");
 317         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 318         //It is possible that the graph is finished but it remains running tasks (it's an error but we must take it into account)
 319         if(_numberOfRunningTasks == 0)
 320           _toContinue = !graph->isFinished();
 321
 322         DEBTRACE("_numberOfRunningTasks: " << _numberOfRunningTasks);
 323         DEBTRACE("_numberOfEndedTasks: " << _numberOfEndedTasks);
 324         DEBTRACE("_toContinue: " << _toContinue);
 325         if(_toContinue && numberAllTasks==0)
 326           {
 327             //Problem : no running tasks and no task to launch ??
 328             problemCount++;
 329             std::cerr << "Problem in Executor : no running tasks and no task to launch ?? problemCount=" << problemCount << std::endl;
 330             //Pause to give a chance to interrupt
 331             usleep(1000);
 332             if(problemCount > 25)
 333               {
 334                 // Too much problems encountered : stop execution
 335                 _toContinue=false;
 336               }
 337           }
 338
 339         if (! _toContinue)
 340           {
 341             _executorState = YACS::FINISHED;
 342             sendEvent("executor");
 343             _condForPilot.notify_all();
 344           }
 345       } // --- End of critical section
 346       if (debug > 0) _displayDot(graph);
 347       DEBTRACE("_toContinue: " << _toContinue);
 348     }
 349
 350   DEBTRACE("End of main Loop");
 351
 352   { // --- Critical section
 353     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 354     if ( _toContinue) // --- break while(): request to stop detected on checkBreakPoints()
 355       {
 356         DEBTRACE("stop requested: End soon");
 357         _executorState = YACS::STOPPED;
 358         _toContinue = false;
 359         sendEvent("executor");
 360       }
 361   } // --- End of critical section
 362   if ( _dumpOnErrorRequested && _errorDetected)
 363     {
 364       saveState(_dumpErrorFile);
 365     }
 366   {
 367     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForTrace);
 368     _trace.close();
 369   }
 370   DEBTRACE("End of RunB thread");
 371 }
 372
 373 YACS::ExecutionMode Executor::getCurrentExecMode()
 374 {
 375   _isRunningunderExternalControl=true;
 376   return _execMode;
 377 }
 378
 379
 380 YACS::ExecutorState Executor::getExecutorState()
 381 {
 382   _isRunningunderExternalControl=true;
 383   return _executorState;
 384 }
 385
 386
 387 bool Executor::isNotFinished()
 388 {
 389   _isRunningunderExternalControl=true;
 390   return _toContinue;
 391 }
 392
 393 //! ask to stop execution on the first node found in error
 394 /*!
 395  * \param dumpRequested   produce a state dump when an error is found
 396  * \param xmlFile         name of file used for state dump
 397  */
 398
 399 void Executor::setStopOnError(bool dumpRequested, std::string xmlFile)
 400 {
 401   { // --- Critical section
 402     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 403     _dumpErrorFile=xmlFile;
 404     _stopOnErrorRequested=true;
 405     _dumpOnErrorRequested = dumpRequested;
 406     if (dumpRequested && xmlFile.empty())
 407       throw YACS::Exception("dump on error requested and no filename given for dump");
 408     DEBTRACE("_dumpErrorFile " << _dumpErrorFile << " " << _dumpOnErrorRequested);
 409   } // --- End of critical section
 410 }
 411
 412 //! ask to do not stop execution on nodes found in error
 413 /*!
 414  */
 415
 416 void Executor::unsetStopOnError()
 417 {
 418   { // --- Critical section
 419     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 420     _stopOnErrorRequested=false;
 421   } // --- End of critical section
 422 }
 423
 424 //! Dynamically set the current mode of execution
 425 /*!
 426  * The mode can be Continue, step by step, or stop before execution of a node
 427  * defined in a list of breakpoints.
 428  */
 429
 430 void Executor::setExecMode(YACS::ExecutionMode mode)
 431 {
 432   DEBTRACE("Executor::setExecMode(YACS::ExecutionMode mode) " << mode);
 433   { // --- Critical section
 434     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 435     _isRunningunderExternalControl=true;
 436     _execMode = mode;
 437   } // --- End of critical section
 438 }
 439
 440 //! wake up executor when in pause
 441 /*!
 442  * When Executor is in state paused or waiting for task completion, the thread
 443  * running loop RunB waits on condition _condForStepByStep.
 444  * Thread RunB is waken up.
 445  * \return true when actually wakes up executor
 446  */
 447
 448 bool Executor::resumeCurrentBreakPoint()
 449 {
 450   DEBTRACE("Executor::resumeCurrentBreakPoint()");
 451   bool ret = false;
 452   //bool doDump = false;
 453   { // --- Critical section
 454     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 455     _isRunningunderExternalControl=true;
 456     DEBTRACE("_executorState: " << _executorState);
 457     switch (_executorState)
 458       {
 459       case YACS::WAITINGTASKS:
 460       case YACS::PAUSED:
 461         {
 462           _condForStepByStep.notify_all();
 463           _executorState = YACS::RUNNING;
 464           sendEvent("executor");
 465           ret = true;
 466           //if (_dumpOnErrorRequested && _errorDetected) doDump =true;
 467           break;
 468         }
 469       case YACS::FINISHED:
 470       case YACS::STOPPED:
 471         {
 472           //if (_dumpOnErrorRequested && _errorDetected) doDump =true;
 473           DEBTRACE("Graph Execution finished or stopped !");
 474           break;
 475         }
 476       default :
 477         {
 478           // debug: no easy way to verify if main loop is acutally waiting on condition
 479         }
 480       }
 481     DEBTRACE("---");
 482     //if (doDump) saveState(_dumpErrorFile);
 483   } // --- End of critical section
 484   return ret;
 485 }
 486
 487
 488 //! define a list of nodes names as breakpoints in the graph
 489
 490
 491 void Executor::setListOfBreakPoints(std::list<std::string> listOfBreakPoints)
 492 {
 493   DEBTRACE("Executor::setListOfBreakPoints(std::list<std::string> listOfBreakPoints)");
 494   { // --- Critical section
 495     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 496     _isRunningunderExternalControl=true;
 497     _listOfBreakPoints = listOfBreakPoints;
 498   } // --- End of critical section
 499 }
 500
 501
 502 //! Get the list of tasks to load, to define a subset to execute in step by step mode
 503 /*!
 504  *  If the executor is not in mode YACS::WAITINGTASKS nor YACS::PAUSED, the list is empty.
 505  *  Use Executor::waitPause to wait.
 506  */
 507 std::list<std::string> Executor::getTasksToLoad()
 508 {
 509   DEBTRACE("Executor::getTasksToLoad()");
 510   list<string> listOfNodesToLoad;
 511   listOfNodesToLoad.clear();
 512   { // --- Critical section
 513     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 514     _isRunningunderExternalControl=true;
 515     switch (_executorState)
 516       {
 517       case YACS::WAITINGTASKS:
 518       case YACS::PAUSED:
 519         {
 520           listOfNodesToLoad = _listOfTasksToLoad;
 521           break;
 522         }
 523       case YACS::NOTYETINITIALIZED:
 524       case YACS::INITIALISED:
 525       case YACS::RUNNING:
 526       case YACS::FINISHED:
 527       case YACS::STOPPED:
 528       default:
 529         {
 530           break;
 531         }
 532       }
 533   } // --- End of critical section
 534   return listOfNodesToLoad;
 535 }
 536
 537
 538 //! Define a subset of task to execute in step by step mode
 539 /*!
 540  * Behaviour is unpredictable if the list is not a subset of the list given by Executor::getTasksToLoad
 541  * in the current step.
 542  * If some nodes must run in parallel, they must stay together in the list.
 543  */
 544
 545 bool Executor::setStepsToExecute(std::list<std::string> listToExecute)
 546 {
 547   DEBTRACE("Executor::setStepsToExecute(std::list<std::string> listToExecute)");
 548   bool ret = true;
 549   vector<Task *>::iterator iter;
 550   vector<Task *> restrictedTasks;
 551   { // --- Critical section
 552     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 553     _isRunningunderExternalControl=true;
 554     switch (_executorState)
 555       {
 556       case YACS::WAITINGTASKS:
 557       case YACS::PAUSED:
 558         {
 559           for (iter=_tasksSave.begin(); iter!=_tasksSave.end(); iter++)
 560             {
 561               string readyNode = _mainSched->getTaskName(*iter);
 562               if (find(listToExecute.begin(), listToExecute.end(), readyNode)
 563                   != listToExecute.end())
 564                 {
 565                   restrictedTasks.push_back(*iter);
 566                   DEBTRACE("node to execute " << readyNode);
 567                 }
 568             }
 569           _tasks.clear();
 570           for (iter=restrictedTasks.begin(); iter!=restrictedTasks.end(); iter++)
 571             {
 572               _tasks.push_back(*iter);
 573             }
 574           break;
 575         }
 576       case YACS::NOTYETINITIALIZED:
 577       case YACS::INITIALISED:
 578       case YACS::RUNNING:
 579       case YACS::FINISHED:
 580       case YACS::STOPPED:
 581       default:
 582         {
 583           break;
 584         }
 585       }
 586     } // --- End of critical section
 587
 588   _tasks.clear();
 589   for (iter=restrictedTasks.begin(); iter!=restrictedTasks.end(); iter++)
 590     {
 591       _tasks.push_back(*iter);
 592     }
 593   for (iter=_tasks.begin(); iter!=_tasks.end(); iter++)
 594     {
 595       string readyNode = _mainSched->getTaskName(*iter);
 596       DEBTRACE("selected node to execute " << readyNode);
 597     }
 598
 599   return ret;
 600 }
 601
 602 //! suspend pilot execution until Executor is in pause or waiting tasks completion mode.
 603 /*!
 604  *  Do nothing if execution is finished or in pause.
 605  *  Wait first step if Executor is running or in initialization.
 606  */
 607
 608 void Executor::waitPause()
 609 {
 610   DEBTRACE("Executor::waitPause()" << _executorState);
 611   { // --- Critical section
 612     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 613     _isRunningunderExternalControl=true;
 614     switch (_executorState)
 615       {
 616       default:
 617       case YACS::STOPPED:
 618       case YACS::FINISHED:
 619       case YACS::WAITINGTASKS:
 620       case YACS::PAUSED:
 621         {
 622           break;
 623         }
 624       case YACS::NOTYETINITIALIZED:
 625       case YACS::INITIALISED:
 626       case YACS::RUNNING:
 627         {
 628           _condForPilot.wait(_mutexForSchedulerUpdate); // wait until executor is PAUSED or WAITINGTASKS
 629           break;
 630         }
 631       }
 632   } // --- End of critical section
 633   DEBTRACE("---");
 634 }
 635
 636 /*!
 637  * This method can be called at any time simultaneously during a RunB call.
 638  * This method will wait until the executor is locked in a consistent state of a running graph.
 639  *
 640  * This method is expected to be called in association with resume method.
 641  * The returned parameter is expected to be transfered to resume method.
 642  */
 643 bool Executor::suspendASAP()
 644 {
 645   // no AutoLocker here. It's not a bug.
 646   _mutexForSchedulerUpdate.lock();
 647   if(!_toContinue && _executorState==YACS::FINISHED)
 648     {// execution is finished
 649       _mutexForSchedulerUpdate.unLock();
 650       return false;// the executor is no more running
 651     }
 652   //general case. Leave method with locker in locked status
 653   return true;
 654 }
 655
 656 /*!
 657  * This method is expected to be called in association with suspendASAP method.
 658  * Expected to be called just after suspendASAP with output of resume as input parameter
 659  */
 660 void Executor::resume(bool suspended)
 661 {
 662   if(suspended)
 663     _mutexForSchedulerUpdate.unLock();
 664 }
 665
 666 //! stops the execution as soon as possible
 667
 668 void Executor::stopExecution()
 669 {
 670   setExecMode(YACS::STEPBYSTEP);
 671   //waitPause();
 672   _isOKToEnd = true;
 673   resumeCurrentBreakPoint();
 674 }
 675
 676 //! save the current state of execution in an xml file
 677
 678 bool Executor::saveState(const std::string& xmlFile)
 679 {
 680   DEBTRACE("Executor::saveState() in " << xmlFile);
 681   bool result = false;
 682   try {
 683     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 684     YACS::ENGINE::VisitorSaveState vst(_root);
 685     vst.openFileDump(xmlFile.c_str());
 686     _root->accept(&vst);
 687     vst.closeFileDump();
 688     result = true;
 689   }
 690   catch(Exception& ex) {
 691     std::cerr << ex.what() << std::endl;
 692   }
 693   return result;
 694 }
 695
 696 //! not yet implemented
 697
 698 bool Executor::loadState()
 699 {
 700   DEBTRACE("Executor::loadState()");
 701   _isRunningunderExternalControl=true;
 702   return true;
 703 }
 704
 705
 706 static int isfile(const char *filename)
 707 {
 708   struct stat buf;
 709   if (stat(filename, &buf) != 0)
 710     return 0;
 711   if (!S_ISREG(buf.st_mode))
 712     return 0;
 713   return 1;
 714 }
 715
 716 //! Display the graph state as a dot display, public method
 717
 718 void Executor::displayDot(Scheduler *graph)
 719 {
 720   _isRunningunderExternalControl=true;
 721   _displayDot(graph);
 722 }
 723
 724 //! Display the graph state as a dot display
 725 /*!
 726  *  \param graph  : the node to display
 727  */
 728
 729 void Executor::_displayDot(Scheduler *graph)
 730 {
 731    std::ofstream g("titi");
 732    ((ComposedNode*)graph)->writeDot(g);
 733    g.close();
 734    const char displayScript[]="display.sh";
 735    if(isfile(displayScript))
 736      system("sh display.sh");
 737    else
 738      system("dot -Tpng titi|display -delay 5");
 739 }
 740
 741 //! Wait reactivation in modes Step By step or with BreakPoints
 742 /*!
 743  *  Check mode of execution (set by main thread):
 744  *  - YACS::CONTINUE        : the graph execution continues.
 745  *  - YACS::STEPBYSTEP      : wait on condition (pilot thread, Executor::resumeCurrentBreakPoint)
 746  *  - YACS::STOPBEFORENODES : if there are ready nodes in a list of breakpoints,
 747  *                            wait on condition (pilot thread, Executor::resumeCurrentBreakPoint)
 748  *                            else continue the graph execution.
 749  *  \return true if end of executor thread is requested
 750  */
 751
 752 bool Executor::checkBreakPoints()
 753 {
 754   DEBTRACE("Executor::checkBreakPoints()");
 755   vector<Task *>::iterator iter;
 756   bool endRequested = false;
 757
 758   switch (_execMode)
 759     {
 760     case YACS::CONTINUE:
 761       {
 762         break;
 763       }
 764     case YACS::STOPBEFORENODES:
 765       {
 766         bool stop = false;
 767         { // --- Critical section
 768           YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 769           _tasksSave = _tasks;
 770           for (iter=_tasks.begin(); iter!=_tasks.end(); iter++)
 771             {
 772               string nodeToLoad = _mainSched->getTaskName(*iter);
 773               if (find(_listOfBreakPoints.begin(), _listOfBreakPoints.end(), nodeToLoad)
 774                   != _listOfBreakPoints.end())
 775                 {
 776                   stop = true;
 777                   break;
 778                 }
 779             }
 780           if (stop)
 781             {
 782               _listOfTasksToLoad.clear();
 783               for (iter=_tasks.begin(); iter!=_tasks.end(); iter++)
 784                 {
 785                   string nodeToLoad = _mainSched->getTaskName(*iter);
 786                   _listOfTasksToLoad.push_back(nodeToLoad);
 787                 }
 788               if (getNbOfThreads())
 789                 _executorState = YACS::WAITINGTASKS; // will be paused after completion of running tasks
 790               else
 791                 _executorState = YACS::PAUSED;
 792               sendEvent("executor");
 793               _condForPilot.notify_all();
 794             }
 795           if (stop && !_isOKToEnd) waitResume(); // wait until pilot calls resumeCurrentBreakPoint(), mutex released during wait
 796           if (_isOKToEnd) endRequested = true;
 797         } // --- End of critical section
 798           if (stop) DEBTRACE("wake up from waitResume");
 799         break;
 800       }
 801     default:
 802     case YACS::STEPBYSTEP:
 803       {
 804         { // --- Critical section
 805           YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 806           _tasksSave = _tasks;
 807           _listOfTasksToLoad.clear();
 808           for (iter=_tasks.begin(); iter!=_tasks.end(); iter++)
 809             {
 810               string nodeToLoad = _mainSched->getTaskName(*iter);
 811               _listOfTasksToLoad.push_back(nodeToLoad);
 812             }
 813           if (getNbOfThreads())
 814             _executorState = YACS::WAITINGTASKS; // will be paused after completion of running tasks
 815           else
 816             _executorState = YACS::PAUSED;
 817           sendEvent("executor");
 818           _condForPilot.notify_all();
 819           if (!_isOKToEnd)
 820             waitResume(); // wait until pilot calls resumeCurrentBreakPoint(), mutex released during wait
 821                           // or, if no pilot, wait until no more running tasks (stop on error)
 822           if (_isOKToEnd) endRequested = true;
 823         } // --- End of critical section
 824         DEBTRACE("wake up from waitResume");
 825         break;
 826       }
 827     }
 828   DEBTRACE("endRequested: " << endRequested);
 829   return endRequested;
 830 }
 831
 832
 833 //! in modes Step By step or with BreakPoint, wait until pilot resumes the execution
 834 /*!
 835  *  With the condition Mutex, the mutex is released atomically during the wait.
 836  *  Pilot calls Executor::resumeCurrentBreakPoint to resume execution.
 837  *  Must be called while mutex is locked.
 838  */
 839
 840 void Executor::waitResume()
 841 {
 842   DEBTRACE("Executor::waitResume()");
 843   _condForStepByStep.wait(_mutexForSchedulerUpdate); // wait until pilot calls resumeCurrentBreakPoint()
 844   DEBTRACE("---");
 845 }
 846
 847
 848 //! Perform loading of a Task.
 849 /*!
 850  *  \param task  : Task to load
 851  */
 852
 853 void Executor::loadTask(Task *task, const Executor *execInst)
 854 {
 855   DEBTRACE("Executor::loadTask(Task *task)");
 856   if(task->getState() != YACS::TOLOAD)
 857     return;
 858   traceExec(task, "state:TOLOAD", ComputePlacement(task));
 859   {//Critical section
 860     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 861     _mainSched->notifyFrom(task,YACS::START,execInst);
 862   }//End of critical section
 863   try
 864     {
 865       traceExec(task, "load", ComputePlacement(task));
 866       task->load();
 867       traceExec(task, "initService", ComputePlacement(task));
 868       task->initService();
 869     }
 870   catch(Exception& ex)
 871     {
 872       std::cerr << ex.what() << std::endl;
 873       {//Critical section
 874         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 875         task->aborted();
 876         _mainSched->notifyFrom(task,YACS::ABORT,execInst);
 877         traceExec(task, "state:"+Node::getStateName(task->getState()), ComputePlacement(task));
 878       }//End of critical section
 879     }
 880   catch(...)
 881     {
 882       std::cerr << "Load failed" << std::endl;
 883       {//Critical section
 884         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 885         task->aborted();
 886         _mainSched->notifyFrom(task,YACS::ABORT,execInst);
 887         traceExec(task, "state:"+Node::getStateName(task->getState()), ComputePlacement(task));
 888       }//End of critical section
 889     }
 890 }
 891
 892 struct threadargs
 893 {
 894   Task *task;
 895   Scheduler *sched;
 896   Executor *execInst;
 897 };
 898
 899 void Executor::loadParallelTasks(const std::vector<Task *>& tasks, const Executor *execInst)
 900 {
 901   std::vector<Thread> ths(tasks.size());
 902   std::size_t ithread(0);
 903   for(std::vector<Task *>::const_iterator iter = _tasks.begin(); iter != _tasks.end(); iter++, ithread++)
 904     {
 905       DEBTRACE("Executor::loadParallelTasks(Task *task)");
 906       struct threadargs *args(new threadargs);
 907       args->task = (*iter);
 908       args->sched = _mainSched;
 909       args->execInst = this;
 910       ths[ithread].go(functionForTaskLoad, args, _threadStackSize);
 911     }
 912   for(ithread=0;ithread<tasks.size();ithread++)
 913     ths[ithread].join();
 914 }
 915
 916 //! Execute a list of tasks possibly connected through datastream links
 917 /*!
 918  *  \param tasks  : a list of tasks to execute
 919  *
 920  */
 921 void Executor::launchTasks(const std::vector<Task *>& tasks)
 922 {
 923   //First phase, make datastream connections
 924   for(vector<Task *>::const_iterator iter=tasks.begin();iter!=tasks.end();iter++)
 925     {
 926       YACS::StatesForNode state=(*iter)->getState();
 927       if(state != YACS::TOLOAD && state != YACS::TORECONNECT)continue;
 928       try
 929         {
 930           (*iter)->connectService();
 931           traceExec(*iter, "connectService",ComputePlacement(*iter));
 932           {//Critical section
 933             YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 934             (*iter)->connected();
 935           }//End of critical section
 936         }
 937       catch(Exception& ex)
 938         {
 939           std::cerr << ex.what() << std::endl;
 940           try
 941             {
 942               (*iter)->disconnectService();
 943               traceExec(*iter, "disconnectService",ComputePlacement(*iter));
 944             }
 945           catch(...)
 946             {
 947               // Disconnect has failed
 948               traceExec(*iter, "disconnectService failed, ABORT",ComputePlacement(*iter));
 949             }
 950           {//Critical section
 951             YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 952             (*iter)->aborted();
 953             _mainSched->notifyFrom(*iter,YACS::ABORT,this);
 954           }//End of critical section
 955         }
 956       catch(...)
 957         {
 958           std::cerr << "Problem in connectService" << std::endl;
 959           try
 960             {
 961               (*iter)->disconnectService();
 962               traceExec(*iter, "disconnectService",ComputePlacement(*iter));
 963             }
 964           catch(...)
 965             {
 966               // Disconnect has failed
 967               traceExec(*iter, "disconnectService failed, ABORT",ComputePlacement(*iter));
 968             }
 969           {//Critical section
 970             YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 971             (*iter)->aborted();
 972             _mainSched->notifyFrom(*iter,YACS::ABORT,this);
 973           }//End of critical section
 974         }
 975       if((*iter)->getState() == YACS::ERROR)
 976         {
 977           //try to put all coupled tasks in error
 978           std::set<Task*> coupledSet;
 979           (*iter)->getCoupledTasks(coupledSet);
 980           for (std::set<Task*>::iterator it = coupledSet.begin(); it != coupledSet.end(); ++it)
 981             {
 982               Task* t=*it;
 983               if(t == *iter)continue;
 984               if(t->getState() == YACS::ERROR)continue;
 985               try
 986                 {
 987                   t->disconnectService();
 988                   traceExec(t, "disconnectService",ComputePlacement(*iter));
 989                 }
 990               catch(...)
 991                 {
 992                   // Disconnect has failed
 993                   traceExec(t, "disconnectService failed, ABORT",ComputePlacement(*iter));
 994                 }
 995               {//Critical section
 996                 YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
 997                 t->aborted();
 998                 _mainSched->notifyFrom(t,YACS::ABORT,this);
 999               }//End of critical section
1000               traceExec(t, "state:"+Node::getStateName(t->getState()),ComputePlacement(*iter));
1001             }
1002         }
1003       traceExec(*iter, "state:"+Node::getStateName((*iter)->getState()),ComputePlacement(*iter));
1004     }
1005
1006   //Second phase, execute each task in a thread
1007   for(vector<Task *>::const_iterator iter=tasks.begin();iter!=tasks.end();iter++)
1008     {
1009       launchTask(*iter);
1010     }
1011 }
1012
1013 //! Execute a Task in a thread
1014 /*!
1015  *  \param task  : Task to execute
1016  *
1017  *  Calls Scheduler::notifyFrom of main node (_mainSched) to notify start
1018  *
1019  *  Calls Executor::functionForTaskExecution in Thread
1020  */
1021
1022 void Executor::launchTask(Task *task)
1023 {
1024   DEBTRACE("Executor::launchTask(Task *task)");
1025   struct threadargs *args;
1026   if(task->getState() != YACS::TOACTIVATE)return;
1027
1028   DEBTRACE("before _semForMaxThreads.wait " << _semThreadCnt);
1029   if(_semThreadCnt == 0)
1030     {
1031       // --- Critical section
1032       YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1033       //check if we have enough threads to run
1034       std::set<Task*> tmpSet=_runningTasks;
1035       std::set<Task*>::iterator it = tmpSet.begin();
1036       std::string status="running";
1037       std::set<Task*> coupledSet;
1038       while( it != tmpSet.end() )
1039         {
1040           Task* tt=*it;
1041           coupledSet.clear();
1042           tt->getCoupledTasks(coupledSet);
1043           status="running";
1044           for (std::set<Task*>::iterator iter = coupledSet.begin(); iter != coupledSet.end(); ++iter)
1045             {
1046               if((*iter)->getState() == YACS::TOACTIVATE)status="toactivate";
1047               tmpSet.erase(*iter);
1048             }
1049           if(status=="running")break;
1050           it = tmpSet.begin();
1051         }
1052
1053       if(status=="toactivate")
1054         {
1055           std::cerr << "WARNING: maybe you need more threads to run your schema (current value="<< _maxThreads << ")" << std::endl;
1056           std::cerr << "If it is the case, set the YACS_MAX_THREADS environment variable to a bigger value (export YACS_MAX_THREADS=xxx)" << std::endl;
1057         }
1058       // --- End of critical section
1059     }
1060
1061   _semForMaxThreads.wait();
1062   _semThreadCnt -= 1;
1063
1064   args= new threadargs;
1065   args->task = task;
1066   args->sched = _mainSched;
1067   args->execInst = this;
1068
1069   traceExec(task, "launch",ComputePlacement(task));
1070
1071   { // --- Critical section
1072     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1073     _numberOfRunningTasks++;
1074     _runningTasks.insert(task);
1075     task->begin(); //change state to ACTIVATED
1076   } // --- End of critical section
1077   Thread(functionForTaskExecution, args, _threadStackSize);
1078 }
1079
1080 //! wait until a running task ends
1081
1082 void Executor::sleepWhileNoEventsFromAnyRunningTask()
1083 {
1084   DEBTRACE("Executor::sleepWhileNoEventsFromAnyRunningTask()");
1085 //   _semForNewTasksToPerform.wait(); //----utiliser pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);
1086   YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1087   if (_numberOfRunningTasks > 0 && _numberOfEndedTasks==0)
1088     {
1089       _isWaitingEventsFromRunningTasks = true;
1090       _condForNewTasksToPerform.wait(_mutexForSchedulerUpdate); // mutex released during wait
1091     }
1092   _numberOfEndedTasks=0;
1093   DEBTRACE("---");
1094 }
1095
1096
1097 //! must be used protected by _mutexForSchedulerUpdate!
1098
1099 void Executor::wakeUp()
1100 {
1101   DEBTRACE("Executor::wakeUp() " << _isWaitingEventsFromRunningTasks);
1102   if (_isWaitingEventsFromRunningTasks)
1103     {
1104       _isWaitingEventsFromRunningTasks = false;
1105       _condForNewTasksToPerform.notify_all();
1106     }
1107   else
1108     _numberOfEndedTasks++;
1109 }
1110
1111 int Executor::getMaxNbOfThreads() const
1112 {
1113   return (int)_maxNbThreads;
1114 }
1115
1116 void Executor::setMaxNbOfThreads(int maxNbThreads)
1117 {
1118   _maxNbThreads = static_cast< std::uint32_t >(maxNbThreads);
1119 }
1120
1121 int Executor::getNbOfThreads()
1122 {
1123   int ret = 0;
1124   YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForNbOfConcurrentThreads);
1125   _isRunningunderExternalControl=true;
1126   return ret;
1127 }
1128
1129 //! number of running tasks
1130 int Executor::getNumberOfRunningTasks()
1131 {
1132   YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1133   _isRunningunderExternalControl=true;
1134   return _numberOfRunningTasks;
1135 }
1136
1137 /*!
1138  * This thread is NOT supposed to be detached !
1139  */
1140 void *Executor::functionForTaskLoad(void *arg)
1141 {
1142   DEBTRACE("Executor::functionForTaskLoad(void *arg)");
1143   struct threadargs *args = (struct threadargs *) arg;
1144   Task *task=args->task;
1145   Scheduler *sched=args->sched;
1146   Executor *execInst=args->execInst;
1147   delete args;
1148   execInst->loadTask(task,execInst);// no throw of this method - all throw are catched !
1149   return 0;
1150 }
1151
1152 //! Function to perform execution of a task in a thread
1153 /*!
1154  *  \param arg  : 3 elements (a Task, a Scheduler, an Executor)
1155  *
1156  *  Calls Task::execute
1157  *
1158  *  Calls Task::finished when the task is finished
1159  *
1160  *  Calls (notify with event YACS::FINISH) Scheduler::notifyFrom when the task is finished
1161  *
1162  *  Calls Executor::wakeUp and Executor::notifyEndOfThread
1163  */
1164
1165 void *Executor::functionForTaskExecution(void *arg)
1166 {
1167   DEBTRACE("Executor::functionForTaskExecution(void *arg)");
1168
1169   struct threadargs *args = (struct threadargs *) arg;
1170   Task *task=args->task;
1171   Scheduler *sched=args->sched;
1172   Executor *execInst=args->execInst;
1173   delete args;
1174   execInst->traceExec(task, "state:"+Node::getStateName(task->getState()),ComputePlacement(task));
1175
1176   Thread::detach();
1177
1178   // Execute task
1179
1180   if(execInst->getDPLScopeSensitive())
1181     {
1182       Node *node(dynamic_cast<Node *>(task));
1183       ComposedNode *gfn(dynamic_cast<ComposedNode *>(sched));
1184       if(node!=0 && gfn!=0)
1185         node->applyDPLScope(gfn);
1186     }
1187
1188   YACS::Event ev=YACS::FINISH;
1189   try
1190     {
1191       execInst->traceExec(task, "start execution",ComputePlacement(task));
1192       task->execute();
1193       execInst->traceExec(task, "end execution OK",ComputePlacement(task));
1194     }
1195   catch(Exception& ex)
1196     {
1197       std::cerr << "YACS Exception during execute" << std::endl;
1198       std::cerr << ex.what() << std::endl;
1199       ev=YACS::ABORT;
1200       string message = "end execution ABORT, ";
1201       message += ex.what();
1202       execInst->traceExec(task, message,ComputePlacement(task));
1203     }
1204   catch(...)
1205     {
1206       // Execution has failed
1207       std::cerr << "Execution has failed: unknown reason" << std::endl;
1208       ev=YACS::ABORT;
1209       execInst->traceExec(task, "end execution ABORT, unknown reason",ComputePlacement(task));
1210     }
1211
1212   // Disconnect task
1213   try
1214     {
1215       DEBTRACE("task->disconnectService()");
1216       task->disconnectService();
1217       execInst->traceExec(task, "disconnectService",ComputePlacement(task));
1218     }
1219   catch(...)
1220     {
1221       // Disconnect has failed
1222       std::cerr << "disconnect has failed" << std::endl;
1223       ev=YACS::ABORT;
1224       execInst->traceExec(task, "disconnectService failed, ABORT",ComputePlacement(task));
1225     }
1226   //
1227
1228   std::string placement(ComputePlacement(task));
1229
1230   // container management for HomogeneousPoolOfContainer
1231
1232   HomogeneousPoolContainer *contC(dynamic_cast<HomogeneousPoolContainer *>(task->getContainer()));
1233   if(contC)
1234     {
1235       std::lock_guard<std::mutex> alckCont(contC->getLocker());
1236       contC->release(task);
1237     }
1238
1239   DEBTRACE("End task->execute()");
1240   { // --- Critical section
1241     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&execInst->_mutexForSchedulerUpdate);
1242     try
1243       {
1244         if (ev == YACS::FINISH) task->finished();
1245         if (ev == YACS::ABORT)
1246           {
1247             execInst->_errorDetected = true;
1248             if (execInst->_stopOnErrorRequested)
1249               {
1250                 execInst->_execMode = YACS::STEPBYSTEP;
1251                 execInst->_isOKToEnd = true;
1252               }
1253             task->aborted();
1254           }
1255         execInst->traceExec(task, "state:"+Node::getStateName(task->getState()),placement);
1256         sched->notifyFrom(task,ev,execInst);
1257       }
1258     catch(Exception& ex)
1259       {
1260         //notify has failed : it is supposed to have set state
1261         //so no need to do anything
1262         std::cerr << "Error during notification" << std::endl;
1263         std::cerr << ex.what() << std::endl;
1264       }
1265     catch(...)
1266       {
1267         //notify has failed : it is supposed to have set state
1268         //so no need to do anything
1269         std::cerr << "Notification failed" << std::endl;
1270       }
1271     execInst->_numberOfRunningTasks--;
1272     execInst->_runningTasks.erase(task);
1273     DEBTRACE("_numberOfRunningTasks: " << execInst->_numberOfRunningTasks
1274              << " _execMode: " << execInst->_execMode
1275              << " _executorState: " << execInst->_executorState);
1276     if ((execInst->_numberOfRunningTasks == 0) && (execInst->_execMode != YACS::CONTINUE)) // no more running tasks
1277       {
1278         if (execInst->_executorState == YACS::WAITINGTASKS)
1279           {
1280             execInst->_executorState = YACS::PAUSED;
1281             execInst->sendEvent("executor");
1282             execInst->_condForPilot.notify_all();
1283             if (execInst->_errorDetected &&
1284                 execInst->_stopOnErrorRequested &&
1285                 !execInst->_isRunningunderExternalControl)
1286               execInst->_condForStepByStep.notify_all(); // exec thread may be on waitResume
1287           }
1288       }
1289     DEBTRACE("before _semForMaxThreads.post " << execInst->_semThreadCnt);
1290     execInst->_semForMaxThreads.post();
1291     execInst->_semThreadCnt += 1;
1292     DEBTRACE("after _semForMaxThreads.post " << execInst->_semThreadCnt);
1293     if (execInst->_executorState != YACS::PAUSED)  execInst->wakeUp();
1294
1295   } // --- End of critical section (change state)
1296
1297   Thread::exit(0);
1298   return 0;
1299 }
1300
1301 void Executor::traceExec(Task *task, const std::string& message, const std::string& placement)
1302 {
1303   string nodeName = _mainSched->getTaskName(task);
1304   Container *cont = task->getContainer();
1305   string containerName = "---";
1306   if (cont)
1307     containerName = cont->getName();
1308
1309   std::chrono::steady_clock::time_point now = std::chrono::steady_clock::now();
1310   std::chrono::milliseconds millisec;
1311   millisec = std::chrono::duration_cast<std::chrono::milliseconds>(now -_start);
1312   double elapse = double(millisec.count()) / 1000.0;
1313   {
1314     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForTrace);
1315     _trace << elapse << " " << containerName << " " << placement << " " << nodeName << " " << message << endl;
1316     _trace << flush;
1317   }
1318 }
1319
1320 //! emit notification to all observers registered with  the dispatcher
1321 /*!
1322  * The dispatcher is unique and can be obtained by getDispatcher()
1323  */
1324 void Executor::sendEvent(const std::string& event)
1325 {
1326   Dispatcher* disp=Dispatcher::getDispatcher();
1327   YASSERT(disp);
1328   YASSERT(_root);
1329   disp->dispatch(_root,event);
1330 }
1331
1332 struct HPCCompare
1333 {
1334   bool operator()(HomogeneousPoolContainer * lhs, HomogeneousPoolContainer * rhs) const
1335   {
1336     if(!lhs && !rhs)
1337       return false;
1338     if(!lhs)
1339       return true;
1340     if(!rhs)
1341       return false;
1342     return lhs->getNumberOfCoresPerWorker() < rhs->getNumberOfCoresPerWorker();
1343   }
1344 };
1345
1346 /*!
1347  * This method takes in input a list of tasks and selects from that lists a part of it considering only the containers.
1348  * If tasks have no container instance subclass of HomogeneousPoolContainer this method will let the \a tsks untouched.
1349  *
1350  * \param [in,out] tsks - list of tasks to be
1351  */
1352 void Executor::filterTasksConsideringContainers(std::vector<Task *>& tsks)
1353 {
1354   std::map<HomogeneousPoolContainer *, std::vector<Task *>, HPCCompare > m;
1355   for(auto cur : tsks)
1356     {
1357       if(!cur)
1358         continue;
1359       Container *cont(cur->getContainer());
1360       if(!cont)
1361         {
1362           m[nullptr].push_back(cur);
1363           continue;
1364         }
1365       HomogeneousPoolContainer *contC(dynamic_cast<HomogeneousPoolContainer *>(cont));
1366       if(!contC)
1367         {
1368           m[nullptr].push_back(cur);
1369           continue;
1370         }
1371       m[contC].push_back(cur);
1372     }
1373   //
1374   std::vector<Task *> ret;
1375   for(auto it : m)
1376     {
1377       HomogeneousPoolContainer *curhpc(it.first);
1378       const std::vector<Task *>& curtsks(it.second);
1379       if(!curhpc)
1380         {
1381           std::uint32_t nbThreadsRunning = _runningTasks.size();
1382           std::uint32_t nbOfFreeSpace = _maxNbThreads - min(_maxNbThreads,nbThreadsRunning);
1383           std::uint32_t nbOfCandidates = static_cast<std::uint32_t>( curtsks.size() );
1384           std::uint32_t nbOfCandidatesToBeLaunched = std::min(nbOfCandidates,nbOfFreeSpace);
1385           DEBTRACE("nb threads running: " << nbThreadsRunning);
1386           DEBTRACE("MaxNbThreads: " << _maxNbThreads);
1387           DEBTRACE("nbOfFreeSpace: " << nbOfFreeSpace);
1388           DEBTRACE("nbOfCandidates: " << nbOfCandidates);
1389           DEBTRACE("nbOfCandidatesToBeLaunched: " << nbOfCandidatesToBeLaunched);
1390           ret.insert(ret.end(),curtsks.begin(),curtsks.begin() + nbOfCandidatesToBeLaunched);
1391         }
1392       else
1393         {
1394           // start of critical section for container curhpc
1395           std::lock_guard<std::mutex> alckCont(curhpc->getLocker());
1396           std::vector<const Task *> vecOfTaskSharingSameHPContToBeRunSimutaneously;
1397           std::size_t sz(curhpc->getNumberOfFreePlace());
1398           std::vector<Task *>::const_iterator it2(curtsks.begin());
1399           for(std::size_t i=0;i<sz && it2!=curtsks.end();i++,it2++)
1400             {
1401               vecOfTaskSharingSameHPContToBeRunSimutaneously.push_back(*it2);
1402               ret.push_back(*it2);
1403             }
1404           curhpc->allocateFor(vecOfTaskSharingSameHPContToBeRunSimutaneously);
1405           //end of critical section
1406         }
1407     }
1408   //
1409   tsks=ret;
1410 }
1411
1412 std::string Executor::ComputePlacement(Task *zeTask)
1413 {
1414   std::string placement("---");
1415   if(!zeTask)
1416     return placement;
1417   if(zeTask->getContainer())
1418     placement=zeTask->getContainer()->getFullPlacementId(zeTask);
1419   return placement;
1420 }
1421
1422 ///////// NEW EXECUTOR ////////////////////////////////
1423 void Executor::loadTask(Task *task, const WorkloadManager::RunInfo& runInfo)
1424 {
1425   if(task->getState() != YACS::TOLOAD)
1426     return;
1427   traceExec(task, "state:TOLOAD", ComputePlacement(task));
1428   {//Critical section
1429     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1430     _mainSched->notifyFrom(task,YACS::START,this);
1431   }//End of critical section
1432   try
1433     {
1434       std::ostringstream container_name;
1435       container_name << runInfo.type.name << "-" << runInfo.index;
1436       task->imposeResource(runInfo.resource.name, container_name.str());
1437       traceExec(task, "load", ComputePlacement(task));
1438       task->load();
1439       traceExec(task, "initService", ComputePlacement(task));
1440       task->initService();
1441     }
1442   catch(Exception& ex)
1443     {
1444       std::cerr << ex.what() << std::endl;
1445       {//Critical section
1446         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1447         task->aborted();
1448         _mainSched->notifyFrom(task,YACS::ABORT, this);
1449         traceExec(task, "state:"+Node::getStateName(task->getState()), ComputePlacement(task));
1450       }//End of critical section
1451     }
1452   catch(...)
1453     {
1454       std::cerr << "Load failed" << std::endl;
1455       {//Critical section
1456         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1457         task->aborted();
1458         _mainSched->notifyFrom(task,YACS::ABORT, this);
1459         traceExec(task, "state:"+Node::getStateName(task->getState()), ComputePlacement(task));
1460       }//End of critical section
1461     }
1462 }
1463
1464 void Executor::beginTask(Task *task)
1465 {
1466   // --- Critical section
1467   YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1468   _numberOfRunningTasks++;
1469   _runningTasks.insert(task);
1470   // --- End of critical section
1471 }
1472
1473 void Executor::endTask(Task *task, YACS::Event ev)
1474 {
1475   YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1476   try
1477   {
1478     if (ev == YACS::FINISH) task->finished();
1479     if (ev == YACS::ABORT)
1480     {
1481       _errorDetected = true;
1482       if (_stopOnErrorRequested)
1483       {
1484         _execMode = YACS::STEPBYSTEP;
1485         _isOKToEnd = true;
1486       }
1487       task->aborted();
1488     }
1489     //traceExec(task, "state:"+Node::getStateName(task->getState()),placement);
1490     _mainSched->notifyFrom(task,ev,this);
1491   }
1492   catch(Exception& ex)
1493   {
1494     //notify has failed : it is supposed to have set state
1495     //so no need to do anything
1496     std::cerr << "Error during notification" << std::endl;
1497     std::cerr << ex.what() << std::endl;
1498   }
1499   catch(...)
1500   {
1501     //notify has failed : it is supposed to have set state
1502     //so no need to do anything
1503     std::cerr << "Notification failed" << std::endl;
1504   }
1505   _numberOfRunningTasks--;
1506   _runningTasks.erase(task);
1507   if ((_numberOfRunningTasks == 0) && (_execMode != YACS::CONTINUE)) // no more running tasks
1508     {
1509       if (_executorState == YACS::WAITINGTASKS)
1510         {
1511           _executorState = YACS::PAUSED;
1512           sendEvent("executor");
1513           _condForPilot.notify_all();
1514           if (_errorDetected &&
1515               _stopOnErrorRequested &&
1516               !_isRunningunderExternalControl)
1517             _condForStepByStep.notify_all(); // exec thread may be on waitResume
1518         }
1519     }
1520   if (_executorState != YACS::PAUSED)
1521     wakeUp();
1522 }
1523
1524 void Executor::failTask(Task *task, const std::string& message)
1525 {
1526   ElementaryNode* elemNode = dynamic_cast<ElementaryNode*>(task);
1527   if(elemNode != nullptr)
1528   {
1529     StateLoader(elemNode, YACS::ERROR);
1530     elemNode->setErrorDetails(message);
1531   }
1532   endTask(task, YACS::ABORT);
1533 }
1534
1535 YACS::Event  Executor::runTask(Task *task)
1536 {
1537   { // --- Critical section
1538     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1539     task->begin(); //change state to ACTIVATED
1540   }
1541   traceExec(task, "state:"+Node::getStateName(task->getState()),ComputePlacement(task));
1542
1543   if(getDPLScopeSensitive())
1544     {
1545       Node *node(dynamic_cast<Node *>(task));
1546       ComposedNode *gfn(dynamic_cast<ComposedNode *>(_mainSched));
1547       if(node!=0 && gfn!=0)
1548         node->applyDPLScope(gfn);
1549     }
1550
1551   YACS::Event ev=YACS::FINISH;
1552   try
1553     {
1554       traceExec(task, "start execution",ComputePlacement(task));
1555       task->execute();
1556       traceExec(task, "end execution OK",ComputePlacement(task));
1557     }
1558   catch(Exception& ex)
1559     {
1560       std::cerr << "YACS Exception during execute" << std::endl;
1561       std::cerr << ex.what() << std::endl;
1562       ev=YACS::ABORT;
1563       string message = "end execution ABORT, ";
1564       message += ex.what();
1565       traceExec(task, message,ComputePlacement(task));
1566     }
1567   catch(...)
1568     {
1569       // Execution has failed
1570       std::cerr << "Execution has failed: unknown reason" << std::endl;
1571       ev=YACS::ABORT;
1572       traceExec(task, "end execution ABORT, unknown reason",ComputePlacement(task));
1573     }
1574
1575   // Disconnect task
1576   try
1577     {
1578       DEBTRACE("task->disconnectService()");
1579       task->disconnectService();
1580       traceExec(task, "disconnectService",ComputePlacement(task));
1581     }
1582   catch(...)
1583     {
1584       // Disconnect has failed
1585       std::cerr << "disconnect has failed" << std::endl;
1586       ev=YACS::ABORT;
1587       traceExec(task, "disconnectService failed, ABORT",ComputePlacement(task));
1588     }
1589   //
1590
1591   std::string placement(ComputePlacement(task));
1592
1593   // container management for HomogeneousPoolOfContainer
1594
1595   HomogeneousPoolContainer *contC(dynamic_cast<HomogeneousPoolContainer *>(task->getContainer()));
1596   if(contC)
1597   {
1598     std::lock_guard<std::mutex> alckCont(contC->getLocker());
1599     contC->release(task);
1600   }
1601
1602   return ev;
1603 }
1604
1605 void Executor::makeDatastreamConnections(Task *task)
1606 {
1607   YACS::StatesForNode state=task->getState();
1608   if(state != YACS::TOLOAD && state != YACS::TORECONNECT)
1609     return;
1610   try
1611     {
1612       task->connectService();
1613       traceExec(task, "connectService",ComputePlacement(task));
1614       {//Critical section
1615         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1616         task->connected();
1617       }//End of critical section
1618     }
1619   catch(Exception& ex)
1620     {
1621       std::cerr << ex.what() << std::endl;
1622       try
1623         {
1624           (task)->disconnectService();
1625           traceExec(task, "disconnectService",ComputePlacement(task));
1626         }
1627       catch(...)
1628         {
1629           // Disconnect has failed
1630           traceExec(task, "disconnectService failed, ABORT",ComputePlacement(task));
1631         }
1632       {//Critical section
1633         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1634         task->aborted();
1635         _mainSched->notifyFrom(task,YACS::ABORT,this);
1636       }//End of critical section
1637     }
1638   catch(...)
1639     {
1640       std::cerr << "Problem in connectService" << std::endl;
1641       try
1642         {
1643           (task)->disconnectService();
1644           traceExec(task, "disconnectService",ComputePlacement(task));
1645         }
1646       catch(...)
1647         {
1648           // Disconnect has failed
1649           traceExec(task, "disconnectService failed, ABORT",ComputePlacement(task));
1650         }
1651       {//Critical section
1652         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1653         task->aborted();
1654         _mainSched->notifyFrom(task,YACS::ABORT,this);
1655       }//End of critical section
1656     }
1657   if(task->getState() == YACS::ERROR)
1658     {
1659       //try to put all coupled tasks in error
1660       std::set<Task*> coupledSet;
1661       task->getCoupledTasks(coupledSet);
1662       for (std::set<Task*>::iterator it = coupledSet.begin(); it != coupledSet.end(); ++it)
1663         {
1664           Task* t=*it;
1665           if(t == task)continue;
1666           if(t->getState() == YACS::ERROR)continue;
1667           try
1668             {
1669               t->disconnectService();
1670               traceExec(t, "disconnectService",ComputePlacement(task));
1671             }
1672           catch(...)
1673             {
1674               // Disconnect has failed
1675               traceExec(t, "disconnectService failed, ABORT",ComputePlacement(task));
1676             }
1677           {//Critical section
1678             YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1679             t->aborted();
1680             _mainSched->notifyFrom(t,YACS::ABORT,this);
1681           }//End of critical section
1682           traceExec(t, "state:"+Node::getStateName(t->getState()),ComputePlacement(task));
1683         }
1684     }
1685   traceExec(task, "state:"+Node::getStateName(task->getState()),ComputePlacement(task));
1686 }
1687
1688 void Executor::runWlm(Scheduler *graph,int debug, bool fromScratch)
1689 {
1690   DEBTRACE("Executor::runWlm debug: "<< graph->getName() <<" "<< debug<<" fromScratch: "<<fromScratch);
1691   { // --- Critical section
1692     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1693     _mainSched = graph;
1694     _root = dynamic_cast<ComposedNode *>(_mainSched);
1695     if (!_root) throw Exception("Executor::Run, Internal Error!");
1696     _executorState = YACS::NOTYETINITIALIZED;
1697     sendEvent("executor");
1698     _toContinue=true;
1699     _isOKToEnd = false;
1700     _errorDetected = false;
1701     _isWaitingEventsFromRunningTasks = false;
1702     _numberOfRunningTasks = 0;
1703     _runningTasks.clear();
1704     _numberOfEndedTasks = 0;
1705     string tracefile = "traceExec_";
1706     tracefile += _mainSched->getName();
1707     _trace.open(tracefile.c_str());
1708     _start = std::chrono::steady_clock::now();
1709   } // --- End of critical section
1710
1711   if (debug > 1) _displayDot(graph);
1712
1713   if (fromScratch)
1714     {
1715       try
1716         {
1717           graph->init();
1718           graph->exUpdateState();
1719         }
1720       catch(Exception& ex)
1721         {
1722           DEBTRACE("exception: "<< (ex.what()));
1723           _executorState = YACS::FINISHED;
1724           sendEvent("executor");
1725           throw;
1726         }
1727     }
1728   _executorState = YACS::INITIALISED;
1729   sendEvent("executor");
1730
1731   if (debug > 1) _displayDot(graph);
1732
1733   bool isMore;
1734   int problemCount=0;
1735   int numberAllTasks;
1736
1737   _executorState = YACS::RUNNING;
1738   sendEvent("executor");
1739
1740   WorkloadManager::DefaultAlgorithm algo;
1741   WorkloadManager::WorkloadManager wlm(algo);
1742   WlmTask::loadResources(wlm);
1743   wlm.start();
1744
1745   while (_toContinue)
1746     {
1747       DEBTRACE("--- executor main loop");
1748       sleepWhileNoEventsFromAnyRunningTask();
1749       DEBTRACE("--- events...");
1750       if (debug > 2) _displayDot(graph);
1751       { // --- Critical section
1752         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1753         std::vector<Task *> readyTasks=graph->getNextTasks(isMore);
1754         graph->selectRunnableTasks(readyTasks);
1755         _tasks.clear();
1756         for(Task * t : readyTasks)
1757           if(_runningTasks.find(t) == _runningTasks.end())
1758             _tasks.push_back(t);
1759         // TODO: to be removed
1760         filterTasksConsideringContainers(_tasks);
1761         numberAllTasks=_numberOfRunningTasks+_tasks.size();
1762       } // --- End of critical section
1763       if (debug > 2) _displayDot(graph);
1764       DEBTRACE("--- events...");
1765       if (_executorState == YACS::RUNNING)
1766       {
1767         if (checkBreakPoints()) break; // end of thread requested, OK to exit at once;
1768         for(Task * task : _tasks)
1769         {
1770           beginTask(task);
1771           WlmTask* newTask = new WlmTask(*this, task);
1772           wlm.addTask(newTask);
1773         }
1774       }
1775       if (debug > 1) _displayDot(graph);
1776       { // --- Critical section
1777         DEBTRACE("---");
1778         YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1779         //It is possible that the graph is finished but it remains running tasks (it's an error but we must take it into account)
1780         _toContinue = !graph->isFinished();
1781
1782         DEBTRACE("_numberOfRunningTasks: " << _numberOfRunningTasks);
1783         DEBTRACE("_numberOfEndedTasks: " << _numberOfEndedTasks);
1784         DEBTRACE("_toContinue: " << _toContinue);
1785         if(_toContinue && numberAllTasks==0)
1786         {
1787           //Problem : no running tasks and no task to launch ??
1788           problemCount++;
1789           std::cerr << "Problem in Executor : no running tasks and no task to launch ?? problemCount=" << problemCount << std::endl;
1790           //Pause to give a chance to interrupt
1791           usleep(1000);
1792           if(problemCount > 25)
1793           {
1794             // Too much problems encountered : stop execution
1795             _toContinue=false;
1796           }
1797         }
1798
1799         if (! _toContinue)
1800           {
1801             _executorState = YACS::FINISHED;
1802             sendEvent("executor");
1803             _condForPilot.notify_all();
1804           }
1805       } // --- End of critical section
1806       if (debug > 0) _displayDot(graph);
1807       DEBTRACE("_toContinue: " << _toContinue);
1808     }
1809
1810   wlm.stop();
1811   DEBTRACE("End of main Loop");
1812
1813   { // --- Critical section
1814     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForSchedulerUpdate);
1815     if ( _toContinue) // --- break while(): request to stop detected on checkBreakPoints()
1816       {
1817         DEBTRACE("stop requested: End soon");
1818         _executorState = YACS::STOPPED;
1819         _toContinue = false;
1820         sendEvent("executor");
1821       }
1822   } // --- End of critical section
1823   if ( _dumpOnErrorRequested && _errorDetected)
1824     {
1825       saveState(_dumpErrorFile);
1826     }
1827   {
1828     YACS::BASES::AutoLocker<YACS::BASES::Mutex> alck(&_mutexForTrace);
1829     _trace.close();
1830   }
1831 }
1832
1833 void Executor::RunW(Scheduler *graph,int debug, bool fromScratch)
1834 {
1835   std::string str_value = graph->getProperty("executor");
1836   if(str_value == "WorkloadManager"
1837      || str_value == "WORKLOADMANAGER"
1838      || str_value == "workloadmanager"
1839      || str_value == "WorkLoadManager")
1840     runWlm(graph, debug, fromScratch);
1841   else
1842     RunB(graph, debug, fromScratch);
1843 }