Actual source code: viewreg.c
petsc-3.13.6 2020-09-29
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      2:  #include <petsc/private/viewerimpl.h>
      3:  #include <petsc/private/hashtable.h>
      4: #if defined(PETSC_HAVE_SAWS)
      5:  #include <petscviewersaws.h>
      6: #endif

      8: PetscFunctionList PetscViewerList = NULL;

     11: PetscOptionsHelpPrinted PetscOptionsHelpPrintedSingleton = NULL;
     12: KHASH_SET_INIT_STR(HTPrinted)
     13: struct  _n_PetscOptionsHelpPrinted{
     14:   khash_t(HTPrinted) *printed;
     15:   PetscSegBuffer     strings;
     16: };

     18: PetscErrorCode PetscOptionsHelpPrintedDestroy(PetscOptionsHelpPrinted *hp)
     19: {

     23:   if (!*hp) return(0);
     24:   kh_destroy(HTPrinted,(*hp)->printed);
     25:   PetscSegBufferDestroy(&(*hp)->strings);
     26:   PetscFree(*hp);
     27:   return(0);
     28: }

     30: /*@C
     31:       PetscOptionsHelpPrintedCreate - Creates an object used to manage tracking which help messages have
     32:          been printed so they will not be printed again.

     34:      Not collective

     36:     Level: developer

     38: .seealso: PetscOptionsHelpPrintedCheck(), PetscOptionsHelpPrintChecked()
     39: @*/
     40: PetscErrorCode PetscOptionsHelpPrintedCreate(PetscOptionsHelpPrinted *hp)
     41: {
     42:   PetscErrorCode             ierr;

     45:   PetscNew(hp);
     46:   (*hp)->printed = kh_init(HTPrinted);
     47:   PetscSegBufferCreate(sizeof(char),10000,&(*hp)->strings);
     48:   return(0);
     49: }

     51: /*@C
     52:       PetscOptionsHelpPrintedCheck - Checks if a particular pre, name pair has previous been entered (meaning the help message was printed)

     54:      Not collective

     56:     Input Parameters:
     57: +     hp - the object used to manage tracking what help messages have been printed
     58: .     pre - the prefix part of the string, many be NULL
     59: -     name - the string to look for (cannot be NULL)

     61:     Output Parameter:
     62: .     found - PETSC_TRUE if the string was already set

     64:     Level: intermediate

     67: .seealso: PetscOptionsHelpPrintedCreate()
     68: @*/
     69: PetscErrorCode PetscOptionsHelpPrintedCheck(PetscOptionsHelpPrinted hp,const char *pre,const char* name,PetscBool *found)
     70: {
     71:   size_t          l1,l2;
     72: #if !defined(PETSC_HAVE_THREADSAFETY)
     73:   char            *both;
     74:   int             newitem;
     75: #endif
     76:   PetscErrorCode  ierr;

     79:   PetscStrlen(pre,&l1);
     80:   PetscStrlen(name,&l2);
     81:   if (l1+l2 == 0) {
     82:     *found = PETSC_FALSE;
     83:     return(0);
     84:   }
     85: #if !defined(PETSC_HAVE_THREADSAFETY)
     86:   PetscSegBufferGet(hp->strings,l1+l2+1,&both);
     87:   PetscStrcpy(both,pre);
     88:   PetscStrcat(both,name);
     89:   kh_put(HTPrinted,hp->printed,both,&newitem);
     90:   if (!newitem) {
     91:     PetscSegBufferUnuse(hp->strings,l1+l2+1);
     92:   }
     93:   *found = newitem ? PETSC_FALSE : PETSC_TRUE;
     94: #else
     95:   *found = PETSC_FALSE;
     96: #endif
     97:   return(0);
     98: }

    100: static PetscBool noviewer = PETSC_FALSE;
    101: static PetscBool noviewers[PETSCVIEWERGETVIEWEROFFPUSHESMAX];
    102: static PetscInt  inoviewers = 0;

    104: /*@
    105:   PetscOptionsPushGetViewerOff - control whether PetscOptionsGetViewer returns a viewer.

    107:   Logically Collective

    109:   Input Parameter:
    110: . flg - PETSC_TRUE to turn off viewer creation, PETSC_FALSE to turn it on.

    112:   Level: developer

    114:   Notes:
    115:     Calling XXXViewFromOptions in an inner loop can be very expensive.  This can appear, for example, when using
    116:    many small subsolves.  Call this function to control viewer creation in PetscOptionsGetViewer, thus removing the expensive XXXViewFromOptions calls.

    118: .seealso: PetscOptionsGetViewer(), PetscOptionsPopGetViewerOff()
    119: @*/
    120: PetscErrorCode  PetscOptionsPushGetViewerOff(PetscBool flg)
    121: {
    123:   if (inoviewers > PETSCVIEWERGETVIEWEROFFPUSHESMAX - 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Too many PetscOptionsPushGetViewerOff(), perhaps you forgot PetscOptionsPopGetViewerOff()?");

    125:   noviewers[inoviewers++] = noviewer;
    126:   noviewer = flg;
    127:   return(0);
    128: }

    130: /*@
    131:   PetscOptionsPopGetViewerOff - reset whether PetscOptionsGetViewer returns a viewer.

    133:   Logically Collective

    135:   Level: developer

    137:   Notes:
    138:     Calling XXXViewFromOptions in an inner loop can be very expensive.  This can appear, for example, when using
    139:    many small subsolves.  Call this function to control viewer creation in PetscOptionsGetViewer, thus removing the expensive XXXViewFromOptions calls.

    141: .seealso: PetscOptionsGetViewer(), PetscOptionsPushGetViewerOff()
    142: @*/
    143: PetscErrorCode  PetscOptionsPopGetViewerOff(void)
    144: {
    146:   if (!inoviewers) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Too many PetscOptionsPopGetViewerOff(), perhaps you forgot PetscOptionsPushGetViewerOff()?");
    147:   noviewer = noviewers[--inoviewers];
    148:   return(0);
    149: }

    151: /*@
    152:   PetscOptionsGetViewerOff - does PetscOptionsGetViewer return a viewer?

    154:   Logically Collective

    156:   Output Parameter:
    157: . flg - whether viewers are returned.

    159:   Level: developer

    161:   Notes:
    162:     Calling XXXViewFromOptions in an inner loop can be very expensive.  This can appear, for example, when using
    163:    many small subsolves.

    165: .seealso: PetscOptionsGetViewer(), PetscOptionsPushGetViewerOff(), PetscOptionsPopGetViewerOff()
    166: @*/
    167: PetscErrorCode  PetscOptionsGetViewerOff(PetscBool *flg)
    168: {
    171:   *flg = noviewer;
    172:   return(0);
    173: }

    175: /*@C
    176:    PetscOptionsGetViewer - Gets a viewer appropriate for the type indicated by the user

    178:    Collective

    180:    Input Parameters:
    181: +  comm - the communicator to own the viewer
    182: .  pre - the string to prepend to the name or NULL
    183: -  name - the option one is seeking

    185:    Output Parameter:
    186: +  viewer - the viewer, pass NULL if not needed
    187: .  format - the PetscViewerFormat requested by the user, pass NULL if not needed
    188: -  set - PETSC_TRUE if found, else PETSC_FALSE

    190:    Level: intermediate

    192:    Notes:
    193:     If no value is provided ascii:stdout is used
    194: $       ascii[:[filename][:[format][:append]]]    defaults to stdout - format can be one of ascii_info, ascii_info_detail, or ascii_matlab,
    195:                                                   for example ascii::ascii_info prints just the information about the object not all details
    196:                                                   unless :append is given filename opens in write mode, overwriting what was already there
    197: $       binary[:[filename][:[format][:append]]]   defaults to the file binaryoutput
    198: $       draw[:drawtype[:filename]]                for example, draw:tikz, draw:tikz:figure.tex  or draw:x
    199: $       socket[:port]                             defaults to the standard output port
    200: $       saws[:communicatorname]                    publishes object to the Scientific Application Webserver (SAWs)

    202:    Use PetscViewerDestroy() after using the viewer, otherwise a memory leak will occur

    204:    You can control whether calls to this function create a viewer (or return early with *set of PETSC_FALSE) with
    205:    PetscOptionsPushGetViewerOff.  This is useful if calling many small subsolves, in which case XXXViewFromOptions can take
    206:    an appreciable fraction of the runtime.

    208:    If PETSc is configured with --with-viewfromoptions=0 this function always returns with *set of PETSC_FALSE

    210: .seealso: PetscOptionsGetReal(), PetscOptionsHasName(), PetscOptionsGetString(),
    211:           PetscOptionsGetIntArray(), PetscOptionsGetRealArray(), PetscOptionsBool()
    212:           PetscOptionsInt(), PetscOptionsString(), PetscOptionsReal(), PetscOptionsBool(),
    213:           PetscOptionsName(), PetscOptionsBegin(), PetscOptionsEnd(), PetscOptionsHead(),
    214:           PetscOptionsStringArray(),PetscOptionsRealArray(), PetscOptionsScalar(),
    215:           PetscOptionsBoolGroupBegin(), PetscOptionsBoolGroup(), PetscOptionsBoolGroupEnd(),
    216:           PetscOptionsFList(), PetscOptionsEList(), PetscOptionsPushGetViewerOff(), PetscOptionsPopGetViewerOff(),
    217:           PetscOptionsGetViewerOff()
    218: @*/
    219: PetscErrorCode  PetscOptionsGetViewer(MPI_Comm comm,PetscOptions options,const char pre[],const char name[],PetscViewer *viewer,PetscViewerFormat *format,PetscBool  *set)
    220: {
    221:   const char                     *value;
    222:   PetscErrorCode                 ierr;
    223:   PetscBool                      flag,hashelp;

    228:   if (viewer) *viewer = NULL;
    229:   if (format) *format = PETSC_VIEWER_DEFAULT;
    230:   if (set)    *set    = PETSC_FALSE;
    231:   PetscOptionsGetViewerOff(&flag);
    232:   if (flag) return(0);

    234:   PetscOptionsHasHelp(NULL,&hashelp);
    235:   if (hashelp) {
    236:     PetscBool found;

    238:     if (!PetscOptionsHelpPrintedSingleton) {
    239:       PetscOptionsHelpPrintedCreate(&PetscOptionsHelpPrintedSingleton);
    240:     }
    241:     PetscOptionsHelpPrintedCheck(PetscOptionsHelpPrintedSingleton,pre,name,&found);
    242:     if (!found && viewer) {
    243:       (*PetscHelpPrintf)(comm,"----------------------------------------\nViewer (-%s%s) options:\n",pre ? pre : "",name+1);
    244:       (*PetscHelpPrintf)(comm,"  -%s%s ascii[:[filename][:[format][:append]]]: %s (%s)\n",pre ? pre : "",name+1,"Prints object to stdout or ASCII file","PetscOptionsGetViewer");
    245:       (*PetscHelpPrintf)(comm,"  -%s%s binary[:[filename][:[format][:append]]]: %s (%s)\n",pre ? pre : "",name+1,"Saves object to a binary file","PetscOptionsGetViewer");
    246:       (*PetscHelpPrintf)(comm,"  -%s%s draw[:[drawtype][:filename|format]] %s (%s)\n",pre ? pre : "",name+1,"Draws object","PetscOptionsGetViewer");
    247:       (*PetscHelpPrintf)(comm,"  -%s%s socket[:port]: %s (%s)\n",pre ? pre : "",name+1,"Pushes object to a Unix socket","PetscOptionsGetViewer");
    248:       (*PetscHelpPrintf)(comm,"  -%s%s saws[:communicatorname]: %s (%s)\n",pre ? pre : "",name+1,"Publishes object to SAWs","PetscOptionsGetViewer");
    249:     }
    250:   }

    252:   if (format) *format = PETSC_VIEWER_DEFAULT;
    253:   PetscOptionsFindPair(options,pre,name,&value,&flag);
    254:   if (flag) {
    255:     if (set) *set = PETSC_TRUE;
    256:     if (!value) {
    257:       if (viewer) {
    258:         PetscViewerASCIIGetStdout(comm,viewer);
    259:         PetscObjectReference((PetscObject)*viewer);
    260:       }
    261:     } else {
    262:       char       *loc0_vtype,*loc1_fname,*loc2_fmt = NULL,*loc3_fmode = NULL;
    263:       PetscInt   cnt;
    264:       const char *viewers[] = {PETSCVIEWERASCII,PETSCVIEWERBINARY,PETSCVIEWERDRAW,PETSCVIEWERSOCKET,PETSCVIEWERMATLAB,PETSCVIEWERSAWS,PETSCVIEWERVTK,PETSCVIEWERHDF5,PETSCVIEWERGLVIS,PETSCVIEWEREXODUSII,NULL};

    266:       PetscStrallocpy(value,&loc0_vtype);
    267:       PetscStrchr(loc0_vtype,':',&loc1_fname);
    268:       if (loc1_fname) {
    269:         *loc1_fname++ = 0;
    270:         PetscStrchr(loc1_fname,':',&loc2_fmt);
    271:       }
    272:       if (loc2_fmt) {
    273:         *loc2_fmt++ = 0;
    274:         PetscStrchr(loc2_fmt,':',&loc3_fmode);
    275:       }
    276:       if (loc3_fmode) *loc3_fmode++ = 0;
    277:       PetscStrendswithwhich(*loc0_vtype ? loc0_vtype : "ascii",viewers,&cnt);
    278:       if (cnt > (PetscInt) sizeof(viewers)-1) SETERRQ1(comm,PETSC_ERR_ARG_OUTOFRANGE,"Unknown viewer type: %s",loc0_vtype);
    279:       if (viewer) {
    280:         if (!loc1_fname) {
    281:           switch (cnt) {
    282:           case 0:
    283:             PetscViewerASCIIGetStdout(comm,viewer);
    284:             break;
    285:           case 1:
    286:             if (!(*viewer = PETSC_VIEWER_BINARY_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    287:             break;
    288:           case 2:
    289:             if (!(*viewer = PETSC_VIEWER_DRAW_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    290:             break;
    291: #if defined(PETSC_USE_SOCKET_VIEWER)
    292:           case 3:
    293:             if (!(*viewer = PETSC_VIEWER_SOCKET_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    294:             break;
    295: #endif
    296: #if defined(PETSC_HAVE_MATLAB_ENGINE)
    297:           case 4:
    298:             if (!(*viewer = PETSC_VIEWER_MATLAB_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    299:             break;
    300: #endif
    301: #if defined(PETSC_HAVE_SAWS)
    302:           case 5:
    303:             if (!(*viewer = PETSC_VIEWER_SAWS_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    304:             break;
    305: #endif
    306: #if defined(PETSC_HAVE_HDF5)
    307:           case 7:
    308:             if (!(*viewer = PETSC_VIEWER_HDF5_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    309:             break;
    310: #endif
    311:           case 8:
    312:             if (!(*viewer = PETSC_VIEWER_GLVIS_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    313:             break;
    314: #if defined(PETSC_HAVE_EXODUSII)
    315:           case 9:
    316:             if (!(*viewer = PETSC_VIEWER_EXODUSII_(comm))) CHKERRQ(PETSC_ERR_PLIB);
    317:             break;
    318: #endif
    319:           default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported viewer %s",loc0_vtype);
    320:           }
    321:           PetscObjectReference((PetscObject)*viewer);
    322:         } else {
    323:           if (loc2_fmt && !*loc1_fname && (cnt == 0)) { /* ASCII format without file name */
    324:             PetscViewerASCIIGetStdout(comm,viewer);
    325:             PetscObjectReference((PetscObject)*viewer);
    326:           } else {
    327:             PetscFileMode fmode;
    328:             PetscViewerCreate(comm,viewer);
    329:             PetscViewerSetType(*viewer,*loc0_vtype ? loc0_vtype : "ascii");
    330:             fmode = FILE_MODE_WRITE;
    331:             if (loc3_fmode && *loc3_fmode) { /* Has non-empty file mode ("write" or "append") */
    332:               PetscEnumFind(PetscFileModes,loc3_fmode,(PetscEnum*)&fmode,&flag);
    333:               if (!flag) SETERRQ1(comm,PETSC_ERR_ARG_UNKNOWN_TYPE,"Unknown file mode: %s",loc3_fmode);
    334:             }
    335:             if (loc2_fmt) {
    336:               PetscBool tk,im;
    337:               PetscStrcmp(loc1_fname,"tikz",&tk);
    338:               PetscStrcmp(loc1_fname,"image",&im);
    339:               if (tk || im) {
    340:                 PetscViewerDrawSetInfo(*viewer,NULL,loc2_fmt,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE);
    341:                 *loc2_fmt = 0;
    342:               }
    343:             }
    344:             PetscViewerFileSetMode(*viewer,flag?fmode:FILE_MODE_WRITE);
    345:             PetscViewerFileSetName(*viewer,loc1_fname);
    346:             if (*loc1_fname) {
    347:               PetscViewerDrawSetDrawType(*viewer,loc1_fname);
    348:             }
    349:             PetscViewerSetFromOptions(*viewer);
    350:           }
    351:         }
    352:       }
    353:       if (viewer) {
    354:         PetscViewerSetUp(*viewer);
    355:       }
    356:       if (loc2_fmt && *loc2_fmt) {
    357:         PetscViewerFormat tfmt;

    359:         PetscEnumFind(PetscViewerFormats,loc2_fmt,(PetscEnum*)&tfmt,&flag);
    360:         if (format) *format = tfmt;
    361:         if (!flag) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unknown viewer format %s",loc2_fmt);
    362:       } else if (viewer && (cnt == 6) && format) { /* Get format from VTK viewer */
    363:         PetscViewerGetFormat(*viewer,format);
    364:       }
    365:       PetscFree(loc0_vtype);
    366:     }
    367:   }
    368:   return(0);
    369: }

    371: /*@
    372:    PetscViewerCreate - Creates a viewing context

    374:    Collective

    376:    Input Parameter:
    377: .  comm - MPI communicator

    379:    Output Parameter:
    380: .  inviewer - location to put the PetscViewer context

    382:    Level: advanced

    384: .seealso: PetscViewerDestroy(), PetscViewerSetType(), PetscViewerType

    386: @*/
    387: PetscErrorCode  PetscViewerCreate(MPI_Comm comm,PetscViewer *inviewer)
    388: {
    389:   PetscViewer    viewer;

    393:   *inviewer = NULL;
    394:   PetscViewerInitializePackage();
    395:   PetscHeaderCreate(viewer,PETSC_VIEWER_CLASSID,"PetscViewer","PetscViewer","Viewer",comm,PetscViewerDestroy,PetscViewerView);
    396:   *inviewer    = viewer;
    397:   viewer->data = NULL;
    398:   return(0);
    399: }

    401: /*@C
    402:    PetscViewerSetType - Builds PetscViewer for a particular implementation.

    404:    Collective on PetscViewer

    406:    Input Parameter:
    407: +  viewer      - the PetscViewer context
    408: -  type        - for example, PETSCVIEWERASCII

    410:    Options Database Command:
    411: .  -viewer_type  <type> - Sets the type; use -help for a list
    412:     of available methods (for instance, ascii)

    414:    Level: advanced

    416:    Notes:
    417:    See "include/petscviewer.h" for available methods (for instance,
    418:    PETSCVIEWERSOCKET)

    420: .seealso: PetscViewerCreate(), PetscViewerGetType(), PetscViewerType, PetscViewerPushFormat()
    421: @*/
    422: PetscErrorCode  PetscViewerSetType(PetscViewer viewer,PetscViewerType type)
    423: {
    424:   PetscErrorCode ierr,(*r)(PetscViewer);
    425:   PetscBool      match;

    430:   PetscObjectTypeCompare((PetscObject)viewer,type,&match);
    431:   if (match) return(0);

    433:   /* cleanup any old type that may be there */
    434:   if (viewer->data) {
    435:     (*viewer->ops->destroy)(viewer);

    437:     viewer->ops->destroy = NULL;
    438:     viewer->data         = NULL;
    439:   }
    440:   PetscMemzero(viewer->ops,sizeof(struct _PetscViewerOps));

    442:    PetscFunctionListFind(PetscViewerList,type,&r);
    443:   if (!r) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_UNKNOWN_TYPE,"Unknown PetscViewer type given: %s",type);

    445:   PetscObjectChangeTypeName((PetscObject)viewer,type);
    446:   (*r)(viewer);
    447:   return(0);
    448: }

    450: /*@C
    451:    PetscViewerRegister - Adds a viewer

    453:    Not Collective

    455:    Input Parameters:
    456: +  name_solver - name of a new user-defined viewer
    457: -  routine_create - routine to create method context

    459:    Level: developer
    460:    Notes:
    461:    PetscViewerRegister() may be called multiple times to add several user-defined viewers.

    463:    Sample usage:
    464: .vb
    465:    PetscViewerRegister("my_viewer_type",MyViewerCreate);
    466: .ve

    468:    Then, your solver can be chosen with the procedural interface via
    469: $     PetscViewerSetType(viewer,"my_viewer_type")
    470:    or at runtime via the option
    471: $     -viewer_type my_viewer_type

    473: .seealso: PetscViewerRegisterAll(), PetscViewerRegisterDestroy()
    474:  @*/
    475: PetscErrorCode  PetscViewerRegister(const char *sname,PetscErrorCode (*function)(PetscViewer))
    476: {

    480:   PetscViewerInitializePackage();
    481:   PetscFunctionListAdd(&PetscViewerList,sname,function);
    482:   return(0);
    483: }

    485: /*@C
    486:    PetscViewerSetFromOptions - Sets the graphics type from the options database.
    487:       Defaults to a PETSc X windows graphics.

    489:    Collective on PetscViewer

    491:    Input Parameter:
    492: .     PetscViewer - the graphics context

    494:    Level: intermediate

    496:    Notes:
    497:     Must be called after PetscViewerCreate() before the PetscViewer is used.

    499: .seealso: PetscViewerCreate(), PetscViewerSetType(), PetscViewerType

    501: @*/
    502: PetscErrorCode  PetscViewerSetFromOptions(PetscViewer viewer)
    503: {
    504:   PetscErrorCode    ierr;
    505:   char              vtype[256];
    506:   PetscBool         flg;

    511:   if (!PetscViewerList) {
    512:     PetscViewerRegisterAll();
    513:   }
    514:   PetscObjectOptionsBegin((PetscObject)viewer);
    515:   PetscOptionsFList("-viewer_type","Type of PetscViewer","None",PetscViewerList,(char*)(((PetscObject)viewer)->type_name ? ((PetscObject)viewer)->type_name : PETSCVIEWERASCII),vtype,256,&flg);
    516:   if (flg) {
    517:     PetscViewerSetType(viewer,vtype);
    518:   }
    519:   /* type has not been set? */
    520:   if (!((PetscObject)viewer)->type_name) {
    521:     PetscViewerSetType(viewer,PETSCVIEWERASCII);
    522:   }
    523:   if (viewer->ops->setfromoptions) {
    524:     (*viewer->ops->setfromoptions)(PetscOptionsObject,viewer);
    525:   }

    527:   /* process any options handlers added with PetscObjectAddOptionsHandler() */
    528:   PetscObjectProcessOptionsHandlers(PetscOptionsObject,(PetscObject)viewer);
    529:   PetscViewerViewFromOptions(viewer,NULL,"-viewer_view");
    530:   PetscOptionsEnd();
    531:   return(0);
    532: }

    534: PetscErrorCode PetscViewerFlowControlStart(PetscViewer viewer,PetscInt *mcnt,PetscInt *cnt)
    535: {
    538:   PetscViewerBinaryGetFlowControl(viewer,mcnt);
    539:   PetscViewerBinaryGetFlowControl(viewer,cnt);
    540:   return(0);
    541: }

    543: PetscErrorCode PetscViewerFlowControlStepMaster(PetscViewer viewer,PetscInt i,PetscInt *mcnt,PetscInt cnt)
    544: {
    546:   MPI_Comm       comm;

    549:   PetscObjectGetComm((PetscObject)viewer,&comm);
    550:   if (i >= *mcnt) {
    551:     *mcnt += cnt;
    552:     MPI_Bcast(mcnt,1,MPIU_INT,0,comm);
    553:   }
    554:   return(0);
    555: }

    557: PetscErrorCode PetscViewerFlowControlEndMaster(PetscViewer viewer,PetscInt *mcnt)
    558: {
    560:   MPI_Comm       comm;
    562:   PetscObjectGetComm((PetscObject)viewer,&comm);
    563:   *mcnt = 0;
    564:   MPI_Bcast(mcnt,1,MPIU_INT,0,comm);
    565:   return(0);
    566: }

    568: PetscErrorCode PetscViewerFlowControlStepWorker(PetscViewer viewer,PetscMPIInt rank,PetscInt *mcnt)
    569: {
    571:   MPI_Comm       comm;
    573:   PetscObjectGetComm((PetscObject)viewer,&comm);
    574:   while (PETSC_TRUE) {
    575:     if (rank < *mcnt) break;
    576:     MPI_Bcast(mcnt,1,MPIU_INT,0,comm);
    577:   }
    578:   return(0);
    579: }

    581: PetscErrorCode PetscViewerFlowControlEndWorker(PetscViewer viewer,PetscInt *mcnt)
    582: {
    584:   MPI_Comm       comm;
    586:   PetscObjectGetComm((PetscObject)viewer,&comm);
    587:   while (PETSC_TRUE) {
    588:     MPI_Bcast(mcnt,1,MPIU_INT,0,comm);
    589:     if (!*mcnt) break;
    590:   }
    591:   return(0);
    592: }