Actual source code: inherit.c

petsc-3.4.0 2013-05-13
  2: /*
  3:      Provides utility routines for manipulating any type of PETSc object.
  4: */
  5: #include <petsc-private/petscimpl.h>  /*I   "petscsys.h"    I*/
  6: #include <petscviewer.h>

  8: PetscObject *PetscObjects      = 0;
  9: PetscInt    PetscObjectsCounts = 0, PetscObjectsMaxCounts = 0;

 11: extern PetscErrorCode PetscObjectGetComm_Petsc(PetscObject,MPI_Comm*);
 12: extern PetscErrorCode PetscObjectCompose_Petsc(PetscObject,const char[],PetscObject);
 13: extern PetscErrorCode PetscObjectQuery_Petsc(PetscObject,const char[],PetscObject*);
 14: extern PetscErrorCode PetscObjectComposeFunction_Petsc(PetscObject,const char[],void (*)(void));
 15: extern PetscErrorCode PetscObjectQueryFunction_Petsc(PetscObject,const char[],void (**)(void));

 19: /*
 20:    PetscHeaderCreate_Private - Creates a base PETSc object header and fills
 21:    in the default values.  Called by the macro PetscHeaderCreate().
 22: */
 23: PetscErrorCode  PetscHeaderCreate_Private(PetscObject h,PetscClassId classid,const char class_name[],const char descr[],const char mansec[],
 24:                                           MPI_Comm comm,PetscErrorCode (*des)(PetscObject*),PetscErrorCode (*vie)(PetscObject,PetscViewer))
 25: {
 26:   static PetscInt idcnt = 1;
 27:   PetscErrorCode  ierr;
 28:   PetscObject     *newPetscObjects;
 29:   PetscInt         newPetscObjectsMaxCounts,i;

 32:   h->classid               = classid;
 33:   h->type                  = 0;
 34:   h->class_name            = (char*)class_name;
 35:   h->description           = (char*)descr;
 36:   h->mansec                = (char*)mansec;
 37:   h->prefix                = 0;
 38:   h->refct                 = 1;
 39: #if defined(PETSC_HAVE_AMS)
 40:   h->amsmem                = -1;
 41: #endif
 42:   h->id                    = idcnt++;
 43:   h->parentid              = 0;
 44:   h->qlist                 = 0;
 45:   h->olist                 = 0;
 46:   h->precision             = (PetscPrecision) sizeof(PetscReal);
 47:   h->bops->destroy         = des;
 48:   h->bops->view            = vie;
 49:   h->bops->getcomm         = PetscObjectGetComm_Petsc;
 50:   h->bops->compose         = PetscObjectCompose_Petsc;
 51:   h->bops->query           = PetscObjectQuery_Petsc;
 52:   h->bops->composefunction = PetscObjectComposeFunction_Petsc;
 53:   h->bops->queryfunction   = PetscObjectQueryFunction_Petsc;

 55:   PetscCommDuplicate(comm,&h->comm,&h->tag);

 57:   /* Keep a record of object created */
 58:   PetscObjectsCounts++;
 59:   for (i=0; i<PetscObjectsMaxCounts; i++) {
 60:     if (!PetscObjects[i]) {
 61:       PetscObjects[i] = h;
 62:       return(0);
 63:     }
 64:   }
 65:   /* Need to increase the space for storing PETSc objects */
 66:   if (!PetscObjectsMaxCounts) newPetscObjectsMaxCounts = 100;
 67:   else                        newPetscObjectsMaxCounts = 2*PetscObjectsMaxCounts;
 68:   PetscMalloc(newPetscObjectsMaxCounts*sizeof(PetscObject),&newPetscObjects);
 69:   PetscMemcpy(newPetscObjects,PetscObjects,PetscObjectsMaxCounts*sizeof(PetscObject));
 70:   PetscMemzero(newPetscObjects+PetscObjectsMaxCounts,(newPetscObjectsMaxCounts - PetscObjectsMaxCounts)*sizeof(PetscObject));
 71:   PetscFree(PetscObjects);

 73:   PetscObjects                        = newPetscObjects;
 74:   PetscObjects[PetscObjectsMaxCounts] = h;
 75:   PetscObjectsMaxCounts               = newPetscObjectsMaxCounts;
 76:   return(0);
 77: }

 79: extern PetscBool      PetscMemoryCollectMaximumUsage;
 80: extern PetscLogDouble PetscMemoryMaximumUsage;

 84: /*
 85:     PetscHeaderDestroy_Private - Destroys a base PETSc object header. Called by
 86:     the macro PetscHeaderDestroy().
 87: */
 88: PetscErrorCode  PetscHeaderDestroy_Private(PetscObject h)
 89: {
 91:   PetscInt       i;

 95:   PetscObjectAMSViewOff(h);
 96:   PetscLogObjectDestroy(h);
 97:   PetscComposedQuantitiesDestroy(h);
 98:   if (PetscMemoryCollectMaximumUsage) {
 99:     PetscLogDouble usage;
100:     PetscMemoryGetCurrentUsage(&usage);
101:     if (usage > PetscMemoryMaximumUsage) PetscMemoryMaximumUsage = usage;
102:   }
103:   /* first destroy things that could execute arbitrary code */
104:   if (h->python_destroy) {
105:     void           *python_context = h->python_context;
106:     PetscErrorCode (*python_destroy)(void*) = h->python_destroy;
107:     h->python_context = 0;
108:     h->python_destroy = 0;

110:     (*python_destroy)(python_context);
111:   }
112:   PetscObjectDestroyOptionsHandlers(h);
113:   PetscObjectListDestroy(&h->olist);
114:   PetscCommDestroy(&h->comm);
115:   /* next destroy other things */
116:   h->classid = PETSCFREEDHEADER;

118:   PetscFree(h->bops);
119:   PetscFunctionListDestroy(&h->qlist);
120:   PetscFree(h->type_name);
121:   PetscFree(h->name);
122:   PetscFree(h->prefix);
123:   PetscFree(h->fortran_func_pointers);
124:   PetscFree(h->fortrancallback[PETSC_FORTRAN_CALLBACK_CLASS]);
125:   PetscFree(h->fortrancallback[PETSC_FORTRAN_CALLBACK_SUBTYPE]);

127:   /* Record object removal from list of all objects */
128:   for (i=0; i<PetscObjectsMaxCounts; i++) {
129:     if (PetscObjects[i] == h) {
130:       PetscObjects[i] = 0;
131:       PetscObjectsCounts--;
132:       break;
133:     }
134:   }
135:   if (!PetscObjectsCounts) {
136:     PetscFree(PetscObjects);
137:     PetscObjectsMaxCounts = 0;
138:   }
139:   return(0);
140: }

144: /*@C
145:    PetscObjectCopyFortranFunctionPointers - Copy function pointers to another object

147:    Logically Collective on PetscObject

149:    Input Parameter:
150: +  src - source object
151: -  dest - destination object

153:    Level: developer

155:    Note:
156:    Both objects must have the same class.
157: @*/
158: PetscErrorCode PetscObjectCopyFortranFunctionPointers(PetscObject src,PetscObject dest)
159: {
161:   PetscInt       cbtype,numcb[PETSC_FORTRAN_CALLBACK_MAXTYPE];

166:   if (src->classid != dest->classid) SETERRQ(src->comm,PETSC_ERR_ARG_INCOMP,"Objects must be of the same class");

168:   PetscFree(dest->fortran_func_pointers);
169:   PetscMalloc(src->num_fortran_func_pointers*sizeof(void(*)(void)),&dest->fortran_func_pointers);
170:   PetscMemcpy(dest->fortran_func_pointers,src->fortran_func_pointers,src->num_fortran_func_pointers*sizeof(void(*)(void)));

172:   dest->num_fortran_func_pointers = src->num_fortran_func_pointers;

174:   PetscFortranCallbackGetSizes(src->classid,&numcb[PETSC_FORTRAN_CALLBACK_CLASS],&numcb[PETSC_FORTRAN_CALLBACK_SUBTYPE]);
175:   for (cbtype=PETSC_FORTRAN_CALLBACK_CLASS; cbtype<PETSC_FORTRAN_CALLBACK_MAXTYPE; cbtype++) {
176:     PetscFree(dest->fortrancallback[cbtype]);
177:     PetscMalloc(numcb[cbtype]*sizeof(PetscFortranCallback),&dest->fortrancallback[cbtype]);
178:     PetscMemzero(dest->fortrancallback[cbtype],numcb[cbtype]*sizeof(PetscFortranCallback));
179:     PetscMemcpy(dest->fortrancallback[cbtype],src->fortrancallback[cbtype],src->num_fortrancallback[cbtype]*sizeof(PetscFortranCallback));
180:   }
181:   return(0);
182: }

186: /*@C
187:    PetscObjectSetFortranCallback - set fortran callback function pointer and context

189:    Logically Collective

191:    Input Arguments:
192: +  obj - object on which to set callback
193: .  cbtype - callback type (class or subtype)
194: .  cid - address of callback Id, updated if not yet initialized (zero)
195: .  func - Fortran function
196: -  ctx - Fortran context

198:    Level: developer

200: .seealso: PetscObjectGetFortranCallback()
201: @*/
202: PetscErrorCode PetscObjectSetFortranCallback(PetscObject obj,PetscFortranCallbackType cbtype,PetscFortranCallbackId *cid,void (*func)(void),void *ctx)
203: {
205:   const char     *subtype = NULL;

209:   if (cbtype == PETSC_FORTRAN_CALLBACK_SUBTYPE) subtype = obj->type_name;
210:   if (!*cid) {PetscFortranCallbackRegister(obj->classid,subtype,cid);}
211:   if (*cid >= PETSC_SMALLEST_FORTRAN_CALLBACK+obj->num_fortrancallback[cbtype]) {
212:     PetscInt             oldnum = obj->num_fortrancallback[cbtype],newnum = PetscMax(1,2*oldnum);
213:     PetscFortranCallback *callback;
214:     PetscMalloc(newnum*sizeof(callback[0]),&callback);
215:     PetscMemcpy(callback,obj->fortrancallback[cbtype],oldnum*sizeof(*obj->fortrancallback[cbtype]));
216:     PetscFree(obj->fortrancallback[cbtype]);

218:     obj->fortrancallback[cbtype] = callback;
219:     obj->num_fortrancallback[cbtype] = newnum;
220:   }
221:   obj->fortrancallback[cbtype][*cid-PETSC_SMALLEST_FORTRAN_CALLBACK].func = func;
222:   obj->fortrancallback[cbtype][*cid-PETSC_SMALLEST_FORTRAN_CALLBACK].ctx = ctx;
223:   return(0);
224: }

228: /*@C
229:    PetscObjectGetFortranCallback - get fortran callback function pointer and context

231:    Logically Collective

233:    Input Arguments:
234: +  obj - object on which to get callback
235: .  cbtype - callback type
236: -  cid - address of callback Id

238:    Output Arguments:
239: +  func - Fortran function (or NULL if not needed)
240: -  ctx - Fortran context (or NULL if not needed)

242:    Level: developer

244: .seealso: PetscObjectSetFortranCallback()
245: @*/
246: PetscErrorCode PetscObjectGetFortranCallback(PetscObject obj,PetscFortranCallbackType cbtype,PetscFortranCallbackId cid,void (**func)(void),void **ctx)
247: {
248:   PetscFortranCallback *cb;

252:   if (PetscUnlikely(cid < PETSC_SMALLEST_FORTRAN_CALLBACK)) SETERRQ(obj->comm,PETSC_ERR_ARG_CORRUPT,"Fortran callback Id invalid");
253:   if (PetscUnlikely(cid >= PETSC_SMALLEST_FORTRAN_CALLBACK+obj->num_fortrancallback[cbtype])) SETERRQ(obj->comm,PETSC_ERR_ARG_CORRUPT,"Fortran callback not set on this object");
254:   cb = &obj->fortrancallback[cbtype][cid-PETSC_SMALLEST_FORTRAN_CALLBACK];
255:   if (func) *func = cb->func;
256:   if (ctx) *ctx = cb->ctx;
257:   return(0);
258: }

262: /*@C
263:    PetscObjectsDump - Prints the currently existing objects.

265:    Logically Collective on PetscViewer

267:    Input Parameter:
268: +  viewer - must be an PETSCVIEWERASCII viewer
269: -  all - by default only tries to display objects created explicitly by the user, if all is PETSC_TRUE then lists all outstanding objects

271:    Level: advanced

273:    Concepts: options database^printing

275: @*/
276: PetscErrorCode  PetscObjectsDump(FILE *fd,PetscBool all)
277: {
279:   PetscInt       i;
280: #if defined(PETSC_USE_DEBUG)
281:   PetscInt       j,k;
282: #endif
283:   PetscObject    h;

286:   if (PetscObjectsCounts) {
287:     PetscFPrintf(PETSC_COMM_WORLD,fd,"The following objects were never freed\n");
288:     PetscFPrintf(PETSC_COMM_WORLD,fd,"-----------------------------------------\n");
289:     for (i=0; i<PetscObjectsMaxCounts; i++) {
290:       if ((h = PetscObjects[i])) {
291:         PetscObjectName(h);
292:         {
293: #if defined(PETSC_USE_DEBUG)
294:         PetscStack *stack;
295:         char       *create,*rclass;

297:         /* if the PETSc function the user calls is not a create then this object was NOT directly created by them */
298:         PetscMallocGetStack(h,&stack);
299:         k    = stack->currentsize-2;
300:         if (!all) {
301:           k = 0;
302:           while (!stack->petscroutine[k]) k++;
303:           PetscStrstr(stack->function[k],"Create",&create);
304:           if (!create) {
305:             PetscStrstr(stack->function[k],"Get",&create);
306:           }
307:           PetscStrstr(stack->function[k],h->class_name,&rclass);

309:           if (!create) continue;
310:           if (!rclass) continue;
311:         }
312: #endif

314:         PetscFPrintf(PETSC_COMM_WORLD,fd,"[%d] %s %s %s\n",PetscGlobalRank,h->class_name,h->type_name,h->name);

316: #if defined(PETSC_USE_DEBUG)
317:         PetscMallocGetStack(h,&stack);
318:         for (j=k; j>=0; j--) {
319:           fprintf(fd,"      [%d]  %s() in %s%s\n",PetscGlobalRank,stack->function[j],stack->directory[j],stack->file[j]);
320:         }
321: #endif
322:         }
323:       }
324:     }
325:   }
326:   return(0);
327: }


332: /*@C
333:    PetscObjectsView - Prints the currently existing objects.

335:    Logically Collective on PetscViewer

337:    Input Parameter:
338: .  viewer - must be an PETSCVIEWERASCII viewer

340:    Level: advanced

342:    Concepts: options database^printing

344: @*/
345: PetscErrorCode  PetscObjectsView(PetscViewer viewer)
346: {
348:   PetscBool      isascii;
349:   FILE           *fd;

352:   if (!viewer) viewer = PETSC_VIEWER_STDOUT_WORLD;
353:   PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii);
354:   if (!isascii) SETERRQ(PetscObjectComm((PetscObject)viewer),PETSC_ERR_SUP,"Only supports ASCII viewer");
355:   PetscViewerASCIIGetPointer(viewer,&fd);
356:   PetscObjectsDump(fd,PETSC_TRUE);
357:   return(0);
358: }

362: /*@C
363:    PetscObjectsGetObject - Get a pointer to a named object

365:    Not collective

367:    Input Parameter:
368: .  name - the name of an object

370:    Output Parameter:
371: .   obj - the object or null if there is no object

373:    Level: advanced

375:    Concepts: options database^printing

377: @*/
378: PetscErrorCode  PetscObjectsGetObject(const char *name,PetscObject *obj,char **classname)
379: {
381:   PetscInt       i;
382:   PetscObject    h;
383:   PetscBool      flg;

386:   *obj = NULL;
387:   for (i=0; i<PetscObjectsMaxCounts; i++) {
388:     if ((h = PetscObjects[i])) {
389:       PetscObjectName(h);
390:       PetscStrcmp(h->name,name,&flg);
391:       if (flg) {
392:         *obj = h;
393:         if (classname) *classname = h->class_name;
394:         return(0);
395:       }
396:     }
397:   }
398:   return(0);
399: }

403: char *PetscObjectsGetObjectMatlab(const char* name,PetscObject *obj)
404: {
406:   PetscInt       i;
407:   PetscObject    h;
408:   PetscBool      flg;

411:   *obj = NULL;
412:   for (i=0; i<PetscObjectsMaxCounts; i++) {
413:     if ((h = PetscObjects[i])) {
414:       PetscObjectName(h);if (ierr) return(0);
415:       PetscStrcmp(h->name,name,&flg);if (ierr) return(0);
416:       if (flg) {
417:         *obj = h;
418:         PetscFunctionReturn(h->class_name);
419:       }
420:     }
421:   }
422:   return(0);
423: }

427: /*@C
428:     PetscObjectAddOptionsHandler - Adds an additional function to check for options when XXXSetFromOptions() is called.

430:     Not Collective

432:     Input Parameter:
433: +   obj - the PETSc object
434: .   handle - function that checks for options
435: .   destroy - function to destroy context if provided
436: -   ctx - optional context for check function

438:     Level: developer


441: .seealso: KSPSetFromOptions(), PCSetFromOptions(), SNESSetFromOptions(), PetscObjectProcessOptionsHandlers(), PetscObjectDestroyOptionsHandlers()

443: @*/
444: PetscErrorCode  PetscObjectAddOptionsHandler(PetscObject obj,PetscErrorCode (*handle)(PetscObject,void*),PetscErrorCode (*destroy)(PetscObject,void*),void *ctx)
445: {
448:   if (obj->noptionhandler >= PETSC_MAX_OPTIONS_HANDLER) SETERRQ(obj->comm,PETSC_ERR_ARG_OUTOFRANGE,"To many options handlers added");
449:   obj->optionhandler[obj->noptionhandler] = handle;
450:   obj->optiondestroy[obj->noptionhandler] = destroy;
451:   obj->optionctx[obj->noptionhandler++]   = ctx;
452:   return(0);
453: }

457: /*@C
458:     PetscObjectProcessOptionsHandlers - Calls all the options handlers attached to an object

460:     Not Collective

462:     Input Parameter:
463: .   obj - the PETSc object

465:     Level: developer


468: .seealso: KSPSetFromOptions(), PCSetFromOptions(), SNESSetFromOptions(), PetscObjectAddOptionsHandler(), PetscObjectDestroyOptionsHandlers()

470: @*/
471: PetscErrorCode  PetscObjectProcessOptionsHandlers(PetscObject obj)
472: {
473:   PetscInt       i;

478:   for (i=0; i<obj->noptionhandler; i++) {
479:     (*obj->optionhandler[i])(obj,obj->optionctx[i]);
480:   }
481:   return(0);
482: }

486: /*@C
487:     PetscObjectDestroyOptionsHandlers - Destroys all the option handlers attached to an object

489:     Not Collective

491:     Input Parameter:
492: .   obj - the PETSc object

494:     Level: developer


497: .seealso: KSPSetFromOptions(), PCSetFromOptions(), SNESSetFromOptions(), PetscObjectAddOptionsHandler(), PetscObjectProcessOptionsHandlers()

499: @*/
500: PetscErrorCode  PetscObjectDestroyOptionsHandlers(PetscObject obj)
501: {
502:   PetscInt       i;

507:   for (i=0; i<obj->noptionhandler; i++) {
508:     (*obj->optiondestroy[i])(obj,obj->optionctx[i]);
509:   }
510:   obj->noptionhandler = 0;
511:   return(0);
512: }


517: /*@
518:    PetscObjectReference - Indicates to any PetscObject that it is being
519:    referenced by another PetscObject. This increases the reference
520:    count for that object by one.

522:    Logically Collective on PetscObject

524:    Input Parameter:
525: .  obj - the PETSc object. This must be cast with (PetscObject), for example,
526:          PetscObjectReference((PetscObject)mat);

528:    Level: advanced

530: .seealso: PetscObjectCompose(), PetscObjectDereference()
531: @*/
532: PetscErrorCode  PetscObjectReference(PetscObject obj)
533: {
535:   if (!obj) return(0);
537:   obj->refct++;
538:   return(0);
539: }

543: /*@
544:    PetscObjectGetReference - Gets the current reference count for
545:    any PETSc object.

547:    Not Collective

549:    Input Parameter:
550: .  obj - the PETSc object; this must be cast with (PetscObject), for example,
551:          PetscObjectGetReference((PetscObject)mat,&cnt);

553:    Output Parameter:
554: .  cnt - the reference count

556:    Level: advanced

558: .seealso: PetscObjectCompose(), PetscObjectDereference(), PetscObjectReference()
559: @*/
560: PetscErrorCode  PetscObjectGetReference(PetscObject obj,PetscInt *cnt)
561: {
565:   *cnt = obj->refct;
566:   return(0);
567: }

571: /*@
572:    PetscObjectDereference - Indicates to any PetscObject that it is being
573:    referenced by one less PetscObject. This decreases the reference
574:    count for that object by one.

576:    Collective on PetscObject if reference reaches 0 otherwise Logically Collective

578:    Input Parameter:
579: .  obj - the PETSc object; this must be cast with (PetscObject), for example,
580:          PetscObjectDereference((PetscObject)mat);

582:    Notes: PetscObjectDestroy(PetscObject *obj)  sets the obj pointer to null after the call, this routine does not.

584:    Level: advanced

586: .seealso: PetscObjectCompose(), PetscObjectReference()
587: @*/
588: PetscErrorCode  PetscObjectDereference(PetscObject obj)
589: {

594:   if (obj->bops->destroy) {
595:     (*obj->bops->destroy)(&obj);
596:   } else if (!--obj->refct) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"This PETSc object does not have a generic destroy routine");
597:   return(0);
598: }

600: /* ----------------------------------------------------------------------- */
601: /*
602:      The following routines are the versions private to the PETSc object
603:      data structures.
604: */
607: PetscErrorCode PetscObjectGetComm_Petsc(PetscObject obj,MPI_Comm *comm)
608: {
611:   *comm = obj->comm;
612:   return(0);
613: }

617: PetscErrorCode PetscObjectRemoveReference(PetscObject obj,const char name[])
618: {

623:   PetscObjectListRemoveReference(&obj->olist,name);
624:   return(0);
625: }

629: PetscErrorCode PetscObjectCompose_Petsc(PetscObject obj,const char name[],PetscObject ptr)
630: {
632:   char           *tname;
633:   PetscBool      skipreference;

636:   if (ptr) {
637:     PetscObjectListReverseFind(ptr->olist,obj,&tname,&skipreference);
638:     if (tname && !skipreference) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_INCOMP,"An object cannot be composed with an object that was composed with it");
639:   }
640:   PetscObjectListAdd(&obj->olist,name,ptr);
641:   return(0);
642: }

646: PetscErrorCode PetscObjectQuery_Petsc(PetscObject obj,const char name[],PetscObject *ptr)
647: {

652:   PetscObjectListFind(obj->olist,name,ptr);
653:   return(0);
654: }

658: PetscErrorCode PetscObjectComposeFunction_Petsc(PetscObject obj,const char name[],void (*ptr)(void))
659: {

664:   PetscFunctionListAdd(&obj->qlist,name,ptr);
665:   return(0);
666: }

670: PetscErrorCode PetscObjectQueryFunction_Petsc(PetscObject obj,const char name[],void (**ptr)(void))
671: {

676:   PetscFunctionListFind(obj->qlist,name,ptr);
677:   return(0);
678: }

682: /*@C
683:    PetscObjectCompose - Associates another PETSc object with a given PETSc object.

685:    Not Collective

687:    Input Parameters:
688: +  obj - the PETSc object; this must be cast with (PetscObject), for example,
689:          PetscObjectCompose((PetscObject)mat,...);
690: .  name - name associated with the child object
691: -  ptr - the other PETSc object to associate with the PETSc object; this must also be
692:          cast with (PetscObject)

694:    Level: advanced

696:    Notes:
697:    The second objects reference count is automatically increased by one when it is
698:    composed.

700:    Replaces any previous object that had the same name.

702:    If ptr is null and name has previously been composed using an object, then that
703:    entry is removed from the obj.

705:    PetscObjectCompose() can be used with any PETSc object (such as
706:    Mat, Vec, KSP, SNES, etc.) or any user-provided object.  See
707:    PetscContainerCreate() for info on how to create an object from a
708:    user-provided pointer that may then be composed with PETSc objects.

710:    Concepts: objects^composing
711:    Concepts: composing objects

713: .seealso: PetscObjectQuery(), PetscContainerCreate()
714: @*/
715: PetscErrorCode  PetscObjectCompose(PetscObject obj,const char name[],PetscObject ptr)
716: {

723:   (*obj->bops->compose)(obj,name,ptr);
724:   return(0);
725: }

729: /*@C
730:    PetscObjectSetPrecision - sets the precision used within a given object.

732:    Collective on the PetscObject

734:    Input Parameters:
735: +  obj - the PETSc object; this must be cast with (PetscObject), for example,
736:          PetscObjectCompose((PetscObject)mat,...);
737: -  precision - the precision

739:    Level: advanced

741: .seealso: PetscObjectQuery(), PetscContainerCreate()
742: @*/
743: PetscErrorCode  PetscObjectSetPrecision(PetscObject obj,PetscPrecision precision)
744: {
747:   obj->precision = precision;
748:   return(0);
749: }

753: /*@C
754:    PetscObjectQuery  - Gets a PETSc object associated with a given object.

756:    Not Collective

758:    Input Parameters:
759: +  obj - the PETSc object
760:          Thus must be cast with a (PetscObject), for example,
761:          PetscObjectCompose((PetscObject)mat,...);
762: .  name - name associated with child object
763: -  ptr - the other PETSc object associated with the PETSc object, this must be
764:          cast with (PetscObject*)

766:    Level: advanced

768:    The reference count of neither object is increased in this call

770:    Concepts: objects^composing
771:    Concepts: composing objects
772:    Concepts: objects^querying
773:    Concepts: querying objects

775: .seealso: PetscObjectCompose()
776: @*/
777: PetscErrorCode  PetscObjectQuery(PetscObject obj,const char name[],PetscObject *ptr)
778: {

785:   (*obj->bops->query)(obj,name,ptr);
786:   return(0);
787: }

789: /*MC
790:    PetscObjectComposeFunction - Associates a function with a given PETSc object.

792:     Synopsis:
793:     #include "petscsys.h"
794:     PetscErrorCode PetscObjectComposeFunction(PetscObject obj,const char name[],void (*fptr)(void))

796:    Logically Collective on PetscObject

798:    Input Parameters:
799: +  obj - the PETSc object; this must be cast with a (PetscObject), for example,
800:          PetscObjectCompose((PetscObject)mat,...);
801: .  name - name associated with the child function
802: .  fname - name of the function
803: -  fptr - function pointer

805:    Level: advanced

807:    Notes:
808:    To remove a registered routine, pass in NULL for fptr().

810:    PetscObjectComposeFunction() can be used with any PETSc object (such as
811:    Mat, Vec, KSP, SNES, etc.) or any user-provided object.

813:    Concepts: objects^composing functions
814:    Concepts: composing functions
815:    Concepts: functions^querying
816:    Concepts: objects^querying
817:    Concepts: querying objects

819: .seealso: PetscObjectQueryFunction(), PetscContainerCreate()
820: M*/

824: PetscErrorCode  PetscObjectComposeFunction_Private(PetscObject obj,const char name[],void (*fptr)(void))
825: {

831:   (*obj->bops->composefunction)(obj,name,fptr);
832:   return(0);
833: }

835: /*MC
836:    PetscObjectQueryFunction - Gets a function associated with a given object.

838:     Synopsis:
839:     #include "petscsys.h"
840:     PetscErrorCode PetscObjectQueryFunction(PetscObject obj,const char name[],void (**fptr)(void))

842:    Logically Collective on PetscObject

844:    Input Parameters:
845: +  obj - the PETSc object; this must be cast with (PetscObject), for example,
846:          PetscObjectQueryFunction((PetscObject)ksp,...);
847: -  name - name associated with the child function

849:    Output Parameter:
850: .  fptr - function pointer

852:    Level: advanced

854:    Concepts: objects^composing functions
855:    Concepts: composing functions
856:    Concepts: functions^querying
857:    Concepts: objects^querying
858:    Concepts: querying objects

860: .seealso: PetscObjectComposeFunction(), PetscFunctionListFind()
861: M*/
864: PETSC_EXTERN PetscErrorCode PetscObjectQueryFunction_Private(PetscObject obj,const char name[],void (**ptr)(void))
865: {

871:   (*obj->bops->queryfunction)(obj,name,ptr);
872:   return(0);
873: }

875: struct _p_PetscContainer {
876:   PETSCHEADER(int);
877:   void           *ptr;
878:   PetscErrorCode (*userdestroy)(void*);
879: };

883: /*@C
884:    PetscContainerGetPointer - Gets the pointer value contained in the container.

886:    Not Collective

888:    Input Parameter:
889: .  obj - the object created with PetscContainerCreate()

891:    Output Parameter:
892: .  ptr - the pointer value

894:    Level: advanced

896: .seealso: PetscContainerCreate(), PetscContainerDestroy(),
897:           PetscContainerSetPointer()
898: @*/
899: PetscErrorCode  PetscContainerGetPointer(PetscContainer obj,void **ptr)
900: {
904:   *ptr = obj->ptr;
905:   return(0);
906: }


911: /*@C
912:    PetscContainerSetPointer - Sets the pointer value contained in the container.

914:    Logically Collective on PetscContainer

916:    Input Parameters:
917: +  obj - the object created with PetscContainerCreate()
918: -  ptr - the pointer value

920:    Level: advanced

922: .seealso: PetscContainerCreate(), PetscContainerDestroy(),
923:           PetscContainerGetPointer()
924: @*/
925: PetscErrorCode  PetscContainerSetPointer(PetscContainer obj,void *ptr)
926: {
930:   obj->ptr = ptr;
931:   return(0);
932: }

936: /*@C
937:    PetscContainerDestroy - Destroys a PETSc container object.

939:    Collective on PetscContainer

941:    Input Parameter:
942: .  obj - an object that was created with PetscContainerCreate()

944:    Level: advanced

946: .seealso: PetscContainerCreate(), PetscContainerSetUserDestroy()
947: @*/
948: PetscErrorCode  PetscContainerDestroy(PetscContainer *obj)
949: {

953:   if (!*obj) return(0);
955:   if (--((PetscObject)(*obj))->refct > 0) {*obj = 0; return(0);}
956:   if ((*obj)->userdestroy) (*(*obj)->userdestroy)((*obj)->ptr);
957:   PetscHeaderDestroy(obj);
958:   return(0);
959: }

963: /*@C
964:    PetscContainerSetUserDestroy - Sets name of the user destroy function.

966:    Logically Collective on PetscContainer

968:    Input Parameter:
969: +  obj - an object that was created with PetscContainerCreate()
970: -  des - name of the user destroy function

972:    Level: advanced

974: .seealso: PetscContainerDestroy()
975: @*/
976: PetscErrorCode  PetscContainerSetUserDestroy(PetscContainer obj, PetscErrorCode (*des)(void*))
977: {
980:   obj->userdestroy = des;
981:   return(0);
982: }

984: PetscClassId PETSC_CONTAINER_CLASSID;

988: /*@C
989:    PetscContainerCreate - Creates a PETSc object that has room to hold
990:    a single pointer. This allows one to attach any type of data (accessible
991:    through a pointer) with the PetscObjectCompose() function to a PetscObject.
992:    The data item itself is attached by a call to PetscContainerSetPointer().

994:    Collective on MPI_Comm

996:    Input Parameters:
997: .  comm - MPI communicator that shares the object

999:    Output Parameters:
1000: .  container - the container created

1002:    Level: advanced

1004: .seealso: PetscContainerDestroy(), PetscContainerSetPointer(), PetscContainerGetPointer()
1005: @*/
1006: PetscErrorCode  PetscContainerCreate(MPI_Comm comm,PetscContainer *container)
1007: {
1009:   PetscContainer contain;

1013:   PetscHeaderCreate(contain,_p_PetscContainer,PetscInt,PETSC_CONTAINER_CLASSID,"PetscContainer","Container","Sys",comm,PetscContainerDestroy,0);
1014:   *container = contain;
1015:   return(0);
1016: }

1020: /*@
1021:    PetscObjectSetFromOptions - Sets generic parameters from user options.

1023:    Collective on obj

1025:    Input Parameter:
1026: .  obj - the PetscObjcet

1028:    Options Database Keys:

1030:    Notes:
1031:    We have no generic options at present, so this does nothing

1033:    Level: beginner

1035: .keywords: set, options, database
1036: .seealso: PetscObjectSetOptionsPrefix(), PetscObjectGetOptionsPrefix()
1037: @*/
1038: PetscErrorCode  PetscObjectSetFromOptions(PetscObject obj)
1039: {
1042:   return(0);
1043: }

1047: /*@
1048:    PetscObjectSetUp - Sets up the internal data structures for the later use.

1050:    Collective on PetscObject

1052:    Input Parameters:
1053: .  obj - the PetscObject

1055:    Notes:
1056:    This does nothing at present.

1058:    Level: advanced

1060: .keywords: setup
1061: .seealso: PetscObjectDestroy()
1062: @*/
1063: PetscErrorCode  PetscObjectSetUp(PetscObject obj)
1064: {
1067:   return(0);
1068: }