About user defined PC

jiaxun hou jiaxun_hou at yahoo.com.cn
Wed Aug 9 05:42:35 CDT 2006 

Barry,
Thank you very much. Your codes are very useful !

Regards,
Jiaxun

Barry Smith <bsmith at mcs.anl.gov> 写道： 
   Jiaxun,

     I am assuming you are using the PCSHELL? I have added support for this for 
you;

* if you are using petsc-dev
    (http://www-unix.mcs.anl.gov/petsc/petsc-as/developers/index.html) you need
    only do an hg pull to get my additions then run "make" in
    src/ksp/pc/impls/shell.

* if you are not using petsc-dev (or use the nightly tar ball) then I attach the
    three files that were
    changed. include/private/pcimpl.h, include/petscpc.h and
    src/ksp/pc/impls/shell/shell.c (again run make in src/ksp/pc/impls/shell)

    If you are actually writing a complete PC and not using PCSHELL
http://www-unix.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/src/ksp/pc/impls/jacobi/jacobi.c.html
then you just need to provide a routine PCApplyBA_XXXX() with calling sequence:
PC,PCSide,Vec b,Vec x,Vec work

   Good luck,

     Barry



On Tue, 8 Aug 2006, jiaxun hou wrote:

> Hi,
>
>  I met a problem ,when I constructed a user-defined PC. That is I need to defind the process of  P^(-1)Mx in each iteration of GMRES by myself for efficient reason, not only define P^(-1)x . But the Petsc seems to  separate  this process into two parts: the first is y=Mx which is defined in Petsc framework, and the second is P^(-1)y which is defined  by the user. So, is there any way to do it without change the code of Petsc framework?
>
>  Regards,
>  Jiaxun
>
>
> ---------------------------------
> 抢注雅虎免费邮箱-3.5G容量，20M附件！/*
      Preconditioner module. 
*/
#if !defined(__PETSCPC_H)
#define __PETSCPC_H
#include "petscmat.h"
PETSC_EXTERN_CXX_BEGIN

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT  PCInitializePackage(const char[]);

/*
    PCList contains the list of preconditioners currently registered
   These are added with the PCRegisterDynamic() macro
*/
extern PetscFList PCList;
#define PCType const char*

/*S
     PC - Abstract PETSc object that manages all preconditioners

   Level: beginner

  Concepts: preconditioners

.seealso:  PCCreate(), PCSetType(), PCType (for list of available types)
S*/
typedef struct _p_PC* PC;

/*E
    PCType - String with the name of a PETSc preconditioner method or the creation function
       with an optional dynamic library name, for example
       http://www.mcs.anl.gov/petsc/lib.a:mypccreate()

   Level: beginner

   Notes: Click on the links below to see details on a particular solver

.seealso: PCSetType(), PC, PCCreate()
E*/
#define PCNONE            "none"
#define PCJACOBI          "jacobi"
#define PCSOR             "sor"
#define PCLU              "lu"
#define PCSHELL           "shell"
#define PCBJACOBI         "bjacobi"
#define PCMG              "mg"
#define PCEISENSTAT       "eisenstat"
#define PCILU             "ilu"
#define PCICC             "icc"
#define PCASM             "asm"
#define PCKSP             "ksp"
#define PCCOMPOSITE       "composite"
#define PCREDUNDANT       "redundant"
#define PCSPAI            "spai"
#define PCNN              "nn"
#define PCCHOLESKY        "cholesky"
#define PCSAMG            "samg"
#define PCPBJACOBI        "pbjacobi"
#define PCMAT             "mat"
#define PCHYPRE           "hypre"
#define PCFIELDSPLIT      "fieldsplit"
#define PCTFS             "tfs"
#define PCML              "ml"
#define PCPROMETHEUS      "prometheus"
#define PCGALERKIN        "galerkin"

/* Logging support */
extern PetscCookie PETSCKSP_DLLEXPORT PC_COOKIE;

/*E
    PCSide - If the preconditioner is to be applied to the left, right
     or symmetrically around the operator.

   Level: beginner

.seealso: 
E*/
typedef enum { PC_LEFT,PC_RIGHT,PC_SYMMETRIC } PCSide;
extern const char *PCSides[];

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCreate(MPI_Comm,PC*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetType(PC,PCType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetUp(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetUpOnBlocks(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApply(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplySymmetricLeft(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplySymmetricRight(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplyBAorAB(PC,PCSide,Vec,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplyTranspose(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCHasApplyTranspose(PC,PetscTruth*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplyBAorABTranspose(PC,PCSide,Vec,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplyRichardson(PC,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCApplyRichardsonExists(PC,PetscTruth*);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRegisterDestroy(void);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRegisterAll(const char[]);
extern PetscTruth PCRegisterAllCalled;

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRegister(const char[],const char[],const char[],PetscErrorCode(*)(PC));

/*MC
   PCRegisterDynamic - Adds a method to the preconditioner package.

   Synopsis:
   PetscErrorCode PCRegisterDynamic(char *name_solver,char *path,char *name_create,PetscErrorCode (*routine_create)(PC))

   Not collective

   Input Parameters:
+  name_solver - name of a new user-defined solver
.  path - path (either absolute or relative) the library containing this solver
.  name_create - name of routine to create method context
-  routine_create - routine to create method context

   Notes:
   PCRegisterDynamic() may be called multiple times to add several user-defined preconditioners.

   If dynamic libraries are used, then the fourth input argument (routine_create)
   is ignored.

   Sample usage:
.vb
   PCRegisterDynamic("my_solver","/home/username/my_lib/lib/libO/solaris/mylib",
              "MySolverCreate",MySolverCreate);
.ve

   Then, your solver can be chosen with the procedural interface via
$     PCSetType(pc,"my_solver")
   or at runtime via the option
$     -pc_type my_solver

   Level: advanced

   Notes: ${PETSC_ARCH}, ${PETSC_DIR}, ${PETSC_LIB_DIR},  or ${any environmental variable}
           occuring in pathname will be replaced with appropriate values.
         If your function is not being put into a shared library then use PCRegister() instead

.keywords: PC, register

.seealso: PCRegisterAll(), PCRegisterDestroy()
M*/
#if defined(PETSC_USE_DYNAMIC_LIBRARIES)
#define PCRegisterDynamic(a,b,c,d) PCRegister(a,b,c,0)
#else
#define PCRegisterDynamic(a,b,c,d) PCRegister(a,b,c,d)
#endif

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCDestroy(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetFromOptions(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGetType(PC,PCType*);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGetFactoredMatrix(PC,Mat*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetModifySubMatrices(PC,PetscErrorCode(*)(PC,PetscInt,const IS[],const IS[],Mat[],void*),void*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCModifySubMatrices(PC,PetscInt,const IS[],const IS[],Mat[],void*);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetOperators(PC,Mat,Mat,MatStructure);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGetOperators(PC,Mat*,Mat*,MatStructure*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGetOperatorsSet(PC,PetscTruth*,PetscTruth*);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCView(PC,PetscViewer);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetOptionsPrefix(PC,const char[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCAppendOptionsPrefix(PC,const char[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGetOptionsPrefix(PC,const char*[]);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCComputeExplicitOperator(PC,Mat*);

/*
      These are used to provide extra scaling of preconditioned 
   operator for time-stepping schemes like in SUNDIALS 
*/
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCDiagonalScale(PC,PetscTruth*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCDiagonalScaleLeft(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCDiagonalScaleRight(PC,Vec,Vec);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCDiagonalScaleSet(PC,Vec);

/* ------------- options specific to particular preconditioners --------- */

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCJacobiSetUseRowMax(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCJacobiSetUseAbs(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSORSetSymmetric(PC,MatSORType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSORSetOmega(PC,PetscReal);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSORSetIterations(PC,PetscInt,PetscInt);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCEisenstatSetOmega(PC,PetscReal);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCEisenstatNoDiagonalScaling(PC);

#define USE_PRECONDITIONER_MATRIX 0
#define USE_TRUE_MATRIX           1
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCBJacobiSetUseTrueLocal(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCBJacobiSetTotalBlocks(PC,PetscInt,const PetscInt[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCBJacobiSetLocalBlocks(PC,PetscInt,const PetscInt[]);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCKSPSetUseTrue(PC);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApply(PC,PetscErrorCode (*)(void*,Vec,Vec)); 
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyBA(PC,PetscErrorCode (*)(void*,PCSide,Vec,Vec,Vec)); 
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyTranspose(PC,PetscErrorCode (*)(void*,Vec,Vec));
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetSetUp(PC,PetscErrorCode (*)(void*));
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyRichardson(PC,PetscErrorCode (*)(void*,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal,PetscInt));
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetView(PC,PetscErrorCode (*)(void*,PetscViewer));
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetDestroy(PC,PetscErrorCode (*)(void*));
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellGetContext(PC,void**);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetContext(PC,void*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetName(PC,const char[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCShellGetName(PC,char*[]);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetZeroPivot(PC,PetscReal);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetShiftNonzero(PC,PetscReal); 
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetShiftPd(PC,PetscTruth); 


EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetFill(PC,PetscReal);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetPivoting(PC,PetscReal);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorReorderForNonzeroDiagonal(PC,PetscReal);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetMatOrdering(PC,MatOrderingType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetReuseOrdering(PC,PetscTruth);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetReuseFill(PC,PetscTruth);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetUseInPlace(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetAllowDiagonalFill(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetPivotInBlocks(PC,PetscTruth);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetLevels(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetUseDropTolerance(PC,PetscReal,PetscReal,PetscInt);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMSetLocalSubdomains(PC,PetscInt,IS[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMSetTotalSubdomains(PC,PetscInt,IS[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMSetOverlap(PC,PetscInt);
/*E
    PCASMType - Type of additive Schwarz method to use

$  PC_ASM_BASIC - symmetric version where residuals from the ghost points are used
$                 and computed values in ghost regions are added together. Classical
$                 standard additive Schwarz
$  PC_ASM_RESTRICT - residuals from ghost points are used but computed values in ghost
$                    region are discarded. Default
$  PC_ASM_INTERPOLATE - residuals from ghost points are not used, computed values in ghost
$                       region are added back in
$  PC_ASM_NONE - ghost point residuals are not used, computed ghost values are discarded
$                not very good.                

   Level: beginner

.seealso: PCASMSetType()
E*/
typedef enum {PC_ASM_BASIC = 3,PC_ASM_RESTRICT = 1,PC_ASM_INTERPOLATE = 2,PC_ASM_NONE = 0} PCASMType;
extern const char *PCASMTypes[];

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMSetType(PC,PCASMType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMCreateSubdomains2D(PetscInt,PetscInt,PetscInt,PetscInt,PetscInt,PetscInt,PetscInt *,IS **);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMSetUseInPlace(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMGetLocalSubdomains(PC,PetscInt*,IS*[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCASMGetLocalSubmatrices(PC,PetscInt*,Mat*[]);

/*E
    PCCompositeType - Determines how two or more preconditioner are composed

$  PC_COMPOSITE_ADDITIVE - results from application of all preconditioners are added together
$  PC_COMPOSITE_MULTIPLICATIVE - preconditioners are applied sequentially to the residual freshly
$                                computed after the previous preconditioner application
$  PC_COMPOSITE_SPECIAL - This is very special for a matrix of the form alpha I + R + S
$                         where first preconditioner is built from alpha I + S and second from
$                         alpha I + R

   Level: beginner

.seealso: PCCompositeSetType()
E*/
typedef enum {PC_COMPOSITE_ADDITIVE,PC_COMPOSITE_MULTIPLICATIVE,PC_COMPOSITE_SPECIAL} PCCompositeType;
extern const char *PCCompositeTypes[];

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCompositeSetUseTrue(PC);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCompositeSetType(PC,PCCompositeType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCompositeAddPC(PC,PCType);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCompositeGetPC(PC pc,PetscInt n,PC *);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCCompositeSpecialSetAlpha(PC,PetscScalar);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRedundantSetScatter(PC,VecScatter,VecScatter);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRedundantGetOperators(PC,Mat*,Mat*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCRedundantGetPC(PC,PC*);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetEpsilon(PC,double);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetNBSteps(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetMax(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetMaxNew(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetBlockSize(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetCacheSize(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetVerbose(PC,PetscInt);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSPAISetSp(PC,PetscInt);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCHYPRESetType(PC,const char[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCBJacobiGetLocalBlocks(PC,PetscInt*,const PetscInt*[]);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCBJacobiGetTotalBlocks(PC,PetscInt*,const PetscInt*[]);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFieldSplitSetFields(PC,PetscInt,PetscInt*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCFieldSplitSetType(PC,PCCompositeType);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGalerkinSetRestriction(PC,Mat);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCGalerkinSetInterpolation(PC,Mat);

EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSetCoordinates(PC,PetscInt,PetscReal*);
EXTERN PetscErrorCode PETSCKSP_DLLEXPORT PCSASetVectors(PC,PetscInt,PetscReal *);


PETSC_EXTERN_CXX_END
#endif /* __PETSCPC_H */

#ifndef _PCIMPL
#define _PCIMPL

#include "petscksp.h"
#include "petscpc.h"

typedef struct _PCOps *PCOps;
struct _PCOps {
  PetscErrorCode (*setup)(PC);
  PetscErrorCode (*apply)(PC,Vec,Vec);
  PetscErrorCode (*applyrichardson)(PC,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal,PetscInt);
  PetscErrorCode (*applyBA)(PC,PCSide,Vec,Vec,Vec);
  PetscErrorCode (*applytranspose)(PC,Vec,Vec);
  PetscErrorCode (*applyBAtranspose)(PC,PetscInt,Vec,Vec,Vec);
  PetscErrorCode (*setfromoptions)(PC);
  PetscErrorCode (*presolve)(PC,KSP,Vec,Vec);
  PetscErrorCode (*postsolve)(PC,KSP,Vec,Vec);  
  PetscErrorCode (*getfactoredmatrix)(PC,Mat*);
  PetscErrorCode (*applysymmetricleft)(PC,Vec,Vec);
  PetscErrorCode (*applysymmetricright)(PC,Vec,Vec);
  PetscErrorCode (*setuponblocks)(PC);
  PetscErrorCode (*destroy)(PC);
  PetscErrorCode (*view)(PC,PetscViewer);
};

/*
   Preconditioner context
*/
struct _p_PC {
  PETSCHEADER(struct _PCOps);
  PetscInt       setupcalled;
  MatStructure   flag;
  Mat            mat,pmat;
  Vec            diagonalscaleright,diagonalscaleleft; /* used for time integration scaling */
  PetscTruth     diagonalscale;
  PetscErrorCode (*modifysubmatrices)(PC,PetscInt,const IS[],const IS[],Mat[],void*); /* user provided routine */
  void           *modifysubmatricesP; /* context for user routine */
  void           *data;
};

extern PetscEvent  PC_SetUp, PC_SetUpOnBlocks, PC_Apply, PC_ApplyCoarse, PC_ApplyMultiple, PC_ApplySymmetricLeft;
extern PetscEvent  PC_ApplySymmetricRight, PC_ModifySubMatrices;

#endif
#define PETSCKSP_DLL

/*
   This provides a simple shell for Fortran (and C programmers) to 
  create their own preconditioner without writing much interface code.
*/

#include "private/pcimpl.h"        /*I "petscpc.h" I*/
#include "private/vecimpl.h"  

EXTERN_C_BEGIN 
typedef struct {
  void           *ctx;                     /* user provided contexts for preconditioner */
  PetscErrorCode (*destroy)(void*);
  PetscErrorCode (*setup)(void*);
  PetscErrorCode (*apply)(void*,Vec,Vec);
  PetscErrorCode (*applyBA)(void*,PCSide,Vec,Vec,Vec);
  PetscErrorCode (*presolve)(void*,KSP,Vec,Vec);
  PetscErrorCode (*postsolve)(void*,KSP,Vec,Vec);
  PetscErrorCode (*view)(void*,PetscViewer);
  PetscErrorCode (*applytranspose)(void*,Vec,Vec);
  PetscErrorCode (*applyrich)(void*,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal,PetscInt);
  char           *name;
} PC_Shell;
EXTERN_C_END

#undef __FUNCT__  
#define __FUNCT__ "PCShellGetContext"
/*@
    PCShellGetContext - Returns the user-provided context associated with a shell PC

    Not Collective

    Input Parameter:
.   pc - should have been created with PCCreateShell()

    Output Parameter:
.   ctx - the user provided context

    Level: advanced

    Notes:
    This routine is intended for use within various shell routines
    
.keywords: PC, shell, get, context

.seealso: PCCreateShell(), PCShellSetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellGetContext(PC pc,void **ctx)
{
  PetscErrorCode ierr;
  PetscTruth     flg;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  PetscValidPointer(ctx,2); 
  ierr = PetscTypeCompare((PetscObject)pc,PCSHELL,&flg);CHKERRQ(ierr);
  if (!flg) *ctx = 0; 
  else      *ctx = ((PC_Shell*)(pc->data))->ctx; 
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetContext"
/*@C
    PCShellSetContext - sets the context for a shell PC

   Collective on PC

    Input Parameters:
+   pc - the shell PC
-   ctx - the context

   Level: advanced

   Fortran Notes: The context can only be an integer or a PetscObject
      unfortunately it cannot be a Fortran array or derived type.

.seealso: PCCreateShell(), PCShellGetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetContext(PC pc,void *ctx)
{
  PC_Shell      *shell = (PC_Shell*)pc->data;
  PetscErrorCode ierr;
  PetscTruth     flg;

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscTypeCompare((PetscObject)pc,PCSHELL,&flg);CHKERRQ(ierr);
  if (flg) {
    shell->ctx = ctx;
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCSetUp_Shell"
static PetscErrorCode PCSetUp_Shell(PC pc)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (shell->setup) {
    CHKMEMQ;
    ierr  = (*shell->setup)(shell->ctx);CHKERRQ(ierr);
    CHKMEMQ;
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCApply_Shell"
static PetscErrorCode PCApply_Shell(PC pc,Vec x,Vec y)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (!shell->apply) SETERRQ(PETSC_ERR_USER,"No apply() routine provided to Shell PC");
  PetscStackPush("PCSHELL user function");
  CHKMEMQ;
  ierr  = (*shell->apply)(shell->ctx,x,y);CHKERRQ(ierr);
  CHKMEMQ;
  PetscStackPop;
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCApplyBA_Shell"
static PetscErrorCode PCApplyBA_Shell(PC pc,PCSide side,Vec x,Vec y,Vec w)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (!shell->applyBA) SETERRQ(PETSC_ERR_USER,"No applyBA() routine provided to Shell PC");
  PetscStackPush("PCSHELL user function BA");
  CHKMEMQ;
  ierr  = (*shell->applyBA)(shell->ctx,side,x,y,w);CHKERRQ(ierr);
  CHKMEMQ;
  PetscStackPop;
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCPreSolve_Shell"
static PetscErrorCode PCPreSolve_Shell(PC pc,KSP ksp,Vec b,Vec x)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (!shell->presolve) SETERRQ(PETSC_ERR_USER,"No presolve() routine provided to Shell PC");
  ierr  = (*shell->presolve)(shell->ctx,ksp,b,x);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCPostSolve_Shell"
static PetscErrorCode PCPostSolve_Shell(PC pc,KSP ksp,Vec b,Vec x)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (!shell->postsolve) SETERRQ(PETSC_ERR_USER,"No postsolve() routine provided to Shell PC");
  ierr  = (*shell->postsolve)(shell->ctx,ksp,b,x);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCApplyTranspose_Shell"
static PetscErrorCode PCApplyTranspose_Shell(PC pc,Vec x,Vec y)
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  if (!shell->applytranspose) SETERRQ(PETSC_ERR_USER,"No applytranspose() routine provided to Shell PC");
  ierr  = (*shell->applytranspose)(shell->ctx,x,y);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCApplyRichardson_Shell"
static PetscErrorCode PCApplyRichardson_Shell(PC pc,Vec x,Vec y,Vec w,PetscReal rtol,PetscReal abstol, PetscReal dtol,PetscInt it)
{
  PetscErrorCode ierr;
  PC_Shell       *shell;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  ierr  = (*shell->applyrich)(shell->ctx,x,y,w,rtol,abstol,dtol,it);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCDestroy_Shell"
static PetscErrorCode PCDestroy_Shell(PC pc)
{
  PC_Shell       *shell = (PC_Shell*)pc->data;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  ierr = PetscStrfree(shell->name);CHKERRQ(ierr);
  if (shell->destroy) {
    ierr  = (*shell->destroy)(shell->ctx);CHKERRQ(ierr);
  }
  ierr = PetscFree(shell);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCView_Shell"
static PetscErrorCode PCView_Shell(PC pc,PetscViewer viewer)
{
  PC_Shell       *shell = (PC_Shell*)pc->data;
  PetscErrorCode ierr;
  PetscTruth     iascii;

  PetscFunctionBegin;
  ierr = PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_ASCII,&iascii);CHKERRQ(ierr);
  if (iascii) {
    if (shell->name) {ierr = PetscViewerASCIIPrintf(viewer,"  Shell: %s\n",shell->name);CHKERRQ(ierr);}
    else             {ierr = PetscViewerASCIIPrintf(viewer,"  Shell: no name\n");CHKERRQ(ierr);}
  }
  if (shell->view) {
    ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr);
    ierr  = (*shell->view)(shell->ctx,viewer);CHKERRQ(ierr);
    ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

/* ------------------------------------------------------------------------------*/
EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetDestroy_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetDestroy_Shell(PC pc, PetscErrorCode (*destroy)(void*))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell          = (PC_Shell*)pc->data;
  shell->destroy = destroy;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetSetUp_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetSetUp_Shell(PC pc, PetscErrorCode (*setup)(void*))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell        = (PC_Shell*)pc->data;
  shell->setup = setup;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApply_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApply_Shell(PC pc,PetscErrorCode (*apply)(void*,Vec,Vec))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell        = (PC_Shell*)pc->data;
  shell->apply = apply;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApplyBA_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyBA_Shell(PC pc,PetscErrorCode (*apply)(void*,PCSide,Vec,Vec,Vec))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell          = (PC_Shell*)pc->data;
  shell->applyBA = apply;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetPreSolve_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetPreSolve_Shell(PC pc,PetscErrorCode (*presolve)(void*,KSP,Vec,Vec))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell             = (PC_Shell*)pc->data;
  shell->presolve   = presolve;
  if (presolve) {
    pc->ops->presolve = PCPreSolve_Shell;
  } else {
    pc->ops->presolve = 0;
  }
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetPostSolve_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetPostSolve_Shell(PC pc,PetscErrorCode (*postsolve)(void*,KSP,Vec,Vec))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell           = (PC_Shell*)pc->data;
  shell->postsolve = postsolve;
  if (postsolve) {
    pc->ops->postsolve = PCPostSolve_Shell;
  } else {
    pc->ops->postsolve = 0;
  }
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetView_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetView_Shell(PC pc,PetscErrorCode (*view)(void*,PetscViewer))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell        = (PC_Shell*)pc->data;
  shell->view = view;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApplyTranspose_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyTranspose_Shell(PC pc,PetscErrorCode (*applytranspose)(void*,Vec,Vec))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell                 = (PC_Shell*)pc->data;
  shell->applytranspose = applytranspose;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetName_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetName_Shell(PC pc,const char name[])
{
  PC_Shell       *shell;
  PetscErrorCode ierr;

  PetscFunctionBegin;
  shell = (PC_Shell*)pc->data;
  ierr = PetscStrfree(shell->name);CHKERRQ(ierr);    
  ierr = PetscStrallocpy(name,&shell->name);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellGetName_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellGetName_Shell(PC pc,char *name[])
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell  = (PC_Shell*)pc->data;
  *name  = shell->name;
  PetscFunctionReturn(0);
}
EXTERN_C_END

EXTERN_C_BEGIN
#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApplyRichardson_Shell"
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyRichardson_Shell(PC pc,PetscErrorCode (*apply)(void*,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal,PetscInt))
{
  PC_Shell *shell;

  PetscFunctionBegin;
  shell                     = (PC_Shell*)pc->data;
  pc->ops->applyrichardson  = PCApplyRichardson_Shell;
  shell->applyrich          = apply;
  PetscFunctionReturn(0);
}
EXTERN_C_END

/* -------------------------------------------------------------------------------*/

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetDestroy"
/*@C
   PCShellSetDestroy - Sets routine to use to destroy the user-provided 
   application context.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
.  destroy - the application-provided destroy routine

   Calling sequence of destroy:
.vb
   PetscErrorCode destroy (void *ptr)
.ve

.  ptr - the application context

   Level: developer

.keywords: PC, shell, set, destroy, user-provided

.seealso: PCShellSetApply(), PCShellSetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetDestroy(PC pc,PetscErrorCode (*destroy)(void*))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetDestroy_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,destroy);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}


#undef __FUNCT__  
#define __FUNCT__ "PCShellSetSetUp"
/*@C
   PCShellSetSetUp - Sets routine to use to "setup" the preconditioner whenever the 
   matrix operator is changed.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
.  setup - the application-provided setup routine

   Calling sequence of setup:
.vb
   PetscErrorCode setup (void *ptr)
.ve

.  ptr - the application context

   Level: developer

.keywords: PC, shell, set, setup, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetApply(), PCShellSetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetSetUp(PC pc,PetscErrorCode (*setup)(void*))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetSetUp_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,setup);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}


#undef __FUNCT__  
#define __FUNCT__ "PCShellSetView"
/*@C
   PCShellSetView - Sets routine to use as viewer of shell preconditioner

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  view - the application-provided view routine

   Calling sequence of apply:
.vb
   PetscErrorCode view(void *ptr,PetscViewer v)
.ve

+  ptr - the application context
-  v   - viewer

   Level: developer

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetView(PC pc,PetscErrorCode (*view)(void*,PetscViewer))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,PetscViewer));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetView_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,view);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApply"
/*@C
   PCShellSetApply - Sets routine to use as preconditioner.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  apply - the application-provided preconditioning routine

   Calling sequence of apply:
.vb
   PetscErrorCode apply (void *ptr,Vec xin,Vec xout)
.ve

+  ptr - the application context
.  xin - input vector
-  xout - output vector

   Level: developer

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetContext(), PCShellSetApplyBA()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApply(PC pc,PetscErrorCode (*apply)(void*,Vec,Vec))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,Vec,Vec));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetApply_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,apply);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApplyBA"
/*@C
   PCShellSetApplyBA - Sets routine to use as preconditioner times operator.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  applyBA - the application-provided BA routine

   Calling sequence of apply:
.vb
   PetscErrorCode applyBA (void *ptr,Vec xin,Vec xout)
.ve

+  ptr - the application context
.  xin - input vector
-  xout - output vector

   Level: developer

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetContext(), PCShellSetApply()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyBA(PC pc,PetscErrorCode (*applyBA)(void*,PCSide,Vec,Vec,Vec))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,PCSide,Vec,Vec,Vec));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetApplyBA_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,applyBA);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetApplyTranspose"
/*@C
   PCShellSetApplyTranspose - Sets routine to use as preconditioner transpose.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  apply - the application-provided preconditioning transpose routine

   Calling sequence of apply:
.vb
   PetscErrorCode applytranspose (void *ptr,Vec xin,Vec xout)
.ve

+  ptr - the application context
.  xin - input vector
-  xout - output vector

   Level: developer

   Notes: 
   Uses the same context variable as PCShellSetApply().

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApply(), PCSetContext(), PCShellSetApplyBA()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetApplyTranspose(PC pc,PetscErrorCode (*applytranspose)(void*,Vec,Vec))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,Vec,Vec));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetApplyTranspose_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,applytranspose);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetPreSolve"
/*@C
   PCShellSetPreSolve - Sets routine to apply to the operators/vectors before a KSPSolve() is
      applied. This usually does something like scale the linear system in some application 
      specific way.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  presolve - the application-provided presolve routine

   Calling sequence of presolve:
.vb
   PetscErrorCode presolve (void *ptr,KSP ksp,Vec b,Vec x)
.ve

+  ptr - the application context
.  xin - input vector
-  xout - output vector

   Level: developer

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetPostSolve(), PCShellSetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetPreSolve(PC pc,PetscErrorCode (*presolve)(void*,KSP,Vec,Vec))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,KSP,Vec,Vec));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetPreSolve_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,presolve);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetPostSolve"
/*@C
   PCShellSetPostSolve - Sets routine to apply to the operators/vectors before a KSPSolve() is
      applied. This usually does something like scale the linear system in some application 
      specific way.

   Collective on PC

   Input Parameters:
+  pc - the preconditioner context
-  postsolve - the application-provided presolve routine

   Calling sequence of postsolve:
.vb
   PetscErrorCode postsolve(void *ptr,KSP ksp,Vec b,Vec x)
.ve

+  ptr - the application context
.  xin - input vector
-  xout - output vector

   Level: developer

.keywords: PC, shell, set, apply, user-provided

.seealso: PCShellSetApplyRichardson(), PCShellSetSetUp(), PCShellSetApplyTranspose(), PCShellSetPreSolve(), PCShellSetContext()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetPostSolve(PC pc,PetscErrorCode (*postsolve)(void*,KSP,Vec,Vec))
{
  PetscErrorCode ierr,(*f)(PC,PetscErrorCode (*)(void*,KSP,Vec,Vec));

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetPostSolve_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,postsolve);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellSetName"
/*@C
   PCShellSetName - Sets an optional name to associate with a shell
   preconditioner.

   Not Collective

   Input Parameters:
+  pc - the preconditioner context
-  name - character string describing shell preconditioner

   Level: developer

.keywords: PC, shell, set, name, user-provided

.seealso: PCShellGetName()
@*/
PetscErrorCode PETSCKSP_DLLEXPORT PCShellSetName(PC pc,const char name[])
{
  PetscErrorCode ierr,(*f)(PC,const char []);

  PetscFunctionBegin;
  PetscValidHeaderSpecific(pc,PC_COOKIE,1);
  ierr = PetscObjectQueryFunction((PetscObject)pc,"PCShellSetName_C",(void (**)(void))&f);CHKERRQ(ierr);
  if (f) {
    ierr = (*f)(pc,name);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

#undef __FUNCT__  
#define __FUNCT__ "PCShellGetName"
/*@C
   PCShellGetName - Gets an optional name that the user has set for a shell

=== message truncated ===

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