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PETScWrappers::PreconditionShell Class Reference

#include <deal.II/lac/petsc_precondition.h>

Detailed Description

Definition at line 1095 of file petsc_precondition.h.

Inheritance diagram for PETScWrappers::PreconditionShell:
Inheritance graph
[legend]

Public Member Functions

 PreconditionShell ()=default
 PreconditionShell (const MatrixBase &matrix)
 PreconditionShell (const MPI_Comm communicator)
void clear ()
void vmult (VectorBase &dst, const VectorBase &src) const
void Tvmult (VectorBase &dst, const VectorBase &src) const
void setup ()
const PC & get_pc () const
MPI_Comm get_mpi_communicator () const
template<class Archive>
void serialize (Archive &ar, const unsigned int version)
Querying the observer pointers an object has.
unsigned int n_subscriptions () const
template<typename StreamType>
void list_subscribers (StreamType &stream) const
void list_subscribers () const

Static Public Member Functions

static ::ExceptionBase & ExcInUse (int arg1, std::string arg2, std::string arg3)
static ::ExceptionBase & ExcNoSubscriber (std::string arg1, std::string arg2)

Public Attributes

std::function< void(VectorBase &dst, const VectorBase &src)> vmult
std::function< void(VectorBase &dst, const VectorBase &src)> vmultT

Protected Member Functions

void initialize (const MPI_Comm comm)
void initialize (const MatrixBase &matrix)
void create_pc_with_mat (const MatrixBase &)
void create_pc_with_comm (const MPI_Comm)

Protected Attributes

PC pc

Private Types

using map_value_type = decltype(counter_map)::value_type
using map_iterator = decltype(counter_map)::iterator

Private Member Functions

EnableObserverPointer functionality

Classes derived from EnableObserverPointer provide a facility to subscribe to this object. This is mostly used by the ObserverPointer class.

void subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
void unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const
void check_no_subscribers () const noexcept

Static Private Member Functions

static PetscErrorCode pcapply (PC pc, Vec src, Vec dst)
static PetscErrorCode pcapply_transpose (PC pc, Vec src, Vec dst)
static PetscErrorCode pcsetup (PC pc)

Private Attributes

std::atomic< unsigned int > counter
std::map< std::string, unsigned int > counter_map
std::vector< std::atomic< bool > * > validity_pointers
const std::type_info * object_info

Static Private Attributes

static std::mutex mutex

Member Typedef Documentation

◆ map_value_type

using EnableObserverPointer::map_value_type = decltype(counter_map)::value_type
privateinherited

The data type used in counter_map.

Definition at line 224 of file enable_observer_pointer.h.

◆ map_iterator

using EnableObserverPointer::map_iterator = decltype(counter_map)::iterator
privateinherited

The iterator type used in counter_map.

Definition at line 229 of file enable_observer_pointer.h.

Constructor & Destructor Documentation

◆ PreconditionShell() [1/3]

PETScWrappers::PreconditionShell::PreconditionShell ( )
default

Empty Constructor. You need to call initialize() before using this object.

◆ PreconditionShell() [2/3]

PETScWrappers::PreconditionShell::PreconditionShell ( const MatrixBase & matrix)

Constructor. Take the matrix which is used to form the preconditioner.

Definition at line 1053 of file petsc_precondition.cc.

◆ PreconditionShell() [3/3]

PETScWrappers::PreconditionShell::PreconditionShell ( const MPI_Comm communicator)

Same as above but without setting a matrix to form the preconditioner.

Definition at line 1058 of file petsc_precondition.cc.

Member Function Documentation

◆ initialize() [1/2]

void PETScWrappers::PreconditionShell::initialize ( const MPI_Comm comm)
protected

Initialize the preconditioner object without knowing a particular matrix. This function sets up the PCSHELL preconditioner

Definition at line 1064 of file petsc_precondition.cc.

◆ initialize() [2/2]

void PETScWrappers::PreconditionShell::initialize ( const MatrixBase & matrix)
protected

Initialize the preconditioner object with a particular matrix. This function sets up the PCSHELL preconditioner

Definition at line 1089 of file petsc_precondition.cc.

◆ pcapply()

PetscErrorCode PETScWrappers::PreconditionShell::pcapply ( PC pc,
Vec src,
Vec dst )
staticprivate

Callback-function invoked by PCApply

Definition at line 1119 of file petsc_precondition.cc.

◆ pcapply_transpose()

PetscErrorCode PETScWrappers::PreconditionShell::pcapply_transpose ( PC pc,
Vec src,
Vec dst )
staticprivate

Callback-function invoked by PCApplyTranspose

Definition at line 1160 of file petsc_precondition.cc.

◆ pcsetup()

PetscErrorCode PETScWrappers::PreconditionShell::pcsetup ( PC pc)
staticprivate

Callback-function invoked by PCSetUp

Definition at line 1108 of file petsc_precondition.cc.

◆ clear()

void PETScWrappers::PreconditionBase::clear ( )
inherited

Destroys the preconditioner, leaving an object like just after having called the default constructor.

Definition at line 56 of file petsc_precondition.cc.

◆ vmult()

void PETScWrappers::PreconditionBase::vmult ( VectorBase & dst,
const VectorBase & src ) const
inherited

Apply the preconditioner once to the given src vector.

Definition at line 66 of file petsc_precondition.cc.

◆ Tvmult()

void PETScWrappers::PreconditionBase::Tvmult ( VectorBase & dst,
const VectorBase & src ) const
inherited

Apply the transpose preconditioner once to the given src vector.

Definition at line 75 of file petsc_precondition.cc.

◆ setup()

void PETScWrappers::PreconditionBase::setup ( )
inherited

Explicitly call setup. This is usually not needed since PETSc will automatically call the setup function when needed.

Definition at line 84 of file petsc_precondition.cc.

◆ get_pc()

const PC & PETScWrappers::PreconditionBase::get_pc ( ) const
inherited

Give access to the underlying PETSc object.

Definition at line 125 of file petsc_precondition.cc.

◆ get_mpi_communicator()

MPI_Comm PETScWrappers::PreconditionBase::get_mpi_communicator ( ) const
inherited

Return the underlying MPI communicator.

Definition at line 93 of file petsc_precondition.cc.

◆ create_pc_with_mat()

void PETScWrappers::PreconditionBase::create_pc_with_mat ( const MatrixBase & matrix)
protectedinherited

Internal function to create the PETSc preconditioner object. Fails if called twice.

Definition at line 99 of file petsc_precondition.cc.

◆ create_pc_with_comm()

void PETScWrappers::PreconditionBase::create_pc_with_comm ( const MPI_Comm comm)
protectedinherited

Internal function to create the PETSc preconditioner object.

Definition at line 117 of file petsc_precondition.cc.

◆ n_subscriptions()

unsigned int EnableObserverPointer::n_subscriptions ( ) const
inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 339 of file enable_observer_pointer.h.

◆ list_subscribers() [1/2]

template<typename StreamType>
void EnableObserverPointer::list_subscribers ( StreamType & stream) const
inlineinherited

List the subscribers to the input stream.

Definition at line 356 of file enable_observer_pointer.h.

◆ list_subscribers() [2/2]

void EnableObserverPointer::list_subscribers ( ) const
inherited

List the subscribers to deallog.

Definition at line 200 of file enable_observer_pointer.cc.

◆ serialize()

template<class Archive>
void EnableObserverPointer::serialize ( Archive & ar,
const unsigned int version )
inlineinherited

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 348 of file enable_observer_pointer.h.

◆ subscribe()

void EnableObserverPointer::subscribe ( std::atomic< bool > *const validity,
const std::string & identifier = "" ) const
privateinherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 132 of file enable_observer_pointer.cc.

◆ unsubscribe()

void EnableObserverPointer::unsubscribe ( std::atomic< bool > *const validity,
const std::string & identifier = "" ) const
privateinherited

Unsubscribes a user from the object.

Note
The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 152 of file enable_observer_pointer.cc.

◆ check_no_subscribers()

void EnableObserverPointer::check_no_subscribers ( ) const
privatenoexceptinherited

Check that there are no objects subscribing to this object. If this check passes then it is safe to destroy the current object. It this check fails then this function will either abort or print an error message to deallog (by using the AssertNothrow mechanism), but will not throw an exception.

Note
Since this function is just a consistency check it does nothing in release mode.
If this function is called when there is an uncaught exception then, rather than aborting, this function prints an error message to the standard error stream and returns.

Definition at line 54 of file enable_observer_pointer.cc.

Member Data Documentation

◆ vmult

std::function<void(VectorBase &dst, const VectorBase &src)> PETScWrappers::PreconditionShell::vmult

The callback for the application of the preconditioner.

Note
This variable represents a user provided callback. See there for a description of how to deal with errors and other requirements and conventions.

Definition at line 1122 of file petsc_precondition.h.

◆ vmultT

std::function<void(VectorBase &dst, const VectorBase &src)> PETScWrappers::PreconditionShell::vmultT

The callback for the transposed application of the preconditioner.

Note
This variable represents a user provided callback. See there for a description of how to deal with errors and other requirements and conventions.

Definition at line 1132 of file petsc_precondition.h.

◆ pc

PC PETScWrappers::PreconditionBase::pc
protectedinherited

The PETSc preconditioner object

Definition at line 121 of file petsc_precondition.h.

◆ counter

std::atomic<unsigned int> EnableObserverPointer::counter
mutableprivateinherited

Store the number of objects which subscribed to this object. Initially, this number is zero, and upon destruction it shall be zero again (i.e. all objects which subscribed should have unsubscribed again).

The creator (and owner) of an object is counted in the map below if HE manages to supply identification.

We use the mutable keyword in order to allow subscription to constant objects also.

This counter may be read from and written to concurrently in multithreaded code: hence we use the std::atomic class template.

Definition at line 213 of file enable_observer_pointer.h.

◆ counter_map

std::map<std::string, unsigned int> EnableObserverPointer::counter_map
mutableprivateinherited

In this map, we count subscriptions for each different identification string supplied to subscribe().

Definition at line 219 of file enable_observer_pointer.h.

◆ validity_pointers

std::vector<std::atomic<bool> *> EnableObserverPointer::validity_pointers
mutableprivateinherited

In this vector, we store pointers to the validity bool in the ObserverPointer objects that subscribe to this class.

Definition at line 235 of file enable_observer_pointer.h.

◆ object_info

const std::type_info* EnableObserverPointer::object_info
mutableprivateinherited

Pointer to the typeinfo object of this object, from which we can later deduce the class name. Since this information on the derived class is neither available in the destructor, nor in the constructor, we obtain it in between and store it here.

Definition at line 243 of file enable_observer_pointer.h.

◆ mutex

std::mutex EnableObserverPointer::mutex
staticprivateinherited

A mutex used to ensure data consistency when accessing the mutable members of this class. This lock is used in the subscribe() and unsubscribe() functions, as well as in list_subscribers().

Definition at line 250 of file enable_observer_pointer.h.

The documentation for this class was generated from the following files: