deal.II version GIT relicensing-2009-g9627ae39f5 2024-10-19 11:10:00+00:00
\(\newcommand{\dealvcentcolon}{\mathrel{\mathop{:}}}\) \(\newcommand{\dealcoloneq}{\dealvcentcolon\mathrel{\mkern-1.2mu}=}\) \(\newcommand{\jump}[1]{\left[\!\left[ #1 \right]\!\right]}\) \(\newcommand{\average}[1]{\left\{\!\left\{ #1 \right\}\!\right\}}\)
Loading...
Searching...
No Matches
Public Member Functions | Static Public Member Functions | Private Types | Private Member Functions | Private Attributes | Static Private Attributes | List of all members
EnableObserverPointer Class Reference

#include <deal.II/base/enable_observer_pointer.h>

Inherited by AffineConstraints< Number >, AffineConstraints< double >, AffineConstraints< value_type >, AffineConstraints< typename MatrixType::value_type >, AffineConstraints< typename VectorType::value_type >, BlockMatrixBase< SparseMatrix< number > >, BlockMatrixBase< SparseMatrix< Number, ::MemorySpace::Host > >, BlockMatrixBase< SparseMatrix >, BlockMatrixBase< SparseMatrix< double > >, DataPostprocessor< spacedim >, DiagonalMatrix< LinearAlgebra::distributed::Vector< double > >, DoFHandler< dim, spacedim >, DoFHandler< dim, dim >, DoFHandler< patch_dim, spacedim >, DoFHandler< 1, spacedim >, FETools::FEFactoryBase< FE::dimension, FE::space_dimension >, FEValuesBase< dim, dim >, FEValuesBase< dim1, dim1 >, FiniteElement< dim, spacedim >, FiniteElement< dim, dim >, FiniteElement< 1, spacedim >, FiniteElement< 2, 2 >, FiniteElement< PolynomialType::dimension+1, PolynomialType::dimension+1 >, Function< dim, double >, Function< dim, VectorType::value_type >, Function< 2 >, Function< 1 >, Function< dim+1 >, GridTools::Cache< dim, dim >, LinearAlgebra::TpetraWrappers::SparseMatrix< Number, MemorySpace >, MGCoarseGridBase< Vector< double > >, MGLevelObject< RelaxationType >, MGLevelObject< LinearAlgebra::distributed::Vector< Number > >, MGLevelObject< MatrixType >, MGLevelObject< LinearOperator< BlockVector< number > > >, MGLevelObject< PreconditionerType >, MGLevelObject< LinearOperator< VectorType > >, MGLevelObject< MGTwoLevelTransfer< dim, LinearAlgebra::distributed::Vector > >, MGLevelObject< ObserverPointer< MGTwoLevelTransferBase< LinearAlgebra::distributed::Vector > > >, MGLevelObject< std::shared_ptr< const Utilities::MPI::Partitioner > >, MGLevelObject< VectorType >, MGLevelObject< LinearOperator< Vector< double > > >, MGLevelObject< SparsityPattern >, MGLevelObject< SparseMatrix< number > >, MGMatrixBase< Vector< number > >, MGMatrixBase< Vector< double > >, MGSmootherBase< BlockVector< number > >, MGSmootherBase< Vector< double > >, MGTransferBase< LinearAlgebra::distributed::Vector< Number > >, MGTransferBase< BlockVector< number > >, MGTransferBase< LinearAlgebra::distributed::BlockVector< Number > >, MGTransferBase< Vector< number > >, MGTwoLevelTransferBase< LinearAlgebra::distributed::Vector >, Manifold< dim, spacedim >, Manifold< dim, dim >, Mapping< dim, spacedim >, Mapping< dim, dim >, Mapping< patch_dim, spacedim >, MatrixBlock< FullMatrix< double > >, MatrixBlock< FullMatrix< number > >, MatrixFree< dim, Number, VectorizedArrayType >, MatrixFree< dim, double, VectorizedArray< double > >, MatrixFree< dim, value_type, VectorizedArray< typename VectorType::value_type > >, MatrixFree< dim, Number >, MatrixFree< dim, Number, VectorizedArray< Number > >, MatrixFreeOperators::Base< dim, LinearAlgebra::distributed::Vector< double >, VectorizedArray< typename VectorType::value_type > >, NonMatching::MappingInfo< dim, spacedim, double >, NonMatching::MappingInfo< dim, dim, double >, NonMatching::MappingInfo< dim, dim, Number >, Polynomials::Polynomial< double >, PreconditionBlock< MatrixType, typename MatrixType::value_type > [virtual], PreconditionBlock< MatrixType, inverse_type > [virtual], PreconditionBlockJacobi< MatrixType, inverse_type > [virtual], PreconditionBlockSOR< MatrixType, typename MatrixType::value_type > [virtual], PreconditionRelaxation< SparseMatrix< double >, internal::PreconditionRelaxation::PreconditionJacobiImpl< SparseMatrix< double > > >, PreconditionRelaxation< SparseMatrix< double >, internal::PreconditionRelaxation::PreconditionPSORImpl< SparseMatrix< double > > >, PreconditionRelaxation< SparseMatrix< double >, internal::PreconditionRelaxation::PreconditionSORImpl< SparseMatrix< double > > >, PreconditionRelaxation< SparseMatrix< double >, internal::PreconditionRelaxation::PreconditionSSORImpl< SparseMatrix< double > > >, Quadrature< 1 >, Quadrature< dim - 1 >, Quadrature< 0 >, Quadrature< structdim >, ReadVector< VectorType::value_type >, ReadVector< VectorTraits::value_type >, ReadVector< double >, ReadVector< PetscScalar >, ReadVector< TrilinosScalar >, ReadVector< typename VectorType::value_type >, ReadVector< number >, SolverBase< Vector< double > >, SolverBase< VectorType >, SparseMatrix< double > [virtual], TableBase< 2, number >, TableBase< 2, typename MatrixType::value_type >, TableBase< 2, NumberType >, TableBase< 1, T >, TableBase< 2, T >, TableBase< 3, T >, TableBase< 4, T >, TableBase< 5, T >, TableBase< 6, T >, TableBase< 7, T >, TableBase< 2, Number >, TableBase< 2, double >, TableBase< 2, inverse_type >, TableBase< 2, InverseNumberType >, TensorFunction< rank, dim, double >, TensorFunction< 1, dim, double >, Triangulation< dim, spacedim >, Triangulation< dim, dim >, Triangulation< dimension, space_dimension >, Triangulation< 1, spacedim >, VectorMemory< Vector< double > >, VectorMemory< ::Vector< double > >, VectorMemory< BlockVector< number > >, VectorMemory< VectorType >, VectorMemory< Vector< number > >, hp::Collection< FiniteElement< dim, spacedim > >, hp::Collection< Mapping< dim, spacedim > >, hp::Collection< Quadrature< dim > >, hp::Collection< FiniteElement< dim, dim > >, hp::Collection< Mapping< dim, dim > >, hp::FEValuesBase< dim, dim - 1, ::FEFaceValues< dim, dim > >, hp::FEValuesBase< dim, dim, ::FEValues< dim, dim > >, AffineConstraints< number >, Algorithms::OperatorBase, Algorithms::OutputOperator< VectorType >, Algorithms::TimestepControl, AnyData, ArpackSolver, BlockIndices, BlockInfo, BlockMatrixBase< MatrixType >, BlockSparseMatrixEZ< Number >, CellDataStorage< CellIteratorType, DataType >, ChunkSparseMatrix< number > [virtual], ChunkSparsityPattern, DataPostprocessor< dim >, DiagonalMatrix< VectorType >, DoFHandler< dim, spacedim >, FERemoteEvaluationCommunicator< dim >, FESeries::Fourier< dim, spacedim >, FESeries::Legendre< dim, spacedim >, FETools::FEFactoryBase< dim, spacedim >, FEValuesBase< dim, spacedim >, FiniteElement< dim, spacedim >, Function< dim, RangeNumberType >, GeneralDataStorage, GridTools::Cache< dim, spacedim >, InterGridMap< MeshType >, LinearAlgebra::TpetraWrappers::PreconditionBase< Number, MemorySpace >, LinearAlgebra::TpetraWrappers::SparseMatrix< Number, MemorySpace >, LogStream, MGCoarseGridBase< VectorType >, MGConstrainedDoFs, MGLevelObject< Object >, MGMatrixBase< VectorType >, MGMatrixBlockVector< MatrixType >, MGSmootherBase< VectorType >, MGTransferBase< VectorType >, MGTwoLevelTransferBase< VectorType >, Manifold< dim, spacedim >, Mapping< dim, spacedim >, MatrixBlock< MatrixType >, MatrixFree< dim, Number, VectorizedArrayType >, MatrixFreeOperators::Base< dim, VectorType, VectorizedArrayType >, MatrixFreeOperators::MGInterfaceOperator< OperatorType >, MeshWorker::LocalIntegrator< dim, spacedim, number >, MeshWorker::VectorSelector, Multigrid< VectorType >, NonMatching::MappingInfo< dim, spacedim, Number >, NonMatching::MeshClassifier< dim >, PArpackSolver< VectorType >, PETScWrappers::MatrixBase, PETScWrappers::PreconditionBase, ParameterAcceptor, ParameterHandler, Particles::ParticleHandler< dim, spacedim >, Polynomials::PiecewisePolynomial< number >, Polynomials::Polynomial< number >, Portable::MatrixFree< dim, Number >, PreconditionBlock< MatrixType, inverse_type > [virtual], PreconditionBlockJacobi< MatrixType, inverse_type > [virtual], PreconditionBlockSOR< MatrixType, inverse_type > [virtual], PreconditionBlockSSOR< MatrixType, inverse_type > [virtual], PreconditionChebyshev< MatrixType, VectorType, PreconditionerType >, PreconditionIdentity, PreconditionLU< number >, PreconditionMG< dim, VectorType, TransferType >, PreconditionRelaxation< MatrixType, PreconditionerType >, PreconditionRichardson, PreconditionSelector< MatrixType, VectorType >, PreconditionUseMatrix< MatrixType, VectorType >, Quadrature< dim >, ReadVector< Number >, RelaxationBlock< MatrixType, InverseNumberType, VectorType >::AdditionalData, RelaxationBlockJacobi< MatrixType, InverseNumberType, VectorType > [virtual], RelaxationBlockSOR< MatrixType, InverseNumberType, VectorType > [virtual], RelaxationBlockSSOR< MatrixType, InverseNumberType, VectorType > [virtual], RepartitioningPolicyTools::Base< dim, spacedim >, SolverBase< VectorType >, SolverControl, SolverSelector< VectorType >, SparseDirectUMFPACK, SparseLUDecomposition< number > [virtual], SparseMatrix< number > [virtual], SparseMatrixEZ< number >, SparsityPatternBase, TableBase< N, T >, TensorFunction< rank, dim, Number >, TimeStepBase, Triangulation< dim, spacedim >, TrilinosWrappers::PreconditionBase, TrilinosWrappers::SolverDirect, TrilinosWrappers::SparseMatrix, VectorMemory< VectorType >, hp::Collection< T >, hp::FEValuesBase< dim, q_dim, FEValuesType >, internal::parallel::shared::TemporarilyRestoreSubdomainIds< dim, spacedim >, mg::SparseMatrixCollection< number >, and parallel::distributed::TemporarilyMatchRefineFlags< dim, spacedim >.

Public Member Functions

 EnableObserverPointer ()
 
 EnableObserverPointer (const EnableObserverPointer &)
 
 EnableObserverPointer (EnableObserverPointer &&) noexcept
 
virtual ~EnableObserverPointer ()
 
EnableObserverPointeroperator= (const EnableObserverPointer &)
 
EnableObserverPointeroperator= (EnableObserverPointer &&) noexcept
 
template<class Archive >
void serialize (Archive &ar, const unsigned int version)
 
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
 
unsigned int n_subscriptions () const
 
template<typename StreamType >
void list_subscribers (StreamType &stream) const
 
void list_subscribers () const
 

Static Public Member Functions

static ::ExceptionBaseExcInUse (int arg1, std::string arg2, std::string arg3)
 
static ::ExceptionBaseExcNoSubscriber (std::string arg1, std::string arg2)
 

Private Types

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

Private Member Functions

void check_no_subscribers () const noexcept
 

Private Attributes

std::atomic< unsigned intcounter
 
std::map< std::string, unsigned intcounter_map
 
std::vector< std::atomic< bool > * > validity_pointers
 
const std::type_info * object_info
 

Static Private Attributes

static std::mutex mutex
 

Detailed Description

Handling of subscriptions.

This class, as a base class, allows to keep track of other objects using a specific object. It is used to avoid that pointers that point to an object of a class derived from EnableObserverPointer are referenced after that object has been invalidated. Here, invalidation is assumed to happen when the object is moved from or destroyed. The mechanism works as follows: The member function subscribe() accepts a pointer to a boolean that is modified on invalidation. The object that owns this pointer (usually an object of class type ObserverPointer) is then expected to check the state of the boolean before trying to access this class.

The utility of this class is even enhanced by providing identifying strings to the functions subscribe() and unsubscribe(). These strings are represented as const char pointers since the underlying buffer comes from (and is managed by) the run-time type information system: more exactly, these pointers are the result the function call typeid(x).name() where x is some object. Therefore, the pointers provided to subscribe() and to unsubscribe() must be the same. Strings with equal contents will not be recognized to be the same. The handling in ObserverPointer will take care of this. The current subscribers to this class can be obtained by calling list_subscribers().

Definition at line 59 of file enable_observer_pointer.h.

Member Typedef Documentation

◆ map_value_type

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

The data type used in counter_map.

Definition at line 231 of file enable_observer_pointer.h.

◆ map_iterator

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

The iterator type used in counter_map.

Definition at line 236 of file enable_observer_pointer.h.

Constructor & Destructor Documentation

◆ EnableObserverPointer() [1/3]

EnableObserverPointer::EnableObserverPointer ( )
inline

Constructor setting the counter to zero.

Definition at line 290 of file enable_observer_pointer.h.

◆ EnableObserverPointer() [2/3]

EnableObserverPointer::EnableObserverPointer ( const EnableObserverPointer )
inline

Copy-constructor.

The counter of the copy is zero, since references point to the original object.

Definition at line 297 of file enable_observer_pointer.h.

◆ EnableObserverPointer() [3/3]

EnableObserverPointer::EnableObserverPointer ( EnableObserverPointer &&  subscriptor)
noexcept

Move constructor.

An object inheriting from EnableObserverPointer can only be moved if no other objects are subscribing to it.

Definition at line 32 of file enable_observer_pointer.cc.

◆ ~EnableObserverPointer()

EnableObserverPointer::~EnableObserverPointer ( )
virtual

Destructor, asserting that the counter is zero.

Definition at line 44 of file enable_observer_pointer.cc.

Member Function Documentation

◆ operator=() [1/2]

EnableObserverPointer & EnableObserverPointer::operator= ( const EnableObserverPointer s)
inline

Assignment operator.

This has to be handled with care, too, because the counter has to remain the same. It therefore does nothing more than returning *this.

Definition at line 306 of file enable_observer_pointer.h.

◆ operator=() [2/2]

EnableObserverPointer & EnableObserverPointer::operator= ( EnableObserverPointer &&  s)
noexcept

Move assignment operator. Only invalidates the object moved from.

Definition at line 119 of file enable_observer_pointer.cc.

◆ subscribe()

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

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

Definition at line 131 of file enable_observer_pointer.cc.

◆ unsubscribe()

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

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 151 of file enable_observer_pointer.cc.

◆ n_subscriptions()

unsigned int EnableObserverPointer::n_subscriptions ( ) const
inline

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 315 of file enable_observer_pointer.h.

◆ list_subscribers() [1/2]

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

List the subscribers to the input stream.

Definition at line 332 of file enable_observer_pointer.h.

◆ list_subscribers() [2/2]

void EnableObserverPointer::list_subscribers ( ) const

List the subscribers to deallog.

Definition at line 199 of file enable_observer_pointer.cc.

◆ serialize()

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

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 324 of file enable_observer_pointer.h.

◆ check_no_subscribers()

void EnableObserverPointer::check_no_subscribers ( ) const
privatenoexcept

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 53 of file enable_observer_pointer.cc.

Member Data Documentation

◆ counter

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

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 220 of file enable_observer_pointer.h.

◆ counter_map

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

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

Definition at line 226 of file enable_observer_pointer.h.

◆ validity_pointers

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

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

Definition at line 242 of file enable_observer_pointer.h.

◆ object_info

const std::type_info* EnableObserverPointer::object_info
mutableprivate

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 250 of file enable_observer_pointer.h.

◆ mutex

std::mutex EnableObserverPointer::mutex
staticprivate

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 273 of file enable_observer_pointer.h.


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