Logo ROOT  
Reference Guide
 
Loading...
Searching...
No Matches
TMemFile Class Reference

A TMemFile is like a normal TFile except that it reads and writes only from memory.

Definition at line 19 of file TMemFile.h.

Classes

struct  TMemBlock
 
struct  ZeroCopyView_t
 A read-only memory range which we do not control. More...
 

Public Types

using ExternalDataPtr_t = std::shared_ptr< const std::vector< char > >
 
- Public Types inherited from TFile
enum  { kStartBigFile = 2000000000 }
 
enum  EAsyncOpenStatus { kAOSNotAsync = -1 , kAOSFailure = 0 , kAOSInProgress = 1 , kAOSSuccess = 2 }
 Asynchronous open request status. More...
 
enum  ECacheAction { kDisconnect = 0 , kDoNotDisconnect = 1 }
 TTreeCache flushing semantics. More...
 
enum  EFileType {
  kDefault = 0 , kLocal = 1 , kNet = 2 , kWeb = 3 ,
  kFile = 4 , kMerge = 5
}
 File type. More...
 
enum  EOpenTimeOut { kInstantTimeout = 0 , kEternalTimeout = 999999999 }
 Open timeout constants. More...
 
enum  ERelativeTo { kBeg = 0 , kCur = 1 , kEnd = 2 }
 
enum  EStatusBits {
  kRecovered = (1ULL << ( 10 )) , kHasReferences = (1ULL << ( 11 )) , kDevNull = (1ULL << ( 12 )) , kWriteError = (1ULL << ( 14 )) ,
  kBinaryFile = (1ULL << ( 15 )) , kRedirected = (1ULL << ( 16 )) , kReproducible = (1ULL << ( 17 ))
}
 TFile status bits. BIT(13) is taken up by TObject. More...
 
- Public Types inherited from TDirectoryFile
enum  EStatusBits { kCloseDirectory = (1ULL << ( 7 )) }
 
- Public Types inherited from TObject
enum  {
  kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 ,
  kBitMask = 0x00ffffff
}
 
enum  { kSingleKey = (1ULL << ( 0 )) , kOverwrite = (1ULL << ( 1 )) , kWriteDelete = (1ULL << ( 2 )) }
 
enum  EDeprecatedStatusBits { kObjInCanvas = (1ULL << ( 3 )) }
 
enum  EStatusBits {
  kCanDelete = (1ULL << ( 0 )) , kMustCleanup = (1ULL << ( 3 )) , kIsReferenced = (1ULL << ( 4 )) , kHasUUID = (1ULL << ( 5 )) ,
  kCannotPick = (1ULL << ( 6 )) , kNoContextMenu = (1ULL << ( 8 )) , kInvalidObject = (1ULL << ( 13 ))
}
 

Public Member Functions

 TMemFile (const char *name, char *buffer, Long64_t size, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Long64_t defBlockSize=0LL)
 Usual Constructor. See the TFile constructor for details. Copy data from buffer.
 
 TMemFile (const char *name, const ZeroCopyView_t &datarange)
 Constructor to create a TMemFile re-using external C-Style storage.
 
 TMemFile (const char *name, ExternalDataPtr_t data)
 Constructor to create a TMemFile re-using external storage.
 
 TMemFile (const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Long64_t defBlockSize=0LL)
 Usual Constructor.
 
 TMemFile (const char *name, std::unique_ptr< TBufferFile > buffer)
 Constructor to create a read-only TMemFile using an std::unique_ptr<TBufferFile>
 
 TMemFile (const TMemFile &orig)
 Copying the content of the TMemFile into another TMemFile.
 
 ~TMemFile () override
 Close and clean-up file.
 
virtual void CopyTo (TBuffer &tobuf) const
 Copy the binary representation of the TMemFile into the TBuffer tobuf.
 
virtual Long64_t CopyTo (void *to, Long64_t maxsize) const
 Copy the binary representation of the TMemFile into the memory area starting at 'to' and of length at most 'maxsize' returns the number of bytes actually copied.
 
Long64_t GetSize () const override
 Return the current size of the memory file.
 
TClassIsA () const override
 
void Print (Option_t *option="") const override
 Print all objects in the file.
 
void ResetAfterMerge (TFileMergeInfo *) override
 Wipe all the data from the permanent buffer but keep, the in-memory object alive.
 
void ResetErrno () const override
 Simply calls TSystem::ResetErrno().
 
void Streamer (TBuffer &) override
 Stream a TFile object.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
- Public Member Functions inherited from TFile
 TFile ()
 File default Constructor.
 
 TFile (const char *fname, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault)
 Opens or creates a local ROOT file.
 
 ~TFile () override
 File destructor.
 
void Close (Option_t *option="") override
 Close a file.
 
void Copy (TObject &) const override
 Copy this to obj.
 
virtual Bool_t Cp (const char *dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
 Allows to copy this file to the dst URL.
 
virtual TKeyCreateKey (TDirectory *mother, const TObject *obj, const char *name, Int_t bufsize)
 Creates key for object and converts data to buffer.
 
virtual TKeyCreateKey (TDirectory *mother, const void *obj, const TClass *cl, const char *name, Int_t bufsize)
 Creates key for object and converts data to buffer.
 
void Delete (const char *namecycle="") override
 Delete object namecycle.
 
void Draw (Option_t *option="") override
 Fill Graphics Structure and Paint.
 
virtual void DrawMap (const char *keys="*", Option_t *option="")
 Draw map of objects in this file.
 
void FillBuffer (char *&buffer) override
 Encode file output buffer.
 
virtual void Flush ()
 Synchronize a file's in-memory and on-disk states.
 
TArchiveFileGetArchive () const
 
Long64_t GetArchiveOffset () const
 
Int_t GetBestBuffer () const
 Return the best buffer size of objects on this file.
 
virtual Long64_t GetBytesRead () const
 
virtual Long64_t GetBytesReadExtra () const
 
virtual Int_t GetBytesToPrefetch () const
 Max number of bytes to prefetch.
 
virtual Long64_t GetBytesWritten () const
 Return the total number of bytes written so far to the file.
 
TFileCacheReadGetCacheRead (const TObject *tree=nullptr) const
 Return a pointer to the current read cache.
 
TFileCacheWriteGetCacheWrite () const
 Return a pointer to the current write cache.
 
TArrayCGetClassIndex () const
 
Int_t GetCompressionAlgorithm () const
 
Float_t GetCompressionFactor ()
 Return the file compression factor.
 
Int_t GetCompressionLevel () const
 
Int_t GetCompressionSettings () const
 
virtual Long64_t GetEND () const
 
virtual const TUrlGetEndpointUrl () const
 
virtual Int_t GetErrno () const
 Method returning errno.
 
Int_t GetFd () const
 
TListGetListOfFree () const
 
TObjArrayGetListOfProcessIDs () const
 
virtual Int_t GetNbytesFree () const
 
virtual Int_t GetNbytesInfo () const
 
virtual TString GetNewUrl ()
 
virtual Int_t GetNfree () const
 
virtual Int_t GetNProcessIDs () const
 
Option_tGetOption () const override
 
virtual Int_t GetReadCalls () const
 
Int_t GetRecordHeader (char *buf, Long64_t first, Int_t maxbytes, Int_t &nbytes, Int_t &objlen, Int_t &keylen)
 Read the logical record header starting at a certain postion.
 
Long64_t GetRelOffset () const
 
virtual Long64_t GetSeekFree () const
 
virtual Long64_t GetSeekInfo () const
 
const TListGetStreamerInfoCache ()
 Returns the cached list of StreamerInfos used in this file.
 
virtual TListGetStreamerInfoList () final
 Read the list of TStreamerInfo objects written to this file.
 
Int_t GetVersion () const
 
virtual void IncrementProcessIDs ()
 
virtual Bool_t IsArchive () const
 
Bool_t IsBinary () const
 
virtual Bool_t IsOpen () const
 Returns kTRUE in case file is open and kFALSE if file is not open.
 
Bool_t IsRaw () const
 
void ls (Option_t *option="") const override
 List file contents.
 
virtual void MakeFree (Long64_t first, Long64_t last)
 Mark unused bytes on the file.
 
virtual void MakeProject (const char *dirname, const char *classes="*", Option_t *option="new")
 Generate source code necessary to access the objects stored in the file.
 
virtual void Map ()
 
virtual void Map (Option_t *opt)
 List the contents of a file sequentially.
 
virtual Bool_t Matches (const char *name)
 Return kTRUE if 'url' matches the coordinates of this file.
 
virtual Bool_t MustFlush () const
 
void Paint (Option_t *option="") override
 Paint all objects in the file.
 
virtual Bool_t ReadBuffer (char *buf, Int_t len)
 Read a buffer from the file.
 
virtual Bool_t ReadBuffer (char *buf, Long64_t pos, Int_t len)
 Read a buffer from the file at the offset 'pos' in the file.
 
virtual Bool_t ReadBufferAsync (Long64_t offs, Int_t len)
 
virtual Bool_t ReadBuffers (char *buf, Long64_t *pos, Int_t *len, Int_t nbuf)
 Read the nbuf blocks described in arrays pos and len.
 
virtual void ReadFree ()
 Read the FREE linked list.
 
virtual TProcessIDReadProcessID (UShort_t pidf)
 The TProcessID with number pidf is read from this file.
 
virtual void ReadStreamerInfo ()
 Read the list of StreamerInfo from this file.
 
virtual Int_t Recover ()
 Attempt to recover file if not correctly closed.
 
virtual Int_t ReOpen (Option_t *mode)
 Reopen a file with a different access mode.
 
virtual void Seek (Long64_t offset, ERelativeTo pos=kBeg)
 Seek to a specific position in the file. Pos it either kBeg, kCur or kEnd.
 
virtual void SetCacheRead (TFileCacheRead *cache, TObject *tree=nullptr, ECacheAction action=kDisconnect)
 Set a pointer to the read cache.
 
virtual void SetCacheWrite (TFileCacheWrite *cache)
 Set a pointer to the write cache.
 
virtual void SetCompressionAlgorithm (Int_t algorithm=ROOT::RCompressionSetting::EAlgorithm::kUseGlobal)
 See comments for function SetCompressionSettings.
 
virtual void SetCompressionLevel (Int_t level=ROOT::RCompressionSetting::ELevel::kUseMin)
 See comments for function SetCompressionSettings.
 
virtual void SetCompressionSettings (Int_t settings=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault)
 Used to specify the compression level and algorithm.
 
virtual void SetEND (Long64_t last)
 
virtual void SetOffset (Long64_t offset, ERelativeTo pos=kBeg)
 Set position from where to start reading.
 
virtual void SetOption (Option_t *option=">")
 
virtual void SetReadCalls (Int_t readcalls=0)
 
virtual void ShowStreamerInfo ()
 Show the StreamerInfo of all classes written to this file.
 
Int_t Sizeof () const override
 Return the size in bytes of the file header.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
void SumBuffer (Int_t bufsize)
 Increment statistics for buffer sizes of objects in this file.
 
Int_t Write (const char *name=nullptr, Int_t opt=0, Int_t bufsiz=0) const override
 One can not save a const TDirectory object.
 
Int_t Write (const char *name=nullptr, Int_t opt=0, Int_t bufsiz=0) override
 Write memory objects to this file.
 
virtual Bool_t WriteBuffer (const char *buf, Int_t len)
 Write a buffer to the file.
 
virtual void WriteFree ()
 Write FREE linked list on the file.
 
virtual void WriteHeader ()
 Write File Header.
 
virtual UShort_t WriteProcessID (TProcessID *pid)
 Check if the ProcessID pidd is already in the file, if not, add it and return the index number in the local file list.
 
virtual void WriteStreamerInfo ()
 Write the list of TStreamerInfo as a single object in this file The class Streamer description for all classes written to this file is saved.
 
- Public Member Functions inherited from TDirectoryFile
 TDirectoryFile ()
 Default TDirectoryFile constructor.
 
 TDirectoryFile (const char *name, const char *title, Option_t *option="", TDirectory *motherDir=nullptr)
 Create a new TDirectoryFile.
 
 ~TDirectoryFile () override
 Destructor.
 
void Add (TObject *obj, Bool_t replace=kFALSE) override
 
void Append (TObject *obj, Bool_t replace=kFALSE) override
 Append object to this directory.
 
Int_t AppendKey (TKey *key) override
 Insert key in the linked list of keys of this directory.
 
void Browse (TBrowser *b) override
 Browse the content of the directory.
 
void Build (TFile *motherFile=nullptr, TDirectory *motherDir=nullptr) override
 
Bool_t cd () override
 Change current directory to "this" directory.
 
Bool_t cd (const char *path) override
 Change current directory the directory described by the path if given one.
 
TObjectCloneObject (const TObject *obj, Bool_t autoadd=kTRUE) override
 Make a clone of an object using the Streamer facility.
 
TKeyFindKey (const char *keyname) const override
 Find key with name keyname in the current directory.
 
TKeyFindKeyAny (const char *keyname) const override
 Find key with name keyname in the current directory or its subdirectories.
 
TObjectFindObjectAny (const char *name) const override
 Find object by name in the list of memory objects of the current directory or its sub-directories.
 
TObjectFindObjectAnyFile (const char *name) const override
 Scan the memory lists of all files for an object with name.
 
template<class T >
T * Get (const char *namecycle)
 See documentation of TDirectoryFile::Get(const char *namecycle)
 
TObjectGet (const char *namecycle) override
 Return pointer to object identified by namecycle.
 
Int_t GetBufferSize () const override
 Return the buffer size to create new TKeys.
 
const TDatimeGetCreationDate () const
 
TDirectoryGetDirectory (const char *apath, Bool_t printError=false, const char *funcname="GetDirectory") override
 Find a directory named "apath".
 
TFileGetFile () const override
 
TKeyGetKey (const char *name, Short_t cycle=9999) const override
 Return pointer to key with name,cycle.
 
TListGetListOfKeys () const override
 
const TDatimeGetModificationDate () const
 
Int_t GetNbytesKeys () const override
 
Int_t GetNkeys () const override
 
void * GetObjectChecked (const char *namecycle, const char *classname) override
 See documentation of TDirectoryFile::GetObjectCheck(const char *namecycle, const TClass *cl)
 
void * GetObjectChecked (const char *namecycle, const TClass *cl) override
 Return pointer to object identified by namecycle if and only if the actual object is a type suitable to be stored as a pointer to a "expectedClass" If expectedClass is null, no check is performed.
 
void * GetObjectUnchecked (const char *namecycle) override
 Return pointer to object identified by namecycle.
 
Long64_t GetSeekDir () const override
 
Long64_t GetSeekKeys () const override
 
Long64_t GetSeekParent () const override
 
Bool_t IsModified () const override
 
Bool_t IsWritable () const override
 
TDirectorymkdir (const char *name, const char *title="", Bool_t returnExistingDirectory=kFALSE) override
 Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...".
 
TFileOpenFile (const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0) override
 Interface to TFile::Open.
 
void Purge (Short_t nkeep=1) override
 Purge lowest key cycles in a directory.
 
void ReadAll (Option_t *option="") override
 Read objects from a ROOT file directory into memory.
 
Int_t ReadKeys (Bool_t forceRead=kTRUE) override
 Read the linked list of keys.
 
Int_t ReadTObject (TObject *obj, const char *keyname) override
 Read object with keyname from the current directory.
 
void rmdir (const char *name) override
 Removes subdirectory from the directory.
 
void Save () override
 Save recursively all directory keys and headers.
 
Int_t SaveObjectAs (const TObject *obj, const char *filename="", Option_t *option="") const override
 Save object in filename.
 
void SaveSelf (Bool_t force=kFALSE) override
 Save Directory keys and header.
 
void SetBufferSize (Int_t bufsize) override
 Set the default buffer size when creating new TKeys.
 
void SetModified () override
 
void SetSeekDir (Long64_t v) override
 
void SetTRefAction (TObject *ref, TObject *parent) override
 Find the action to be executed in the dictionary of the parent class and store the corresponding exec number into fBits.
 
void SetWritable (Bool_t writable=kTRUE) override
 Set the new value of fWritable recursively.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
void WriteDirHeader () override
 Overwrite the Directory header record.
 
void WriteKeys () override
 Write Keys linked list on the file.
 
Int_t WriteObjectAny (const void *obj, const char *classname, const char *name, Option_t *option="", Int_t bufsize=0) override
 Write object from pointer of class classname in this directory.
 
Int_t WriteObjectAny (const void *obj, const TClass *cl, const char *name, Option_t *option="", Int_t bufsize=0) override
 Write object of class with dictionary cl in this directory.
 
Int_t WriteTObject (const TObject *obj, const char *name=nullptr, Option_t *option="", Int_t bufsize=0) override
 Write object obj to this directory.
 
- Public Member Functions inherited from TDirectory
 TDirectory ()
 Directory default constructor.
 
 TDirectory (const char *name, const char *title, Option_t *option="", TDirectory *motherDir=nullptr)
 Create a new Directory.
 
virtual ~TDirectory ()
 Destructor.
 
void Clear (Option_t *option="") override
 Delete all objects from a Directory list.
 
virtual void DeleteAll (Option_t *option="")
 Delete all objects from memory.
 
TObjectFindObject (const char *name) const override
 Find object by name in the list of memory objects.
 
TObjectFindObject (const TObject *obj) const override
 Find object in the list of memory objects.
 
template<class T >
T * Get (const char *namecycle)
 See documentation of TDirectoryFile::Get(const char *namecycle)
 
virtual TListGetList () const
 
TObjectGetMother () const
 
TDirectoryGetMotherDir () const
 
template<class T >
void GetObject (const char *namecycle, T *&ptr)
 Get an object with proper type checking.
 
virtual const char * GetPath () const
 Returns the full path of the directory.
 
virtual const char * GetPathStatic () const
 Returns the full path of the directory.
 
TUUID GetUUID () const
 
Bool_t IsBuilt () const
 
Bool_t IsFolder () const override
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects).
 
virtual void pwd () const
 Print the path of the directory.
 
void RecursiveRemove (TObject *obj) override
 Recursively remove object from a Directory.
 
virtual TObjectRemove (TObject *)
 Remove an object from the in-memory list.
 
virtual void SetMother (TObject *mother)
 
void SetName (const char *newname) override
 Set the name for directory If the directory name is changed after the directory was written once, ROOT currently would NOT change the name of correspondent key in the mother directory.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
template<typename T >
std::enable_if_t<!std::is_base_of< TObject, T >::value, Int_tWriteObject (const T *obj, const char *name, Option_t *option="", Int_t bufsize=0)
 Write an object with proper type checking.
 
template<typename T >
std::enable_if_t< std::is_base_of< TObject, T >::value, Int_tWriteObject (const T *obj, const char *name, Option_t *option="", Int_t bufsize=0)
 Write an object with proper type checking.
 
- Public Member Functions inherited from TNamed
 TNamed ()
 
 TNamed (const char *name, const char *title)
 
 TNamed (const TNamed &named)
 TNamed copy ctor.
 
 TNamed (const TString &name, const TString &title)
 
virtual ~TNamed ()
 TNamed destructor.
 
void Clear (Option_t *option="") override
 Set name and title to empty strings ("").
 
TObjectClone (const char *newname="") const override
 Make a clone of an object using the Streamer facility.
 
Int_t Compare (const TObject *obj) const override
 Compare two TNamed objects.
 
void Copy (TObject &named) const override
 Copy this to obj.
 
const char * GetName () const override
 Returns name of object.
 
const char * GetTitle () const override
 Returns title of object.
 
ULong_t Hash () const override
 Return hash value for this object.
 
TClassIsA () const override
 
Bool_t IsSortable () const override
 
void ls (Option_t *option="") const override
 List TNamed name and title.
 
TNamedoperator= (const TNamed &rhs)
 TNamed assignment operator.
 
void Print (Option_t *option="") const override
 Print TNamed name and title.
 
virtual void SetNameTitle (const char *name, const char *title)
 Set all the TNamed parameters (name and title).
 
virtual void SetTitle (const char *title="")
 Set the title of the TNamed.
 
void Streamer (TBuffer &) override
 Stream an object of class TObject.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
- Public Member Functions inherited from TObject
 TObject ()
 TObject constructor.
 
 TObject (const TObject &object)
 TObject copy ctor.
 
virtual ~TObject ()
 TObject destructor.
 
void AbstractMethod (const char *method) const
 Use this method to implement an "abstract" method that you don't want to leave purely abstract.
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad.
 
ULong_t CheckedHash ()
 Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object.
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs.
 
virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
 Computes distance from point (px,py) to the object.
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs.
 
virtual TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current selected pad with: gROOT->SetSelectedPad(c1).
 
virtual void Dump () const
 Dump contents of object on stdout.
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message.
 
virtual void Execute (const char *method, const char *params, Int_t *error=nullptr)
 Execute method on this object with the given parameter string, e.g.
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=nullptr)
 Execute method on this object with parameters stored in the TObjArray.
 
virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
 Execute action corresponding to an event at (px,py).
 
virtual void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message.
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object.
 
virtual const char * GetIconName () const
 Returns mime type name of object.
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py).
 
virtual UInt_t GetUniqueID () const
 Return the unique object id.
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out.
 
Bool_t HasInconsistentHash () const
 Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e.
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message.
 
virtual Bool_t InheritsFrom (const char *classname) const
 Returns kTRUE if object inherits from class "classname".
 
virtual Bool_t InheritsFrom (const TClass *cl) const
 Returns kTRUE if object inherits from TClass cl.
 
virtual void Inspect () const
 Dump contents of this object in a graphics canvas.
 
void InvertBit (UInt_t f)
 
Bool_t IsDestructed () const
 IsDestructed.
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory).
 
R__ALWAYS_INLINE Bool_t IsOnHeap () const
 
R__ALWAYS_INLINE Bool_t IsZombie () const
 
void MayNotUse (const char *method) const
 Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary).
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification (the base implementation is no-op).
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete.
 
void operator delete (void *ptr)
 Operator delete.
 
void operator delete[] (void *ptr)
 Operator delete [].
 
void * operator new (size_t sz)
 
void * operator new (size_t sz, void *vp)
 
void * operator new[] (size_t sz)
 
void * operator new[] (size_t sz, void *vp)
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator.
 
virtual void Pop ()
 Pop on object drawn in a pad to the top of the display list.
 
virtual Int_t Read (const char *name)
 Read contents of object with specified name from the current directory.
 
void ResetBit (UInt_t f)
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename.
 
virtual void SavePrimitive (std::ostream &out, Option_t *option="")
 Save a primitive as a C++ statement(s) on output stream "out".
 
void SetBit (UInt_t f)
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f.
 
virtual void SetDrawOption (Option_t *option="")
 Set drawing option for object.
 
virtual void SetUniqueID (UInt_t uid)
 Set the unique object id.
 
void StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)
 
virtual void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message.
 
R__ALWAYS_INLINE Bool_t TestBit (UInt_t f) const
 
Int_t TestBits (UInt_t f) const
 
virtual void UseCurrentStyle ()
 Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked.
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message.
 

Static Public Member Functions

static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static const char * DeclFileName ()
 
- Static Public Member Functions inherited from TFile
static TFileOpenHandleAsyncOpen (const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
 Submit an asynchronous open request.
 
static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static Bool_t Cp (const char *src, const char *dst, Bool_t progressbar=kTRUE, UInt_t buffersize=1000000)
 Allows to copy file from src to dst URL.
 
static TFile *& CurrentFile ()
 Return the current ROOT file if any.
 
static const char * DeclFileName ()
 
static EAsyncOpenStatus GetAsyncOpenStatus (const char *name)
 Get status of the async open request related to 'name'.
 
static EAsyncOpenStatus GetAsyncOpenStatus (TFileOpenHandle *handle)
 Get status of the async open request related to 'handle'.
 
static const char * GetCacheFileDir ()
 Get the directory where to locally stage/cache remote files.
 
static const TUrlGetEndpointUrl (const char *name)
 Get final URL for file being opened asynchronously.
 
static Long64_t GetFileBytesRead ()
 Static function returning the total number of bytes read from all files.
 
static Long64_t GetFileBytesWritten ()
 Static function returning the total number of bytes written to all files.
 
static Long64_t GetFileCounter ()
 
static Int_t GetFileReadCalls ()
 Static function returning the total number of read calls from all files.
 
static Bool_t GetOnlyStaged ()
 Returns staged only flag.
 
static UInt_t GetOpenTimeout ()
 Returns open timeout (in ms).
 
static Int_t GetReadaheadSize ()
 Static function returning the readahead buffer size.
 
static Bool_t GetReadStreamerInfo ()
 If the streamerinfos are to be read at file opening.
 
static EFileType GetType (const char *name, Option_t *option="", TString *prefix=nullptr)
 Resolve the file type as a function of the protocol field in 'name'.
 
static void IncrementFileCounter ()
 
static TFileOpen (const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
 Create / open a file.
 
static TFileOpen (TFileOpenHandle *handle)
 Waits for the completion of an asynchronous open request.
 
static Bool_t SetCacheFileDir (std::string_view cacheDir, Bool_t operateDisconnected=kTRUE, Bool_t forceCacheread=kFALSE)
 Sets the directory where to locally stage/cache remote files.
 
static void SetFileBytesRead (Long64_t bytes=0)
 
static void SetFileBytesWritten (Long64_t bytes=0)
 
static void SetFileReadCalls (Int_t readcalls=0)
 
static Bool_t SetOnlyStaged (Bool_t onlystaged)
 Sets only staged flag.
 
static UInt_t SetOpenTimeout (UInt_t timeout)
 Sets open timeout time (in ms). Returns previous timeout value.
 
static void SetReadaheadSize (Int_t bufsize=256000)
 
static void SetReadStreamerInfo (Bool_t readinfo=kTRUE)
 Specify if the streamerinfos must be read at file opening.
 
static Bool_t ShrinkCacheFileDir (Long64_t shrinkSize, Long_t cleanupInteval=0)
 Try to shrink the cache to the desired size.
 
- Static Public Member Functions inherited from TDirectoryFile
static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static const char * DeclFileName ()
 
- Static Public Member Functions inherited from TDirectory
static void AddDirectory (Bool_t add=kTRUE)
 Sets the flag controlling the automatic add objects like histograms, TGraph2D, etc in memory.
 
static Bool_t AddDirectoryStatus ()
 Static function: see TDirectory::AddDirectory for more comments.
 
static Bool_t Cd (const char *path)
 Change current directory to "path".
 
static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static std::atomic< TDirectory * > & CurrentDirectory ()
 Return the current directory for the current thread.
 
static const char * DeclFileName ()
 
static void DecodeNameCycle (const char *namecycle, char *name, Short_t &cycle, const size_t namesize=0)
 Decode a namecycle "aap;2" into name "aap" and cycle "2".
 
- Static Public Member Functions inherited from TNamed
static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static const char * DeclFileName ()
 
- Static Public Member Functions inherited from TObject
static TClassClass ()
 
static const char * Class_Name ()
 
static constexpr Version_t Class_Version ()
 
static const char * DeclFileName ()
 
static Longptr_t GetDtorOnly ()
 Return destructor only flag.
 
static Bool_t GetObjectStat ()
 Get status of object stat flag.
 
static void SetDtorOnly (void *obj)
 Set destructor only flag.
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable.
 

Protected Types

enum class  EMode { kCreate , kRecreate , kUpdate , kRead }
 
- Protected Types inherited from TDirectory
using SharedGDirectory_t = std::shared_ptr< std::atomic< TDirectory * > >
 Pointer to a list of TContext object pointing to this TDirectory.
 
- Protected Types inherited from TObject
enum  { kOnlyPrepStep = (1ULL << ( 3 )) }
 

Protected Member Functions

Bool_t IsExternalData () const
 
Long64_t MemRead (Int_t fd, void *buf, Long64_t len) const
 
bool NeedsExistingFile (EMode mode) const
 
bool NeedsToWrite (EMode mode) const
 
TMemFileoperator= (const TMemFile &)=delete
 
EMode ParseOption (Option_t *option)
 Parse option strings and set fOption.
 
void ResetObjects (TDirectoryFile *, TFileMergeInfo *) const
 Wipe all the data from the permanent buffer but keep, the in-memory object alive.
 
Int_t SysClose (Int_t fd) override
 Close the mem file.
 
Int_t SysOpen (const char *pathname, Int_t flags, UInt_t mode) override
 Open a file in 'MemFile'.
 
Int_t SysRead (Int_t fd, void *buf, Int_t len) override
 Read specified number of bytes from current offset into the buffer.
 
Int_t SysReadImpl (Int_t fd, void *buf, Long64_t len)
 Read specified number of bytes from current offset into the buffer.
 
Long64_t SysSeek (Int_t fd, Long64_t offset, Int_t whence) override
 Seek to a specified position in the file.
 
Int_t SysStat (Int_t fd, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime) override
 Perform a stat on the file; see TFile::SysStat().
 
Int_t SysSync (Int_t fd) override
 Sync remaining data to disk.
 
Int_t SysWrite (Int_t fd, const void *buf, Int_t len) override
 Write a buffer into the file.
 
Int_t SysWriteImpl (Int_t fd, const void *buf, Long64_t len)
 Write a buffer into the file.
 
- Protected Member Functions inherited from TFile
virtual Long64_t DirCreateEntry (TDirectory *)
 
virtual Int_t DirReadKeys (TDirectory *)
 
virtual void DirWriteHeader (TDirectory *)
 
virtual void DirWriteKeys (TDirectory *)
 
Bool_t FlushWriteCache ()
 Flush the write cache if active.
 
virtual EAsyncOpenStatus GetAsyncOpenStatus ()
 
virtual InfoListRet GetStreamerInfoListImpl (bool lookupSICache)
 See documentation of GetStreamerInfoList for more details.
 
virtual void Init (Bool_t create)
 Initialize a TFile object.
 
Int_t MakeProjectParMake (const char *packname, const char *filename)
 Create makefile at 'filemake' for PAR package 'pack'.
 
Int_t MakeProjectParProofInf (const char *packname, const char *proofinfdir)
 Create BUILD.sh and SETUP.C under 'proofinf' for PAR package 'pack'.
 
Int_t ReadBufferViaCache (char *buf, Int_t len)
 Read buffer via cache.
 
Int_t WriteBufferViaCache (const char *buf, Int_t len)
 Write buffer via cache.
 
- Protected Member Functions inherited from TDirectoryFile
void BuildDirectoryFile (TFile *motherFile, TDirectory *motherDir)
 Initialise directory to defaults.
 
void CleanTargets ()
 Clean the pointers to this object (gDirectory, TContext, etc.)
 
void InitDirectoryFile (TClass *cl=nullptr)
 Initialize the key associated with this directory (and the related data members.
 
- Protected Member Functions inherited from TDirectory
 TDirectory (const TDirectory &directory)=delete
 
void BuildDirectory (TFile *motherFile, TDirectory *motherDir)
 Initialise directory to defaults.
 
Bool_t cd1 (const char *path)
 flag to add histograms, graphs,etc to the directory
 
void CleanTargets ()
 Clean the pointers to this object (gDirectory, TContext, etc.).
 
void FillFullPath (TString &buf) const
 Recursive method to fill full path for directory.
 
void operator= (const TDirectory &)=delete
 
void RegisterContext (TContext *ctxt)
 Register a TContext pointing to this TDirectory object.
 
void RegisterGDirectory (SharedGDirectory_t &ptr)
 Register a std::atomic<TDirectory*> that will soon be pointing to this TDirectory object.
 
void UnregisterContext (TContext *ctxt)
 UnRegister a TContext pointing to this TDirectory object.
 
- Protected Member Functions inherited from TObject
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected).
 
void MakeZombie ()
 

Protected Attributes

TMemBlock fBlockList
 Collection of memory blocks of size fgDefaultBlockSize.
 
Long64_t fBlockOffset {0}
 Seek offset within the block.
 
TMemBlockfBlockSeek {nullptr}
 Pointer to the block we seeked to.
 
Long64_t fDefaultBlockSize = fgDefaultBlockSize
 
ExternalDataPtr_t fExternalData
 shared file data / content
 
Bool_t fIsOwnedByROOT {kFALSE}
 if this is a C-style memory region
 
Long64_t fSize {0}
 Total file size (sum of the size of the chunks)
 
Long64_t fSysOffset {0}
 Seek offset in file.
 
- Protected Attributes inherited from TFile
TArchiveFilefArchive {nullptr}
 !Archive file from which we read this file
 
Long64_t fArchiveOffset {0}
 !Offset at which file starts in archive
 
TFileOpenHandlefAsyncHandle {nullptr}
 !For proper automatic cleanup
 
EAsyncOpenStatus fAsyncOpenStatus {kAOSNotAsync}
 !Status of an asynchronous open request
 
Long64_t fBEGIN {0}
 First used byte in file.
 
Long64_t fBytesRead {0}
 Number of bytes read from this file.
 
Long64_t fBytesReadExtra {0}
 Number of extra bytes (overhead) read by the readahead buffer.
 
Long64_t fBytesWrite {0}
 Number of bytes written to this file.
 
TFileCacheReadfCacheRead {nullptr}
 !Pointer to the read cache (if any)
 
TMapfCacheReadMap {nullptr}
 !Pointer to the read cache (if any)
 
TFileCacheWritefCacheWrite {nullptr}
 !Pointer to the write cache (if any)
 
TArrayCfClassIndex {nullptr}
 !Index of TStreamerInfo classes written to this file
 
Int_t fCompress {0}
 Compression level and algorithm.
 
Int_t fD {-1}
 File descriptor.
 
Long64_t fEND {0}
 Last used byte in file.
 
TListfFree {nullptr}
 Free segments linked list table.
 
bool fGlobalRegistration = true
 ! if true, bypass use of global lists
 
TListfInfoCache {nullptr}
 !Cached list of the streamer infos in this file
 
Bool_t fInitDone {kFALSE}
 !True if the file has been initialized
 
Bool_t fIsArchive {kFALSE}
 !True if this is a pure archive file
 
Bool_t fIsPcmFile {kFALSE}
 !True if the file is a ROOT pcm file.
 
Bool_t fIsRootFile {kTRUE}
 !True is this is a ROOT file, raw file otherwise
 
Bool_t fMustFlush {kTRUE}
 !True if the file buffers must be flushed
 
Int_t fNbytesFree {0}
 Number of bytes for free segments structure.
 
Int_t fNbytesInfo {0}
 Number of bytes for StreamerInfo record.
 
Bool_t fNoAnchorInName {kFALSE}
 !True if we don't want to force the anchor to be appended to the file name
 
Int_t fNProcessIDs {0}
 Number of TProcessID written to this file.
 
Long64_t fOffset {0}
 !Seek offset cache
 
TListfOpenPhases {nullptr}
 !Time info about open phases
 
TString fOption
 File options.
 
TObjArrayfProcessIDs {nullptr}
 !Array of pointers to TProcessIDs
 
Int_t fReadCalls {0}
 Number of read calls ( not counting the cache calls )
 
TString fRealName
 Effective real file name (not original url)
 
Long64_t fSeekFree {0}
 Location on disk of free segments structure.
 
Long64_t fSeekInfo {0}
 Location on disk of StreamerInfo record.
 
Double_t fSum2Buffer {0}
 Sum of squares of buffer sizes of objects written so far.
 
Double_t fSumBuffer {0}
 Sum of buffer sizes of objects written so far.
 
Char_t fUnits {0}
 Number of bytes for file pointers.
 
TUrl fUrl
 !URL of file
 
Int_t fVersion {0}
 File format version.
 
std::mutex fWriteMutex
 !Lock for writing baskets / keys into the file.
 
Int_t fWritten {0}
 Number of objects written so far.
 
- Protected Attributes inherited from TDirectoryFile
Int_t fBufferSize {0}
 Default buffer size to create new TKeys.
 
TDatime fDatimeC
 Date and time when directory is created.
 
TDatime fDatimeM
 Date and time of last modification.
 
TFilefFile {nullptr}
 Pointer to current file in memory.
 
TListfKeys {nullptr}
 Pointer to keys list in memory.
 
Bool_t fModified {kFALSE}
 True if directory has been modified.
 
Int_t fNbytesKeys {0}
 Number of bytes for the keys.
 
Int_t fNbytesName {0}
 Number of bytes in TNamed at creation time.
 
Long64_t fSeekDir {0}
 Location of directory on file.
 
Long64_t fSeekKeys {0}
 Location of Keys record on file.
 
Long64_t fSeekParent {0}
 Location of parent directory on file.
 
Bool_t fWritable {kFALSE}
 True if directory is writable.
 
- Protected Attributes inherited from TDirectory
TContextfContext {nullptr}
 Buffer for GetPath() function.
 
std::atomic< size_t > fContextPeg {0}
 thread local gDirectory pointing to this object.
 
std::vector< SharedGDirectory_tfGDirectories
 
TListfList {nullptr}
 
TObjectfMother {nullptr}
 
TString fPathBuffer
 
std::atomic_flag fSpinLock
 Counter delaying the TDirectory destructor from finishing.
 
TUUID fUUID
 
- Protected Attributes inherited from TNamed
TString fName
 
TString fTitle
 

Static Protected Attributes

static constexpr Long64_t fgDefaultBlockSize = 2 * 1024 * 1024
 
- Static Protected Attributes inherited from TFile
static TListfgAsyncOpenRequests = nullptr
 
static std::atomic< Long64_tfgBytesRead {0}
 Number of bytes read by all TFile objects.
 
static std::atomic< Long64_tfgBytesWrite {0}
 Number of bytes written by all TFile objects.
 
static TString fgCacheFileDir
 Directory where to locally stage files.
 
static Bool_t fgCacheFileDisconnected = kTRUE
 Indicates, we trust in the files in the cache dir without stat on the cached file.
 
static Bool_t fgCacheFileForce = kFALSE
 Indicates, to force all READ to CACHEREAD.
 
static std::atomic< Long64_tfgFileCounter {0}
 Counter for all opened files.
 
static Bool_t fgOnlyStaged = kFALSE
 Before the file is opened, it is checked, that the file is staged, if not, the open fails.
 
static UInt_t fgOpenTimeout = TFile::kEternalTimeout
 Timeout for open operations in ms - 0 corresponds to blocking i/o.
 
static Int_t fgReadaheadSize = 256000
 Readahead buffer size.
 
static std::atomic< Int_tfgReadCalls {0}
 Number of bytes read from all TFile objects.
 
static Bool_t fgReadInfo = kTRUE
 if true (default) ReadStreamerInfo is called when opening a file
 
static ROOT::Internal::RConcurrentHashColl fgTsSIHashes
 !TS Set of hashes built from read streamer infos
 
- Static Protected Attributes inherited from TDirectory
static Bool_t fgAddDirectory = kTRUE
 MSVC doesn't support = ATOMIC_FLAG_INIT;.
 

Additional Inherited Members

- Static Protected Member Functions inherited from TDirectory
static Bool_t Cd1 (const char *path)
 Change current directory to "path".
 
static SharedGDirectory_tGetSharedLocalCurrentDirectory ()
 Return the (address of) a shared pointer to the struct holding the actual thread local gDirectory pointer and the atomic_flag for its lock.
 

#include <TMemFile.h>

Inheritance diagram for TMemFile:
[legend]

Member Typedef Documentation

◆ ExternalDataPtr_t

using TMemFile::ExternalDataPtr_t = std::shared_ptr<const std::vector<char> >

Definition at line 21 of file TMemFile.h.

Member Enumeration Documentation

◆ EMode

enum class TMemFile::EMode
strongprotected
Enumerator
kCreate 
kRecreate 
kUpdate 
kRead 

Definition at line 75 of file TMemFile.h.

Constructor & Destructor Documentation

◆ TMemFile() [1/6]

TMemFile::TMemFile ( const char *  path,
Option_t option = "",
const char *  ftitle = "",
Int_t  compress = ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault,
Long64_t  defBlockSize = 0LL 
)

Usual Constructor.

The defBlockSize parameter defines the size of the blocks of memory allocated when expanding the underlying TMemFileBuffer. If the value 0 is passed, the default block size, fgDefaultBlockSize, is adopted. See the TFile constructor for details.

Definition at line 162 of file TMemFile.cxx.

◆ TMemFile() [2/6]

TMemFile::TMemFile ( const char *  name,
char *  buffer,
Long64_t  size,
Option_t option = "",
const char *  ftitle = "",
Int_t  compress = ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault,
Long64_t  defBlockSize = 0LL 
)

Usual Constructor. See the TFile constructor for details. Copy data from buffer.

Definition at line 170 of file TMemFile.cxx.

◆ TMemFile() [3/6]

TMemFile::TMemFile ( const char *  name,
ExternalDataPtr_t  data 
)

Constructor to create a TMemFile re-using external storage.

Definition at line 133 of file TMemFile.cxx.

◆ TMemFile() [4/6]

TMemFile::TMemFile ( const char *  name,
const ZeroCopyView_t datarange 
)

Constructor to create a TMemFile re-using external C-Style storage.

Definition at line 111 of file TMemFile.cxx.

◆ TMemFile() [5/6]

TMemFile::TMemFile ( const char *  name,
std::unique_ptr< TBufferFile buffer 
)

Constructor to create a read-only TMemFile using an std::unique_ptr<TBufferFile>

Definition at line 142 of file TMemFile.cxx.

◆ TMemFile() [6/6]

TMemFile::TMemFile ( const TMemFile orig)

Copying the content of the TMemFile into another TMemFile.

Definition at line 214 of file TMemFile.cxx.

◆ ~TMemFile()

TMemFile::~TMemFile ( )
override

Close and clean-up file.

Definition at line 236 of file TMemFile.cxx.

Member Function Documentation

◆ Class()

static TClass * TMemFile::Class ( )
static
Returns
TClass describing this class

◆ Class_Name()

static const char * TMemFile::Class_Name ( )
static
Returns
Name of this class

◆ Class_Version()

static constexpr Version_t TMemFile::Class_Version ( )
inlinestaticconstexpr
Returns
Version of this class

Definition at line 109 of file TMemFile.h.

◆ CopyTo() [1/2]

void TMemFile::CopyTo ( TBuffer tobuf) const
virtual

Copy the binary representation of the TMemFile into the TBuffer tobuf.

Definition at line 278 of file TMemFile.cxx.

◆ CopyTo() [2/2]

Long64_t TMemFile::CopyTo ( void *  to,
Long64_t  maxsize 
) const
virtual

Copy the binary representation of the TMemFile into the memory area starting at 'to' and of length at most 'maxsize' returns the number of bytes actually copied.

Definition at line 255 of file TMemFile.cxx.

◆ DeclFileName()

static const char * TMemFile::DeclFileName ( )
inlinestatic
Returns
Name of the file containing the class declaration

Definition at line 109 of file TMemFile.h.

◆ GetSize()

Long64_t TMemFile::GetSize ( ) const
overridevirtual

Return the current size of the memory file.

Reimplemented from TFile.

Definition at line 290 of file TMemFile.cxx.

◆ IsA()

TClass * TMemFile::IsA ( ) const
inlineoverridevirtual
Returns
TClass describing current object

Reimplemented from TFile.

Reimplemented in TParallelMergingFile.

Definition at line 109 of file TMemFile.h.

◆ IsExternalData()

Bool_t TMemFile::IsExternalData ( ) const
inlineprotected

Definition at line 58 of file TMemFile.h.

◆ MemRead()

Long64_t TMemFile::MemRead ( Int_t  fd,
void *  buf,
Long64_t  len 
) const
protected

◆ NeedsExistingFile()

bool TMemFile::NeedsExistingFile ( EMode  mode) const
inlineprotected

Definition at line 83 of file TMemFile.h.

◆ NeedsToWrite()

bool TMemFile::NeedsToWrite ( EMode  mode) const
inlineprotected

Definition at line 82 of file TMemFile.h.

◆ operator=()

TMemFile & TMemFile::operator= ( const TMemFile )
protecteddelete

◆ ParseOption()

TMemFile::EMode TMemFile::ParseOption ( Option_t option)
protected

Parse option strings and set fOption.

Definition at line 88 of file TMemFile.cxx.

◆ Print()

void TMemFile::Print ( Option_t option = "") const
overridevirtual

Print all objects in the file.

Reimplemented from TFile.

Definition at line 298 of file TMemFile.cxx.

◆ ResetAfterMerge()

void TMemFile::ResetAfterMerge ( TFileMergeInfo info)
overridevirtual

Wipe all the data from the permanent buffer but keep, the in-memory object alive.

Reimplemented from TDirectoryFile.

Definition at line 320 of file TMemFile.cxx.

◆ ResetErrno()

void TMemFile::ResetErrno ( ) const
overridevirtual

Simply calls TSystem::ResetErrno().

Reimplemented from TFile.

Definition at line 688 of file TMemFile.cxx.

◆ ResetObjects()

void TMemFile::ResetObjects ( TDirectoryFile directory,
TFileMergeInfo info 
) const
protected

Wipe all the data from the permanent buffer but keep, the in-memory object alive.

Definition at line 387 of file TMemFile.cxx.

◆ Streamer()

void TMemFile::Streamer ( TBuffer b)
overridevirtual

Stream a TFile object.

Reimplemented from TFile.

Reimplemented in TParallelMergingFile.

◆ StreamerNVirtual()

void TMemFile::StreamerNVirtual ( TBuffer ClassDef_StreamerNVirtual_b)
inline

Definition at line 109 of file TMemFile.h.

◆ SysClose()

Int_t TMemFile::SysClose ( Int_t  fd)
overrideprotectedvirtual

Close the mem file.

Reimplemented from TFile.

Definition at line 590 of file TMemFile.cxx.

◆ SysOpen()

Int_t TMemFile::SysOpen ( const char *  pathname,
Int_t  flags,
UInt_t  mode 
)
overrideprotectedvirtual

Open a file in 'MemFile'.

Reimplemented from TFile.

Definition at line 573 of file TMemFile.cxx.

◆ SysRead()

Int_t TMemFile::SysRead ( Int_t  fd,
void *  buf,
Int_t  len 
)
overrideprotectedvirtual

Read specified number of bytes from current offset into the buffer.

See documentation for TFile::SysRead().

Reimplemented from TFile.

Definition at line 488 of file TMemFile.cxx.

◆ SysReadImpl()

Int_t TMemFile::SysReadImpl ( Int_t  fd,
void *  buf,
Long64_t  len 
)
protected

Read specified number of bytes from current offset into the buffer.

See documentation for TFile::SysRead().

Definition at line 430 of file TMemFile.cxx.

◆ SysSeek()

Long64_t TMemFile::SysSeek ( Int_t  fd,
Long64_t  offset,
Int_t  whence 
)
overrideprotectedvirtual

Seek to a specified position in the file.

See TFile::SysSeek(). Note that TMemFile does not support seeks when the file is open for write.

Reimplemented from TFile.

Definition at line 497 of file TMemFile.cxx.

◆ SysStat()

Int_t TMemFile::SysStat ( Int_t  fd,
Long_t id,
Long64_t size,
Long_t flags,
Long_t modtime 
)
overrideprotectedvirtual

Perform a stat on the file; see TFile::SysStat().

Reimplemented from TFile.

Definition at line 670 of file TMemFile.cxx.

◆ SysSync()

Int_t TMemFile::SysSync ( Int_t  fd)
overrideprotectedvirtual

Sync remaining data to disk.

Nothing to do here.

Reimplemented from TFile.

Definition at line 680 of file TMemFile.cxx.

◆ SysWrite()

Int_t TMemFile::SysWrite ( Int_t  fd,
const void *  buf,
Int_t  len 
)
overrideprotectedvirtual

Write a buffer into the file.

Reimplemented from TFile.

Definition at line 662 of file TMemFile.cxx.

◆ SysWriteImpl()

Int_t TMemFile::SysWriteImpl ( Int_t  fd,
const void *  buf,
Long64_t  len 
)
protected

Write a buffer into the file.

Definition at line 598 of file TMemFile.cxx.

Member Data Documentation

◆ fBlockList

TMemBlock TMemFile::fBlockList
protected

Collection of memory blocks of size fgDefaultBlockSize.

Definition at line 47 of file TMemFile.h.

◆ fBlockOffset

Long64_t TMemFile::fBlockOffset {0}
protected

Seek offset within the block.

Definition at line 53 of file TMemFile.h.

◆ fBlockSeek

TMemBlock* TMemFile::fBlockSeek {nullptr}
protected

Pointer to the block we seeked to.

Definition at line 52 of file TMemFile.h.

◆ fDefaultBlockSize

Long64_t TMemFile::fDefaultBlockSize = fgDefaultBlockSize
protected

Definition at line 56 of file TMemFile.h.

◆ fExternalData

ExternalDataPtr_t TMemFile::fExternalData
protected

shared file data / content

Definition at line 48 of file TMemFile.h.

◆ fgDefaultBlockSize

constexpr Long64_t TMemFile::fgDefaultBlockSize = 2 * 1024 * 1024
staticconstexprprotected

Definition at line 55 of file TMemFile.h.

◆ fIsOwnedByROOT

Bool_t TMemFile::fIsOwnedByROOT {kFALSE}
protected

if this is a C-style memory region

Definition at line 49 of file TMemFile.h.

◆ fSize

Long64_t TMemFile::fSize {0}
protected

Total file size (sum of the size of the chunks)

Definition at line 50 of file TMemFile.h.

◆ fSysOffset

Long64_t TMemFile::fSysOffset {0}
protected

Seek offset in file.

Definition at line 51 of file TMemFile.h.

Libraries for TMemFile:

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