Log of /trunk/io/io/inc/TFree.h
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Revision
7810 -
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Modified
Tue Dec 30 13:16:51 2003 UTC (11 years ago) by
brun
Original Path:
trunk/io/inc/TFree.h
File length: 2167 byte(s)
Diff to
previous 6186
Mega patch to add support for large files (bigger than 2 GBytes)
----------------------------------------------------------------
==========>NEW VERSION 4.00/00 <===========
Because this new version has a considerable number of changes,
and new important additions by Philippe are scheduled for the coming days
we are starting a new major version 4.
-Support for large files
-Automatic schema evolution for foreign classes
-New data type Double32_t
Large files are currently tested only under Linux with gcc3.2.
Support for other systems will be gradually added in the coming days.
By default under Linux, files are created with the option LARGEFILE.
Note that when creating a Tree, the default maximum size for a Tree
is set to 1.9 GBytes. You can change this default value by calling
TTree::SetMaxTreeSize(Long64_t maxsize)
The implementation of this new feature has required changes in many places.
The files produced by this new version can still be read by old ROOT versions
if their size if smaller than 2 GBytes. And obviously, the new version
can digest old ROOT files.
WARNING: note the following backward incompatibility:
-TSystem::GetPathInfo has a new signature: (also TUnixSystem, TWinNTSystem, etc)
old: GetPathInfo(const char *path, Long_t *id, Long_t *size, Long_t *flags, Long_t *modtime);
new: GetPathInfo(const char *path, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime);
-TFile::SysSeek and TFile::SysStat have a new signature (also TNetFile, TWebFile, etc)
old: Int_t SysSeek(Int_t fd, Long_t offset, Int_t whence);
Int_t SysStat(Int_t fd, Long_t *id, Long_t *size, Long_t *flags, Long_t *modtime);
new: Long64_t SysSeek(Int_t fd, Long64_t offset, Int_t whence);
Int_t SysStat(Int_t fd, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime);
-TTree::SetMaxTreeSize has a new signature:
old: void TTree::SetMaxTreeSize(Int_t maxsize)
new: void TTree::SetMaxTreeSize(Long64_t maxsize)
All references to Seek_t have been replaced by Long64_t.
Revision
6186 -
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Modified
Wed Feb 26 10:11:51 2003 UTC (11 years, 10 months ago) by
brun
Original Path:
trunk/io/inc/TFree.h
File length: 2152 byte(s)
Diff to
previous 1205
Implement all the changes required to process files > 2 GBytes.
Activating this option will imply changing Seek_t to long long.
We hope that Masa will implement the longlong type by default
in the not too distant future in CINT.
The file format remains compatible for files smaller than the
threshold set in TFile::kStartBigFile = 2 GigaBytes.
The changes are the following:
in TFile
========
Remove the enum kBegin, kUnits (not used anymore).
Add new enum kStartBigFile
When creating a new file (in TFile::Init) fBEGIN is now set to 100
bytes instead of 64. TFile::WriteHeader is called assuming that
the file will be smaller than kStartBigFile.
When closing the file, if the file is bigger than kStartBigFile,
a new format is used in WriteHeader using 64 bits to store all
values of type Seek_t and the file version (fVersion) is set
to fVersion+1000000.
All functions like TFile::Map, TFile::Recover have been adapted
to follow the new convention.
in TDirectory
=============
TDirectory::Sizeof has been modified to return 12 bytes in addition
for fSeekDir, fSeekParent and fSeekKeys when writing a directory
in a file bigger than kStartBigFile.
The TDirectory constructor is setting a temporary bit to inform
the function Sizeof that it has to return 12 addtional bytes.
TDirectory::FillBuffer writes fSeekDir, fSeekParent and fSeekKeys
with 64 bits if necessary. The version number of the directory
is set to TDirectory class version + 1000 in this case.
Corresponding changes in TDirectory::ReadBuffer and TDirectory::Streamer.
in TFree
========
TFree::Sizeof has been moved to the implementation file.
Like for TDirectory, the functions FillBuffer and ReadBuffer have been
modified to write fFirst and fLast in 64 bits if necessary.
When writing in 64 bits mode, the TFree version is incremented by 1000.
in TKey and TBasket
===================
Same changesas in TDirectory in teh functions FillBuffer, ReadBuffer
and Streamer. The TKey version number is incremented by 1000
when writing in 64 bits mode.
Revision
1205 -
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Modified
Wed Dec 13 15:13:57 2000 UTC (14 years, 1 month ago) by
brun
Original Path:
trunk/io/inc/TFree.h
File length: 2198 byte(s)
Diff to
previous 911
W A R N I N G !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
==================================================================
A very long list of changes in this pre-release of version 3.00.
We have modified the signature of many functions (in particular TObject)
to introduce more constness in the system.
You must change your code if your class derives from TObject and uses
one of the modified functions such as ls, Print, Compare, Hash, etc.
The modified functions in TObject have the following signature:
virtual TObject *Clone() const;
virtual Int_t Compare(const TObject *obj) const;
virtual void Delete(Option_t *option=""); // *MENU*
virtual void DrawClass() const; // *MENU*
virtual void DrawClone(Option_t *option="") const; // *MENU*
virtual void Dump() const; // *MENU*
virtual TObject *FindObject(const TObject *obj) const;
virtual char *GetObjectInfo(Int_t px, Int_t py) const;
virtual ULong_t Hash() const;
virtual void Inspect() const; // *MENU*
virtual Bool_t IsEqual(const TObject *obj) const;
virtual void ls(Option_t *option="") const;
virtual void Print(Option_t *option="") const;
A similar operation has been done with classes such as TH1, TVirtualPad,
TTree, etc.
Revision
911 -
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Modified
Tue Nov 21 16:15:29 2000 UTC (14 years, 2 months ago) by
brun
Original Path:
trunk/io/inc/TFree.h
File length: 2189 byte(s)
Diff to
previous 3
Modify calling sequence for the following functions:
TFree(TList *lfree, Seek_t first, Seek_t last);
TFree *AddFree(TList *lfree, Seek_t first, Seek_t last);
TFree *GetBestFree(TList *lfree, Int_t nbytes);
Instead of using the global gFile, the list of free segments is passed
to the functions. This makes TFree independent of TFile.
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