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// File: Standard.cxx
// Created: Tue Mar 15 17:33:31 2005
// Author: Peter KURNEV
// <pkv@irinox>
#include <Standard.ixx>
#include <stdlib.h>
#include <Standard_MMgrOpt.hxx>
#include <Standard_MMgrRaw.hxx>
#include <Standard_MMgrTBBalloc.hxx>
#ifndef MMGT_OPT_DEFAULT
# define MMGT_OPT_DEFAULT 1
#endif
#ifndef MMGT_CLEAR_DEFAULT
# define MMGT_CLEAR_DEFAULT 1
#endif
#ifndef MMGT_MMAP_DEFAULT
# define MMGT_MMAP_DEFAULT 1
#endif
#ifndef MMGT_CELLSIZE_DEFAULT
# define MMGT_CELLSIZE_DEFAULT 200
#endif
#ifndef MMGT_NBPAGES_DEFAULT
# define MMGT_NBPAGES_DEFAULT 1000
#endif
#ifndef MMGT_THRESHOLD_DEFAULT
# define MMGT_THRESHOLD_DEFAULT 40000
#endif
#ifndef MMGT_REENTRANT_DEFAULT
# define MMGT_REENTRANT_DEFAULT 0
#endif
// Global reentrant flag
static Standard_Boolean Standard_IsReentrant = Standard_False;
//=======================================================================
//class : Standard_MMgrFactory
//purpose : Container for pointer to memory manager;
// used to construct appropriate memory manager according
// to environment settings, and to ensure destruction upon exit
//=======================================================================
class Standard_MMgrFactory {
public:
Standard_MMgrFactory();
~Standard_MMgrFactory();
public:
Standard_MMgrRoot* myFMMgr;
};
//=======================================================================
//function : Standard_MMgrFactory
//purpose : Check environment variables and create appropriate memory manager
//=======================================================================
Standard_MMgrFactory::Standard_MMgrFactory() : myFMMgr(0)
{
char *var;
Standard_Boolean bClear, bMMap, bReentrant;
Standard_Integer aCellSize, aNbPages, aThreshold, bOptAlloc;
//
bOptAlloc = ((var = getenv("MMGT_OPT" )) != NULL) ? atoi(var) : MMGT_OPT_DEFAULT;
bClear = ((var = getenv("MMGT_CLEAR" )) != NULL) ? atoi(var) : MMGT_CLEAR_DEFAULT;
bMMap = ((var = getenv("MMGT_MMAP" )) != NULL) ? atoi(var) : MMGT_MMAP_DEFAULT;
aCellSize = ((var = getenv("MMGT_CELLSIZE" )) != NULL) ? atoi(var) : MMGT_CELLSIZE_DEFAULT;
aNbPages = ((var = getenv("MMGT_NBPAGES" )) != NULL) ? atoi(var) : MMGT_NBPAGES_DEFAULT;
aThreshold = ((var = getenv("MMGT_THRESHOLD")) != NULL) ? atoi(var) : MMGT_THRESHOLD_DEFAULT;
bReentrant = ((var = getenv("MMGT_REENTRANT")) != NULL) ? atoi(var) : MMGT_REENTRANT_DEFAULT;
if ( bOptAlloc == 1 ) {
myFMMgr = new Standard_MMgrOpt(bClear, bMMap, aCellSize, aNbPages,
aThreshold, bReentrant);
}
else if ( bOptAlloc == 2 ) {
myFMMgr = new Standard_MMgrTBBalloc(bClear);
}
else {
myFMMgr = new Standard_MMgrRaw(bClear);
}
// Set grobal reentrant flag according to MMGT_REENTRANT environment variable
if ( ! Standard_IsReentrant )
Standard_IsReentrant = bReentrant;
}
//=======================================================================
//function : ~Standard_MMgrFactory
//purpose :
//=======================================================================
Standard_MMgrFactory::~Standard_MMgrFactory()
{
if ( ! myFMMgr ) {
myFMMgr->Purge(Standard_True);
// delete myFMMgr;
// myFMMgr = 0;
}
}
//=======================================================================
// function: GetMMgr
//
// This static function has a purpose to wrap static holder for memory
// manager instance.
//
// Wrapping holder inside a function is needed to ensure that it will
// be initialized not later than the first call to memory manager (that
// would be impossible to guarantee if holder was static variable on
// global or file scope, because memory manager may be called from
// constructors of other static objects).
//
// Note that at the same time we could not guarantee that the holder
// object is destroyed after last call to memory manager, since that
// last call may be from static Handle() object which has been initialized
// dynamically during program execution rather than in its constructor.
//
// Therefore holder currently does not call destructor of the memory manager
// but only its method Purge() with Standard_True.
//
// To free the memory completely, we probably could use compiler-specific
// pragmas (such as '#pragma fini' on SUN Solaris and '#pragma init_seg' on
// WNT MSVC++) to put destructing function in code segment that is called
// after destructors of other (even static) objects. However, this is not
// done by the moment since it is compiler-dependent and there is no guarantee
// thatsome other object calling memory manager is not placed also in that segment...
//
// Note that C runtime function atexit() could not help in this problem
// since its behaviour is the same as for destructors of static objects
// (see ISO 14882:1998 "Programming languages -- C++" 3.6.3)
//
// The correct approach to deal with the problem would be to have memory manager
// to properly control its memory allocation and caching free blocks so
// as to release all memory as soon as it is returned to it, and probably
// even delete itself if all memory it manages has been released and
// last call to method Purge() was with True.
//
// Note that one possible method to control memory allocations could
// be counting calls to Allocate() and Free()...
//
//=======================================================================
static Standard_MMgrRoot* GetMMgr()
{
static Standard_MMgrFactory aFactory;
return aFactory.myFMMgr;
}
//=======================================================================
//function : Allocate
//purpose :
//=======================================================================
Standard_Address Standard::Allocate(const Standard_Size size)
{
return GetMMgr()->Allocate(size);
}
//=======================================================================
//function : Free
//purpose :
//=======================================================================
void Standard::Free(Standard_Address& aStorage)
{
GetMMgr()->Free(aStorage);
}
//=======================================================================
//function : Reallocate
//purpose :
//=======================================================================
Standard_Address Standard::Reallocate(Standard_Address& aStorage,
const Standard_Size newSize)
{
return GetMMgr()->Reallocate(aStorage, newSize);
}
//=======================================================================
//function : Purge
//purpose :
//=======================================================================
Standard_Integer Standard::Purge()
{
return GetMMgr()->Purge();
}
//=======================================================================
//function : IsReentrant
//purpose :
//=======================================================================
Standard_Boolean Standard::IsReentrant()
{
return Standard_IsReentrant;
}
//=======================================================================
//function : SetReentrant
//purpose :
//=======================================================================
void Standard::SetReentrant (const Standard_Boolean isReentrant)
{
Standard_IsReentrant = isReentrant;
GetMMgr()->SetReentrant (isReentrant);
}
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