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HeapStackTop Class Reference

personnal version of the HeapStackTop class by Nathan C.Myers described in the july and august 1993 articles of C++ report entitled MemoryManagement in C++ More...

#include <PsnNew.h>

List of all members.

Public Methods
	HeapStackTop (PsnMemoryManager *newTop)
	constructor install newTop as the new default memory allocator
virtual	~HeapStackTop ()
	destructor reinstall _oldMemoryManager as the default memory allocator
void *	operator new (size_t)
	redefine allocation for fast allocation - deallocation cycles
void	operator delete (void *, size_t)
Static Public Methods
pthread_key_t	initialiseGlobalMemoryManagerKey ()
	a function to enble correct initialisation of keys
pthread_key_t	initialiseFreedKey ()
	a function to enble correct initialisation of keys
PsnSystemMemoryManager *	getSystemMemoryManager ()
	a function to get to the system memory manager wich is wrapped by the PsnSharedMemoryManager class
Static Public Attributes
pthread_key_t	globalMemoryManagerKey = HeapStackTop::initialiseGlobalMemoryManagerKey ()
	A key for a thread to access it's current memory manager.
Protected Attributes
void *	_oldMemoryManager
	the old memoryManager replaced during creation of this HeapStackTop
Static Protected Attributes
pthread_key_t	freedKey = HeapStackTop::initialiseFreedKey ()
	A key for a thread to access it's last freed memory area for an object of HeapStackTop type.
Friends
class	PsController
	declare the controler as a friend so that freedKey can be properly destroyed

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Detailed Description

personnal version of the HeapStackTop class by Nathan C.Myers described in the july and august 1993 articles of C++ report entitled MemoryManagement in C++

Definition at line 30 of file PsnNew.h.

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Constructor & Destructor Documentation

HeapStackTop::HeapStackTop (  PsnMemoryManager *    newTop )

constructor install newTop as the new default memory allocator Definition at line 98 of file PsnNew.cxx. References _oldMemoryManager, globalMemoryManagerKey, and initialiseGlobalMemoryManagerKey(). { static pthread_key_t bidon = HeapStackTop::initialiseGlobalMemoryManagerKey () ; #ifdef _DEBUGMEMORYMANAGEMENT cerr<<"HeapStackTop::HeapStackTop"<<endl; #endif _oldMemoryManager = pthread_getspecific( globalMemoryManagerKey ) ; pthread_setspecific ( globalMemoryManagerKey , newTop ); }

HeapStackTop::~HeapStackTop (    )  [virtual]

destructor reinstall _oldMemoryManager as the default memory allocator Definition at line 109 of file PsnNew.cxx. References _oldMemoryManager, globalMemoryManagerKey, and initialiseGlobalMemoryManagerKey(). { static pthread_key_t bidon = HeapStackTop::initialiseGlobalMemoryManagerKey () ; #ifdef _DEBUGMEMORYMANAGEMENT cerr<<"HeapStackTop::~HeapStackTop"<<endl; #endif pthread_setspecific ( globalMemoryManagerKey , _oldMemoryManager ); }

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Member Function Documentation

PsnSystemMemoryManager * HeapStackTop::getSystemMemoryManager (    )  [static]

a function to get to the system memory manager wich is wrapped by the PsnSharedMemoryManager class Definition at line 24 of file PsnNew.cxx. Referenced by PsnMultiThreadedScheduler::_threadContainer(), PsnMultiThreadedBenchmarkingScheduler::_threadContainer(), PsOutput< Type >::getDateOfLastExactValue(), PsOutput< Type >::getLastExactValue(), initialiseGlobalMemoryManagerKey(), PsOutput< Type >::localGet(), PsOutput< Type >::localInsert(), PsnMemoryElementDescriptor::operator new(), PsMultiThreadedPvmController::run(), PsMultiThreadedController::run(), and PsnMemoryManager::whichMemoryManager(). { // using new causes an infinite loop, as new needs getSystmeMemoryManager // static PsnSystemMemoryManager toto ; return & toto ; }

pthread_key_t HeapStackTop::initialiseFreedKey (    )  [static]

a function to enble correct initialisation of keys Definition at line 52 of file PsnNew.cxx. References freedKey. Referenced by operator delete(), and operator new(). { static bool done = false ; if ( ! done ) { pthread_key_t res ; pthread_key_create(&res, NULL) ; pthread_setspecific ( res , NULL ); done = true ; freedKey =res ; return res ; } else { return freedKey ; } }

pthread_key_t HeapStackTop::initialiseGlobalMemoryManagerKey (    )  [static]

a function to enble correct initialisation of keys Definition at line 32 of file PsnNew.cxx. References getSystemMemoryManager(), and globalMemoryManagerKey. Referenced by HeapStackTop(), operator new(), and ~HeapStackTop(). { static bool done = false ; if ( ! done ) { pthread_key_t res ; pthread_key_create(&res, NULL) ; pthread_setspecific ( res , getSystemMemoryManager() ); done = true ; globalMemoryManagerKey = res ; return res ; } else { return globalMemoryManagerKey ; } }

void HeapStackTop::operator delete (  void *   , size_t    )

Definition at line 87 of file PsnNew.cxx. References freedKey, and initialiseFreedKey(). { static pthread_key_t bidon = initialiseFreedKey () ; void * freed = pthread_getspecific(freedKey) ; if (freed!=NULL) { ::operator delete (freed); } pthread_setspecific(freedKey, addr); }

void * HeapStackTop::operator new (  size_t    )

redefine allocation for fast allocation - deallocation cycles Definition at line 75 of file PsnNew.cxx. References freedKey, initialiseFreedKey(), and operator new(). { static pthread_key_t bidon = initialiseFreedKey () ; void * freed = pthread_getspecific(freedKey) ; if (freed!=NULL) { return freed; } else { return ::operator new(size); } }

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Friends And Related Function Documentation

friend class PsController [friend]

declare the controler as a friend so that freedKey can be properly destroyed Definition at line 60 of file PsnNew.h.

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Member Data Documentation

void* HeapStackTop::_oldMemoryManager [protected]

the old memoryManager replaced during creation of this HeapStackTop Definition at line 63 of file PsnNew.h. Referenced by HeapStackTop(), and ~HeapStackTop().

pthread_key_t HeapStackTop::freedKey = HeapStackTop::initialiseFreedKey () [static, protected]

A key for a thread to access it's last freed memory area for an object of HeapStackTop type. Definition at line 71 of file PsnNew.cxx. Referenced by initialiseFreedKey(), operator delete(), and operator new().

pthread_key_t HeapStackTop::globalMemoryManagerKey = HeapStackTop::initialiseGlobalMemoryManagerKey () [static]

A key for a thread to access it's current memory manager. Use should be implicit, through creation and deletion of heapStackTop objects Definition at line 70 of file PsnNew.cxx. Referenced by HeapStackTop(), initialiseGlobalMemoryManagerKey(), PsnRelaxedMemoryManager::mLatencyMalloc(), PsnRelaxedMemoryManager::mmallocForOnce(), operator delete(), PsnMemoryElementDescriptor::operator delete(), operator new(), PsnMomeArray< T >::PsnMomeArray(), ~HeapStackTop(), and PsnMemoryManager::~PsnMemoryManager().

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

• PsnNew.h
• PsnNew.cxx

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