G4AllocatorPool Class Reference

#include <G4AllocatorPool.hh>

Collaboration diagram for G4AllocatorPool:

Classes
class	G4PoolChunk
struct	G4PoolLink

Public Member Functions
	G4AllocatorPool (unsigned int n=0)
	~G4AllocatorPool ()
void *	Alloc ()
void	Free (void *b)
unsigned int	Size () const
void	Reset ()
int	GetNoPages () const
unsigned int	GetPageSize () const
void	GrowPageSize (unsigned int factor)

Private Member Functions
	G4AllocatorPool (const G4AllocatorPool &right)
G4AllocatorPool &	operator= (const G4AllocatorPool &right)
void	Grow ()

Private Attributes
const unsigned int	esize
unsigned int	csize
G4PoolChunk *	chunks
G4PoolLink *	head
int	nchunks

Detailed Description

Definition at line 50 of file G4AllocatorPool.hh.

Constructor & Destructor Documentation

G4AllocatorPool() [1/2]

G4AllocatorPool::G4AllocatorPool ( unsigned int  n = 0 )

explicit

Definition at line 44 of file G4AllocatorPool.cc.

  : esize(sz<sizeof(G4PoolLink) ? sizeof(G4PoolLink) : sz),
    csize(sz<1024/2-16 ? 1024-16 : sz*10-16),
    chunks(0), head(0), nchunks(0)
{
}

~G4AllocatorPool()

G4AllocatorPool::~G4AllocatorPool

(

)

Definition at line 79 of file G4AllocatorPool.cc.

{
  Reset();
}

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G4AllocatorPool() [2/2]

G4AllocatorPool::G4AllocatorPool ( const G4AllocatorPool &  right )

private

Definition at line 55 of file G4AllocatorPool.cc.

  : esize(right.esize), csize(right.csize),
    chunks(right.chunks), head(right.head), nchunks(right.nchunks)
{
}

Member Function Documentation

Alloc()

void * G4AllocatorPool::Alloc ( )

inline

Definition at line 119 of file G4AllocatorPool.hh.

{
  if (head==0) { Grow(); }
  G4PoolLink* p = head;  // return first element
  head = p->next;
  return p;
}

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Free()

void G4AllocatorPool::Free ( void *  b )

inline

Definition at line 132 of file G4AllocatorPool.hh.

{
  G4PoolLink* p = static_cast<G4PoolLink*>(b);
  p->next = head;        // put b back as first element
  head = p;
}

GetNoPages()

int G4AllocatorPool::GetNoPages ( ) const

inline

Definition at line 154 of file G4AllocatorPool.hh.

{
  return nchunks;
}

GetPageSize()

unsigned int G4AllocatorPool::GetPageSize ( ) const

inline

Definition at line 164 of file G4AllocatorPool.hh.

{
  return csize;
}

Grow()

void G4AllocatorPool::Grow ( )

private

Definition at line 109 of file G4AllocatorPool.cc.

{
  // Allocate new chunk, organize it as a linked list of
  // elements of size 'esize'
  //
  G4PoolChunk* n = new G4PoolChunk(csize);
  n->next = chunks;
  chunks = n;
  nchunks++;

  const int nelem = csize/esize;
  char* start = n->mem;
  char* last = &start[(nelem-1)*esize];
  for (char* p=start; p<last; p+=esize)
  {
    reinterpret_cast<G4PoolLink*>(p)->next
      = reinterpret_cast<G4PoolLink*>(p+esize);
  }
  reinterpret_cast<G4PoolLink*>(last)->next = 0;
  head = reinterpret_cast<G4PoolLink*>(start);
}

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GrowPageSize()

void G4AllocatorPool::GrowPageSize ( unsigned int  factor )

inline

Definition at line 174 of file G4AllocatorPool.hh.

{
  csize = (sz) ? sz*csize : csize; 
}

operator=()

G4AllocatorPool & G4AllocatorPool::operator= ( const G4AllocatorPool &  right )

private

Definition at line 66 of file G4AllocatorPool.cc.

{
  if (&right == this) { return *this; }
  chunks  = right.chunks;
  head    = right.head;
  nchunks = right.nchunks;
  return *this;
}

Reset()

void G4AllocatorPool::Reset

(

)

Definition at line 88 of file G4AllocatorPool.cc.

{
  // Free all chunks
  //
  G4PoolChunk* n = chunks;
  G4PoolChunk* p = 0;
  while (n)
  {
    p = n;
    n = n->next;
    delete p;
  }
  head = 0;
  chunks = 0;
  nchunks = 0;
}

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Size()

unsigned int G4AllocatorPool::Size ( ) const

inline

Definition at line 144 of file G4AllocatorPool.hh.

{
  return nchunks*csize;
}

Member Data Documentation

chunks

G4PoolChunk* G4AllocatorPool::chunks

private

Definition at line 105 of file G4AllocatorPool.hh.

csize

unsigned int G4AllocatorPool::csize

private

Definition at line 104 of file G4AllocatorPool.hh.

esize

const unsigned int G4AllocatorPool::esize

private

Definition at line 103 of file G4AllocatorPool.hh.

head

G4PoolLink* G4AllocatorPool::head

private

Definition at line 106 of file G4AllocatorPool.hh.

nchunks

int G4AllocatorPool::nchunks

private

Definition at line 107 of file G4AllocatorPool.hh.

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

• G4AllocatorPool.hh
• G4AllocatorPool.cc