OpenDDS::DCPS::AllocHeader Class Reference

#include <MemoryPool.h>

Inheritance diagram for OpenDDS::DCPS::AllocHeader:

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List of all members.

Public Member Functions
	AllocHeader ()
unsigned int	size () const
unsigned int	prev_size () const
bool	is_free () const
unsigned char *	ptr () const
AllocHeader *	next_adjacent ()
AllocHeader *	prev_adjacent ()
void	allocate (size_t size)
void	set_size (size_t size)
void	set_prev_size (int size)
void	set_allocated ()
void	join_next ()
Protected Attributes
int	alloc_size_
	Size of my buffer, negative if free, positive if alloc.
int	prev_size_
	Size of previous buffer, or 0 if first, never negative.

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Detailed Description

Header of all allocations - found at beginning of allocation inside pool. Extra room must be added to each allocation for this header.

Definition at line 23 of file MemoryPool.h.

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Constructor & Destructor Documentation

OpenDDS::DCPS::AllocHeader::AllocHeader

(

)

Construct

Definition at line 35 of file MemoryPool.cpp.

: alloc_size_(0)
, prev_size_(0)
{
}

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Member Function Documentation

void OpenDDS::DCPS::AllocHeader::allocate

(

size_t

size

)

Allocate from this block: change size, and mark as allocated

Definition at line 67 of file MemoryPool.cpp.

References set_allocated(), and set_size().

                                 {
  set_allocated();
  set_size(size);
}

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bool OpenDDS::DCPS::AllocHeader::is_free

(

)

const [inline]

Is this alloc free

Definition at line 33 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::MemoryPool::joinable_next(), OpenDDS::DCPS::MemoryPool::joinable_prev(), OpenDDS::DCPS::FreeHeader::set_free(), and set_size().

{ return alloc_size_ < 0; }

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void OpenDDS::DCPS::AllocHeader::join_next

(

)

Join with the next adjacent block

Definition at line 82 of file MemoryPool.cpp.

References next_adjacent(), set_size(), and size().

Referenced by OpenDDS::DCPS::MemoryPool::join_free_allocs().

                       {
  // All unsigned, set_size will make negative if free (it is)
  size_t next_size = this->next_adjacent()->size();
  size_t joined_size = this->size() + next_size + sizeof(AllocHeader);
  this->set_size(joined_size);
}

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AllocHeader * OpenDDS::DCPS::AllocHeader::next_adjacent

(

)

Go to next header

Definition at line 49 of file MemoryPool.cpp.

References ptr(), and size().

Referenced by OpenDDS::DCPS::MemoryPool::allocate(), OpenDDS::DCPS::MemoryPool::join_free_allocs(), join_next(), and OpenDDS::DCPS::MemoryPool::joinable_next().

                           {
  unsigned char* past_buffer_end = ptr() + size();
  return reinterpret_cast<AllocHeader*>(past_buffer_end);
}

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AllocHeader * OpenDDS::DCPS::AllocHeader::prev_adjacent

(

)

Go to prev header

Definition at line 55 of file MemoryPool.cpp.

References prev_size_.

Referenced by OpenDDS::DCPS::MemoryPool::join_free_allocs(), and OpenDDS::DCPS::MemoryPool::joinable_prev().

                           {
  AllocHeader* result = NULL;
  if (prev_size_) {
    unsigned char* self = reinterpret_cast<unsigned char*>(this);
    unsigned char* prev_buffer_start = self - prev_size_;
    unsigned char* past_alloc = prev_buffer_start - sizeof(AllocHeader);
    result = reinterpret_cast<AllocHeader*>(past_alloc);
  }
  return result;
}

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unsigned int OpenDDS::DCPS::AllocHeader::prev_size

(

)

const [inline]

Get prev alloc size

Definition at line 31 of file MemoryPool.h.

{ return prev_size_; }

unsigned char * OpenDDS::DCPS::AllocHeader::ptr

(

void

)

const

Get pointer to start of my buffer

Definition at line 42 of file MemoryPool.cpp.

Referenced by OpenDDS::DCPS::MemoryPool::allocate(), and next_adjacent().

{
  const unsigned char* buff = reinterpret_cast<const unsigned char*>(this + 1);
  return const_cast<unsigned char*>(buff);
}

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void OpenDDS::DCPS::AllocHeader::set_allocated

(

)

[inline]

Mark this block as allocated

Definition at line 52 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::MemoryPool::allocate(), and allocate().

{ if (alloc_size_ < 0) alloc_size_ = - alloc_size_; }

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void OpenDDS::DCPS::AllocHeader::set_prev_size

(

int

size

)

[inline]

Set the prev size value stored in this header

Definition at line 50 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::MemoryPool::allocate(), and OpenDDS::DCPS::MemoryPool::join_free_allocs().

{ prev_size_ = size; }

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void OpenDDS::DCPS::AllocHeader::set_size

(

size_t

size

)

Set the size value stored in this header

Definition at line 73 of file MemoryPool.cpp.

References alloc_size_, and is_free().

Referenced by OpenDDS::DCPS::MemoryPool::allocate(), allocate(), and join_next().

{
  if (is_free()) {
    size *= -1;
  }
  alloc_size_ = (int)size;
}

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unsigned int OpenDDS::DCPS::AllocHeader::size

(

void

)

const [inline]

Get alloc size

Definition at line 29 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::FreeIndex::add(), OpenDDS::DCPS::MemoryPool::allocate(), OpenDDS::DCPS::FreeIndex::find(), OpenDDS::DCPS::MemoryPool::insert_free_alloc(), OpenDDS::DCPS::MemoryPool::join_free_allocs(), join_next(), OpenDDS::DCPS::MemoryPool::MemoryPool(), next_adjacent(), OpenDDS::DCPS::MemoryPool::pool_alloc(), and OpenDDS::DCPS::FreeIndex::remove().

{ return is_free() ? -alloc_size_ : alloc_size_; }

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Member Data Documentation

int OpenDDS::DCPS::AllocHeader::alloc_size_ [protected]

Size of my buffer, negative if free, positive if alloc.

Sizes are those of buffers, does not include size of headers

Definition at line 59 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::FreeHeader::init_free_block(), OpenDDS::DCPS::FreeHeader::set_free(), and set_size().

int OpenDDS::DCPS::AllocHeader::prev_size_ [protected]

Size of previous buffer, or 0 if first, never negative.

Definition at line 60 of file MemoryPool.h.

Referenced by OpenDDS::DCPS::FreeHeader::init_free_block(), and prev_adjacent().

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

• MemoryPool.h
• MemoryPool.cpp