OpenDDS::DCPS::FreeHeader Class Reference

#include <MemoryPool.h>

Inheritance diagram for OpenDDS::DCPS::FreeHeader:

[legend]Collaboration diagram for OpenDDS::DCPS::FreeHeader:

[legend]List of all members.

Public Member Functions
void	init_free_block (unsigned int pool_size)
void	set_free ()
FreeHeader *	smaller_free (unsigned char *pool_base) const
FreeHeader *	larger_free (unsigned char *pool_base) const
void	set_smaller_free (FreeHeader *next, unsigned char *pool_base)
void	set_larger_free (FreeHeader *prev, unsigned char *pool_base)
Private Attributes
size_t	offset_smaller_free_
	Offset to smaller free block in size order.
size_t	offset_larger_free_
	Offset to larger free block in size order.

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Detailed Description

Header of free allocations - found at beginning of allocation inside pool. This forces a minimum allocation size, so that, when freed, header can be cast to this type.

Definition at line 64 of file MemoryPool.h.

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Member Function Documentation

void OpenDDS::DCPS::FreeHeader::init_free_block

(

unsigned int

pool_size

)

Initialize the first AllocHeader with its size

Definition at line 88 of file MemoryPool.cpp.

References OpenDDS::DCPS::AllocHeader::alloc_size_, OpenDDS::DCPS::AllocHeader::prev_size_, and set_free().

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

{
  alloc_size_ = static_cast<int>(pool_size - sizeof(AllocHeader));
  prev_size_ = 0;
  set_free();
}

FreeHeader * OpenDDS::DCPS::FreeHeader::larger_free

(

unsigned char *

pool_base

)

const

Get next equal or larger free block in size order

Definition at line 116 of file MemoryPool.cpp.

References offset_larger_free_.

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

{
  FreeHeader* result = NULL;
  if (offset_larger_free_ != std::numeric_limits<size_t>::max()) {
    result = reinterpret_cast<FreeHeader*>(pool_base + offset_larger_free_);
  }
  return result;
}

void OpenDDS::DCPS::FreeHeader::set_free

(

)

Mark as free

Definition at line 96 of file MemoryPool.cpp.

References OpenDDS::DCPS::AllocHeader::alloc_size_, OpenDDS::DCPS::AllocHeader::is_free(), set_larger_free(), and set_smaller_free().

Referenced by init_free_block().

{
  // If this is newly freed
  if (!is_free()) {
    alloc_size_ *= -1;
    set_smaller_free(NULL, NULL);
    set_larger_free(NULL, NULL);
  }
}

void OpenDDS::DCPS::FreeHeader::set_larger_free	(	FreeHeader *	prev,
		unsigned char *	pool_base
	)

Set the next equal or larger free block in size order

Definition at line 136 of file MemoryPool.cpp.

References offset_larger_free_.

Referenced by OpenDDS::DCPS::MemoryPool::insert_free_alloc(), OpenDDS::DCPS::MemoryPool::remove_free_alloc(), and set_free().

{
  if (prev) {
    offset_larger_free_ = reinterpret_cast<unsigned char*>(prev) - pool_base;
  } else {
    offset_larger_free_ = std::numeric_limits<size_t>::max();
  }
}

void OpenDDS::DCPS::FreeHeader::set_smaller_free	(	FreeHeader *	next,
		unsigned char *	pool_base
	)

Set the next equal or smaller free block in size order

Definition at line 126 of file MemoryPool.cpp.

References offset_smaller_free_.

Referenced by OpenDDS::DCPS::MemoryPool::insert_free_alloc(), OpenDDS::DCPS::MemoryPool::remove_free_alloc(), and set_free().

{
  if (next) {
    offset_smaller_free_ = reinterpret_cast<unsigned char*>(next) - pool_base;
  } else {
    offset_smaller_free_ = std::numeric_limits<size_t>::max();
  }
}

FreeHeader * OpenDDS::DCPS::FreeHeader::smaller_free

(

unsigned char *

pool_base

)

const

Get next equal or smaller free block in size order

Definition at line 106 of file MemoryPool.cpp.

References offset_smaller_free_.

Referenced by OpenDDS::DCPS::FreeIndex::find(), OpenDDS::DCPS::MemoryPool::insert_free_alloc(), and OpenDDS::DCPS::MemoryPool::remove_free_alloc().

{
  FreeHeader* result = NULL;
  if (offset_smaller_free_ != std::numeric_limits<size_t>::max()) {
    result = reinterpret_cast<FreeHeader*>(pool_base + offset_smaller_free_);
  }
  return result;
}

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Member Data Documentation

size_t OpenDDS::DCPS::FreeHeader::offset_larger_free_ [private]

Offset to larger free block in size order.

Definition at line 84 of file MemoryPool.h.

Referenced by larger_free(), and set_larger_free().

size_t OpenDDS::DCPS::FreeHeader::offset_smaller_free_ [private]

Offset to smaller free block in size order.

Definition at line 83 of file MemoryPool.h.

Referenced by set_smaller_free(), and smaller_free().

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

• MemoryPool.h
• MemoryPool.cpp

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