ACE_Pagefile_Memory_Pool Class Reference

Make a memory pool that is based on "anonymous" memory regions allocated from the Win32 page file. More...

#include <Pagefile_Memory_Pool.h>

Collaboration diagram for ACE_Pagefile_Memory_Pool:

[legend]List of all members.

Public Types
typedef ACE_Pagefile_Memory_Pool_Options	OPTIONS
Public Member Functions
	ACE_Pagefile_Memory_Pool (const ACE_TCHAR *backing_store_name=0, const OPTIONS *options=0)
	Initialize the pool.
void *	init_acquire (size_t nbytes, size_t &rounded_bytes, int &first_time)
	Ask system for initial chunk of shared memory.
void *	acquire (size_t nbytes, size_t &rounded_bytes)
int	release (int destroy=1)
	Instruct the memory pool to release all of its resources.
virtual int	seh_selector (void *)
int	remap (void *addr)
size_t	round_to_page_size (size_t nbytes)
	Round up to system page size.
size_t	round_to_chunk_size (size_t nbytes)
	Round up to the chunk size required by the operation system.
int	sync (ssize_t=-1, int=MS_SYNC)
int	sync (void *, size_t, int=MS_SYNC)
int	protect (ssize_t=-1, int=PROT_RDWR)
int	protect (void *, size_t, int=PROT_RDWR)
virtual void *	base_addr (void) const
void	dump (void) const
Protected Member Functions
int	map (int &firstTime, size_t appendBytes=0)
int	unmap (void)
	Release the mapping.
Private Attributes
Control_Block	local_cb_
	Description of what our process mapped.
Control_Block *	shared_cb_
	Shared memory pool statistics.
ACE_HANDLE	object_handle_
	File mapping handle.
size_t	page_size_
	System page size.
ACE_TCHAR	backing_store_name_ [MAXPATHLEN]
	Name of the backing store where the shared memory pool is kept.

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Detailed Description

Make a memory pool that is based on "anonymous" memory regions allocated from the Win32 page file.

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Member Typedef Documentation

typedef ACE_Pagefile_Memory_Pool_Options ACE_Pagefile_Memory_Pool::OPTIONS

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Constructor & Destructor Documentation

ACE_Pagefile_Memory_Pool::ACE_Pagefile_Memory_Pool (  const ACE_TCHAR *  backing_store_name = 0, const OPTIONS *  options = 0 )

Initialize the pool.

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Member Function Documentation

void * ACE_Pagefile_Memory_Pool::acquire (  size_t  nbytes, size_t &  rounded_bytes )

Acquire at least <nbytes> from the memory pool. <rounded_bytes> is the actual number of bytes allocated.

virtual void* ACE_Pagefile_Memory_Pool::base_addr (  void   )  const [virtual]

Return the base address of this memory pool, 0 if base_addr never changes.

void ACE_Pagefile_Memory_Pool::dump (  void   )  const [inline]

void * ACE_Pagefile_Memory_Pool::init_acquire (  size_t  nbytes, size_t &  rounded_bytes, int &  first_time )

Ask system for initial chunk of shared memory.

int ACE_Pagefile_Memory_Pool::map (  int &  firstTime, size_t  appendBytes = 0 )  [protected]

Map portions or the entire pool into the local virtual address space. To do this, we compute the new file_offset of the backing store and commit the memory.

int ACE_Pagefile_Memory_Pool::protect (  void *  , size_t  , int  = PROT_RDWR )

int ACE_Pagefile_Memory_Pool::protect (  ssize_t  = -1, int  = PROT_RDWR )

int ACE_Pagefile_Memory_Pool::release (  int  destroy = 1  )

Instruct the memory pool to release all of its resources.

int ACE_Pagefile_Memory_Pool::remap (  void *  addr  )

Try to extend the virtual address space so that <addr> is now covered by the address mapping. The method succeeds and returns 0 if the backing store has adequate memory to cover this address. Otherwise, it returns -1. This method is typically called by an exception handler for a Win32 structured exception when another process has grown the backing store (and its mapping) and our process now incurs a fault because our mapping isn't in range (yet).

size_t ACE_Pagefile_Memory_Pool::round_to_chunk_size (  size_t  nbytes  )

Round up to the chunk size required by the operation system.

size_t ACE_Pagefile_Memory_Pool::round_to_page_size (  size_t  nbytes  )

Round up to system page size.

int ACE_Pagefile_Memory_Pool::seh_selector (  void *   )  [virtual]

Win32 Structural exception selector. The return value decides how to handle memory pool related structural exceptions. Returns 1, 0, or , -1.

int ACE_Pagefile_Memory_Pool::sync (  void *  , size_t  , int  = MS_SYNC )

int ACE_Pagefile_Memory_Pool::sync (  ssize_t  = -1, int  = MS_SYNC )

int ACE_Pagefile_Memory_Pool::unmap (  void   )  [protected]

Release the mapping.

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Member Data Documentation

ACE_TCHAR ACE_Pagefile_Memory_Pool::backing_store_name_[MAXPATHLEN] [private]

Name of the backing store where the shared memory pool is kept.

Control_Block ACE_Pagefile_Memory_Pool::local_cb_ [private]

Description of what our process mapped.

ACE_HANDLE ACE_Pagefile_Memory_Pool::object_handle_ [private]

File mapping handle.

size_t ACE_Pagefile_Memory_Pool::page_size_ [private]

System page size.

Control_Block* ACE_Pagefile_Memory_Pool::shared_cb_ [private]

Shared memory pool statistics.

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

• Pagefile_Memory_Pool.h
• Pagefile_Memory_Pool.cpp

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