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# 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.

## Detailed Description

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

## Member Typedef Documentation

typedef ACE_Pagefile_Memory_Pool_Options ACE_Pagefile_Memory_Pool::OPTIONS

## 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.

## 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.

## 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.

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

- Pagefile_Memory_Pool.h
- Pagefile_Memory_Pool.cpp