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# ACE_MMAP_Memory_Pool_Options Class Reference

Helper class for MMAP Memory Pool constructor options. More...

`#include <Memory_Pool.h>`

List of all members.

## Public Types
enum | { FIRSTCALL_FIXED = 0, ALWAYS_FIXED = 1, NEVER_FIXED = 2 }
## Public Methods
| ACE_MMAP_Memory_Pool_Options (const void *base_addr=ACE_DEFAULT_BASE_ADDR, int use_fixed_addr=ALWAYS_FIXED, int write_each_page=1, off_t minimum_bytes=0, u_int flags=0, int guess_on_fault=1, LPSECURITY_ATTRIBUTES sa=0, mode_t file_mode=ACE_DEFAULT_FILE_PERMS)
## Public Attributes
const void * | base_addr_
| Base address of the memory-mapped backing store. More...
int | use_fixed_addr_
int | write_each_page_
| Should each page be written eagerly to avoid surprises later on? More...
off_t | minimum_bytes_
| What the minimim bytes of the initial segment should be. More...
u_int | flags_
| Any special flags that need to be used for <mmap>. More...
int | guess_on_fault_
LPSECURITY_ATTRIBUTES | sa_
| Pointer to a security attributes object. Only used on NT. More...
mode_t | file_mode_
| File mode for mmaped file, if it is created. More...

## Detailed Description

Helper class for MMAP Memory Pool constructor options.

This should be a nested class, but that breaks too many compilers.

## Member Enumeration Documentation

anonymous enum

  | Enumeration values:
  FIRSTCALL_FIXED | The base address from the first call to mmap will be used for subsequent calls to mmap.
  ALWAYS_FIXED | The base address specified in base_addr will be used in all calls to mmap.
  NEVER_FIXED | The base address will be selected by the OS for each call to mmap. Caution should be used with this mode since a call that requires the backing store to grow may change pointers that are cached by the application.

## Constructor & Destructor Documentation

ACE_MMAP_Memory_Pool_Options::ACE_MMAP_Memory_Pool_Options | ( | const void * | base_addr = ACE_DEFAULT_BASE_ADDR,
|  | int | use_fixed_addr = ALWAYS_FIXED,
|  | int | write_each_page = 1,
|  | off_t | minimum_bytes = 0,
|  | u_int | flags = 0,
|  | int | guess_on_fault = 1,
|  | LPSECURITY_ATTRIBUTES | sa = 0,
|  | mode_t | file_mode = ACE_DEFAULT_FILE_PERMS
| ) |

## Member Data Documentation

const void* ACE_MMAP_Memory_Pool_Options::base_addr_

| Base address of the memory-mapped backing store.

mode_t ACE_MMAP_Memory_Pool_Options::file_mode_

| File mode for mmaped file, if it is created.

u_int ACE_MMAP_Memory_Pool_Options::flags_

| Any special flags that need to be used for <mmap>.

int ACE_MMAP_Memory_Pool_Options::guess_on_fault_

| Try to remap without knowing the faulting address. This parameter is ignored on platforms that know the faulting address (UNIX with SI_ADDR and Win32).

off_t ACE_MMAP_Memory_Pool_Options::minimum_bytes_

| What the minimim bytes of the initial segment should be.

LPSECURITY_ATTRIBUTES ACE_MMAP_Memory_Pool_Options::sa_

| Pointer to a security attributes object. Only used on NT.

int ACE_MMAP_Memory_Pool_Options::use_fixed_addr_

| Determines whether we set <base_addr_> or if mmap(2) selects it FIRSTCALL_FIXED The base address from the first call to mmap will be used for subsequent calls to mmap ALWAYS_FIXED The base address specified in base_addr will be used in all calls to mmap. NEVER_FIXED The base address will be selected by the OS for each call to mmap. Caution should be used with this mode since a call that requires the backing store to grow may change pointers that are cached by the application.

int ACE_MMAP_Memory_Pool_Options::write_each_page_

| Should each page be written eagerly to avoid surprises later on?

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

- Memory_Pool.h
- Memory_Pool.cpp