---
name: "ACE_MMAP_Memory_Pool_Options"
section: "3"
platform: "linux"
package: "libace-doc"
version: "5.0.7-4"
release: "Debian 2.2 (Potato)"
platforms: ["linux"]
url: "https://new.carta.tech/ACE_MMAP_Memory_Pool_Options"
---

# ACE\_MMAP\_Memory\_Pool\_Options(3)

Helper class for MMAP Memory Pool constructor options.

## NAME

ACE\_MMAP\_Memory\_Pool\_Options -  Helper class for MMAP Memory Pool constructor options.

## SYNOPSIS

```
#include <ace/ACE_Memory_Pool.h>
class ACE_MMAP_Memory_Pool_Options
{
  public:
    ACE_MMAP_Memory_Pool_Options (
        const void *base_addr = ACE_DEFAULT_BASE_ADDR,
        int use_fixed_addr = 1,
        int write_each_page = 1,
        off_t minimum_bytes = 0,
        u_int flags = 0,
        int guess_on_fault = 1,
        LPSECURITY_ATTRIBUTES sa = 0
        );
    const void *base_addr_;
    int use_fixed_addr_;
    int write_each_page_;
    off_t minimum_bytes_;
    u_int flags_;
    int guess_on_fault_;
    LPSECURITY_ATTRIBUTES sa_;
};
```

## DESCRIPTION

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

## Initialization method.

```
ACE_MMAP_Memory_Pool_Options (
    const void *base_addr = ACE_DEFAULT_BASE_ADDR,
    int use_fixed_addr = 1,
    int write_each_page = 1,
    off_t minimum_bytes = 0,
    u_int flags = 0,
    int guess_on_fault = 1,
    LPSECURITY_ATTRIBUTES sa = 0
    );
```

```
const void *base_addr_;
```

Base address of the memory-mapped backing store.

```
int use_fixed_addr_;
```

Must we use the base\_addr\_ or can we let [mmap(2)](/mmap/2.md) select it?

```
int write_each_page_;
```

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

```
off_t minimum_bytes_;
```

What the minimim bytes of the initial segment should be.

```
u_int flags_;
```

Any special flags that need to be used for mmap.

```
int 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).

```
LPSECURITY_ATTRIBUTES sa_;
```

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

## AUTHOR

Doug Schmidt and Prashant Jain

## LIBRARY

ace