---
name: "ACE_Shared_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_Shared_Memory_Pool_Options"
---

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

Helper class for Shared Memory Pool constructor options.

## NAME

ACE\_Shared\_Memory\_Pool\_Options -  Helper class for Shared Memory Pool constructor options.

## SYNOPSIS

```
#include <ace/ACE_Memory_Pool.h>
class ACE_Shared_Memory_Pool_Options
{
  public:
    ACE_Shared_Memory_Pool_Options (
        const char *base_addr = ACE_DEFAULT_BASE_ADDR,
        size_t max_segments = ACE_DEFAULT_MAX_SEGMENTS,
        size_t file_perms = ACE_DEFAULT_FILE_PERMS,
        off_t minimum_bytes = 0,
        size_t segment_size = ACE_DEFAULT_SEGMENT_SIZE
        );
    const char *base_addr_;
    size_t max_segments_;
    off_t minimum_bytes_;
    size_t file_perms_;
    size_t segment_size_;
};
```

## DESCRIPTION

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

## Initialization method.

```
ACE_Shared_Memory_Pool_Options (
    const char *base_addr = ACE_DEFAULT_BASE_ADDR,
    size_t max_segments = ACE_DEFAULT_MAX_SEGMENTS,
    size_t file_perms = ACE_DEFAULT_FILE_PERMS,
    off_t minimum_bytes = 0,
    size_t segment_size = ACE_DEFAULT_SEGMENT_SIZE
    );
```

```
const char *base_addr_;
```

Base address of the memory-mapped backing store.

```
size_t max_segments_;
```

Number of shared memory segments to allocate.

```
off_t minimum_bytes_;
```

What the minimum bytes of the initial segment should be.

```
size_t file_perms_;
```

File permissions to use when creating/opening a segment.

```
size_t segment_size_;
```

Shared memory segment size.

## AUTHOR

Doug Schmidt and Prashant Jain

## LIBRARY

ace