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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Shared_Memory_MM.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#ifndef ACE_SHARED_MALLOC_MM_H
#define ACE_SHARED_MALLOC_MM_H
#include "ace/Shared_Memory.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Mem_Map.h"
class ACE_Export ACE_Shared_Memory_MM : public ACE_Shared_Memory
{
// = TITLE
// Shared memory wrapper based on MMAP.
//
// = DESCRIPTION
// This class provides a very simple-minded shared memory
// manager. For more a powerful memory allocator please see
// <ACE_Malloc>.
public:
// = Initialization and termination methods.
ACE_Shared_Memory_MM (void);
// Default constructor.
ACE_Shared_Memory_MM (ACE_HANDLE handle,
int length = -1,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
char *addr = 0,
off_t pos = 0);
// Constructor.
ACE_Shared_Memory_MM (LPCTSTR file_name,
int len = -1,
int flags = O_RDWR | O_CREAT,
int mode = ACE_DEFAULT_FILE_PERMS,
int prot = PROT_RDWR,
int share = ACE_MAP_SHARED,
char *addr = 0, off_t pos = 0);
// Constructor.
int open (ACE_HANDLE handle,
int length = -1,
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
char *addr = 0,
off_t pos = 0);
// Open method.
int open (LPCTSTR file_name,
int len = -1,
int flags = O_RDWR | O_CREAT,
int mode = ACE_DEFAULT_FILE_PERMS,
int prot = PROT_RDWR,
int share = ACE_MAP_SHARED,
char *addr = 0,
off_t pos = 0);
// Open method.
const TCHAR *filename (void) const;
// Return the name of file that is mapped (if any).
virtual int close (void);
// Close down the shared memory segment.
virtual int remove (void);
// Remove the shared memory segment and the underlying file.
// = Allocation and deallocation methods.
virtual void *malloc (size_t size = 0);
// Create a new chuck of memory containing <size> bytes.
virtual int free (void *p);
// Free a chuck of memory allocated by
// <ACE_Shared_Memory_MM::malloc>.
virtual int get_segment_size (void) const;
// Return the size of the shared memory segment.
virtual ACE_HANDLE get_id (void) const;
// Return the ID of the shared memory segment (i.e., an ACE_HANDLE).
void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
ACE_Mem_Map shared_memory_;
// This version is implemented with memory-mapped files.
};
#if defined (__ACE_INLINE__)
#include "ace/Shared_Memory_MM.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_SHARED_MALLOC_MM_H */
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