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/* -*- C++ -*- */
//=============================================================================
/**
* @file Shared_Memory_MM.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
#ifndef ACE_SHARED_MALLOC_MM_H
#define ACE_SHARED_MALLOC_MM_H
#include /**/ "ace/pre.h"
#include "ace/Shared_Memory.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Mem_Map.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Shared_Memory_MM
*
* @brief Shared memory wrapper based on MMAP.
*
* This class provides a very simple-minded shared memory manager. We
* strongly recommend that you do NOT use this class. Instead, please
* use @c ACE_Malloc, which has much more powerful capabilities.
*/
class ACE_Export ACE_Shared_Memory_MM : public ACE_Shared_Memory
{
public:
/// Default constructor.
ACE_Shared_Memory_MM (void);
/// Constructor.
ACE_Shared_Memory_MM (ACE_HANDLE handle,
size_t length = static_cast<size_t> (-1),
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
char *addr = 0,
ACE_OFF_T pos = 0);
/// Constructor.
ACE_Shared_Memory_MM (const ACE_TCHAR *file_name,
size_t length = static_cast<size_t> (-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, ACE_OFF_T pos = 0);
/// Open method.
int open (ACE_HANDLE handle,
size_t length = static_cast<size_t> (-1),
int prot = PROT_RDWR,
int share = ACE_MAP_PRIVATE,
char *addr = 0,
ACE_OFF_T pos = 0);
/// Open method.
int open (const ACE_TCHAR *file_name,
size_t length = static_cast<size_t> (-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,
ACE_OFF_T pos = 0);
/// Return the name of file that is mapped (if any).
const ACE_TCHAR *filename () const;
/// Close down the shared memory segment.
virtual int close (void);
/// Remove the shared memory segment and the underlying file.
virtual int remove (void);
// = Allocation and deallocation methods.
/// Create a new chuck of memory containing @a size bytes.
virtual void *malloc (size_t size = 0);
/// Free a chuck of memory allocated by
/// <ACE_Shared_Memory_MM::malloc>.
virtual int free (void *p);
/// Return the size of the shared memory segment.
virtual size_t get_segment_size () const;
/// Return the ID of the shared memory segment (i.e., an ACE_HANDLE).
virtual ACE_HANDLE get_id () const;
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
/// This version is implemented with memory-mapped files.
ACE_Mem_Map shared_memory_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
#include "ace/Shared_Memory_MM.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /* ACE_SHARED_MALLOC_MM_H */
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