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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// SV_Shared_Memory.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#if !defined (ACE_SV_SHARED_MEMORY_H)
#define ACE_SV_SHARED_MEMORY_H
#include "ace/ACE.h"
class ACE_Export ACE_SV_Shared_Memory
// = TITLE
// This is a wrapper for System V shared memory.
{
public:
enum
{
ACE_CREATE = IPC_CREAT,
ACE_OPEN = 0
};
// = Initialization and termination methods.
ACE_SV_Shared_Memory (void);
ACE_SV_Shared_Memory (key_t external_id,
size_t size,
int create,
int perms = ACE_DEFAULT_FILE_PERMS,
void *virtual_addr = 0,
int flags = 0);
ACE_SV_Shared_Memory (ACE_HANDLE internal_id,
int flags = 0);
int open (key_t external_id,
size_t size,
int create = ACE_SV_Shared_Memory::ACE_OPEN,
int perms = ACE_DEFAULT_FILE_PERMS);
int open_and_attach (key_t external_id,
size_t size,
int create = ACE_SV_Shared_Memory::ACE_OPEN,
int perms = ACE_DEFAULT_FILE_PERMS,
void *virtual_addr = 0,
int flags = 0);
int attach (void *virtual_addr = 0,
int flags =0);
// Attach this shared memory segment.
int detach (void);
// Detach this shared memory segment.
int remove (void);
// Remove this shared memory segment.
int control (int cmd, void *buf);
// Forward to underlying System V <shmctl>.
// = Segment-related info.
void *get_segment_ptr (void) const;
int get_segment_size (void) const;
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.
protected:
enum
{
ALIGN_WORDB = 8 // Most restrictive alignment.
};
ACE_HANDLE internal_id_;
// Internal identifier.
int size_;
// Size of the mapped segment.
void *segment_ptr_;
// Pointer to the beginning of the segment.
int round_up (size_t len);
// Round up to an appropriate page size.
};
#if defined (__ACE_INLINE__)
#include "ace/SV_Shared_Memory.i"
#endif /* __ACE_INLINE__ */
#endif /* ACE_SV_SHARED_MEMORY_H */
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