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121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
// -*- C++ -*-
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//==========================================================================
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/**
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* @file SV_Shared_Memory.h
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*
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* $Id: SV_Shared_Memory.h 80826 2008-03-04 14:51:23Z wotte $
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*
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* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
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*/
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//==========================================================================
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#ifndef ACE_SV_SHARED_MEMORY_H
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#define ACE_SV_SHARED_MEMORY_H
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#include /**/ "ace/pre.h"
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#include /**/ "ace/ACE_export.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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#include "ace/os_include/sys/os_stat.h"
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#include "ace/os_include/sys/os_ipc.h"
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#include "ace/Default_Constants.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_SV_Shared_Memory
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*
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* @brief This is a wrapper for System V shared memory.
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*/
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class ACE_Export ACE_SV_Shared_Memory
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{
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public:
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enum
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{
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ACE_CREATE = IPC_CREAT,
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ACE_OPEN = 0
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};
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// = Initialization and termination methods.
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ACE_SV_Shared_Memory (void);
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ACE_SV_Shared_Memory (key_t external_id,
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size_t size,
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int create,
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int perms = ACE_DEFAULT_FILE_PERMS,
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void *virtual_addr = 0,
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int flags = 0);
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ACE_SV_Shared_Memory (ACE_HANDLE internal_id,
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int flags = 0);
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int open (key_t external_id,
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size_t size,
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int create = ACE_SV_Shared_Memory::ACE_OPEN,
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int perms = ACE_DEFAULT_FILE_PERMS);
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int open_and_attach (key_t external_id,
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size_t size,
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int create = ACE_SV_Shared_Memory::ACE_OPEN,
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int perms = ACE_DEFAULT_FILE_PERMS,
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void *virtual_addr = 0,
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int flags = 0);
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/// Attach this shared memory segment.
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int attach (void *virtual_addr = 0, int flags = 0);
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/// Detach this shared memory segment.
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int detach (void);
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/// Remove this shared memory segment.
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int remove (void);
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/// Forward to underlying System V <shmctl>.
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int control (int cmd, void *buf);
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// = Segment-related info.
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void *get_segment_ptr (void) const;
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size_t get_segment_size (void) const;
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/// Return the ID of the shared memory segment (i.e., an ACE_HANDLE).
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ACE_HANDLE get_id (void) const;
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/// Dump the state of an object.
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void dump (void) const;
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/// Declare the dynamic allocation hooks.
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ACE_ALLOC_HOOK_DECLARE;
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protected:
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enum
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{
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/// Most restrictive alignment.
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ALIGN_WORDB = 8
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};
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/// Internal identifier.
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ACE_HANDLE internal_id_;
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/// Size of the mapped segment.
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size_t size_;
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/// Pointer to the beginning of the segment.
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void *segment_ptr_;
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/// Round up to an appropriate page size.
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size_t round_up (size_t len);
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (__ACE_INLINE__)
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#include "ace/SV_Shared_Memory.inl"
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#endif /* __ACE_INLINE__ */
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#include /**/ "ace/post.h"
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#endif /* ACE_SV_SHARED_MEMORY_H */
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