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Etienne Schmitt
CGoGN
Commits
223428d1
Commit
223428d1
authored
Mar 04, 2011
by
Kenneth Vanhoey
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Merge branch 'master' of cgogn:~cgogn/CGoGN
parents
f1beaeb8
f07107a2
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include/Utils/shared_mem.h
include/Utils/shared_mem.h
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include/Utils/shared_mem.hpp
include/Utils/shared_mem.hpp
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include/Utils/shared_mem.h
0 → 100644
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223428d1
/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps *
* version 0.1 *
* Copyright (C) 2009, IGG Team, LSIIT, University of Strasbourg *
* *
* This library is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your *
* option) any later version. *
* *
* This library is distributed in the hope that it will be useful, but WITHOUT *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License *
* for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this library; if not, write to the Free Software Foundation, *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
* Web site: https://iggservis.u-strasbg.fr/CGoGN/ *
* Contact information: cgogn@unistra.fr *
* *
*******************************************************************************/
#ifndef __CGoGN_MEM_SHARED_
#define __CGoGN_MEM_SHARED_
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <iostream>
namespace
CGoGN
{
namespace
Utils
{
/**
* Shared Memory Segment management
* Example:
* in master:
* SharedMem<MY_DATA> shm;
* shm.initMaster(4321);
* ...
* *(shm.lockForWrite()) = localData;
* shm.release();
* ...
* in slave
* SharedMem<MY_DATA> shm;
* shm.initSlace(4321);
* ...
* MY_DATA localData = *(shm.dataRead());
* ...
*/
template
<
typename
DATA
>
class
SharedMemSeg
{
protected:
int
m_mem_id
;
int
*
m_ptr
;
DATA
*
m_ptr1
;
DATA
*
m_ptr2
;
public:
/**
* Constructor
*/
SharedMemSeg
();
/**
* Destructor
*/
~
SharedMemSeg
();
/**
* Initialization for master
* @param key key of shared mem zone
*/
bool
initMaster
(
int
key
);
/**
* Initialization for master
* @param key key of shared mem zone
*/
bool
initSlave
(
int
key
);
/**
* read data
* @return a pointer on data (for copy or read)
*/
DATA
*
dataRead
();
/**
* lock data for writing.
* @return a pointer on data (back buffer) to copy data in
*/
DATA
*
lockForWrite
();
/**
* release the data ( switch ptr from back to front)
*/
void
release
();
};
}
}
#include "Utils/shared_mem.hpp"
#endif
include/Utils/shared_mem.hpp
0 → 100644
View file @
223428d1
/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps *
* version 0.1 *
* Copyright (C) 2009, IGG Team, LSIIT, University of Strasbourg *
* *
* This library is free software; you can redistribute it and/or modify it *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your *
* option) any later version. *
* *
* This library is distributed in the hope that it will be useful, but WITHOUT *
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or *
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License *
* for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this library; if not, write to the Free Software Foundation, *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
* *
* Web site: https://iggservis.u-strasbg.fr/CGoGN/ *
* Contact information: cgogn@unistra.fr *
* *
*******************************************************************************/
namespace
CGoGN
{
namespace
Utils
{
template
<
typename
DATA
>
SharedMemSeg
<
DATA
>::
SharedMemSeg
()
:
m_ptr
(
NULL
)
{
}
template
<
typename
DATA
>
SharedMemSeg
<
DATA
>::~
SharedMemSeg
()
{
if
(
m_ptr
!=
NULL
)
{
struct
shmid_ds
buf
;
shmctl
(
m_mem_id
,
IPC_RMID
,
&
buf
);
shmdt
(
m_ptr
);
}
}
template
<
typename
DATA
>
bool
SharedMemSeg
<
DATA
>::
initMaster
(
int
key
)
{
m_mem_id
=
shmget
(
key
,
2
*
sizeof
(
DATA
)
+
2
*
sizeof
(
int
),
IPC_CREAT
|
0666
);
if
(
m_mem_id
<
0
)
{
std
::
cerr
<<
"Error shmget"
<<
std
::
endl
;
return
false
;
}
m_ptr
=
reinterpret_cast
<
int
*>
(
shmat
(
m_mem_id
,
NULL
,
0
));
if
(
m_ptr
==
(
int
*
)
-
1
)
{
std
::
cerr
<<
"Error shmat"
<<
std
::
endl
;
return
false
;
}
m_ptr1
=
reinterpret_cast
<
DATA
*>
(
m_ptr
+
2
);
m_ptr2
=
m_ptr1
+
1
;
*
m_ptr
=
0
;
}
template
<
typename
DATA
>
bool
SharedMemSeg
<
DATA
>::
initSlave
(
int
key
)
{
m_mem_id
=
shmget
(
key
,
2
*
sizeof
(
DATA
)
+
2
*
sizeof
(
int
),
0444
);
if
(
m_mem_id
<
0
)
{
std
::
cerr
<<
"Shared Memory "
<<
key
<<
" does not exist can not read"
<<
std
::
endl
;
return
false
;
}
m_ptr
=
reinterpret_cast
<
int
*>
(
shmat
(
m_mem_id
,
NULL
,
0
));
if
(
m_ptr
==
(
int
*
)
-
1
)
{
std
::
cerr
<<
"Problem getting shared memory ptr for "
<<
key
<<
std
::
endl
;
return
false
;
}
m_ptr1
=
reinterpret_cast
<
DATA
*>
(
m_ptr
+
2
);
m_ptr2
=
m_ptr1
+
1
;
*
(
int
*
)
m_ptr
=
0
;
}
template
<
typename
DATA
>
DATA
*
SharedMemSeg
<
DATA
>::
dataRead
()
{
if
(
*
m_ptr
==
0
)
return
m_ptr1
;
return
m_ptr2
;
}
template
<
typename
DATA
>
DATA
*
SharedMemSeg
<
DATA
>::
lockForWrite
()
{
if
(
*
m_ptr
==
0
)
return
m_ptr2
;
return
m_ptr1
;
}
template
<
typename
DATA
>
void
SharedMemSeg
<
DATA
>::
release
()
{
*
m_ptr
=
1
-
*
m_ptr
;
//invert id
}
}
}
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