MPQC 2.3.1
memproc.h
1//
2// memproc.h
3//
4// Copyright (C) 1996 Limit Point Systems, Inc.
5//
6// Author: Curtis Janssen <cljanss@limitpt.com>
7// Maintainer: LPS
8//
9// This file is part of the SC Toolkit.
10//
11// The SC Toolkit is free software; you can redistribute it and/or modify
12// it under the terms of the GNU Library General Public License as published by
13// the Free Software Foundation; either version 2, or (at your option)
14// any later version.
15//
16// The SC Toolkit is distributed in the hope that it will be useful,
17// but WITHOUT ANY WARRANTY; without even the implied warranty of
18// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19// GNU Library General Public License for more details.
20//
21// You should have received a copy of the GNU Library General Public License
22// along with the SC Toolkit; see the file COPYING.LIB. If not, write to
23// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24//
25// The U.S. Government is granted a limited license as per AL 91-7.
26//
27
28#ifdef __GNUC__
29#pragma interface
30#endif
31
32#ifndef _util_group_memproc_h
33#define _util_group_memproc_h
34
35#include <sys/types.h>
36
37#include <util/group/memmsg.h>
38
39namespace sc {
40
43class ProcMemoryGrp: public MemoryGrp {
44 private:
45 char *data_;
46 public:
50
51 void set_localsize(size_t);
52 void *localdata();
53
57 void release_readonly(void *data, distsize_t offset, int size);
58 void release_writeonly(void *data, distsize_t offset, int size);
59 void release_readwrite(void *data, distsize_t offset, int size);
60
61 void sync();
62};
63
64}
65
66#endif
67
68// Local Variables:
69// mode: c++
70// c-file-style: "CLJ"
71// End:
The MemoryGrp abstract class provides a way of accessing distributed memory in a parallel machine.
Definition: memory.h:124
int size(int node)
Returns the amount of memory residing on node.
Definition: memory.h:165
distsize_t offset(int node)
Returns the global offset to node's memory.
Definition: memory.h:168
The ProcMemoryGrp concrete class provides an implementation of MemoryGrp for a single processor.
Definition: memproc.h:43
void * localdata()
Returns a pointer to the local data.
void set_localsize(size_t)
Set the size of locally held memory.
void sync()
Synchronizes all the nodes.
void * obtain_readonly(distsize_t offset, int size)
This gives read access to the memory location. No locking is done.
void * obtain_readwrite(distsize_t offset, int size)
Only one thread can have an unreleased obtain_readwrite at a time.
void release_readonly(void *data, distsize_t offset, int size)
This is called when read access is no longer needed.
void release_readwrite(void *data, distsize_t offset, int size)
This is called when read/write access is no longer needed.
void release_writeonly(void *data, distsize_t offset, int size)
This is called when write access is no longer needed.
void * obtain_writeonly(distsize_t offset, int size)
This gives write access to the memory location. No locking is done.
A template class that maintains references counts.
Definition: ref.h:332
Definition: memory.h:44

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