MPQC 2.3.1
fileproc.h
1//
2// fileproc.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_fileproc_h
33#define _util_group_fileproc_h
34
35#include <sys/types.h>
36
37#include <util/group/memmsg.h>
38
39namespace sc {
40
43class ProcFileGrp: public FileGrp {
44 private:
45 int datafile_;
46 public:
50
52
53 void set_localsize(size_t);
54 void *localdata();
55
59 void release_readonly(void *data, distsize_t offset, int size);
60 void release_writeonly(void *data, distsize_t offset, int size);
61 void release_readwrite(void *data, distsize_t offset, int size);
62
63 void sync();
64};
65
66}
67
68#endif
69
70// Local Variables:
71// mode: c++
72// c-file-style: "CLJ"
73// End:
The FileGrp abstract class provides a way of accessing distributed file in a parallel machine.
Definition file.h:55
int size(int node)
Returns the amount of data residing on node.
Definition file.h:107
distsize_t offset(int node)
Returns the global offset to node's data.
Definition file.h:110
The ProcFileGrp concrete class provides an implementation of FileGrp for a single processor.
Definition fileproc.h:43
void * obtain_readwrite(distsize_t offset, int size)
Only one thread can have an unreleased obtain_readwrite at a time.
void * obtain_readonly(distsize_t offset, int size)
This gives read access to the file location. No locking is done.
void * obtain_writeonly(distsize_t offset, int size)
This gives write access to the data location. No locking is done.
void release_writeonly(void *data, distsize_t offset, int size)
This is called when write access is no longer needed.
void release_readonly(void *data, distsize_t offset, int size)
This is called when read access is no longer needed.
void set_localsize(size_t)
Set the size of locally held data.
ProcFileGrp * clone()
Clones the given FileGrp. The new FileGrp may need to be initialized additionally.
void release_readwrite(void *data, distsize_t offset, int size)
This is called when read/write access is no longer needed.
void sync()
Synchronizes all the nodes.
A template class that maintains references counts.
Definition ref.h:332
Definition memory.h:44

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