summaryrefslogtreecommitdiff
path: root/xbase64/xblock.h
blob: 50dfcf295f881c040eeb0aba463395be92ba49e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/*  xblock.h

    Xbase project source code
  
    This file conatains a header file for the xbLock virtual objects which
    is used for controlling file and record locking.  Record and file
    locking has been rewritten in version 3.

    Copyright (C) 1997,2003  Gary A Kunkel
    
    This program 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 of the License, or
    (at your option) any later version.

    This program 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 program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


    Contact:
    
     Email:
    
      xdb-devel@lists.sourceforge.net
      xdb-users@lists.sourceforge.net
      
      
     Regular Mail:
     
       XBase Support
       149C South Main St
       Keller Texas, 76248     
       USA
*/

/*! \file xblock.h
*/

#ifndef __XB_XBLOCK_H__
#define __XB_XBLOCK_H__

#ifdef __GNU LesserG__
#pragma interface
#endif

#ifdef XB_LOCKING_ON

//! xbLock class
/*!
*/

class XBDLLEXPORT xbLock
{
public:
  xbLock( xbDbf * dbf );
  virtual ~xbLock();
  virtual xbShort LockTableHeader( xbShort LockType ) = 0;
  virtual xbShort LockTable( xbShort LockType ) = 0;
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len ) = 0;
  virtual xbShort LockMemo( xbShort LockType ) = 0;
  virtual xbShort LockIndex( xbShort LockType ) = 0;
  virtual xbShort UnlockAll() = 0;
  virtual xbShort LockInit() { return XB_NO_ERROR; }

protected:
  xbDbf   *dbf;
  xbShort HdrLockCnt;
  xbShort TableLockCnt;
  xbShort MemoLockCnt;
  xbShort IndexLockCnt;
  xbShort LockFile( int fn, xbShort LockType, xbOffT lockLen  );
};

class XBDLLEXPORT xbaseLock : xbLock
{
public:
  xbaseLock( xbDbf * pdbf );
  virtual ~xbaseLock() {}
  virtual xbShort LockTableHeader( xbShort LockType );
  virtual xbShort LockTable( xbShort LockType );
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
  virtual xbShort LockMemo( xbShort LockType ); 
  virtual xbShort LockIndex( xbShort LockType ); 
  virtual xbShort UnlockAll(); 
  virtual xbShort LockInit();
private:
  FILE    *lfh;                    /* lock file handle */

};

class XBDLLEXPORT dbaseLock : xbLock
{
public:
  dbaseLock( xbDbf * pdbf );
  virtual ~dbaseLock() {}
  virtual xbShort LockTableHeader( xbShort LockType );
  virtual xbShort LockTable( xbShort LockType );
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
  virtual xbShort LockMemo( xbShort LockType ); 
  virtual xbShort LockIndex( xbShort LockType ); 
  virtual xbShort UnlockAll(); 
};


class XBDLLEXPORT clipperLock : xbLock
{
public:
  clipperLock( xbDbf * pdbf );
  virtual ~clipperLock() {}
  virtual xbShort LockTableHeader( xbShort LockType );
  virtual xbShort LockTable( xbShort LockType );
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
  virtual xbShort LockMemo( xbShort LockType ); 
  virtual xbShort LockIndex( xbShort LockType ); 
  virtual xbShort UnlockAll(); 
};

class XBDLLEXPORT foxproLock : xbLock
{
public:
  foxproLock( xbDbf * pdbf );
  virtual ~foxproLock() {}
  virtual xbShort LockTableHeader( xbShort LockType );
  virtual xbShort LockTable( xbShort LockType );
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo, xbOffT len );
  virtual xbShort LockMemo( xbShort LockType ); 
  virtual xbShort LockIndex( xbShort LockType ); 
  virtual xbShort UnlockAll(); 
};

class XBDLLEXPORT noLock : xbLock
{
public:
  noLock( xbDbf * pdbf ) : xbLock( pdbf ) {};
  virtual ~noLock() {}
  virtual xbShort LockTableHeader( xbShort LockType )
            { return XB_NO_ERROR; }
  virtual xbShort LockTable( xbShort LockType )
            { return XB_NO_ERROR; }
  virtual xbShort LockRecord( xbShort LockType, xbULong RecNo )
            { return XB_NO_ERROR; }
  virtual xbShort LockMemo( xbShort LockType )
            { return XB_NO_ERROR; }
  virtual xbShort LockIndex( xbShort LockType )
            { return XB_NO_ERROR; }
  virtual xbShort UnlockAll()
            { return XB_NO_ERROR; }
};




#endif   // XB_LOCKING_ON
#endif   // __XB_XBLOCK_H__