root/main/branches/64_bit_Greenstone/greenstone2/common-src/indexers/mg/lib/random.h @ 24031

Revision 24031, 1.6 KB (checked in by jmt12, 8 years ago)

Found mg indexing randomly broke on 64bit machines. Tracked it down to random.c and perf_hash.c. Replaced all occurances of 'long' (which is not well defined on 64 bit machines) with the more stable mg_s_long (mglong.h) to fix this issue.

  • Property svn:executable set to *
  • Property svn:keywords set to Author Date Id Revision
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1/**************************************************************************
2 *
3 * random.h -- pseudo random number generator
4 * Copyright (C) 1994  Chris Wallace (csw@bruce.cs.monash.edu.au)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 **************************************************************************/
21
22#ifndef RANDOM_H
23#define RANDOM_H
24
25/*
26 *  A random number generator called as a function by
27 *  random (iseed)  or  irandm (iseed)
28 *  The parameter should be a pointer to a 2-element long vector.
29 *  The first function returns a double uniform in 0 .. 1.
30 *  The second returns a long integer uniform in 0 .. 2**31-1
31 *  Both update iseed[] in exactly the same way.
32 *  iseed[] must be a 2-element integer vector.
33 *  The initial value of the second element may be anything.
34 *
35 *  The period of the random sequence is 2**32 * (2**32-1)
36 *  The table mt[0:127] is defined by mt[i] = 69069 ** (128-i)
37 */
38#include "mglong.h"
39
40double random (mg_s_long is [2]);
41mg_s_long irandm (mg_s_long is [2]);
42
43#endif
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