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80591652ff
Fri Dec 19 11:49:21 2003 George Lebl <jirka@5z.com>
* glib/grand.c
glib/grand.h (g_rand_new) (g_rand_new_with_seed)
(g_rand_new_with_seed_array) (g_rand_set_seed_array): Add
the init_by_array functionality from the reference implementation
of the mersenne twister (mt19937ar.c) and change the naming
to fit with the rest of the grand API. New functions are
g_rand_new_with_seed_array, g_rand_set_seed_array. This is only
reliable/tested for the 2.2 version of the seeding as that's what
the reference implementation uses. Also modify g_rand_new to
get 4 longs from /dev/urandom since that will always be available
anyway and we get more entropy and if /dev/urandom is unavailable
use also 4 longs for seeding using secs, usecs, getpid and getppid.
For version 2.0 use only a simple seed again but be more careful
about seeding with secs/usecs in this case.
* glib/grand.c
glib/grand.h (g_rand_copy): Add g_rand_copy function to copy the
current state of the random number generator.
* glib/grand.c (g_rand_new): Add testing for EINTR when reading
from /dev/urandom
* tests/rand-test.c: add testing of the array seeding stuff against
the reference implementation, plus add statistical sanity check
to see that the values outputted are truly kind of random. And
check that g_rand_copy truly copies the state by checking a few
terms.
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_RAND_H__
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#define __G_RAND_H__
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#include <glib/gtypes.h>
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G_BEGIN_DECLS
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typedef struct _GRand GRand;
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/* GRand - a good and fast random number generator: Mersenne Twister
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* see http://www.math.keio.ac.jp/~matumoto/emt.html for more info.
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* The range functions return a value in the intervall [begin, end).
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* int -> [0..2^32-1]
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* int_range -> [begin..end-1]
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* double -> [0..1)
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* double_range -> [begin..end)
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*/
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GRand* g_rand_new_with_seed (guint32 seed);
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GRand* g_rand_new_with_seed_array (const guint32 *seed,
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guint seed_length);
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GRand* g_rand_new (void);
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void g_rand_free (GRand *rand_);
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GRand* g_rand_copy (GRand *rand_);
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void g_rand_set_seed (GRand *rand_,
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guint32 seed);
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void g_rand_set_seed_array (GRand *rand_,
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const guint32 *seed,
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guint seed_length);
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#define g_rand_boolean(rand_) ((g_rand_int (rand_) & (1 << 15)) != 0)
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guint32 g_rand_int (GRand *rand_);
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gint32 g_rand_int_range (GRand *rand_,
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gint32 begin,
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gint32 end);
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gdouble g_rand_double (GRand *rand_);
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gdouble g_rand_double_range (GRand *rand_,
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gdouble begin,
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gdouble end);
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void g_random_set_seed (guint32 seed);
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#define g_random_boolean() ((g_random_int () & (1 << 15)) != 0)
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guint32 g_random_int (void);
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gint32 g_random_int_range (gint32 begin,
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gint32 end);
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gdouble g_random_double (void);
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gdouble g_random_double_range (gdouble begin,
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gdouble end);
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G_END_DECLS
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#endif /* __G_RAND_H__ */
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