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77b139121d
Now the random number generator state can be obtained in external (i.e. `read'/`write'-able) form via the new procedure `random-state->external'. An externalized state can be reinstantiated by calling `external->random-state'. * libguile/random.c (scm_i_init_rstate_scm, scm_i_expose_rstate): New internal functions. * libguile/random.c (scm_c_make_rstate_scm, scm_external_to_random_state, scm_random_state_to_external): New public functions. * libguile/random.h: Add prototypes for the above functions. * libguile/random.h (scm_t_rng): Add new fields `init_rstate_scm' and `expose_rstate'. * libguile/random.c (scm_init_random): Initialize the new fields in `scm_the_rng'.
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
/* classes: h_files */
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#ifndef SCM_RANDOM_H
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#define SCM_RANDOM_H
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/* Copyright (C) 1999,2000,2001, 2006, 2008, 2010 Free Software Foundation, Inc.
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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 License
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* as published by the Free Software Foundation; either version 3 of
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* 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, but
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* 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 Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include "libguile/__scm.h"
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/*
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* A plugin interface for RNGs
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*
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* Using this interface, it is possible for the application to tell
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* libguile to use a different RNG. This is desirable if it is
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* necessary to use the same RNG everywhere in the application in
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* order to prevent interference, if the application uses RNG
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* hardware, or if the application has special demands on the RNG.
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*
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* Look how the default generator is "plugged in" in scm_init_random().
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*/
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typedef struct scm_t_rstate {
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int reserved0;
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double reserved1;
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/* Custom fields follow here */
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} scm_t_rstate;
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typedef struct scm_t_rng {
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size_t rstate_size; /* size of random state */
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unsigned long (*random_bits) (scm_t_rstate *state); /* gives 32 random bits */
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void (*init_rstate) (scm_t_rstate *state, const char *seed, int n);
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scm_t_rstate *(*copy_rstate) (scm_t_rstate *state);
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void (*init_rstate_scm) (scm_t_rstate *state, SCM exposed);
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SCM (*expose_rstate) (scm_t_rstate *state);
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} scm_t_rng;
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SCM_API scm_t_rng scm_the_rng;
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/*
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* Default RNG
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*/
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typedef struct scm_t_i_rstate {
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scm_t_rstate rstate;
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unsigned long w;
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unsigned long c;
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} scm_t_i_rstate;
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SCM_INTERNAL unsigned long scm_i_uniform32 (scm_t_i_rstate *);
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SCM_INTERNAL void scm_i_init_rstate (scm_t_i_rstate *, const char *seed, int n);
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SCM_INTERNAL scm_t_i_rstate *scm_i_copy_rstate (scm_t_i_rstate *);
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SCM_INTERNAL void scm_i_init_rstate_scm (scm_t_i_rstate *state, SCM value);
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SCM_INTERNAL SCM scm_i_expose_rstate (scm_t_i_rstate *state);
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/*
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* Random number library functions
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*/
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SCM_API scm_t_rstate *scm_c_make_rstate (const char *, int);
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SCM_API scm_t_rstate *scm_c_make_rstate_scm (SCM external);
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SCM_API scm_t_rstate *scm_c_default_rstate (void);
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#define scm_c_uniform32(RSTATE) scm_the_rng.random_bits (RSTATE)
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SCM_API double scm_c_uniform01 (scm_t_rstate *);
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SCM_API double scm_c_normal01 (scm_t_rstate *);
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SCM_API double scm_c_exp1 (scm_t_rstate *);
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SCM_API unsigned long scm_c_random (scm_t_rstate *, unsigned long m);
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SCM_API SCM scm_c_random_bignum (scm_t_rstate *, SCM m);
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/*
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* Scheme level interface
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*/
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SCM_API scm_t_bits scm_tc16_rstate;
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#define SCM_RSTATEP(obj) SCM_SMOB_PREDICATE (scm_tc16_rstate, obj)
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#define SCM_RSTATE(obj) ((scm_t_rstate *) SCM_SMOB_DATA (obj))
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SCM_API unsigned char scm_masktab[256];
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SCM_API SCM scm_var_random_state;
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SCM_API SCM scm_random (SCM n, SCM state);
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SCM_API SCM scm_copy_random_state (SCM state);
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SCM_API SCM scm_seed_to_random_state (SCM seed);
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SCM_API SCM scm_random_uniform (SCM state);
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SCM_API SCM scm_random_solid_sphere_x (SCM v, SCM state);
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SCM_API SCM scm_random_hollow_sphere_x (SCM v, SCM state);
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SCM_API SCM scm_random_normal (SCM state);
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SCM_API SCM scm_random_normal_vector_x (SCM v, SCM state);
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SCM_API SCM scm_random_exp (SCM state);
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SCM_INTERNAL void scm_init_random (void);
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#endif /* SCM_RANDOM_H */
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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