| | 1 | /* classes: h_files */ |
| | 2 | |
| | 3 | #ifndef SCM_RANDOM_H |
| | 4 | #define SCM_RANDOM_H |
| | 5 | |
| | 6 | /* Copyright (C) 1999,2000,2001, 2006, 2008, 2010 Free Software Foundation, Inc. |
| | 7 | * |
| | 8 | * This library is free software; you can redistribute it and/or |
| | 9 | * modify it under the terms of the GNU Lesser General Public License |
| | 10 | * as published by the Free Software Foundation; either version 3 of |
| | 11 | * the License, or (at your option) any later version. |
| | 12 | * |
| | 13 | * This library is distributed in the hope that it will be useful, but |
| | 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| | 16 | * Lesser General Public License for more details. |
| | 17 | * |
| | 18 | * You should have received a copy of the GNU Lesser General Public |
| | 19 | * License along with this library; if not, write to the Free Software |
| | 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| | 21 | * 02110-1301 USA |
| | 22 | */ |
| | 23 | |
| | 24 | \f |
| | 25 | |
| | 26 | #include "libguile/__scm.h" |
| | 27 | |
| | 28 | \f |
| | 29 | /* |
| | 30 | * A plugin interface for RNGs |
| | 31 | * |
| | 32 | * Using this interface, it is possible for the application to tell |
| | 33 | * libguile to use a different RNG. This is desirable if it is |
| | 34 | * necessary to use the same RNG everywhere in the application in |
| | 35 | * order to prevent interference, if the application uses RNG |
| | 36 | * hardware, or if the application has special demands on the RNG. |
| | 37 | * |
| | 38 | * Look how the default generator is "plugged in" in scm_init_random(). |
| | 39 | */ |
| | 40 | |
| | 41 | typedef struct scm_t_rstate { |
| | 42 | struct scm_t_rng *rng; |
| | 43 | double normal_next; /* For scm_c_normal01 */ |
| | 44 | /* Custom fields follow here */ |
| | 45 | } scm_t_rstate; |
| | 46 | |
| | 47 | typedef struct scm_t_rng { |
| | 48 | size_t rstate_size; /* size of random state */ |
| | 49 | scm_t_uint32 (*random_bits) (scm_t_rstate *state); /* gives 32 random bits */ |
| | 50 | void (*init_rstate) (scm_t_rstate *state, const char *seed, int n); |
| | 51 | scm_t_rstate *(*copy_rstate) (scm_t_rstate *state); |
| | 52 | void (*from_datum) (scm_t_rstate *state, SCM datum); |
| | 53 | SCM (*to_datum) (scm_t_rstate *state); |
| | 54 | } scm_t_rng; |
| | 55 | |
| | 56 | SCM_API scm_t_rng scm_the_rng; |
| | 57 | |
| | 58 | \f |
| | 59 | /* |
| | 60 | * Random number library functions |
| | 61 | */ |
| | 62 | SCM_API scm_t_rstate *scm_c_make_rstate (const char *, int); |
| | 63 | SCM_API scm_t_rstate *scm_c_rstate_from_datum (SCM datum); |
| | 64 | SCM_API scm_t_rstate *scm_c_default_rstate (void); |
| | 65 | #define scm_c_uniform32(RSTATE) ((RSTATE)->rng->random_bits (RSTATE)) |
| | 66 | SCM_API double scm_c_uniform01 (scm_t_rstate *); |
| | 67 | SCM_API double scm_c_normal01 (scm_t_rstate *); |
| | 68 | SCM_API double scm_c_exp1 (scm_t_rstate *); |
| | 69 | SCM_API scm_t_uint32 scm_c_random (scm_t_rstate *, scm_t_uint32 m); |
| | 70 | SCM_API scm_t_uint64 scm_c_random64 (scm_t_rstate *state, scm_t_uint64 m); |
| | 71 | SCM_API SCM scm_c_random_bignum (scm_t_rstate *, SCM m); |
| | 72 | |
| | 73 | \f |
| | 74 | /* |
| | 75 | * Scheme level interface |
| | 76 | */ |
| | 77 | SCM_API scm_t_bits scm_tc16_rstate; |
| | 78 | #define SCM_RSTATEP(obj) SCM_SMOB_PREDICATE (scm_tc16_rstate, obj) |
| | 79 | #define SCM_RSTATE(obj) ((scm_t_rstate *) SCM_SMOB_DATA (obj)) |
| | 80 | |
| | 81 | SCM_API unsigned char scm_masktab[256]; |
| | 82 | |
| | 83 | SCM_API SCM scm_var_random_state; |
| | 84 | SCM_API SCM scm_random (SCM n, SCM state); |
| | 85 | SCM_API SCM scm_copy_random_state (SCM state); |
| | 86 | SCM_API SCM scm_seed_to_random_state (SCM seed); |
| | 87 | SCM_API SCM scm_datum_to_random_state (SCM datum); |
| | 88 | SCM_API SCM scm_random_state_to_datum (SCM state); |
| | 89 | SCM_API SCM scm_random_state_from_platform (void); |
| | 90 | SCM_API SCM scm_random_uniform (SCM state); |
| | 91 | SCM_API SCM scm_random_solid_sphere_x (SCM v, SCM state); |
| | 92 | SCM_API SCM scm_random_hollow_sphere_x (SCM v, SCM state); |
| | 93 | SCM_API SCM scm_random_normal (SCM state); |
| | 94 | SCM_API SCM scm_random_normal_vector_x (SCM v, SCM state); |
| | 95 | SCM_API SCM scm_random_exp (SCM state); |
| | 96 | SCM_INTERNAL void scm_init_random (void); |
| | 97 | |
| | 98 | SCM_INTERNAL void scm_i_random_bytes_from_platform (unsigned char *buf, size_t len); |
| | 99 | |
| | 100 | #endif /* SCM_RANDOM_H */ |
| | 101 | |
| | 102 | /* |
| | 103 | Local Variables: |
| | 104 | c-file-style: "gnu" |
| | 105 | End: |
| | 106 | */ |
HCoop / bpt / guile.git / blame_incremental