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107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/*
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* Copyright (C) 2013 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup sys_random Random
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* @ingroup sys
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* @brief Random number generator
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* @{
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*
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* @file
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* @brief Mersenne Twister - a very fast random number generator
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*/
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#ifndef RANDOM_H
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#define RANDOM_H
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#include <inttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef PRNG_FLOAT
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# define PRNG_FLOAT (0)
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#endif
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/**
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* @brief initializes mt[N] with a seed
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*
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* @param s seed for the PRNG
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*/
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void genrand_init(uint32_t s);
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/**
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* @brief initialize by an array with array-length
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* init_key is the array for initializing keys
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* key_length is its length
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* slight change for C++, 2004/2/26
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*
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* @param init_key array of keys (seeds) to initialize the PRNG
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* @param key_length number of lements in init_key
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*/
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void genrand_init_by_array(uint32_t init_key[], int key_length);
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/**
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* @brief generates a random number on [0,0xffffffff]-interval
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* @return a random number on [0,0xffffffff]-interval
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*/
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uint32_t genrand_uint32(void);
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/**
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* @brief generates a random number r with a <= r < b.
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*
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* @param[in] a minimum for random number
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* @param[in] b upper bound for random number
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*
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* @pre a < b
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*
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* @return a random number on [a,b)-interval
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*/
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static inline uint32_t genrand_uint32_range(uint32_t a, uint32_t b)
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{
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return (genrand_uint32() % (b - a)) + a;
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}
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#if PRNG_FLOAT
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/* These real versions are due to Isaku Wada, 2002/01/09 added */
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/**
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* @brief generates a random number on [0,1)-real-interval
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* @return a random number on [0,1)-real-interval
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*/
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double genrand_real(void);
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/**
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* @brief generates a random number on [0,1]-real-interval
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* @return a random number on [0,1]-real-interval
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*/
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double genrand_real_inclusive(void);
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/**
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* @brief generates a random number on (0,1)-real-interval
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* @return a random number on (0,1)-real-interval
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*/
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double genrand_real_exclusive(void);
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/**
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* @brief generates a random number on [0,1) with 53-bit resolution
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* @return a random number on [0,1) with 53-bit resolution
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*/
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double genrand_res53(void);
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#endif /* PRNG_FLOAT */
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#ifdef __cplusplus
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}
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#endif
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#endif /* RANDOM_H */
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/** @} */
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