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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#ifndef _RTE_RANDOM_H_
#define _RTE_RANDOM_H_
/**
* @file
*
* Pseudo-random Generators in RTE
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <stdlib.h>
/**
* Seed the pseudo-random generator.
*
* The generator is automatically seeded by the EAL init with a timer
* value. It may need to be re-seeded by the user with a real random
* value.
*
* @param seedval
* The value of the seed.
*/
static inline void
rte_srand(uint64_t seedval)
{
srand48((long)seedval);
}
/**
* Get a pseudo-random value.
*
* This function generates pseudo-random numbers using the linear
* congruential algorithm and 48-bit integer arithmetic, called twice
* to generate a 64-bit value.
*
* @return
* A pseudo-random value between 0 and (1<<64)-1.
*/
static inline uint64_t
rte_rand(void)
{
uint64_t val;
val = (uint64_t)lrand48();
val <<= 32;
val += (uint64_t)lrand48();
return val;
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_RANDOM_H_ */
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