d3db77d7d8
GCC 8.1 warns:
In function 'rte_srand':
rte_random.h:34:10:
warning: conversion to 'long int' from 'long unsigned int'
may change the sign of the result [-Wsign-conversion]
srand48((long unsigned int)seedval);
rte_random.h:51:8:
warning: conversion to 'uint64_t' {aka 'long unsigned int'}
from 'long int' may change the sign of the result
[-Wsign-conversion]
val = lrand48();
^~~~~~~
rte_random.h:53:6:
warning: conversion to 'long unsigned int' from 'long int'
may change the sign of the result [-Wsign-conversion]
val += lrand48();
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Andy Green <andy@warmcat.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
63 lines
1.0 KiB
C
63 lines
1.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#ifndef _RTE_RANDOM_H_
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#define _RTE_RANDOM_H_
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/**
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* @file
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*
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* Pseudo-random Generators in RTE
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdlib.h>
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/**
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* Seed the pseudo-random generator.
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*
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* The generator is automatically seeded by the EAL init with a timer
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* value. It may need to be re-seeded by the user with a real random
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* value.
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*
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* @param seedval
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* The value of the seed.
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*/
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static inline void
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rte_srand(uint64_t seedval)
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{
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srand48((long)seedval);
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}
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/**
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* Get a pseudo-random value.
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*
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* This function generates pseudo-random numbers using the linear
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* congruential algorithm and 48-bit integer arithmetic, called twice
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* to generate a 64-bit value.
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*
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* @return
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* A pseudo-random value between 0 and (1<<64)-1.
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*/
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static inline uint64_t
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rte_rand(void)
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{
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uint64_t val;
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val = (uint64_t)lrand48();
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val <<= 32;
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val += (uint64_t)lrand48();
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return val;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RTE_RANDOM_H_ */
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