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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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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