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Diffstat (limited to 'lib/librte_eal/common/include/rte_random.h')
-rw-r--r-- | lib/librte_eal/common/include/rte_random.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/lib/librte_eal/common/include/rte_random.h b/lib/librte_eal/common/include/rte_random.h new file mode 100644 index 0000000000..a86906f370 --- /dev/null +++ b/lib/librte_eal/common/include/rte_random.h @@ -0,0 +1,93 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2012 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. + * + * version: DPDK.L.1.2.3-3 + */ + +#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 unsigned int)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 = lrand48(); + val <<= 32; + val += lrand48(); + return val; +} + +#ifdef __cplusplus +} +#endif + + +#endif /* _RTE_PER_LCORE_H_ */ |