How Can I Improve Seed Generation for Random Number Generation in C ?

Innovative Approach to Seed Generation for Random Number Generation in C

In C , the initialization of the pseudo-random number generator (PRNG) using srand is crucial for ensuring random-like behavior. This article explores an alternative technique for seed generation, primarily targeting Linux hosts.

The article suggests initializing srand with a distinctive value, such as the timestamp from time(), as it varies each second. However, for applications that run multiple times a second, this method is insufficient. To address this issue, the author recommends a combination of system attributes:

unsigned long seed = mix(clock(), time(NULL), getpid());

Here, mix is a custom function that combines multiple integer inputs into a single output. This approach enables a more robust and portable initialization strategy. The mix function employs Robert Jenkins' 96-bit mixing function, which ensures proper randomization:

unsigned long mix(unsigned long a, unsigned long b, unsigned long c)
{
    // ...
}

By combining these attributes, the generated seed is both unique and portable, addressing the concerns of both distinctiveness and portability. This innovative approach provides a reliable method for initializing the PRNG in C applications, particularly those that require high-quality random number generation.

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