Is it thread safe? about eigenrand HOT 2 CLOSED

Hi @bab2min thanks for your kind reply and suggestions! Yeah I figured that it will likely be not thread-safe, and I'm just mostly interested in whether constructing multiple Vmt19937_64 in different threads at approximately the same time would result in distinct random seed or not (I had tested it a bit and it seems to be ok but just wondering if it is guaranteed to work in general). I will use your recommendation of std::random_device as seed in different thread, thanks:)

from eigenrand.

Hi @soraxas
No, a random number generator of EigenRand is not thread-safe. You should not share the same instance across threads, but construct an instance of Vmt19937_64 for each thread.
Since the default constructor of Vmt19937_64 use a fixed default seed, you initialize them ​with different seeds if you want to produce different random number across thread. I recommend use std::random_device{}() as the seed for each thread's Vmt19937_64.

from eigenrand.