_srand_r()

int __srand_r(struct _rand_state * buffer, unsigned int seed);

where:

This function enables you to explicitly supply your own buffer that can be used for thread-local storage.

If _srand_r() is repeatedly called with the same seed value, the same sequence of pseudo-random numbers is repeated. If _rand_r() is called before any calls to _srand_r() have been made with the same buffer, undefined behavior occurs because the buffer is not initialized.