Function twz_rt_get_name 

pub unsafe extern "C-unwind" fn twz_rt_get_name(
    tcb: *const c_void,
    name: *mut c_char,
    len: *mut usize,
)

Get the name of the calling thread. A slice of length *len is filled, and *len is updated to contain the length actually used. The result is also a C string.