End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Thread.main

Thread.main → thread

static VALUE
rb_thread_s_main(VALUE klass)
{
    return rb_thread_main();
}

Returns the main thread.

See also .list .new .kill .pass also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0