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Allocate two objects simultaneously in multi-threading

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I'm studying Ruby 1.9.2 source code. Some issues about simultaneity.

Object.new will call following funtion to allocate space from heap:
static VALUE  rb_class_allocate_instance(VALUE klass)
{
    NEWOBJ(obj, struct RObject);
    OBJSETUP(obj, klass, T_OBJECT);
    return (VALUE)obj;
}

#define NEWOBJ(obj,type) type *obj = (type*)rb_newobj()

VALUE
rb_newobj(void)
{
    if (during_gc) {
  dont_gc = 1;
  during_gc = 0;
  rb_bug("object allocation during garbage collection phase");
    }

    return rb_newobj_from_heap(objspace);
}

static VALUE
rb_newobj_from_heap(rb_objspace_t *objspace)
{
    VALUE obj;

    if ((ruby_gc_stress && !ruby_disable_gc_stress) || !freelist) {
  if (!heaps_increment(objspace) && !garbage_collect(objspace)) {
      during_gc = 0;
      rb_memerror();
  }
    }

    obj = (VALUE)freelist;
    freelist = freelist->as.free.next;

    MEMZERO((void*)obj, RVALUE, 1);

    return obj;
}



I doesn’t see any code(in rb_newobj_from_heap), which is to make sure
only one thread can call the function rb_newobj at the same time in
multi-threading.
The issue found in many other places. It seems that there can be only
one thread in Ruby. But class Thread can create another thread.

x = Thread.new {
for a in 1..999
  Object.new
end
}
for b in 1..999
  Object.new
End

Please tell me if some other mechanism solve the simultaneity issue.
Thanks Vince

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Allocate two objects simultaneously in multi-threading "dot c." <dot.cyclone@gmail.com> - 2011-04-26 00:48 -0500
  Re: Allocate two objects simultaneously in multi-threading elise huard <huard.elise@gmail.com> - 2011-04-29 02:27 -0500

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