renamed:    lib/Makefile -> sxisock/lib/Makefile
	renamed:    lib/sxi_ring.c -> sxisock/lib/sxi_ring.c
	renamed:    lib/sxi_ring.h -> sxisock/lib/sxi_ring.h
	modified:   test/eventfd_test.c

  --
  adjust dir, and test eventfd sample
	modified:   test/Makefile
	new file:   test/cond_signal.c

  add cond signal sample