added (passing) tests for the "coroutine status" of user threads.
added (passing) tests for the "coroutine status" of user threads.

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx