20 #if defined(THREAD_DUMMY_IMPL)
23 typedef ThreadDummyImpl ThreadImpl;
25 #elif defined(THREAD_SIMPLE_IMPL)
28 typedef ThreadSimpleImpl ThreadImpl;
30 #elif defined(THREAD_WIN32_IMPL)
33 typedef ThreadWin32Impl ThreadImpl;
35 #elif defined(THREAD_POSIX_IMPL)
38 typedef ThreadPosixImpl ThreadImpl;