192 bool __libcpp_thread_isnull(const __libcpp_thread_t *__t) {  in __libcpp_thread_isnull()  argument
193   return *__t == 0;  in __libcpp_thread_isnull()
196 int __libcpp_thread_create(__libcpp_thread_t *__t, void *(*__func)(void *),  in __libcpp_thread_create()  argument
203   *__t = reinterpret_cast<HANDLE>(_beginthreadex(nullptr, 0,  in __libcpp_thread_create()
207   if (*__t)  in __libcpp_thread_create()
217 __libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t)  in __libcpp_thread_get_id()  argument
219   return GetThreadId(*__t);  in __libcpp_thread_get_id()
222 int __libcpp_thread_join(__libcpp_thread_t *__t)  in __libcpp_thread_join()  argument
224   if (WaitForSingleObjectEx(*__t, INFINITE, FALSE) == WAIT_FAILED)  in __libcpp_thread_join()
226   if (!CloseHandle(*__t))  in __libcpp_thread_join()
231 int __libcpp_thread_detach(__libcpp_thread_t *__t)  in __libcpp_thread_detach()  argument
233   if (!CloseHandle(*__t))  in __libcpp_thread_detach()