214       sink_(nullptr),  in Win32Socket()
254   if (sink_)  in SetTimeout()
255     ::SetTimer(sink_->handle(), 1, ms, 0);  in SetTimeout()
313   if (!sink_) {  in Connect()
319   dns->handle = WSAAsyncGetHostByName(sink_->handle(), WM_DNSNOTIFY,  in Connect()
493   if (sink_) {  in Close()
494     sink_->Dispose();  in Close()
495     sink_ = nullptr;  in Close()
503   RTC_DCHECK(nullptr == sink_);  in CreateSink()
506   sink_ = new EventSink(this);  in CreateSink()
507   sink_->Create(nullptr, L"EventSink", 0, 0, 0, 0, 10, 10);  in CreateSink()
511   if (nullptr == sink_) {  in SetAsync()
513     RTC_DCHECK(nullptr != sink_);  in SetAsync()
517   if (WSAAsyncSelect(socket_, sink_->handle(), WM_SOCKETNOTIFY, events) ==  in SetAsync()
539   ::PostMessage(sink_->handle(), WM_SOCKETNOTIFY, socket_,  in PostClosed()