25   DCHECK(HasBeenStarted()) << "SimpleThread was never started.";  in ~SimpleThread()
26   DCHECK(!options_.joinable || HasBeenJoined())  in ~SimpleThread()
37   DCHECK(options_.joinable) << "A non-joinable thread can't be joined.";  in Join()
38   DCHECK(HasStartBeenAttempted()) << "Tried to Join a never-started thread.";  in Join()
39   DCHECK(!HasBeenJoined()) << "Tried to Join a thread multiple times.";  in Join()
47   DCHECK(!HasStartBeenAttempted()) << "Tried to Start a thread multiple times.";  in StartAsync()
60   DCHECK(HasBeenStarted());  in tid()
93   DCHECK(delegate_);  in DelegateSimpleThread()
99   DCHECK(delegate_) << "Tried to call Run without a delegate (called twice?)";  in Run()
117   DCHECK(threads_.empty());  in ~DelegateSimpleThreadPool()
118   DCHECK(delegates_.empty());  in ~DelegateSimpleThreadPool()
119   DCHECK(!dry_.IsSignaled());  in ~DelegateSimpleThreadPool()
123   DCHECK(threads_.empty()) << "Start() called with outstanding threads.";  in Start()
132   DCHECK(!threads_.empty()) << "JoinAll() called with no outstanding threads.";  in JoinAll()
143   DCHECK(delegates_.empty());  in JoinAll()
165       DCHECK(!delegates_.empty());  in Run()