152   std::unique_lock<std::mutex> lock(mu_);  in JoinThreads()  local
161   lock.unlock();  in JoinThreads()
177   std::lock_guard<std::mutex> lock(mu_);  in LowerIOPriority()  local
183   std::lock_guard<std::mutex> lock(mu_);  in LowerCPUPriority()  local
193     std::unique_lock<std::mutex> lock(mu_);  in BGThread()  local
197       bgsignal_.wait(lock);  in BGThread()
231     lock.unlock();  in BGThread()
316   std::lock_guard<std::mutex> lock(mu_);  in SetBackgroundThreadsInternal()  local
329   std::unique_lock<std::mutex> lock(mu_);  in GetBackgroundThreads()  local
361   std::lock_guard<std::mutex> lock(mu_);  in Submit()  local
395     std::lock_guard<std::mutex> lock(mu_);  in UnSchedule()  local