397                         Priority pri = LOW, void* tag = nullptr,
460   virtual void SetBackgroundThreads(int number, Priority pri = LOW) = 0;
461   virtual int GetBackgroundThreads(Priority pri = LOW) = 0;
470   virtual void IncBackgroundThreadsIfNeeded(int number, Priority pri) = 0;
805   virtual void SetIOPriority(Env::IOPriority pri) { io_priority_ = pri; }  in SetIOPriority()  argument
1288   void Schedule(void (*f)(void* arg), void* a, Priority pri,
1290     return target_->Schedule(f, a, pri, tag, u);
1293   int UnSchedule(void* tag, Priority pri) override {  in UnSchedule()  argument
1294     return target_->UnSchedule(tag, pri);  in UnSchedule()
1301   unsigned int GetThreadPoolQueueLen(Priority pri = LOW) const override {
1302     return target_->GetThreadPoolQueueLen(pri);
1328   void SetBackgroundThreads(int num, Priority pri) override {  in SetBackgroundThreads()  argument
1329     return target_->SetBackgroundThreads(num, pri);  in SetBackgroundThreads()
1331   int GetBackgroundThreads(Priority pri) override {  in GetBackgroundThreads()  argument
1332     return target_->GetBackgroundThreads(pri);  in GetBackgroundThreads()
1339   void IncBackgroundThreadsIfNeeded(int num, Priority pri) override {  in IncBackgroundThreadsIfNeeded()  argument
1340     return target_->IncBackgroundThreadsIfNeeded(num, pri);  in IncBackgroundThreadsIfNeeded()
1481   void SetIOPriority(Env::IOPriority pri) override {  in SetIOPriority()  argument
1482     target_->SetIOPriority(pri);  in SetIOPriority()