[ThreadPool] Solve thread transitions issue

src/runtime/thread_pool.cc

@@ -283,6 +283,10 @@ class ThreadPool {
       // The SpscTaskQueue only hosts ONE item at a time
       queues_.emplace_back(std::unique_ptr<SpscTaskQueue>(new SpscTaskQueue()));
     }
+    const char* exclude_worker0 = getenv("TVM_EXCLUDE_WORKER0");
+    if (exclude_worker0 && atoi(exclude_worker0) == 1) {
+      exclude_worker0_ = true;
+    }
     threads_ = std::unique_ptr<tvm::runtime::threading::ThreadGroup>(
         new tvm::runtime::threading::ThreadGroup(
           num_workers_, [this](int worker_id) { this->RunWorker(worker_id); },
@@ -370,11 +374,7 @@ class ThreadPool {
   // number of workers used (can be restricted with affinity pref)
   int num_workers_used_;
   // if excluding worker 0 and using master to run task 0
-#ifndef _LIBCPP_SGX_CONFIG
-  bool exclude_worker0_{true};
-#else
   bool exclude_worker0_{false};
-#endif
   std::vector<std::unique_ptr<SpscTaskQueue> > queues_;
   std::unique_ptr<tvm::runtime::threading::ThreadGroup> threads_;
 };