Check if workerthread could be spawned

src/cpp/thread_manager/thread_manager.cc

@@ -34,15 +34,28 @@ ThreadManager::WorkerThread::WorkerThread(ThreadManager* thd_mgr)
   thd_ = grpc_core::Thread(
       "grpcpp_sync_server",
       [](void* th) { static_cast<ThreadManager::WorkerThread*>(th)->Run(); },
-      this);
+      this,
+      &created_
+      );
+  if (!created_) {
+    gpr_log(GPR_ERROR,
+            "Could not create grpc_sync_server worker-thread"
+            );
+  } else {
     thd_.Start();
   }
+}
 
 void ThreadManager::WorkerThread::Run() {
   thd_mgr_->MainWorkLoop();
   thd_mgr_->MarkAsCompleted(this);
 }
 
+
+bool ThreadManager::WorkerThread::isCreated() {
+  return created_;
+}
+
 ThreadManager::WorkerThread::~WorkerThread() {
   // Don't join until the thread is fully constructed.
   thd_.Join();
@@ -177,7 +190,12 @@ void ThreadManager::MainWorkLoop() {
             }
             // Drop lock before spawning thread to avoid contention
             lock.Unlock();
-            new WorkerThread(this);
+            WorkerThread* w = new WorkerThread(this);
+            if (!w->isCreated()) {
+              num_pollers_--;
+              num_threads_--;
+              resource_exhausted = true;
+            }
           } else if (num_pollers_ > 0) {
             // There is still at least some thread polling, so we can go on
             // even though we are below the number of pollers that we would

src/cpp/thread_manager/thread_manager.h

@@ -124,6 +124,7 @@ class ThreadManager {
     WorkerThread(ThreadManager* thd_mgr);
     ~WorkerThread();
 
+    bool isCreated();
    private:
     // Calls thd_mgr_->MainWorkLoop() and once that completes, calls
     // thd_mgr_>MarkAsCompleted(this) to mark the thread as completed
@@ -131,6 +132,7 @@ class ThreadManager {
 
     ThreadManager* const thd_mgr_;
     grpc_core::Thread thd_;
+    bool created_;
   };
 
   // The main function in ThreadManager