Merge branch 'infinite_stream' into epex4

test/cpp/qps/client_sync.cc

@@ -153,7 +153,9 @@ class SynchronousStreamingClient final : public SynchronousClient {
     StartThreads(num_threads_);
   }
   ~SynchronousStreamingClient() {
+    std::vector<std::thread> cleanup_threads;
     for (size_t i = 0; i < num_threads_; i++) {
+      cleanup_threads.emplace_back([this, i]() {
         auto stream = &stream_[i];
         if (*stream) {
           (*stream)->WritesDone();
@@ -163,6 +165,10 @@ class SynchronousStreamingClient final : public SynchronousClient {
                     s.error_message().c_str());
           }
         }
+      });
+    }
+    for (size_t i=0; i<num_threads_; i++) {
+      cleanup_threads[i].join();
     }
   }
 
@@ -179,6 +185,8 @@ class SynchronousStreamingClient final : public SynchronousClient {
       if ((messages_per_stream_ != 0) &&
           (++messages_issued_[thread_idx] < messages_per_stream_)) {
         return true;
+      } else if (messages_per_stream_ == 0) {
+        return true;
       } else {
         // Fall through to the below resetting code after finish
       }