chore(examples): update exporter.cpp

Author: KowalskiThomas

examples/ffi/exporter.cpp

@@ -135,6 +135,18 @@ int main(int argc, char *argv[]) {
   auto cancel = ddog_CancellationToken_new();
   auto cancel_for_background_thread = ddog_CancellationToken_clone(&cancel);
 
+  // Eagerly initialize the tokio runtime. This is optional, but required
+  // to avoid race conditions if another thread might be using the
+  // the cancellation token at the same time as the profile is being sent
+  // (as is the case here).
+  ddog_VoidResult init_result = ddog_prof_Exporter_init_runtime(exporter);
+  if (init_result.tag != DDOG_VOID_RESULT_OK) {
+    print_error("Failed to initialize exporter runtime: ", init_result.err);
+    ddog_Error_drop(&init_result.err);
+    ddog_prof_Exporter_drop(exporter);
+    return 1;
+  }
+
   // As an example of CancellationToken usage, here we create a background
   // thread that sleeps for some time and then cancels a request early (e.g.
   // before the timeout in ddog_prof_Exporter_send_blocking is hit).