sum_long_running method
A longer lived native function, which occupies the thread calling it.
Do not call these kind of native functions in the main isolate. They will block Dart execution. This will cause dropped frames in Flutter applications. Instead, call these native functions on a separate isolate.
Implementation
int sum_long_running(
int a,
int b,
) {
return _sum_long_running(
a,
b,
);
}