int Serial::_putc(int c) { return _base_putc(c); }
int RawSerial::putc(int c) { return _base_putc(c); }
int RawSerial::putc(int c) { lock(); int ret = _base_putc(c); unlock(); return ret; }
int Serial::_putc(int c) { // Mutex is already held return _base_putc(c); }