func: void qemu_mutex_lock_iothread(void)
  
  {
  
      if (!tcg_enabled()) {
  
          qemu_mutex_lock(&qemu_global_mutex);
  
      } else {
  
          iothread_requesting_mutex = true;
  
          if (qemu_mutex_trylock(&qemu_global_mutex)) {
  
              qemu_cpu_kick_thread(first_cpu);
  
              qemu_mutex_lock(&qemu_global_mutex);
  
          }
  
          iothread_requesting_mutex = false;
  
          qemu_cond_broadcast(&qemu_io_proceeded_cond);
  
      }
  
  }
  