#ifdef HAVE_TRACING
void SIMIX_set_category(smx_action_t action, const char *category)
{
+ if (action->state != SIMIX_RUNNING) return;
if (action->type == SIMIX_ACTION_EXECUTE){
surf_workstation_model->set_category(action->execution.surf_exec, category);
}else if (action->type == SIMIX_ACTION_COMMUNICATE){