epoch_call
epoch_call(INPUT_EPOCH, hidbus_ivar_dtor, &tlc->epoch_ctx);
epoch_call(epoch, &epoch_drain_cb, &er->er_drain_ctx);
#define NET_EPOCH_CALL(f, c) epoch_call(net_epoch_preempt, (f), (c))
void epoch_call(epoch_t epoch, epoch_callback_t cb, epoch_context_t ctx);