CHN_EMPTY
if (!CHN_EMPTY(c, children)) {
if (CHN_EMPTY(c, children))
nrun = CHN_EMPTY(c, children.busy) ? 0 : 1;
if (CHN_EMPTY(c, children.busy)) {
if (snd_verbose > 3 && CHN_EMPTY(c, children))
if (CHN_EMPTY(d, channels.pcm)) { \
while (!CHN_EMPTY(d, channels.pcm))
CHN_EMPTY(c, children) ||
if (!PCM_REGISTERED(d) || CHN_EMPTY(d, channels.pcm))
if (CHN_EMPTY(parent, children))
if (CHN_EMPTY(parent, children)) {