ts_free
ASSERT(ts->ts_free == NULL);
static void ts_free(void *);
ts_free,
ts_free,
myts->ts_free = ts->ts_free;
ts->ts_free = myts;
if ((tsfree = ts->ts_free) != NULL) {
ts->ts_free = tsfree->ts_free;
tsfree->ts_free = NULL;
turnstile_t *ts_free; /* next on freelist */