turnstile_lookup
ts = turnstile_lookup(lp);
ts = turnstile_lookup(lp);
turnstile_t *ts = turnstile_lookup(lp);
ts = turnstile_lookup(lp);
ts = turnstile_lookup(lp);
turnstile_t *ts = turnstile_lookup(lp);
extern turnstile_t *turnstile_lookup(void *);
ts = turnstile_lookup(upimutex);
ts = turnstile_lookup((upimutex_t *)upimutex);