turnstile_block
(void) turnstile_block(ts, TS_WRITER_Q, lp,
(void) turnstile_block(ts, TS_READER_Q, lp,
(void) turnstile_block(ts, TS_WRITER_Q, lp,
extern int turnstile_block(turnstile_t *, int, void *, struct _sobj_ops *,
error = turnstile_block(ts, TS_WRITER_Q, (upimutex_t *)upimutex,