pr_wait
error = pr_wait(pcp, rqtp, timecheck);
error = pr_wait(pcp, rqtp, timecheck);
error = pr_wait(pcp, NULL, 0);
extern int pr_wait(prcommon_t *, timestruc_t *, int);
priv->pr_wait = B_TRUE;
if (priv->pr_wait) {
priv->pr_wait = B_FALSE;
volatile boolean_t pr_wait;