static int
docvwait(kcondvar_t *cv, kmutex_t *mtx, struct timespec *ts)
{
struct lwp *l = curlwp;
int rv;
if (__predict_false(l->l_flag & LW_RUMP_QEXIT)) {
/*
* yield() here, someone might want the cpu
* to set a condition. otherwise we'll just
* loop forever.
*/
yield();
return EINTR;
}
UNLOCKED(mtx, false);
l->l_private = cv;
rv = 0;
if (ts) {
if (rumpuser_cv_timedwait(RUMPCV(cv), RUMPMTX(mtx),
ts->tv_sec, ts->tv_nsec))
rv = EWOULDBLOCK;
} else {
rumpuser_cv_wait(RUMPCV(cv), RUMPMTX(mtx));
}
LOCKED(mtx, false);
/*
* Check for QEXIT. if so, we need to wait here until we
* are allowed to exit.
*/
if (__predict_false(l->l_flag & LW_RUMP_QEXIT)) {
struct proc *p = l->l_proc;
UNLOCKED(mtx, false);
mutex_exit(mtx); /* drop and retake later */
mutex_enter(p->p_lock);
while ((p->p_sflag & PS_RUMP_LWPEXIT) == 0) {
/* avoid recursion */
rumpuser_cv_wait(RUMPCV(&p->p_waitcv),
RUMPMTX(p->p_lock));
}
KASSERT(p->p_sflag & PS_RUMP_LWPEXIT);
mutex_exit(p->p_lock);
/* ok, we can exit and remove "reference" to l->private */
mutex_enter(mtx);
LOCKED(mtx, false);
rv = EINTR;
}
l->l_private = NULL;
return rv;
}
int
rump_schedlock_cv_timedwait(struct rumpuser_cv *cv, const struct timespec *ts)
{
struct lwp *l = curlwp;
struct rumpcpu *rcpu = cpuinfo_to_rumpcpu(l->l_cpu);
/* mutex will be taken and released in cpu schedule/unschedule */
return rumpuser_cv_timedwait(cv, rcpu->rcpu_mtx,
ts->tv_sec, ts->tv_nsec);
}
int
cv_timedwait(kcondvar_t *cv, kmutex_t *mtx, int ticks)
{
#ifdef DIAGNOSTIC
extern int hz;
#endif
if (ticks == 0) {
cv_wait(cv, mtx);
return 0;
} else {
KASSERT(hz == 100);
return rumpuser_cv_timedwait(RUMPCV(cv), mtx->kmtx_mtx, ticks);
}
}