void _sleepOn(Object sleepOn_, String prestate_, String poststate_) {
if (poststate_ == null) poststate_ = state;
sleepOn = sleepOn_;
synchronized (sleepOn) {
if (nextTask != null) _semanticsError("wait()");
aruntime.threadBecomesWaiting(this);
__sleepOn(sleepOn_, prestate_, State_AWAKENING);
// runtime.threadAwakeFromWaiting(this);
if (aruntime.debug && aruntime.isDebugEnabledAt(aruntime.Debug_Q))
aruntime.println(
aruntime.Debug_Q, this, "awaked from indefinite sleep: " + _currentContext());
}
setState(poststate_);
}
