John Keiser wrote:
>
> On 21 Aug 2001 13:47:50 +0200, Dalibor Topic wrote:
> > public class WaitingPushbackInputStream extends PushbackInputStream {
> > [...]
> > public int read() throws IOException {
> > synchronized(this) {
> > synchronized(in) {
> > while(0 == available()) {
> > try {
> > wait();
> > }
> > catch (InterruptedException e) {
> > // ignore
> > }
> > }
> >
> > // something is available for reading,
> > // and we've got both locks. this read
> > // should not block at all.
> > return super.read();
> > }
> > }
> > }
> >
> > public void unread(int oneByte) throws IOException {
> > synchronized(this) {
> > notifyAll();
> > super.unread(oneByte);
> > }
> > }
> > }
> That's some nice code. But how could super.unread() ever get called if
> read() is in its loop? They're both synchronized on this.
AIUI, wait() causes all monitors to be temporarily released. So a call
to unread() will go through as soon as read() hits the line that says
wait().
But ICBVW...
Stuart.
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