Dear all
First sorry to send question off this list.
Can anyone explain in following example why just after 3000 milisecond,
synchronized(this){} within myfunc() can't regain Lock ?
(Compile and try, Actually only after while( i <70) {} completes ,
synchronized(this){} within myfunc() regains lock!)
-------------------------
import java.io.*;
public class Wait{
void myfunc() throws
IOException,InterruptedIOException,InterruptedException
{
TimedGetConnection aTimedGetConnection=new TimedGetConnection(this);
synchronized(this){
System.err.println( "Now ,aTimedGetConnection.start()" );
aTimedGetConnection.start();
try{
System.err.println( "[myfunc()]Now ,before wait(3000)" );
wait(3000);
System.err.println( "[myfunc()]Now ,after wait(3000)" );
}catch(InterruptedException IE){
IE.printStackTrace();
throw IE;
}
System.err.println( "[TimedGetDataInputStream()]Now ,check
Connection!" );
if(!aTimedGetConnection.isGot()){
if(aTimedGetConnection.isError() )
throw aTimedGetConnection.getException();
else
throw new InterruptedIOException("Could not get response for "
+ 3000 + " milliseconds");
}
}
}
public static void main(String[] args){
Wait aa=new Wait();
try{
aa.myfunc();
}catch(Exception e){}
}
}
class TimedGetConnection extends Thread
{
InputStream aInputStream;
Object lock;
private IOException m_exception = null;
public TimedGetConnection(Object lock){
this.lock=lock;
// start();
}
public boolean isGot()
{
if (aInputStream == null)
return false;
else
return true;
}
public void run(){
synchronized(lock){
try{
System.err.println( "[TimedGetConnection]within run(), now call
getInputStream()" );
int i=0;
while( i <70){
sleep(100);
i++;
System.err.println( "[TimedGetConnection]within run(),
i=>"+i );
}
throw new Exception("TestError");
}catch ( Exception ioe ) {
return;
}
}
}
public boolean isError(){
if(m_exception==null) return false;
else return true;
}
public IOException getException()
{
return m_exception;
}
}
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