Threads

}

You  just try, it is not an order. It tries but not always sleeps!

Hi, Is there somebody who can tell me why my thread sleeps longer then I told

him to do...

I have a thread that has to sleep for 60000 millesec. But every 4, 5 minutes

it sleeps for 61000 millesec.? I have to built an application that get the

time every minute, but with this sleep I can t trust the java threads.

So can somebody tell me what is going wrong???

Answer: Really JDK never give you warranty that will wake your thread after XXX

ms.

You can be sure only

that your thread will not be waked up before!

For good timing you should take another, better for real time perfomance, VM.

For example PERC from 

Nemonics.com

 or something else...

I have created a program with a main method that instantiates and starts three

threads, the first two of which are daemons. Why daemons does die when normal

thread die?

Answer:  Because of nature of daemon threads. They are alive if exists at least one

"normal user s" thread. Otherwise they die immediately

 Q: Does anyone know if there is a way for two threads to find each other if they

are started in two different JVM?

In other words, I start a thread in one JVM, then I want to PipeWrite to another

Thread that is doing a PipeReader. Any help would be appreciated!

Answer: Use of Piped streams is only supported inside the same JVM. If you want

IPC, you have to use sockets or xfer data using files. I would recommend the sockets

approach, it has the added advantage of working not only between process, but

across the network as well.

Use of other IPC mechanisms, like shared memory, pipes, mail boxes, etc, are not

supported by the JVM core. You could always roll your own native code, but why

bother when you have access to sockets?

RMI is another possibility but it all depends on what you want to do. I ll let the RMI

experts talk about this option.

And CORBA, if you want to get real fancy.

Joe

 Q: When will a Thread Object be garbage collected?

I would like to ask a question about garbage collection of Thread Object.

When will a Thread Object be garbage collected? 

When the reference count to it becomes zero, or when it enters the "Dead" state, i.e.

the run() member function terminates?

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