[android-developers] Re: Manulaly reset event on Android

This is trivial to do with Java. (I say "trivial" in the sense of how
simple the technique is. Knowing how to properly use ANY thread
synchronization, even trivial ones, is hard...).

Here's a rough sketch. It's been a long time since I've used the
windows Event object, and I'm just typing in the Java off the top of
my head. So take this rough explanation, not worked out code example,
please.

class WindowsEvent {
private boolean signaled = false;
public synchronized void signal() {
signaled = true;
notifyAll(); // I forget the Event behavior -- notify() might e
correct instead?
}

public synchronized void reset() {
signaled = false;
}

public synchronized void waitOnEvent() {
while (! signaled) {
wait();
try {
} catch (InterruptedException ex) {
}
}
}
}

On Jun 10, 5:11 am, ls02 <agal...@audible.com> wrote:
> I looked at both of them and I don't think either of them work as
> manually reset event. Semaphore and lock ussualy have matching lock
> and unlock called from the same thread, they do not provide way for
> another thread to unlock the thread waiting on object. Basic Java
> Object sync works fine but it does not seem to allow to manully reset
> object state to signaled or non-signaled.
>
> On Jun 10, 7:35 am, Mark Murphy <mmur...@commonsware.com> wrote:
>
>
>
> > ls02 wrote:
> > > Is there sync object on android similar to manually reset event on
> > > Windows?
>
> > > It must have signaled and non-signaled state both set manually. A
> > > thread must be able to wait on it and wait would return immediately if
> > > the object is in signaled state and block if it is in non signaled
> > > state until another thread sets it to signaled state. There must be
> > > way to reset the object back to non-signaled state.
>
> > Off the cuff, that sounds like java.util.concurrent.Semaphore, or
> > perhaps java.util.concurrent.locks.ReentrantLock.
>
> > You might wish to take a look at _Java Concurrency in Practice_, as your
> > questions have little to do with Android and everything to do with Java:
>
> >http://amzn.to/baqNfl
>
> > --
> > Mark Murphy (a Commons Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
>
> > Warescription: Three Android Books, Plus Updates, One Low Price!

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