<Sound Dev> [9] Review Request: 8156169 Some sound tests rarely hangs because of incorrect synchronization

[Phil Race]

+1.

The reason for the change to tracks.toArray() was not obvious
from the code and I understood it only after reading your comment
below. So perhaps you could add a short comment before you push.

-phil.

On 05/17/2016 07:30 AM, Sergey Bylokhov wrote:
> Hello, Audio Guru.
>
> Please review the fix for jdk9.
> While working on some bugs reported by the mach5 project, I found that 
> some of our tests are quite unstable, and the reason was in this(or 
> similar) pattern:
> ....
> clip.start();
> while(clip.isRunning());
> ....
> The status of the clip is run or not is updated on a different thread, 
> but our clip implementation lacks of synchronization of getters and 
> the hotspot inline such methods to while(true). There are some other 
> flags which have the similar issue, I tried to fix all of them in the 
> proposed version of the fix.
>
> Also I propose the small cleanup of Sequence.java
>  - It is not necessary to sync tracks.removeElement() on tracks, 
> because this is synchronized method.
>  - tracks.toArray(new Track[tracks.size()]) should be synchronized on 
> tracks, because the problem can occurs between tracks.size() and 
> tracks.toArray(). But I decided to pass the empty array, so all the 
> work will be done in toArray() which is synchronized method.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8156169
> Webrev can be found at: 
> http://cr.openjdk.java.net/~serb/8156169/webrev.01
>
>