RFR: 6907252: ZipFileInputStream Not Thread-Safe

[Xueming Shen]

On 10/14/15 6:20 AM, Seán Coffey wrote:
> Looking to tighten up access between the java and native level zip 
> library calls. This extra check should ensure that we don't hit SEGV 
> on thread races.
>
> I've also taken the opportunity to make the ZStreamRef address 
> variable volatile. I'm still getting reports of zip crashes in the 
> deflate, deflate_slow functions [1] but can't reproduce the failure. 
> Access to the ZStreamRef address variable seems to be synchronized 
> correctly in all calling sites. I'm just be extra sure for possible 
> sharing across multiple threads.
>
> bug report : https://bugs.openjdk.java.net/browse/JDK-6907252
> webrev : http://cr.openjdk.java.net/~coffeys/webrev.6907252/webrev/
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8028216
>
looks good for me.

-sherman