[8u] RFR (S) 8223177: Data race on JvmtiEnvBase::_tag_map in double-checked locking

[serguei.spitsyn at oracle.com]

Hi Aleksey,

The backport looks good.

Thanks,
Serguei


On 8/7/19 03:53, Aleksey Shipilev wrote:
> Original bug:
>    https://bugs.openjdk.java.net/browse/JDK-8223177
>    https://hg.openjdk.java.net/jdk/jdk/rev/27c8a2e0b0e5
>
> This patch applies to 8u, but does not compile, because regular OrderAccess methods do not accept
> pointers. We need to use the *_ptr_* versions of the same methods and do casts from void*.
>
> 8u webrev:
>    http://cr.openjdk.java.net/~shade/8223177/webrev.8u.01/
>
> Testing: tier1
>