RFR: 8297295: Remove ThreadGroup.allowThreadSuspension

[Stuart Marks]

On Fri, 25 Nov 2022 18:54:28 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Another small step in the multi-release/multi-year effort to remove cruft from Thread/ThreadGroup.
> 
> java.lang.ThreadGroup.allowThreadSuspension(boolean) dates from JDK 1.1 and the Classic VM. The method controlled whether threads were suspended when the GC failed. It appears to have interacted with a callback mechanism that could potentially free memory, allowing the GC to retry. The method was never specified .
> 
> The method was deprecated and changed to do nothing in JDK 1.2. It was deprecated for removal in Java 14. 
> 
> A corpus analysis of 30M classes in 130k artifacts found 0 usages of this method.
> 
> It is time to finally remove this method. The compatibility impact should be negligible. Joe, Stuart and I discussed briefly and think early in JDK 21 is a good time to do this.

Marked as reviewed by smarks (Reviewer).

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PR: https://git.openjdk.org/jdk/pull/11373