RFR: 8314243: Make VM_Exit::wait_for_threads_in_native_to_block wait for user threads time configurable

[David Holmes]

On Thu, 9 Nov 2023 23:27:24 GMT, Jiangli Zhou <jiangli at openjdk.org> wrote:

> CSR: https://bugs.openjdk.org/browse/JDK-8314305

Changes requested by dholmes (Reviewer).

src/hotspot/share/runtime/globals.hpp line 841:

> 839:           "Maximum delay in milliseconds at exit waiting for user threads " \
> 840:           "in native")                                                      \
> 841:           range(0, max_intx)                                                \

Given we are going to calculate the actual delay in 10ms chunks, then maybe this should be expressed as the number of 10ms chunks to wait? Otherwise 0-9 -> 0; 10-19->10; 20-29->20 etc.

And maybe we should limit the max to something big but sensible - like 10 seconds?

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PR Review: https://git.openjdk.org/jdk/pull/16591#pullrequestreview-1726585091
PR Review Comment: https://git.openjdk.org/jdk/pull/16591#discussion_r1390651976