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

[Jiangli Zhou]

On Mon, 13 Nov 2023 06:01:11 GMT, David Holmes <dholmes at openjdk.org> wrote:

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

With @dholmes-ora suggestion above, I think it probably makes sense to also change the flag to `UserThreadWaitAttemptsAtExit`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16591#discussion_r1391785939