RFR: 8072701: resume001 failed due to ERROR: timeout for waiting for a BreakpintEvent [v2]

[Alex Menkov]

On Thu, 11 Jul 2024 15:58:13 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Yes. thread2 is suspended via breakpoint (multiple times). mainThread is suspended by the one place in the test that does a vm.suspend(), which is near the end of the test. This is the problematic suspend because sometimes it is done while mainThread is in the middle of a println. A bit later thread2 is resumed and ends up blocking on a println due to mainThread holding the needed lock.
>
> I've updated the implementation so now it does a sync point after mainThread is done with printlns.

> Which logging should be removed? Alex suggest the logging between breakpoints 2 and 3, but even that is not enough. There is logging after breakpoint 3, and that happens before the vm.resume() is done.

After breakpoint 3 debugger calls thread2.resume() and vm.resume(), so there is no issue there (all threads are resumed).

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PR Review Comment: https://git.openjdk.org/jdk/pull/20088#discussion_r1674512891