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

[Chris Plummer]

On Thu, 11 Jul 2024 14:09:57 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Sorry I'm unclear on the different threads involved here. IIUC the vm.suspend comes from the debugger, and the mainthread and thread-2 are both threads in the debuggee, being suspended at different times?
>
> 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.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20088#discussion_r1674279814