[Lldb-commits] [lldb] [lldb] Implement basic support for reverse-continue (PR #112079)

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jimingham wrote:

We have another negotiation among the threads that want to run with other threads suspended.  We let all the threads that want to run with others suspended go in a round robin and only when there are none of those left do we let the "run all threads" plans do their thing.

Maybe there's a similar principle we can come up with here.  Let all the backwards running threads run till they are done and then make forward progress.  Then to handle things like "forward execution of a function call plan while backwards execution" by having thread plans have an "actual run direction" - which is "forward" or "backwards" and a "run intention" - which is "forward", "backwards" or "no opinion".  If a plan has no intention, then we query its parent.  When we're querying the threads to see who is forward going and who backwards, we'd use the "run intention".  Function calling thread plans would have "no intention" so they wouldn't move their "backwards" running threads into the forward camp...

https://github.com/llvm/llvm-project/pull/112079