[lldb-dev] Race condition in lldb-mi

Abid, Hafiz Hafiz_Abid at mentor.com
Fri Mar 13 10:30:59 PDT 2015

Hi Greg,
I have been trying to track down some race condition in lldb-mi which causes tests to fails randomly on buildbots. It seems that problems occurs due to the stop at entry breakpoint. LLDB-mi gets its notification and its starts getting information about frame. But the target has run again and lldb-mi may end up creating a garbage stack frame which persists because lldb clears frame in resume. When it stops at the real breakpoint (say at main), it ends up showing the same garbage stack frame. I tried to look into normal lldb to see how it deal with the entry breakpoint and it seems that GetRestartedFromEvent() does some magic.

I put the following code in the lldb-mi event handler and the problem seems to go away. 
    if (lldb::SBProcess::GetRestartedFromEvent (vEvent))
        return true;

But I am not sure what GetRestartedFromEvent() actually means. What will be the best way to ignore the event that comes when entry breakpoint is hit?


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