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From: "phma at bezitopo dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug threads/27618] New: Ignore breakpoints in other threads while
 debugging one thread
Date: Sun, 21 Mar 2021 01:42:37 +0000
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X-Bugzilla-Version: 9.2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27618

            Bug ID: 27618
           Summary: Ignore breakpoints in other threads while debugging
                    one thread
           Product: gdb
           Version: 9.2
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: threads
          Assignee: unassigned at sourceware dot org
          Reporter: phma at bezitopo dot org
  Target Milestone: ---

I'd like to ignore breakpoints in other threads once a breakpoint has tripp=
ed
in one thread.

I was debugging a multithreaded program and set a breakpoint in the triop
function. One of the threads hit the breakpoint, and I started stepping thr=
ough
it. Then another thread hit the same breakpoint. I then set scheduler-locki=
ng
so that only one thread would run. triop first locks one triangle, checks
whether the triangle should be split, then locks several triangles before
splitting the triangle. Unfortunately, another thread was in the middle of =
the
locking routine, so when it tried to lock triangles (the other threads being
stopped), it hung.

If I could step through a function while other threads could also run the
function without tripping the breakpoint and jerking me into the other thre=
ad,
it would be easier for me to see what the function is doing.

I ended up telling the program to use only one worker thread (not a problem
timewise, as the file that triggered the bug is tiny) and found and fixed t=
he
bug.

--=20
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