I was mistaken here -- gcov_open actually uses locking via fcntl interface -- so we do need to find a way to solve the summary update synchronization problem when it is separate out of the per-file update loop.
David On Mon, Aug 20, 2012 at 12:03 PM, Andi Kleen <a...@firstfloor.org> wrote: > Xinliang David Li <davi...@google.com> writes: >> >> Process level synchronization problems can happen when two processes >> (running the instrumented binary) exit at the same time. The >> updated/merged counters from one process may be overwritten by another >> process -- this is true for both counter data and summary data. >> Solution 3) does not introduce any new problems. > > You could just use lockf() ? > > -Andi
