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Re: [PATCH] Add working-set size and hotness information to fdo summary (issue6465057)
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 <andi@firstfloor.org> wrote:
> Xinliang David Li <davidxl@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