AFAICT, there is not way to do this in helgrind.
BTW, this is a real race in libstdc++ (though a benign one).
In ThreadSanitizer we have to avoid it in a hackish way:
http://code.google.com/p/data-race-test/source/browse/trunk/tsan/thread_sanitizer.cc?spec=svn1930&r=1926#4370
It would be also possible to use a suppression or ignore file with
ThreadSanitizer, but there is a risk to loose a real race on a string.
Hence this hack.
--kcc
On Thu, Apr 1, 2010 at 9:38 AM, Tang, Mingyu <[email protected]> wrote:
> I got lots of helgrind error messages like the following:
>
>
>
> Possible data race during read of size 4 at 0x827de98 by thread #7
>
> at 0xAEFB2E: std::string::append(char const*, unsigned int) (in
> /usr/lib/libstdc++.so.6.0.8)
>
> by 0xAC5E90: std::basic_istream<char, std::char_traits<char> >&
> std::getline<char, std::char_traits<char>, std::allocator<char>
> >(std::basic_istream<char, std::cha
>
> by 0xADF9A7: std::basic_istream<char, std::char_traits<char> >&
> std::getline<char, std::char_traits<char>, std::allocator<char>
> >(std::basic_istream<char, std::cha
>
> …
>
> This conflicts with a previous write of size 4 by thread #8
>
> at 0xAEFF68: std::string::_M_mutate(unsigned int, unsigned int,
> unsigned int) (in /usr/lib/libstdc++.so.6.0.8)
>
> by 0xAF00C9: std::string::_M_replace_safe(unsigned int, unsigned int,
> char const*, unsigned int) (in /usr/lib/libstdc++.so.6.0.8)
>
> by 0xAF0164: std::string::assign(char const*, unsigned int) (in
> /usr/lib/libstdc++.so.6.0.8)
>
> …
>
>
>
> The stack for the first thread varies. However, the stack for the second
> thread remains the same. I would like to build suppression on the stack of
> the second thread. I.e. something like:
>
>
>
> {
>
> std_string_mutate_race
>
> Helgrind:Race
>
> fun:_ZNSs9_M_mutateEjjj
>
> …
>
> }
>
>
>
> This does not work since mutate appears on the call stack of the second
> thread not the first one.
>
> Is there a way to make it work?
>
>
>
> Thanks!
>
>
>
> -- Mingyu
>
>
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
> Valgrind-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/valgrind-users
>
>
------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
_______________________________________________
Valgrind-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/valgrind-users
