gh-150907: Fix dynamic_annotations.h when built with C++ and Valgrind (GH-150914)
Add extern "C++" scope for the C++ template.
Fix test_cppext when Python is built with --with-valgrind.
(cherry picked from commit c32501261a)
Co-authored-by: Victor Stinner <vstinner@python.org>
http://code.google.com/p/data-race-test/wiki/ThreadSanitizer is a dynamic data
race detector that runs on top of valgrind. With this patch, the binaries at
http://code.google.com/p/data-race-test/wiki/ThreadSanitizer#Binaries pass many
but not all of the Python tests. All of regrtest still passes outside of tsan.
I've implemented part of the C1x atomic types so that we can explicitly mark
variables that are used across threads, and get defined behavior as compilers
advance.
I've added tsan's client header and implementation to the codebase in
dynamic_annotations.{h,c} (docs at
http://code.google.com/p/data-race-test/wiki/DynamicAnnotations).
Unfortunately, I haven't been able to get helgrind and drd to give sensible
error messages, even when I use their client annotations, so I'm not supporting
them.
Miss Islington (bot)