Merge patch from JeremyF:

33-pre_mutex_lock

HELGRIND: two updates: add a pre_mutex_lock tracking function, so the
skin can do something before the thread blocks. This allows us to do
lock ordering tests before the thread blocks in the deadlock we'd like
to report...


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1306 a5019735-40e9-0310-863c-91ae7b9d1cf9
3 files changed