DIAGASSERT_STDERR
diagassert_flags |= DIAGASSERT_STDERR;
diagassert_flags &= ~DIAGASSERT_STDERR;
if (diagassert_flags & DIAGASSERT_STDERR) {
if (pthread__diagassert & DIAGASSERT_STDERR)
pthread__diagassert |= DIAGASSERT_STDERR;
pthread__diagassert &= ~DIAGASSERT_STDERR;