Method OnParent

library/cpp/yt/threading/at_fork.cpp:84–92

    void OnParent()
    {
        ForkLock_.ReleaseWriter();
        IterateAtForkHandlerSets([] (const TAtForkHandlerSet& set) {
            if (set.Parent) {
                set.Parent();
            }
        });
    }

    void OnChild()
    {