hsvc

@cameron314 This issue looks quite serious. To address it, I've submitted https://github.com/cameron314/concurrentqueue/pull/406, which is based on [this commit](https://github.com/XiaoXuan42/concurrentqueue/commit/65bbc7ee971d33129d7e29b02afd76984a993d83). When you have a moment, could you please review the changes? Thank...