本文讨论了在删除某些对象时遇到看似奇怪的问题，特别是当这些对象来自无法直接检查其内部代码的静态库文件时。为了解决这个问题，采用单例模式进行代理操作，确保仅在系统关闭时才执行删除操作。
sometime our project can run into some seem strange problem during we delete someobj , some of the code are .a static library file that we can't check it's code.
we currently use singleton to do a proxy job to avoid this core dump problem. ----- we only delete them when the system goes shut down
can ref to this article:
http://www.cnblogs.com/Solstice/archive/2010/02/10/dtor_meets_threads.html
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