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by pbalcer
2944 days ago
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That's an excellent observation. You are indeed correct that pointers in memory mapped files are quite tricky to get right.
When you think about shared memory in general, this isn't a new problem [0], and the solution is almost exactly the same [1]. Instead of dealing with raw pointers, the library provides an encapsulated fat pointer which contains an offset from the beginning of the mapping.
And when the file is opened, we simply register the new virtual address, and calculate the real address when needed. [0] - https://www.boost.org/doc/libs/1_63_0/doc/html/interprocess/... [1] - http://pmem.io/pmdk/cpp_obj/master/cpp_html/classpmem_1_1obj... |
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