06-18-2012
I'd use mmap rather than shm, since this would create an actual file that could be shared, and would be persistent across reboots. The contents of the file would effectively be memory.
How to do it depends on how you want to do it, there's no "create variable inside file" system call. You'd be building your own data structure and access methods. You might want to employ read-write locks for speed instead of global locks.
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