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This is the treedb project ("treedb")
This project is hosted by SourceForge.net. The project team describes it as:
treedb can implement malloc functionality, and much more! Need a heap that allocates from a fixed size chunk of memory? No problem. But where treedb comes into its own is when it comes to allocating from a mmap()ed disk file - the memory becomes persistent. If you follow the tests/examples, you too can store dictionaries, trees, lists or whatever you can think of in disk-based memory, just an open() and mmap() away. Treedb comes with an AVL tree, doubly-linked-list and variable-entry sized-array implementations for you to use in your data structures.
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