+threadskv1.c Multi-Threaded/Multi-Process based on threads2i.c that generalizes key/value storage in the btree pages. The page slots are reduced to 16 or 32 bits, and the value byte storage occurs along with the key storage.
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+threadskv2.c Multi-Threaded/Multi-Process based on threadskv1 that replaces the linear sorted key array with a red/black tree.
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+threadskv3.c Multi-Threaded/Multi-Process based on threadskv1 that introduces librarian filler slots in the linear key array to minimize data movement when a new key is inserted into the middle of the array.
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+threadskv4b.c Multi-Threaded/Multi-Process based on threadskv3 that manages duplicate keys added to the btree.
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+threadskv5.c Multi-Threaded/Multi-Process based on threadskv4b that supports bi-directional cursors through the btree. Also supports raw disk partitions for btrees.
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