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7 check-ins related to "threadtest4"

Remove the KeyInfo cache (for now - perhaps we will add it back in later - or maybe not since it provides negligible benefit but adds a lot of complexity and thread-safety risk). Add a mutex to ATTACH to deal with a data race. check-in: 03c443eaf2 user: drh tags: trunk
Make sure the Btree mutex is held when setting the locking mode and the secure delete flag when attaching a shared-cache database. Closed-Leaf check-in: 6bef7ede2b user: drh tags: threadtest4
Merge the cell overflow page number cache thread race fix from trunk. check-in: cefad47ec2 user: drh tags: threadtest4
Fix a bug in the threadtest4.c program. Remove the keyinfo cache as it provides minimal performance improvements, and then only at SQL preparation time, not at runtime, and it has problems with data races in shared-cache mode. We might later add the keyinfo cache back but only enable it when shared-cache mode is off. check-in: b7489f9451 user: drh tags: threadtest4
Add the threadtest4.c test program. Not yet working. check-in: ec3a74469c user: drh tags: threadtest4
Fix a race condition to do with very large index keys in shared-cache mode. check-in: fc157dd7f1 user: dan tags: trunk
Fix a typo in the documentation for sqlite3_threadsafe(). check-in: 258e747bb7 user: drh tags: trunk