Hi, I'm working on a multi-threaded image server and I have 2 questions:

1) How "expensive" is a call to sqlite3_open. Does a call to 
sqlite3_enable_shared_cache make it "cheaper"?

2) If sqlite3_open is an expensive operation then I would like to keep a list 
(cache) of open database connections (sqlite*'s). Here's how it *should* work: 
The main thread calls sqlite3_open a couple of times and pushes the resulting 
sqlite-handles into a concurrent queue. The worker thread then pops the handle 
from the queue, does what needs to be done and pushes the handle back. No 
sqlite-handle is used by more than one thread at the same time. Is that safe?

Cheers, Christoph


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