[plt-scheme] Cleanup on servlet timeout

From: Robby Findler (robby at cs.uchicago.edu)
Date: Mon Jul 28 12:08:59 EDT 2008

On Mon, Jul 28, 2008 at 11:03 AM, Henk Boom <lunarc.lists at gmail.com> wrote:
> On 2008-07-28, Henk Boom <lunarc.lists at gmail.com> wrote:
>>  The second, however, is sqlite stuff, including freeing prepared
>>  statements and aborting transactions (I'm using a modified version of
>>  the sqlite bindings from PLaneT). These are kept on a per-response
>>  basis, so I think it would be tricky to put them all in the resource
>>  thread. Failing to do this stuff can make the database inaccessible
>>  until I restart the server, so I really need to make it reliable. Any
>>  ideas, or am I not giving enough information?
> Actually, I could share the same database handle and transaction among
> all threads. However, even then, if the last servlet thread is
> terminated the cleanup will not be done. This isn't a problem with my
> in-scheme synchronization above, since the next servlet thread to
> start will get a new set of semaphores and such, but sqlite could be
> left in a locked state. Even if I close the transaction from a will on
> the database handle, that could leave it locked until the GC actually
> happens.
> I'm guessing this requires a different solution.

What does the database connection look like? Is it via the C ffi, or a
network connection or something else?


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