Re: [Haskell-cafe] HDBC-postgresql and safe/unsafe FFI calls

Thanks Jason, I think I had read that - I quite enjoy Edward's posts. Re-reading, seems to confirm what I thought, most (all?) of the FFI calls in HDBC-postgresql should be changed to "safe". -- David On Thu, Sep 2, 2010 at 2:47 PM, Jason Dagit wrote:

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Greetings,

I'm having an issue with the HDBC-postgresql package that requires me to manually patch it before installation for most of my use cases.

All the FFI calls in this package are marked "unsafe". Unfortunately,

On Wed, Sep 1, 2010 at 7:40 PM, David Powell wrote: this

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means that whenever I issue a slow sql query, all other processing stops. In most places that I want to use this module, I've had to manually patch it to at least mark the PQexec and PQexecParams calls as "safe".

Is there any reason these calls should not be marked as "safe"? I understand that there a little extra runtime overhead with this, but I'd have thought that negligible given all the other processing that goes on with these particular calls under the hood.

Have you read this? http://blog.ezyang.com/2010/07/safety-first-ffi-and-threading/

Perhaps it answers your questions?

Jason