How to check for pending CancelRequest from C/C++ function

Stephen Woodbridge <woodbri@xxxxxxxxxxxxxxx> · Mon, 06 Jan 2014 10:13:46 -0500

Hi all,

I writing some functions for postgresql extension in C/C++ and I would 
like to be able to check for a pending CancelRequest from the frontend 
so I can take appropriate action to honor this request.

1. How to I check if a request is pending?
2. What is the appropriate action?
   I assume this should be something like:
   a. cleanup as needed
   b. elog(ERROR, "terminated at user cancel request.");

Is there an example of this in contrib or elsewhere that you can point 
me to?

Thanks,
  -Steve

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