documentation for SERVER_START_REQ

[Mike McCormack]

Mike Hearn wrote:

>>                                  One thing I don't understand is why
>>we put the request in two do...while(0) loops.  Won't they just run
>>once anyway?
> 
> 
> It's a portability thing, basically just declaring a new scope, you can
> ignore it - do {} while (0) runs the body of the block once.

It's to make sure that code written with SERVER_START_REQ ends with 
SERVER_END_REQ, and that the block ends with a semi-colon.

Mike