FastCGI C library with async I/O?

I'm looking at serving HTTP from an existing C++ application, by  
using FastCGI to receive requests from Apache.

Unfortunately the standard FastCGI SDK doesn't fit my requirements  
because it uses blocking I/O, meaning that it can either process only  
a single request at a time, or must spawn a new thread for every  
simultaneous request. Neither of these options work for me --  
parallel requests are a must, I can't spawn new instances of the app,  
and multiple threads are problematic, primarily because the app code  
isn't thread-safe.

Ideally I'd like a comparable library that uses async I/O so I can  
keep running everything on a single thread. (This is what the app  
already uses for its existing networking.) The API would have to be a  
bit different, most likely invoking callbacks into my code when  
events happen, or even letting me manage the actual I/O and feeding  
the received bytes into the library.

Does such a thing exist? On the website I didn't see any C/C++  
options other than the standard SDK. I am leery of writing my own  
because the FastCGI protocol is fairly complex, and bugs in the  
implementation are likely to lead to security holes.

If I can't find a library that exists, I'm likely to switch to SCGI  
instead simply because the protocol is so simple. Or alternatively,  
if anyone knows of a C/C++ library that implements a small HTTP  
server embedded in an app, I could use that with Apache's mod_proxy.

Thanks for any tips...

--Jens
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