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C++ behavior for 'while' using output from function

VS 2005, C++, WinXP SP2

I'd like the experts opinions on what the 'while' loop below does? Does it takes the result from AtPollEvent and compare against NOT being -1 and assigns that to retvalue. OR does it assign retvalue the result from AtPollEvent and then compares against NOT being -1?

AtPollEvent(connId, eventName, (EventType *)&eventValue);
return (int)eventValue;

int retvalue = 0;

while ((retvalue = AtPollEvent(id, Aname, (EventType *) &lockvalue) != -1))

Thanks for your input.

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sorry, forget my second statement.

Sara

ASKER

Thanks all. Your comments helped to understand the issue ... and gives a way forward.