This is for those of you who've done some IO completion port work.
According to my reading of the docs, GetQueuedCompletionStatus has four
return status';
---
1. return value != 0
- all went well, we've just returned from a successful dequeuing
2. return value != 0 and lpOverlapped == NULL
- all handles associated with the IO completion object have been
closed and the IO completion object itself has been closed (time to quit)
3. return value == 0 and lpOverlapped != NULL
- GetQueuedCompletionStatus() was okay, but we dequeued a *failed*
IO operation (note that lpNumberOfBytes is not set in this case)
4. return value == ERROR_SUCCESS and lpOverlapped != NULL and
*lpNumberOfBytes == 0
- the handle we've come back on is actually a socket, and the remote
host has closed
---
Now, the problem is this: ERROR_SUCCESS is #defined as zero!
In other words, I don't think it's possible to differentiate between
case 3 and 4, because in case 3, *lpNumberOfBytes might be 0 just by chance.
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