mpm_winnt: Remove an unnecessary Sleep() in the winnt_accept() function.
This sleep occured in a situation when:
- We don't have a free completion context in the queue - We can't add one, as doing so would exceed the max_num_completion_contexts limit (all worker threads are busy) - We have exceeded a 1 second timeout while waiting for it
In this case, the Sleep() call is unnecessary, as there is no intermittent failure that can be waited out, but rather than that, it's an ordinary situation with all workers being busy. Presumably, calling Sleep() here can be even considered harmful, as it affects the fairness between the listeners that are blocked waiting for the completion context.
So, instead of calling Sleep() just check for the possible shutdown and immediately retry acquiring a completion context. If all worker threads are still busy, the retry will block in the same WaitForSingleObject() call, which is fine.
mpm_winnt: Simplify the shutdown code that was waiting for multiple worker thread handles in batches.
Starting from r1801636, there is no difference between ending the wait with one or multiple remaining threads. This is because we terminate the process if at least one thread is still active when we hit a timeout.
Therefore, instead of making an effort to evenly distribute and batch the handles with WaitForMultipleObjects(), we could just start from one end, and wait for one thread handle at a time.