[vbox-dev] Fix to #13802

[a.urakov at drweb.com]

Hello!

We would like to contribute to VirtualBox under MIT license. We send our 
changes to fix bug described at https://www.virtualbox.org/ticket/13802 .

The idea is that we not only check waiting workers presence but also 
compare amount of waiting workers and amount of requests. So when amount 
of request is greater than amount of free workers (and situation not 
changed after short sleeping) we create new worker. In this case there 
will be always sufficient amount of workers.

We find amount of requests by iterating through whole list and it seems 
like it doesn't cause execution speed decreasing (due to not so big 
requests queue). But if there will be some problems with it we can 
correct code to count elements on every appending / removing operation 
(this way not so good because count variable must be changed in every 
append / remove / etc operation and every new operation in ipcList class).

Regards,
Alexander

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