It has been pretty stressful for me to write the testing code for the E9-1-1 server these days. Multithreading programming is always challenging, it's hard to debug, the code is flowing all around, and it's easy to make mistakes with those locks, monitors, wait handles. But it's also enjoyful to dig into those codes.
After finishing the test codes, the server part also needs extensively refactoring, the I/O completion port should be used to replace the polling, the so called "virtual multithreading" should be replaced by true multi-threading.
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