Running multi-threaded vkcts in slang mode produces errors about slang HOT 7 OPEN

This will take around 3 weeks of work.

1. There are few global static variables that needs to be added to a context so that it becomes thread safe.
2. Make sure the test_sever is able to process multiple queries simultaneously. It might need a different kind of initialization. @csyonghe can the test_sever handle multiple queries?
3. We will have to handle test_sever crash across multiple threads
4. Test the compelete list and make sure there are no issues. This takes the longest time as total time to test is high.

Approximately 3 weeks of effort including testing.

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Instead of having test server handle multiple requests in parallel, the right thing to do is to launch multiple test servers and dispatch requests to them independently. I don't think it will take three weeks if we go this route. The slang-test infrastructure used this technique to run tests in parallel without getting into the mess of thread-proofing the rest of the code.

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This can be done by having each CTS test thread create its own test server and handle the restart of test server independently in that thread. There should be no thread syncing required.

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parallel1.txt
parallel2.txt
parallel3.txt
parallel4.txt
parallel5.txt
attaching test lists that I used just for reference. I'm not sure if this is the best way to run in parallel. It's just the way I set it up.

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CTS has an option --deqp-fraction= that can run parallel threads. I am investigating it.

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It sounds like this may be resolved; Pankaj to confirm when he is back.

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The issue happens when when multiple processes are launched simultaneously. Seems like a issue with windows mechanism of registering a mutex. The issue can be wok-around by launching each process after some delay.

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