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Upon return from the function, the unmanaged bool value is converted to the managed bool. Remember that a managed bool is actually an alias for the struct System.Boolean. It is not represented the same way as a simple C/C++ integer with a zero or nonzero value. To see the difference blittable types make on the performance, we can rewrite the unmanaged function like this; int BlittableFunction(__int8 valueToTest) { return islower(valueToTest); } To improve performance using blittable types, we change the unmanaged function signature slightly. We start by changing the input parameter from a char to a __int8. This is a Microsoftspecific C++ type that represents an 8-bit integer the same size as an ANSI char. The function is then changed to return an integer rather than a bool. The islower runtime function actually returns an integer, so we can return the result directly without any additional checks in the unmanaged code. The declaration of this new function in managed code looks like this: [DllImport("FlatAPILib.DLL")] public static extern int BlittableFunction(byte valueToTest); We then run the same test of 100,000 calls on this revised function: const int numberOfCalls bool result; = 100000;

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6,513. 5

Summary

//create the StopWatch used for timings Stopwatch stopWatch = new Stopwatch(); //test blittable function stopWatch.Start(); for(int i = 0; i < numberOfCalls; i++) { result = (BlittableTypesTest.BlittableFunction((byte)'a') != 0); } stopWatch.Stop(); Console.WriteLine( "{0} Blittable function calls: {1} milliseconds", numberOfCalls, stopWatch.ElapsedMilliseconds); Notice that we ve moved the logic that checks the function result for a nonzero value into the managed code. Previously, the unmanaged code made this check and returned an unmanaged bool. The problem is that the unmanaged bool required additional marshaling into the managed bool. We avoid that marshaling overhead by performing that check in the managed code. The result of this test is typically around 30 milliseconds on my machine.

((A * 256) + B) / 10 40

100000 Blittable function calls:

Bit encoded [A7..D0] == [PID 0x41..PID 0x60]

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That makes the function call using blittable types twice as fast (give or take a few milliseconds). For good measure, we can perform this same test entirely in unmanaged code. This will further demonstrate the overhead associated with the PInvoke calls. To do this, we write a new unmanaged function that performs the same loop 100,000 times. The function looks like this: // function for blittable type testing // used to execute test entirely in unmanaged code void BlittableUnmanagedTest() { const int numberOfCalls = 100000; bool result = false; for(int i = 0; i < numberOfCalls; i++) { result = ::NonblittableFunction('a'); } } Notice that the function executes the same NonblittableFunction unmanaged function that we tested previously. The difference is this time, our managed code calls this unmanaged function only once and we stay there, executing NonblittableFunction 100,000 times. No marshaling of parameters is required, so we should see the best possible performance. We can declare this function in our C# code like this: [DllImport("FlatAPILib.DLL")] public static extern void BlittableUnmanagedTest(); In our managed code, we use the Stopwatch class to time the call just as before: //perform the same test, done entirely in unmanaged code stopWatch.Start(); BlittableTypesTest.BlittableUnmanagedTest(); stopWatch.Stop(); Console.WriteLine( "{0} Unmanaged only test: {1} milliseconds", numberOfCalls, stopWatch.ElapsedMilliseconds); The results are even better than the test from managed code using blittable types. 100000 Unmanaged only test: 10.0144 milliseconds

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In this chapter, you learned about two of the most important features of FogBugz: e-mail and discussion group management. You saw how you can use e-mail within your team, and as a means of communicating with customers, all under the control of FogBugz. You also learned how to set up and moderate discussion groups to help create a community around your products. In the final chapter, I ll turn to one more major aspect of FogBugz, this one of great interest to software developers: integrating your bug reports and your source code control system.

Finally, for a good comparison between managed and unmanaged code, we can perform this same test entirely in managed code, completely bypassing all interop issues. The C# code looks like this:

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