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    <p>Your usage case is a truly awful idea, and I wouldn't recommend that design pattern to my worst enemy. Leaving aside the merits of the code for a moment, as I hinted in comments, you can achieve the thread local variable scoping you desire by encapsulating the __device__ functions and variables they rely on in a structure, like this:</p> <pre><code>struct folly { int id; int variable1; int variable2; int variable3; int variable4; __device__ folly(int _id) { id = _id; variable1 = 3; variable2 = 5; variable3 = 8; variable4 = 8; } __device__ int deviceFunction3() { variable1 += 8; variable4 += 7; variable2 += 1; variable3 += id; return variable1 + variable2 + variable3; } __device__ int deviceFunction2() { variable3 += 8; variable1 += deviceFunction3(); variable4 += deviceFunction3(); return variable3 + variable4; } __device__ int deviceFunction1() { variable1 += id; variable4 += 2; variable2 += deviceFunction2(); variable3 += variable2 + variable4; return variable1 + variable2 + variable3 + variable4; } }; __global__ void kernel(int *dev_a, int *dev_b, int *dev_c) { int id = threadIdx.x + blockIdx.x * blockDim.x; folly do_calc(id); dev_c[id] = do_calc.deviceFunction1(); } </code></pre> <p>Also note that CUDA supports C++ style pass by reference, so any one of the device functions you have written in the second piece of code you posted could easily be written like this:</p> <pre><code>__device__ int deviceFunction3(int &amp; variable1, int &amp; variable2, int &amp; variable3, int &amp; variable4) { variable1 += 8; variable4 += 7; variable2 += 1; variable3 += 2; return variable1 + variable2 + variable3; } </code></pre> <p>which is far cleaner and easier to read. </p>
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    1. COMy desire to design the code in this "awful" way comes, as you may have guessed, from an object-oriented line of thought. In on object oriented language, having local variables like this makes perfect sense. It is not so in C, I realise. Thank you for showing me the C++ style pass by reference, that will make my code quite a bit cleaner!
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    2. CO@mollerhoj I believe C++ is OOP language. Why wouldn't you use this and declare a proper class?
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