| |
| #include <cuda.h> |
| #include <iostream> |
| #include <string> |
| |
| #ifdef _WIN32 |
| #define EXPORT __declspec(dllexport) |
| #else |
| #define EXPORT |
| #endif |
| |
| int dynamic_base_func(int); |
| |
| EXPORT int __host__ cuda_dynamic_host_func(int x) |
| { |
| return dynamic_base_func(x); |
| } |
| |
| static __global__ void DetermineIfValidCudaDevice() |
| { |
| } |
| |
| EXPORT int choose_cuda_device() |
| { |
| int nDevices = 0; |
| cudaError_t err = cudaGetDeviceCount(&nDevices); |
| if (err != cudaSuccess) { |
| std::cerr << "Failed to retrieve the number of CUDA enabled devices" |
| << std::endl; |
| return 1; |
| } |
| for (int i = 0; i < nDevices; ++i) { |
| cudaDeviceProp prop; |
| cudaError_t err = cudaGetDeviceProperties(&prop, i); |
| if (err != cudaSuccess) { |
| std::cerr << "Could not retrieve properties from CUDA device " << i |
| << std::endl; |
| return 1; |
| } |
| if (prop.major >= 3) { |
| err = cudaSetDevice(i); |
| if (err != cudaSuccess) { |
| std::cout << "Could not select CUDA device " << i << std::endl; |
| } else { |
| return 0; |
| } |
| } |
| } |
| |
| std::cout << "Could not find a CUDA enabled card supporting compute >=3.0" |
| << std::endl; |
| |
| return 1; |
| } |
| |
| EXPORT void cuda_dynamic_lib_func() |
| { |
| DetermineIfValidCudaDevice<<<1, 1>>>(); |
| cudaError_t err = cudaGetLastError(); |
| if (err != cudaSuccess) { |
| std::cerr << "DetermineIfValidCudaDevice [SYNC] failed: " |
| << cudaGetErrorString(err) << std::endl; |
| } |
| err = cudaDeviceSynchronize(); |
| if (err != cudaSuccess) { |
| std::cerr << "DetermineIfValidCudaDevice [ASYNC] failed: " |
| << cudaGetErrorString(cudaGetLastError()) << std::endl; |
| } |
| } |