CUDA中自动初始化显卡设备宏

每次为了减少初始化的工作量，可以写入下面的宏。

#define CUT_DEVICE_INIT(ARGC,ARGV){    
    int deviceCount;    
    CUDA_SAFE_CALL_NO_SYNC(cudaGetDeviceCount(&deviceCount));    
    if(deviceCount == 0){    
        fprintf(stderr,"cutil error:no devices supporting CUDA.
")    
        exit(EXIT_FAILURE);    
    }    
    int dev=0;    
    cutGetCmdLineArgumenti(ARGC,(const char **) ARGV,"device",&dev);    
    if(dev < 0) dev=0;    
    if(dev > deviceCount - 1) dev=deviceCount - 1;    
    cudaDeviceProp deviceProp;    
    CUDA_SAFE_CALL_NO_SYNC(cudaGetDeviceProperties(&deviceProp,dev));    
    if(deviceProp.major < 1){    
        fprintf(stderr,"cutil error: device does not support CUDA.
");    
        exit(EXIT_FAILURE);    
    }    
    if(cutCheckCmdLineFlag(ARGC,    (const char **) ARGV,"quiet") == CUTFalse)    
        fprintf(stderr,"Using device %d:%s
",dev,deviceProp.name);    
    CUDA_SAFE_CALL(cudaSetDevice(dev));    
}

#define CUT_EXIT(argc,argv)    
    if(!cutCheckCmdLineFlag(argc, ( const char **)argv, "noprompt")){    
        printf("
 Press ENTER to exit...
");    
        fflush(stdout);    
        fflush(stderr);    
        
        getchar();    
    }    
exit(EXIT_SUCCESS);

在主程序中：

int main(int argc,char** argv){
    CUT_DEVICE_INIT(argc,argv);
    ...主程序内容
    CUT_EXIT(argc,argv);
}