cuCtxCreate Fails with CUDA_ERROR_INVALID_DEVICE

Question

I am getting CUDA_ERROR_INVALID_DEVICE error when creating a cuda context via cuCtxCreate.

My code is creating a context and getting device from it and creating a new context.

Any idea why I can't create another context?

#include<cuda.h>
#include<assert.h>

int main(){
        cuInit(0);
        CUcontext ctx;
        CUdevice device;

        CUdevice dev2;
        CUcontext c2;

        assert(cuDeviceGet(&device,0) == 0 );
        assert(cuCtxCreate(&ctx, 0, device) == 0);
        assert(cuCtxGetDevice(&dev2) == 0);
        assert(cuCtxCreate(&c2,0,dev2) == 0);
        return 0;
}

Answer 1

The problem was that the user had the device in exclusive mode, which prohibits creating two contexts on the single device.