使用OpenCL(二)

1 cl_context clCreateContext(const cl_context_propertires* properties,
2                                           cl_uint num_devices,
3                                           const cl_device_id* devices,
4                                 void (CL_CALLBACK *pfn_notify) (
5                                 const char* errinfo,
6                                                      const void* private_info, size_t cb,
7                                                      void *user_data),
8                                 void *user_data, cl_int *errcode_ret)