cl_sys::cl_h::clCreateContext

pub unsafe extern "system" fn clCreateContext(properties: *const cl_context_properties, num_devices: cl_uint, devices: *const cl_device_id, pfn_notify: Option<extern fn(*const c_char, *const c_void, size_t, *mut c_void)>, user_data: *mut c_void, errcode_ret: *mut cl_int) -> cl_context