Function cl_sys::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 "C" fn(_: *const c_char, _: *const c_void, _: size_t, _: *mut c_void)>, 
    user_data: *mut c_void, 
    errcode_ret: *mut cl_int
) -> cl_context