/// <summary>
/// Call <c>select()</c> on the Easy objects.
/// </summary>
/// <param name="timeoutMillis">
/// The timeout for the internal <c>select()</c> call,
/// in milliseconds.
/// </param>
/// <returns>
/// Number or <see cref="Easy"/> objects with pending reads.
/// </returns>
/// <exception cref="System.NullReferenceException">
/// This is thrown if the native <c>Multi</c> handle wasn't
/// created successfully.
/// </exception>
public int Select(int timeoutMillis)
{
EnsureHandle();
return(External.curl_shim_select(m_maxFD + 1,
m_fdSets, timeoutMillis));
}