a size_t.">util::Blob_mutable</a></code> object describing the memory area into which we shall write on successful receipt of data. It will not be invoked at all, among other reasons, if <code>should_interrupt_func()</code> returns <code>true</code> the first time <em>it</em> is invoked. </td></tr>
    <tr><td class="paramname">should_interrupt_func</td><td>Function to execute ahead of nb-reading arriving data (copying it from kernel buffer to the target buffer); hence the general loop is await-readable/cal