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<div class="param_info"><code class="code">blocking</code> : Whether the channel waits until it can output if it is not
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possible to write to the (non-blocking) descriptor. Defaults to <code class="code">true</code>.</div>
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<div class="param_info"><code class="code">start_pos_out</code> : The position to which <code class="code">pos_out</code> is initialized when