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<em class="parameter"><code><span class="type">int</span> io_priority</code></em>,
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<em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
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<em class="parameter"><code><a class="link" href="GAsyncResult.html#GAsyncReadyCallback" title="GAsyncReadyCallback ()"><span class="type">GAsyncReadyCallback</span></a> callback</code></em>,
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<p>Asyncronously splice the output stream of <em class="parameter"><code>stream1</code></em>
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<em class="parameter"><code>stream2</code></em>