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This avoids a race condition where a thread cancels at the same time as the cancellable operation is finished and the signal handler is removed. See Cancellable::cancelled for details on how to use this.<p>
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If <em>cancellable</em> is <code>0</code> or <em>handler_id</em> is 0 this function does nothing.<p>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<table border="0" cellspacing="2" cellpadding="0">
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<tr><td valign="top"></td><td valign="top"><em>handler_id</em> </td><td>Handler id of the handler to be disconnected, or 0. </td></tr>