osfmk/man/io_done_queue_create.html

   1 <h2>io_done_queue_create</h2>
<hr>
<p>
<strong>Function</strong> - Create an <strong>io_done_queue</strong> kernel object.
<h3>SYNOPSIS</h3>
<pre>
<strong>kern_return_t   io_done_queue_create</strong>
                <strong>(mach_port_t</strong>                               <var>host</var>,
                 <strong>mach_port_t</strong>                               <var>queue</var><strong>);</strong>
</pre>
<h3>PARAMETERS</h3>
<dl>
<p>
<dt> <var>host</var>
<dd>
[in host-name send right] The name (or control) port for the host on 
which the io_done_queue should be created.
<p>
<dt> <var>queue</var>
<dd>
[out io-done-queue send right] The port referencing the created
io_done_queue.
</dl>
<h3>DESCRIPTION</h3>
<p>
The io_done_queue_create function is called to create a new
instatiation of the kernel object supporting asynchronous read/write
operations on a device.
<h3>RETURN VALUES</h3>
<dl>
<dt> <strong>KERN_INVALID_ARGUMENT</strong>
<dd>
     Invalid <var>host</var> parameter.
     <p>
     <dt> <strong>KERN_RESOURCE_SHORTAGE</strong>
<dd>
     Insufficient kernel resources to allocate kernel object.
</dl>
<h3>RELATED INFORMATION</h3>
<p>
Functions:
<a href="io_done_queue_terminate.html"><strong>io_done_queue_terminate</strong></a>,
<a href="io_done_queue_wait.html"><strong>io_done_queue_wait</strong></a>,
<a href="device_read_async.html"><strong>device_read_async</strong></a>,
<a href="device_read_async_inband.html"><strong>device_read_async_inband</strong></a>,
<a href="DR_overwrite_async.html"><strong>device_read_overwrite_async</strong></a>,
<a href="device_write_async.html"><strong>device_write_async</strong></a>,
<a href="device_write_async_inband.html"><strong>device_write_async_inband</strong></a>.