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Fix banding on the R61580 LCD

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4136 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-12-05 19:59:10 +00:00
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Documentation/NuttxUserGuide.html
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@ -13,7 +13,7 @@
<h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1>
<p><small>by</small></p>
<p>Gregory Nutt<p>
<p>Last Updated: July 19, 2011</p>
<p>Last Updated: December 5, 2011</p>
</td>
</tr>
</table>
@ -1554,17 +1554,19 @@ interface of the same name.
#include &lt;mqueue.h&gt;
int mq_notify(mqd_t mqdes, const struct sigevent *notification);
</pre>
</p>
<p>
<b>Description:</b> If the &quot;notification&quot; input parameter
is not NULL, this function connects the task with the message queue such
<b>Description:</b> If the <code>notification</code> input parameter
is not <code>NULL</code>, this function connects the task with the message queue such
that the specified signal will be sent to the task whenever the message
changes from empty to non-empty. One notification can be attached
to a message queue.
</p>
<p>
If &quot;notification&quot; is NULL, the attached notification
If <code>notification</code>; is <code>NULL</code>, the attached notification
is detached (if it was held by the calling task) and the queue
is available to attach another notification.
</p>
<p>
When the notification is sent to the registered task, its registration
will be removed. The message queue will then be available for
@ -1572,27 +1574,48 @@ registration.
<p>
<b>Input Parameters:</b>
<ul>
<li><i>mqdes</i>. Message queue descriptor
<li><i>notification</i>. Real-time signal structure containing:
<li>
<code>mqdes</code>. Message queue descriptor
</li>
<li><code>notification</code>. Real-time signal structure containing:
<ul>
<li><i>sigev_notify</i>. Should be SIGEV_SIGNAL (but actually
ignored)
<li><i>sigev_signo</i>. The signo to use for the notification
<li><i>sigev_value</i>. Value associated with the signal
<li><code>sigev_notify</code>. Should be SIGEV_SIGNAL (but actually ignored)
<li><code>sigev_signo</code>. The signo to use for the notification
<li><code>sigev_value</code>. Value associated with the signal
</ul>
</ul>
</p>
<p>
<b>Returned Values:</b> None.
<b>Returned Values:</b>
On success <code>mq_notify()</code> returns 0; on error, -1 is returned, with
<code>errno</code> set to indicate the error:
<ul>
<li>
<code>EBADF</code>. The descriptor specified in <code>mqdes</code> is invalid.
</li>
<li>
<code>EBUSY</code>. Another process has already registered to receive notification
for this message queue.
</li>
<li>
<code>EINVAL</code>. <code>sevp->sigev_notify</code> is not one of the permitted values; or
<code>sevp->sigev_notify</code> is <code>SIGEV_SIGNAL</code> and <code>sevp->sigev_signo</code> is not a
valid signal number.
</li>
<li>
<code>ENOMEM</code>. Insufficient memory.
</li>
</ul>
</p>
<p>
<b>Assumptions/Limitations:</b>
</p>
<p>
<b> POSIX Compatibility:</b> Comparable to the POSIX interface
of the same name.
<b>POSIX Compatibility:</b> Comparable to the POSIX interface of the same name.
Differences from the full POSIX implementation include:
<ul>
<li>The notification signal will be sent to the registered task even if
<li>
The notification signal will be sent to the registered task even if
another task is waiting for the message queue to become non-empty. This is
inconsistent with the POSIX specification which states, &quot;If a process
has registered for notification of message arrival at a message queue and
@ -1600,7 +1623,9 @@ some process is blocked in <i>mq_receive</i> waiting to receive a message
when a message arrives at the queue, the arriving message shall satisfy the
appropriate <i>mq_receive()</i> ... The resulting behavior is as if the
message queue remains empty, and no notification shall be sent.&quot;
</li>
</ul>
</p>
<H3><a name="mqsetattr">2.4.8 mq_setattr</a></H3>