task_8c.html

yavrtos,一款用于广泛用于AVR单片机的RTOS,文件里是这款OS的源码

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The current task.  <a href="group__task.html#g4743b3673a8794b8e7bd0b6c91a63cd5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structsemaphore__t.html">semaphore_t</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#add86cc9d9d60a1e9e90466dd09f3d3f">task_stopping_semaphore</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight"><p><b>For internal use only.</b></p>
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A semaphore we use to not return from <a class="el" href="group__task.html#ge1337adc1d63d7cd874a376d6513c04a" title="Stop a task.">stop_task()</a> until the task in question has actually stopped </p>
 <a href="#add86cc9d9d60a1e9e90466dd09f3d3f"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structsystem__struct.html">system_struct</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="task_8c.html#8e20fafa56301aad5b476cbd2c9e5b48">system</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight"><p><b>For internal use only.</b></p>
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The system stack, and a flag indicating whether the CPU is currently processing an interrupt </p>
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<hr><h2>Define Documentation</h2>
<a class="anchor" name="95d8d92f8a304e063ce50c912412181c"></a><!-- doxytag: member="task.c::executing_isr" ref="95d8d92f8a304e063ce50c912412181c" args="()" -->
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          <td class="memname">#define executing_isr          </td>
          <td>(</td>
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          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%">&nbsp;&nbsp;&nbsp;(system.interrupted_task)</td>
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<p><b>For internal use only.</b></p>
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Are we currently executing an ISR? </p>

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<a class="anchor" name="73254a06adc660dd59b1770c9b9f3520"></a><!-- doxytag: member="task.c::get_task_state" ref="73254a06adc660dd59b1770c9b9f3520" args="(taskptr)" -->
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          <td class="memname">#define get_task_state          </td>
          <td>(</td>
          <td class="paramtype">taskptr&nbsp;</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%">&nbsp;&nbsp;&nbsp;((taskptr)-&gt;status)</td>
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<p><b>For internal use only.</b></p>
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Get the state of a task - this macro makes it easier to put other information into task.status </p>

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<a class="anchor" name="87b5d6c508a0039ac89b09c3c71f6717"></a><!-- doxytag: member="task.c::rtos_started" ref="87b5d6c508a0039ac89b09c3c71f6717" args="()" -->
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          <td class="memname">#define rtos_started          </td>
          <td>(</td>
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          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%">&nbsp;&nbsp;&nbsp;(<a class="el" href="group__task.html#g4743b3673a8794b8e7bd0b6c91a63cd5">current_task</a>)</td>
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<p><b>For internal use only.</b></p>
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Has the RTOS been started? </p>

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<a class="anchor" name="7a659118f2c006c2570742f06614eace"></a><!-- doxytag: member="task.c::semaphore_triggered" ref="7a659118f2c006c2570742f06614eace" args="(current, required)" -->
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          <td class="memname">#define semaphore_triggered          </td>
          <td>(</td>
          <td class="paramtype">current,         <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">required&nbsp;</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%">&nbsp;&nbsp;&nbsp;((current) - (required) &gt;= 0)</td>
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Has a semaphore been triggered? 
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It is quite critical that this algorithm be correct, even when the semaphore values roll over 
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<a class="anchor" name="ec2cb6acfd1cbdf565d79d8e46366142"></a><!-- doxytag: member="task.c::set_task_state" ref="ec2cb6acfd1cbdf565d79d8e46366142" args="(taskptr, req_state)" -->
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          <td class="memname">#define set_task_state          </td>
          <td>(</td>
          <td class="paramtype">taskptr,         <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">req_state&nbsp;</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%">&nbsp;&nbsp;&nbsp;(taskptr)-&gt;status = (req_state)</td>
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<p><b>For internal use only.</b></p>
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Set the state of a task - this macro makes it easier to put other information into task.status </p>

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<hr><h2>Function Documentation</h2>
<a class="anchor" name="9963b4ea6e571f04447db7fa4a826d81"></a><!-- doxytag: member="task.c::mbox_is_empty" ref="9963b4ea6e571f04447db7fa4a826d81" args="(mailbox_t *m)" -->
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          <td class="memname">int8_t mbox_is_empty           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="structmailbox__t.html">mailbox_t</a> *&nbsp;</td>
          <td class="paramname"> <em>m</em>          </td>
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