ARM-software
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CMSIS_5
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<title>CMSIS-RTOS2: Thread Flags</title>
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   <div id="projectname">CMSIS-RTOS2
   &#160;<span id="projectnumber">Version 2.1.3</span>
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   <div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation</div>
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<div class="header">
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<a href="#func-members">Functions</a>  </div>
  <div class="headertitle">
<div class="title">Thread Flags<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API v2</a></div></div>  </div>
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<div class="contents">

<p>Synchronize threads using flags.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga6f89ef9caded1d9963c7b12b0f6412c9"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a> (<a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gaa6c32fe2a3e0a2e01f212d55b02e51c7">osThreadId_t</a> thread_id, uint32_t flags)</td></tr>
<tr class="memdesc:ga6f89ef9caded1d9963c7b12b0f6412c9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Set the specified Thread Flags of a thread.  <a href="#ga6f89ef9caded1d9963c7b12b0f6412c9">More...</a><br/></td></tr>
<tr class="separator:ga6f89ef9caded1d9963c7b12b0f6412c9"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga656abc1c862c5b9a2b13584c42cc0bfa"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga656abc1c862c5b9a2b13584c42cc0bfa">osThreadFlagsClear</a> (uint32_t flags)</td></tr>
<tr class="memdesc:ga656abc1c862c5b9a2b13584c42cc0bfa"><td class="mdescLeft">&#160;</td><td class="mdescRight">Clear the specified Thread Flags of current running thread.  <a href="#ga656abc1c862c5b9a2b13584c42cc0bfa">More...</a><br/></td></tr>
<tr class="separator:ga656abc1c862c5b9a2b13584c42cc0bfa"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga85c8d2c89466e25abbcb545d9ddd71ba"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga85c8d2c89466e25abbcb545d9ddd71ba">osThreadFlagsGet</a> (void)</td></tr>
<tr class="memdesc:ga85c8d2c89466e25abbcb545d9ddd71ba"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the current Thread Flags of current running thread.  <a href="#ga85c8d2c89466e25abbcb545d9ddd71ba">More...</a><br/></td></tr>
<tr class="separator:ga85c8d2c89466e25abbcb545d9ddd71ba"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:gac11542ad6300b600f872fc96e340ec2b"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a> (uint32_t flags, uint32_t options, uint32_t timeout)</td></tr>
<tr class="memdesc:gac11542ad6300b600f872fc96e340ec2b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait for one or more Thread Flags of the current running thread to become signaled.  <a href="#gac11542ad6300b600f872fc96e340ec2b">More...</a><br/></td></tr>
<tr class="separator:gac11542ad6300b600f872fc96e340ec2b"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>Thread Flags are a more specialized version of the Event Flags. See <a class="el" href="group__CMSIS__RTOS__EventFlags.html">Event Flags</a>. While Event Flags can be used to globally signal a number of threads, thread flags are only send to a single specific thread. Every thread instance can receive thread flags without any additional allocation of a thread flags object.</p>
<dl class="section note"><dt>Note</dt><dd>Thread flag management functions cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>, except for <a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>.</dd></dl>
<p><b>Usage Example</b></p>
<p>The following (incomplete) code excerpt sketches the usage principals for <b>Thread Flags</b>.</p>
<p>The behavior is the following:</p>
<ul>
<li>app_main starts executing</li>
<li>statement A sets thread flags to 0x02 (flags = 0x02 – after set)</li>
<li>app_main enters delay</li>
<li>execution switches to threadX</li>
<li>statement B waits for flag 0x01 and blocks since flag is not set</li>
<li>execution switches to app_main</li>
<li>statement C sets thread flags to 0x07</li>
<li>threadX wakes-up and clears flag 0x01, thread flags = 0x06, return value set to 0x07 (before clear), note: all this happens during statement C</li>
<li>statement C returns with flags = 0x06</li>
<li>app_main enters delay</li>
<li>execution switches to threadX</li>
<li>statement B returns with flagsX = 0x07</li>
</ul>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaa6c32fe2a3e0a2e01f212d55b02e51c7">osThreadId_t</a> tid;</div>
<div class="line">uint32_t     flagsX;</div>
<div class="line">uint32_t     flags;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> threadX (<span class="keywordtype">void</span> *argument) {</div>
<div class="line">  </div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(1U);</div>
<div class="line">  <span class="keywordflow">for</span> (;;) {</div>
<div class="line">    flagsX = <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a>(0x0001U, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga18e63587b8450d5b8798b6f6ec04e012">osFlagsWaitAny</a>, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga9eb9a7a797a42e4b55eb171ecc609ddb">osWaitForever</a>); <span class="comment">/* B */</span></div>
<div class="line">  }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> app_main (<span class="keywordtype">void</span> *argument) {</div>
<div class="line"> </div>
<div class="line">  tid = <a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f">osThreadNew</a>(threadX, NULL, NULL);</div>
<div class="line"> </div>
<div class="line">  flags = <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>(tid, 0x0002U); <span class="comment">/* A */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(2U);</div>
<div class="line">  flags = <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>(tid, 0x0005U); <span class="comment">/* C */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(2U);</div>
<div class="line"> </div>
<div class="line">  <span class="keywordflow">for</span>(;;);</div>
<div class="line">}</div>
</div><!-- fragment --> <h2 class="groupheader">Function Documentation</h2>
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          <td class="memname">uint32_t osThreadFlagsSet </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gaa6c32fe2a3e0a2e01f212d55b02e51c7">osThreadId_t</a>&#160;</td>
          <td class="paramname"><em>thread_id</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>flags</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">thread_id</td><td>thread ID obtained by <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f">osThreadNew</a> or <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ga8df03548e89fbc56402a5cd584a505da">osThreadGetId</a>. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">flags</td><td>specifies the flags of the thread that shall be set. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>thread flags after setting or error code if highest bit set.</dd></dl>
<p>The function <b>osThreadFlagsSet</b> sets the thread flags for a thread specified by parameter <em>thread_id</em>. The thread returns the flags stored in the thread control block, or an error code if highest bit is set (refer to <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a>). Refer to <b>Usage</b> <b>Examples</b> below to understand how the return value is computed.</p>
<p>The target thread waiting for a flag to be set will resume from <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a> state.</p>
<p>Possible <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a> return values:</p>
<ul>
<li><em>osFlagsErrorUnknown:</em> unspecified error.</li>
<li><em>osFlagsErrorParameter:</em> parameter <em>thread_id</em> is not a valid thread or <em>flags</em> has highest bit set.</li>
<li><em>osFlagsErrorResource:</em> the thread is in invalid state.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>This function may be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Code</b> <b>Example</b> </p>
<div class="fragment"><div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
<div class="line"><span class="comment"> *      Function &#39;signal_func&#39; called from multiple threads</span></div>
<div class="line"><span class="comment"> *---------------------------------------------------------------------------*/</span></div>
<div class="line"><span class="keywordtype">void</span> signal_func (<a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaa6c32fe2a3e0a2e01f212d55b02e51c7">osThreadId_t</a> tid)  {</div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>(tid_clock, 0x0100U);     <span class="comment">/* set signal to clock thread    */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(500U);                            <span class="comment">/* delay 500ms                   */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>(tid_clock, 0x0100U);     <span class="comment">/* set signal to clock thread    */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(500U);                            <span class="comment">/* delay 500ms                   */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga6f89ef9caded1d9963c7b12b0f6412c9">osThreadFlagsSet</a>(tid, 0x0001U);           <span class="comment">/* set signal to thread &#39;thread&#39; */</span></div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(500U);                            <span class="comment">/* delay 500ms                   */</span></div>
<div class="line">}</div>
</div><!-- fragment --><p><b>Usage</b> <b>Examples</b> </p>
<p>The following diagram assumes that in the control block of Thread1 the flag 1 is already set. Thread2 now sets flag 2 and Thread1 returns the updated value immediately:</p>
<div align="center">
<img src="msc_inline_mscgraph_1.png" alt="msc_inline_mscgraph_1" border="0" usemap="#msc_inline_mscgraph_1.map"/>
<map name="msc_inline_mscgraph_1.map" id="msc_inline_mscgraph_1.map"></map>
</div>
<p>Depending on thread scheduling, the flag status can be modified before returning:</p>
<div align="center">
<img src="msc_inline_mscgraph_2.png" alt="msc_inline_mscgraph_2" border="0" usemap="#msc_inline_mscgraph_2.map"/>
<map name="msc_inline_mscgraph_2.map" id="msc_inline_mscgraph_2.map"></map>
</div>
 <dl class="section note"><dt>Note</dt><dd>* In this case <a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a> auto-clears the flag. </dd></dl>

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          <td class="memname">uint32_t osThreadFlagsClear </td>
          <td>(</td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>flags</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">flags</td><td>specifies the flags of the thread that shall be cleared. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>thread flags before clearing or error code if highest bit set.</dd></dl>
<p>The function <b>osThreadFlagsClear</b> clears the specified flags for the currently running thread. It returns the flags before clearing, or an error code if highest bit is set (refer to <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a>).</p>
<p>Possible <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a> return values:</p>
<ul>
<li><em>osFlagsErrorUnknown:</em> unspecified error, i.e. not called from a running threads context.</li>
<li><em>osFlagsErrorParameter:</em> parameter <em>flags</em> has highest bit set.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>

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          <td class="memname">uint32_t osThreadFlagsGet </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<dl class="section return"><dt>Returns</dt><dd>current thread flags.</dd></dl>
<p>The function <b>osThreadFlagsGet</b> returns the flags currently set for the currently running thread. If called without a active and currently running thread <b>osThreadFlagsGet</b> return zero.</p>
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>

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<div class="memproto">
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          <td class="memname">uint32_t osThreadFlagsWait </td>
          <td>(</td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>flags</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>options</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>timeout</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
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<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">flags</td><td>specifies the flags to wait for. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">options</td><td>specifies flags options (osFlagsXxxx). </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">timeout</td><td><a class="el" href="theory_of_operation.html#CMSIS_RTOS_TimeOutValue">Timeout Value</a> or 0 in case of no time-out. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>thread flags before clearing or error code if highest bit set.</dd></dl>
<p>The function <b>osThreadFlagsWait</b> suspends the execution of the currently <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">RUNNING</a> thread until any or all of the thread flags specified with the parameter <em>flags</em> are set. When these thread flags are already set, the function returns instantly. Otherwise the thread is put into the state <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a>.</p>
<p>The parameter <em>options</em> specifies the wait condition: </p>
<table class="doxtable">
<tr>
<th>Option </th><th></th></tr>
<tr>
<td><b>osFlagsWaitAny</b> </td><td>Wait for any flag (default). </td></tr>
<tr>
<td><b>osFlagsWaitAll</b> </td><td>Wait for all flags. </td></tr>
<tr>
<td><b>osFlagsNoClear</b> </td><td>Do not clear flags which have been specified to wait for. </td></tr>
</table>
<p>If <code>osFlagsNoClear</code> is set in the options <a class="el" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#ga656abc1c862c5b9a2b13584c42cc0bfa">osThreadFlagsClear</a> can be used to clear flags manually. Otherwise <b>osThreadFlagsWait</b> automatically clears the flags waited for.</p>
<p>The parameter <a class="el" href="theory_of_operation.html#CMSIS_RTOS_TimeOutValue">timeout</a> represents a number of timer ticks and is an upper bound. The exact time delay depends on the actual time elapsed since the last timer tick.</p>
<p>The function returns the flags before clearing, or an error code if highest bit is set (refer to <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a>).</p>
<p>Possible <a class="el" href="group__flags__error__codes.html">Flags Functions Error Codes</a> return values:</p>
<ul>
<li><em>osFlagsErrorUnknown:</em> unspecified error, i.e. not called from a running threads context.</li>
<li><em>osFlagsErrorTimeout:</em> awaited flags have not been set in the given time.</li>
<li><em>osFlagsErrorResource:</em> awaited flags have not been set when no <em>timeout</em> was specified.</li>
<li><em>osFlagsErrorParameter:</em> Parameter <em>flags</em> has highest bit set.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Code Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> Thread (<span class="keywordtype">void</span>* arg) {</div>
<div class="line">  ;</div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a>(0x00000001U, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga18e63587b8450d5b8798b6f6ec04e012">osFlagsWaitAny</a>, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga9eb9a7a797a42e4b55eb171ecc609ddb">osWaitForever</a>); <span class="comment">// Wait forever until thread flag 1 is set.</span></div>
<div class="line">  ;</div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a>(0x00000003U, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga18e63587b8450d5b8798b6f6ec04e012">osFlagsWaitAny</a>, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga9eb9a7a797a42e4b55eb171ecc609ddb">osWaitForever</a>); <span class="comment">// Wait forever until either thread flag 0 or 1 is set.</span></div>
<div class="line">  ;</div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a>(0x00000003U, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga8b6f562736fbfb5428940e0c017dec24">osFlagsWaitAll</a>, 10U); <span class="comment">// Wait for 10 timer ticks until thread flags 0 and 1 are set. Timeout afterwards.</span></div>
<div class="line">  ;</div>
<div class="line">  <a class="code" href="group__CMSIS__RTOS__ThreadFlagsMgmt.html#gac11542ad6300b600f872fc96e340ec2b">osThreadFlagsWait</a>(0x00000003U, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga8b6f562736fbfb5428940e0c017dec24">osFlagsWaitAll</a> | <a class="code" href="group__CMSIS__RTOS__Definitions.html#gaade844a42237d8c37569d4d9b16b9f1c">osFlagsNoClear</a>, <a class="code" href="group__CMSIS__RTOS__Definitions.html#ga9eb9a7a797a42e4b55eb171ecc609ddb">osWaitForever</a>); <span class="comment">// Same as the above, but the flags will not be cleared.</span></div>
<div class="line">}</div>
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