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<a href="#define-members">Macros</a> |
<a href="#func-members">Functions</a> </div>
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<div class="title">Mutex Management</div> </div>
<div class="ingroups"><a class="el" href="group___c_m_s_i_s___r_t_o_s.html">CMSIS-RTOS API (RTX)</a></div></div><!--header-->
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<p>Synchronize thread execution with a Mutex.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga9b522438489d7c402c95332b58bc94f3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga9b522438489d7c402c95332b58bc94f3">osMutexDef</a>(name)</td></tr>
<tr class="memdesc:ga9b522438489d7c402c95332b58bc94f3"><td class="mdescLeft"> </td><td class="mdescRight">Define a Mutex. <a href="#ga9b522438489d7c402c95332b58bc94f3"></a><br/></td></tr>
<tr class="separator:ga9b522438489d7c402c95332b58bc94f3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga1122a86faa64b4a0880c76cf68d0c934"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga1122a86faa64b4a0880c76cf68d0c934">osMutex</a>(name)   &os_mutex_def_##name</td></tr>
<tr class="memdesc:ga1122a86faa64b4a0880c76cf68d0c934"><td class="mdescLeft"> </td><td class="mdescRight">Access a Mutex definition. <a href="#ga1122a86faa64b4a0880c76cf68d0c934"></a><br/></td></tr>
<tr class="separator:ga1122a86faa64b4a0880c76cf68d0c934"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga5c9de56e717016e39e788064e9a291cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a> (const <a class="el" href="structos_mutex_def__t.html">osMutexDef_t</a> *mutex_def)</td></tr>
<tr class="memdesc:ga5c9de56e717016e39e788064e9a291cc"><td class="mdescLeft"> </td><td class="mdescRight">Create and Initialize a Mutex object. <a href="#ga5c9de56e717016e39e788064e9a291cc"></a><br/></td></tr>
<tr class="separator:ga5c9de56e717016e39e788064e9a291cc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5e1752b73f573ee015dbd9ef1edaba13"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5e1752b73f573ee015dbd9ef1edaba13">osMutexWait</a> (<a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> mutex_id, uint32_t millisec)</td></tr>
<tr class="memdesc:ga5e1752b73f573ee015dbd9ef1edaba13"><td class="mdescLeft"> </td><td class="mdescRight">Wait until a Mutex becomes available. <a href="#ga5e1752b73f573ee015dbd9ef1edaba13"></a><br/></td></tr>
<tr class="separator:ga5e1752b73f573ee015dbd9ef1edaba13"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga006e4744d741e8e132c3d5bbc295afe1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga006e4744d741e8e132c3d5bbc295afe1">osMutexRelease</a> (<a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> mutex_id)</td></tr>
<tr class="memdesc:ga006e4744d741e8e132c3d5bbc295afe1"><td class="mdescLeft"> </td><td class="mdescRight">Release a Mutex that was obtained by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5e1752b73f573ee015dbd9ef1edaba13">osMutexWait</a>. <a href="#ga006e4744d741e8e132c3d5bbc295afe1"></a><br/></td></tr>
<tr class="separator:ga006e4744d741e8e132c3d5bbc295afe1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac27e24135185d51d18f3dabc20910219"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#gac27e24135185d51d18f3dabc20910219">osMutexDelete</a> (<a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> mutex_id)</td></tr>
<tr class="memdesc:gac27e24135185d51d18f3dabc20910219"><td class="mdescLeft"> </td><td class="mdescRight">Delete a Mutex that was created by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>. <a href="#gac27e24135185d51d18f3dabc20910219"></a><br/></td></tr>
<tr class="separator:gac27e24135185d51d18f3dabc20910219"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>The Mutex Management function group is used to synchronize the execution of threads. This is for example used to protect access to a shared resource, for example a shared memory image.</p>
<dl class="section note"><dt>Note</dt><dd>Mutex Management functions cannot be called from interrupt service routines (ISR).</dd></dl>
<div class="image">
<img src="Mutex.png" alt="Mutex.png"/>
<div class="caption">
CMSIS-RTOS Mutex</div></div>
<h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define osMutex</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">name</td><td>)</td>
<td>   &os_mutex_def_##name</td>
</tr>
</table>
</div><div class="memdoc">
<p>Access to mutex object for the functions <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>name of the mutex object. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
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<td class="memname">#define osMutexDef</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">name</td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Define a mutex object that is referenced by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga1122a86faa64b4a0880c76cf68d0c934">osMutex</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>name of the mutex object. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
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<td class="memname"><a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> osMutexCreate </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structos_mutex_def__t.html">osMutexDef_t</a> * </td>
<td class="paramname"><em>mutex_def</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">mutex_def</td><td>mutex definition referenced with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga1122a86faa64b4a0880c76cf68d0c934">osMutex</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>mutex ID for reference by other functions or NULL in case of error.</dd></dl>
<p>Create and initialize a Mutex object.</p>
<dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga9b522438489d7c402c95332b58bc94f3" title="Define a Mutex.">osMutexDef</a> (MutexIsr); <span class="comment">// Mutex name definition</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> CreateMutex (<span class="keywordtype">void</span>) {</div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id; </div>
<div class="line"> </div>
<div class="line"> mutex_id = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc" title="Create and Initialize a Mutex object.">osMutexCreate</a> (<a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga1122a86faa64b4a0880c76cf68d0c934" title="Access a Mutex definition.">osMutex</a> (MutexIsr));</div>
<div class="line"> <span class="keywordflow">if</span> (mutex_id != NULL) {</div>
<div class="line"> <span class="comment">// Mutex object created</span></div>
<div class="line"> } </div>
<div class="line">}</div>
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<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osMutexDelete </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> </td>
<td class="paramname"><em>mutex_id</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">mutex_id</td><td>mutex ID obtained by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
<p>Delete a Mutex object. The function releases internal memory obtained for Mutex handling. After this call the <em>mutex_id</em> is no longer valid and cannot be used. The Mutex may be created again using the function <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>.</p>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> the mutex object has been deleted.</li>
<li><em>osErrorISR:</em> <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#gac27e24135185d51d18f3dabc20910219">osMutexDelete</a> cannot be called from interrupt service routines.</li>
<li><em>osErrorResource:</em> all tokens have already been released.</li>
<li><em>osErrorParameter:</em> the parameter <em>mutex_id</em> is incorrect.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga9b522438489d7c402c95332b58bc94f3" title="Define a Mutex.">osMutexDef</a> (MutexIsr); <span class="comment">// Mutex name definition </span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id; <span class="comment">// Mutex id populated by the function CreateMutex()</span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> CreateMutex (<span class="keywordtype">void</span>); <span class="comment">// function prototype that creates the Mutex</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> DeleteMutex (<a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id) {</div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (mutex_id != NULL) {</div>
<div class="line"> status = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#gac27e24135185d51d18f3dabc20910219" title="Delete a Mutex that was created by osMutexCreate.">osMutexDelete</a>(mutex_id);</div>
<div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f" title="function completed; no error or event occurred.">osOK</a>) {</div>
<div class="line"> <span class="comment">// handle failure code</span></div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="ga006e4744d741e8e132c3d5bbc295afe1"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osMutexRelease </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> </td>
<td class="paramname"><em>mutex_id</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">mutex_id</td><td>mutex ID obtained by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
<p>Release a Mutex that was obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5e1752b73f573ee015dbd9ef1edaba13">osMutexWait</a>. Other threads that currently wait for the same mutex will be now put into the state <b>READY</b>.</p>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> the mutex has been correctly released.</li>
<li><em>osErrorResource:</em> the mutex was not obtained before.</li>
<li><em>osErrorParameter:</em> the parameter <em>mutex_id</em> is incorrect.</li>
<li><em>osErrorISR:</em> <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga006e4744d741e8e132c3d5bbc295afe1">osMutexRelease</a> cannot be called from interrupt service routines.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga9b522438489d7c402c95332b58bc94f3" title="Define a Mutex.">osMutexDef</a> (MutexIsr); <span class="comment">// Mutex name definition </span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id; <span class="comment">// Mutex id populated by the function CreateMutex()</span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> CreateMutex (<span class="keywordtype">void</span>); <span class="comment">// function prototype that creates the Mutex</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> ReleaseMutex (<a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id) {</div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (mutex_id != NULL) {</div>
<div class="line"> status = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga006e4744d741e8e132c3d5bbc295afe1" title="Release a Mutex that was obtained by osMutexWait.">osMutexRelease</a>(mutex_id);</div>
<div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f" title="function completed; no error or event occurred.">osOK</a>) {</div>
<div class="line"> <span class="comment">// handle failure code</span></div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="ga5e1752b73f573ee015dbd9ef1edaba13"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osMutexWait </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2">osMutexId</a> </td>
<td class="paramname"><em>mutex_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>millisec</em> </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">mutex_id</td><td>mutex ID obtained by <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc">osMutexCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="_function_overview.html#CMSIS_RTOS_TimeOutValue">Timout Value</a> or 0 in case of no time-out. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
<p>Wait until a Mutex becomes available. If no other thread has obtained the Mutex, the function instantly returns and blocks the mutex object.</p>
<p>The argument <em>millisec</em> specifies how long the system waits for a mutex. While the system waits the thread that is calling this function is put into the state <b>WAITING</b>. The <em>millisec</em> timeout can have the following values:</p>
<ul>
<li>when <em>millisec</em> is 0, the function returns instantly.</li>
<li>when <em>millisec</em> is set to <b>osWaitForever</b> the function will wait for an infinite time until the mutex becomes available.</li>
<li>all other values specify a time in millisecond for a timeout.</li>
</ul>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> the mutex has been obtain.</li>
<li><em>osErrorTimeoutResource:</em> the mutex could not be obtained in the given time.</li>
<li><em>osErrorResource:</em> the mutex could not be obtained when no timeout was specified.</li>
<li><em>osErrorParameter:</em> the parameter <em>mutex_id</em> is incorrect.</li>
<li><em>osErrorISR:</em> <a class="el" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5e1752b73f573ee015dbd9ef1edaba13">osMutexWait</a> cannot be called from interrupt service routines.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga9b522438489d7c402c95332b58bc94f3" title="Define a Mutex.">osMutexDef</a> (MutexIsr);</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> WaitMutex (<span class="keywordtype">void</span>) {</div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a3263c1ad9fd79b84f908d65e8da44ac2" title="Mutex ID identifies the mutex (pointer to a mutex control block).">osMutexId</a> mutex_id; </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status;</div>
<div class="line"> </div>
<div class="line"> mutex_id = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5c9de56e717016e39e788064e9a291cc" title="Create and Initialize a Mutex object.">osMutexCreate</a> (<a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga1122a86faa64b4a0880c76cf68d0c934" title="Access a Mutex definition.">osMutex</a> (MutexIsr));</div>
<div class="line"> <span class="keywordflow">if</span> (mutex_id != NULL) {</div>
<div class="line"> status = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html#ga5e1752b73f573ee015dbd9ef1edaba13" title="Wait until a Mutex becomes available.">osMutexWait</a> (mutex_id, 0);</div>
<div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f" title="function completed; no error or event occurred.">osOK</a>) {</div>
<div class="line"> <span class="comment">// handle failure code</span></div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
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