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diff --git a/CMSIS/Documentation/RTOS/html/group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html b/CMSIS/Documentation/RTOS/html/group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html new file mode 100644 index 0000000..5cebaa7 --- /dev/null +++ b/CMSIS/Documentation/RTOS/html/group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html @@ -0,0 +1,405 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"> +<head> +<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> +<meta http-equiv="X-UA-Compatible" content="IE=9"/> +<title>Mutexes</title> +<title>CMSIS-RTOS: Mutexes</title> +<link href="tabs.css" rel="stylesheet" type="text/css"/> +<link href="cmsis.css" rel="stylesheet" type="text/css" /> +<script type="text/javascript" src="jquery.js"></script> +<script type="text/javascript" src="dynsections.js"></script> +<script type="text/javascript" src="printComponentTabs.js"></script> +<link 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writeComponentTabs.call(this); + //--> + </script> + </ul> +</div> +<!-- Generated by Doxygen 1.8.2 --> + <div id="navrow1" class="tabs"> + <ul class="tablist"> + <li><a href="index.html"><span>Main Page</span></a></li> + <li><a href="pages.html"><span>Usage and Description</span></a></li> + <li><a href="modules.html"><span>Reference</span></a></li> + </ul> + </div> +</div><!-- top --> +<div id="side-nav" class="ui-resizable side-nav-resizable"> + <div id="nav-tree"> + <div id="nav-tree-contents"> + <div id="nav-sync" class="sync"></div> + </div> + </div> + <div id="splitbar" style="-moz-user-select:none;" + class="ui-resizable-handle"> + </div> +</div> +<script type="text/javascript"> +$(document).ready(function(){initNavTree('group___c_m_s_i_s___r_t_o_s___mutex_mgmt.html','');}); +</script> +<div id="doc-content"> +<div class="header"> + <div class="summary"> +<a href="#define-members">Macros</a> | +<a href="#func-members">Functions</a> </div> + <div class="headertitle"> +<div class="title">Mutexes</div> </div> +<div class="ingroups"><a class="el" href="group___c_m_s_i_s___r_t_o_s___inter_thread.html">Inter-Thread Communication and Resource Sharing</a></div></div><!--header--> +<div class="contents"> + +<p>Synchronize resource access using Mutual Exclusion (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)   const <a class="el" href="structos_mutex_def__t.html">osMutexDef_t</a> os_mutex_def_##name = { 0 }</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> +</table> +<a name="details" id="details"></a><h2 class="groupheader">Description</h2> +<p><b>Mutual exclusion</b> (widely known as <b>Mutex</b>) is used in various operating systems for resource management. Many resources in a microcontroller device can be used repeatedly, but only by one thread at a time (for example communication channels, memory, and files). Mutexes are used to protect access to a shared resource. A mutex is created and then passed between the threads (they can acquire and release the mutex).</p> +<div class="image"> +<img src="Mutex.png" alt="Mutex.png"/> +<div class="caption"> +CMSIS-RTOS Mutex</div></div> +<p> A mutex is a special version of a <a class="el" href="group___c_m_s_i_s___r_t_o_s___semaphore_mgmt.html">semaphore</a>. Like the semaphore, it is a container for tokens. But instead of being able to have multiple tokens, a mutex can only carry one (representing the resource). Thus, a mutex token is binary and bounded. The advantage of a mutex is that it introduces thread ownership. When a thread acquires a mutex and becomes its owner, subsequent mutex acquires from that thread will succeed immediately without any latency. Thus, mutex acquires/releases can be nested.</p> +<dl class="section note"><dt>Note</dt><dd><ul> +<li>Mutex management functions cannot be called from interrupt service routines (ISR), unlike a binary semaphore that can be released from an ISR.</li> +</ul> +</dd></dl> +<h2>Working with Mutexes</h2> +<p>To use mutexes, you need to follow these steps for creating and using them:</p> +<ol type="1"> +<li>Declare the mutex container and initialize the mutex: <div class="fragment"><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> (uart_mutex); <span class="comment">// Declare mutex</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> (uart_mutex_id); <span class="comment">// Mutex ID</span></div> +</div><!-- fragment --></li> +<li>Create the mutex in a thread: <div class="fragment"><div class="line">uart_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>(uart_mutex));</div> +</div><!-- fragment --></li> +<li>Acquire the mutex when peripheral access is required: <div class="fragment"><div class="line"><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>(uart_mutex_id, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>);</div> +</div><!-- fragment --></li> +<li>When finished with the peripheral access, release the mutex: <div class="fragment"><div class="line"><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>(uart_mutex_id);</div> +</div><!-- fragment --> </li> +</ol> +<h2 class="groupheader">Macro Definition Documentation</h2> +<a class="anchor" id="ga1122a86faa64b4a0880c76cf68d0c934"></a> +<div class="memitem"> +<div class="memproto"> + <table class="memname"> + <tr> + <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> +<dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osMutex</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl> + +</div> +</div> +<a class="anchor" id="ga9b522438489d7c402c95332b58bc94f3"></a> +<div class="memitem"> +<div class="memproto"> + <table class="memname"> + <tr> + <td class="memname">#define osMutexDef</td> + <td>(</td> + <td class="paramtype"> </td> + <td class="paramname">name</td><td>)</td> + <td>   const <a class="el" href="structos_mutex_def__t.html">osMutexDef_t</a> os_mutex_def_##name = { 0 }</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> +<dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osMutexDef</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl> + +</div> +</div> +<h2 class="groupheader">Function Documentation</h2> +<a class="anchor" id="ga5c9de56e717016e39e788064e9a291cc"></a> +<div class="memitem"> +<div class="memproto"> + <table class="memname"> + <tr> + <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> +<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMutexCreate</b> shall be consistent in every CMSIS-RTOS.</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>Code 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> +</div><!-- fragment --> +</div> +</div> +<a class="anchor" id="gac27e24135185d51d18f3dabc20910219"></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> 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> +<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMutexDelete</b> shall be consistent in every CMSIS-RTOS.</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>Code 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> +<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMutexRelease</b> shall be consistent in every CMSIS-RTOS.</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>Code 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> +<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMutexWait</b> shall be consistent in every CMSIS-RTOS.</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>Code 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> +</div><!-- fragment --> +</div> +</div> +</div><!-- contents --> +</div><!-- doc-content --> +<!-- start footer part --> +<div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> + <ul> + <li class="footer">Generated on Tue Oct 27 2015 14:35:43 for CMSIS-RTOS by ARM Ltd. All rights reserved. + <!-- + <a href="http://www.doxygen.org/index.html"> + <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.2 + --> + </li> + </ul> +</div> +</body> +</html> |