<!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>Signal Events</title> <title>CMSIS-RTOS: Signal Events</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 href="navtree.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="resize.js"></script> <script type="text/javascript" src="navtree.js"></script> <script type="text/javascript"> $(document).ready(initResizable); $(window).load(resizeHeight); </script> <link href="search/search.css" rel="stylesheet" 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<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__CMSIS__RTOS__SignalMgmt.html','');}); </script> <div id="doc-content"> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> <a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" 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class="SelectionMark"> </span>Pages</a></div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <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">Signal Events<div class="ingroups"><a class="el" href="group__CMSIS__RTOS__InterThread.html">Inter-Thread Communication and Resource Sharing</a></div></div> </div> </div><!--header--> <div class="contents"> <p>Synchronize threads using signals. <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:ga01edde265710d883b6e237d34a6ef4a6"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga01edde265710d883b6e237d34a6ef4a6">osFeature_Signals</a>   8</td></tr> <tr class="memdesc:ga01edde265710d883b6e237d34a6ef4a6"><td class="mdescLeft"> </td><td class="mdescRight">maximum number of Signal Flags available per thread <a href="#ga01edde265710d883b6e237d34a6ef4a6">More...</a><br/></td></tr> <tr class="separator:ga01edde265710d883b6e237d34a6ef4a6"><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:ga3de2730654589d6c3559c4b9e2825553"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga3de2730654589d6c3559c4b9e2825553">osSignalSet</a> (<a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id, int32_t signals)</td></tr> <tr class="memdesc:ga3de2730654589d6c3559c4b9e2825553"><td class="mdescLeft"> </td><td class="mdescRight">Set the specified Signal Flags of an active thread. <a href="#ga3de2730654589d6c3559c4b9e2825553">More...</a><br/></td></tr> <tr class="separator:ga3de2730654589d6c3559c4b9e2825553"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga87283a6ebc31ce9ed42baf3ea7e4eab6"><td class="memItemLeft" align="right" valign="top">int32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga87283a6ebc31ce9ed42baf3ea7e4eab6">osSignalClear</a> (<a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id, int32_t signals)</td></tr> <tr class="memdesc:ga87283a6ebc31ce9ed42baf3ea7e4eab6"><td class="mdescLeft"> </td><td class="mdescRight">Clear the specified Signal Flags of an active thread. <a href="#ga87283a6ebc31ce9ed42baf3ea7e4eab6">More...</a><br/></td></tr> <tr class="separator:ga87283a6ebc31ce9ed42baf3ea7e4eab6"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga38860acda96df47da6923348d96fc4c9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#structosEvent">osEvent</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</a> (int32_t signals, uint32_t millisec)</td></tr> <tr class="memdesc:ga38860acda96df47da6923348d96fc4c9"><td class="mdescLeft"> </td><td class="mdescRight">Wait for one or more Signal Flags to become signaled for the current <b>RUNNING</b> thread. <a href="#ga38860acda96df47da6923348d96fc4c9">More...</a><br/></td></tr> <tr class="separator:ga38860acda96df47da6923348d96fc4c9"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Description</h2> <p>Signals are used to trigger execution states between threads. The signal management functions in CMSIS-RTOS allow you to control or wait for signal flags. Each thread has up to 31 assigned signal flags. The maximum number of signal flags is defined in the <a class="el" href="cmsis__os_8h.html">cmsis_os.h</a> file (<b>#define osFeature_Signals</b>).</p> <p>A thread</p> <ul> <li>can wait for signals to be set (using <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</a>). Using this function, it enters the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">WAITING</a> state. The <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</a> parameter <em>signals</em> defines the signals that are required to put the thread back into <b>READY</b> state.</li> <li>may set one or more flags in any other given thread (using <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga3de2730654589d6c3559c4b9e2825553">osSignalSet</a>).</li> <li>may clear its own signals or the signals of other threads (using <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga87283a6ebc31ce9ed42baf3ea7e4eab6">osSignalClear</a>).</li> </ul> <p>When a thread wakes up and resumes execution, its signal flags are automatically cleared.</p> <h2>Working with Signals </h2> <p>Here is a simple example that shows how two thread can communicate with each others using signals:</p> <div class="image"> <img src="simple_signal.png" alt="simple_signal.png"/> <div class="caption"> Simple signal event communication</div></div> <p> The following steps are required to use signals:</p> <ol type="1"> <li>In the thread (for example thread ID <code>tid_thread1</code>) that is supposed to wait for a signal, call the wait function: <div class="fragment"><div class="line"><a class="code" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</a> (0x0001, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb">osWaitForever</a>); <span class="comment">// wait forever for the signal 0x0001</span></div> </div><!-- fragment --></li> <li>In another thread (or threads) that are supposed to wake the waiting thread up call: <div class="fragment"><div class="line"><a class="code" href="group__CMSIS__RTOS__SignalMgmt.html#ga3de2730654589d6c3559c4b9e2825553">osSignalSet</a> (tid_thread1, 0x0001); <span class="comment">// set the signal 0x0001 for thread tid_thread1</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__Wait.html#ga02e19d5e723bfb06ba9324d625162255">osDelay</a> (1000); <span class="comment">// wait for 1 second</span></div> </div><!-- fragment --> </li> </ol> <h2 class="groupheader">Macro Definition Documentation</h2> <a class="anchor" id="ga01edde265710d883b6e237d34a6ef4a6"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define osFeature_Signals   8</td> </tr> </table> </div><div class="memdoc"> <p>The CMSIS-RTOS API may support a variable number of signal flags. This define specifies the number of signal flags available per thread. The maximum value is 32 signal flags per thread.</p> <p><a class="el" href="rtxImplementation.html">CMSIS-RTOS RTX</a> Setting: <b>osFeature_Signals</b> is 16 </p> </div> </div> <h2 class="groupheader">Function Documentation</h2> <a class="anchor" id="ga87283a6ebc31ce9ed42baf3ea7e4eab6"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int32_t osSignalClear </td> <td>(</td> <td class="paramtype"><a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> </td> <td class="paramname"><em>thread_id</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int32_t </td> <td class="paramname"><em>signals</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">thread_id</td><td>thread ID obtained by <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> or <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gab1df2a28925862ef8f9cf4e1c995c5a7">osThreadGetId</a>. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">signals</td><td>specifies the signal flags of the thread that shall be cleared. </td></tr> </table> </dd> </dl> <dl class="section return"><dt>Returns</dt><dd>previous signal flags of the specified thread or 0x80000000 in case of incorrect parameters or call from ISR. </dd></dl> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osSignalClear</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Clear the signal flags of an active thread.</p> <dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="functionOverview.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="keywordtype">void</span> Thread_2 (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg);</div> <div class="line"></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaee93d929beb350f16e5cc7fa602e229f">osThreadDef</a> (Thread_2, <a class="code" href="cmsis__os_8h.html#ga7f2b42f1983b9107775ec2a1c69a849aa914433934143a9ba767e59577c56e6c2">osPriorityHigh</a>, 1, 0);</div> <div class="line"> </div> <div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> EX_Signal_1 (<span class="keywordtype">void</span>) {</div> <div class="line"> int32_t signals;</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id;</div> <div class="line"> </div> <div class="line"> thread_id = <a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> (<a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453">osThread</a>(Thread_2), NULL);</div> <div class="line"> <span class="keywordflow">if</span> (thread_id == NULL) {</div> <div class="line"> <span class="comment">// Failed to create a thread.</span></div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">else</span> {</div> <div class="line">f :</div> <div class="line"> signals = <a class="code" href="group__CMSIS__RTOS__SignalMgmt.html#ga87283a6ebc31ce9ed42baf3ea7e4eab6">osSignalClear</a> (thread_id, 0x01);</div> <div class="line"> }</div> <div class="line">}</div> </div><!-- fragment --> </div> </div> <a class="anchor" id="ga3de2730654589d6c3559c4b9e2825553"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int32_t osSignalSet </td> <td>(</td> <td class="paramtype"><a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> </td> <td class="paramname"><em>thread_id</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int32_t </td> <td class="paramname"><em>signals</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">thread_id</td><td>thread ID obtained by <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> or <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#gab1df2a28925862ef8f9cf4e1c995c5a7">osThreadGetId</a>. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">signals</td><td>specifies the signal flags of the thread that should be set. </td></tr> </table> </dd> </dl> <dl class="section return"><dt>Returns</dt><dd>previous signal flags of the specified thread or 0x80000000 in case of incorrect parameters. </dd></dl> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osSignalSet</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Set the signal flags of an active thread. This function may be used also within interrupt service routines.</p> <dl class="section note"><dt>Note</dt><dd><a class="el" href="functionOverview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a> can call this function.</dd></dl> <p><b>Code Example</b> </p> <div class="fragment"><div class="line"><span class="keywordtype">void</span> Thread_2 (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg);</div> <div class="line"> </div> <div class="line"><a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaee93d929beb350f16e5cc7fa602e229f">osThreadDef</a> (Thread_2, <a class="code" href="cmsis__os_8h.html#ga7f2b42f1983b9107775ec2a1c69a849aa914433934143a9ba767e59577c56e6c2">osPriorityHigh</a>, 1, 0);</div> <div class="line"> </div> <div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> EX_Signal_1 (<span class="keywordtype">void</span>) {</div> <div class="line"> int32_t signals;</div> <div class="line"> uint32_t exec;</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id;</div> <div class="line"> </div> <div class="line"> thread_id = <a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> (<a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453">osThread</a>(Thread_2), NULL);</div> <div class="line"> <span class="keywordflow">if</span> (thread_id == NULL) {</div> <div class="line"> <span class="comment">// Failed to create a thread.</span></div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">else</span> {</div> <div class="line"> signals = <a class="code" href="group__CMSIS__RTOS__SignalMgmt.html#ga3de2730654589d6c3559c4b9e2825553">osSignalSet</a> (thread_id, 0x00000005); <span class="comment">// Send signals to the created thread</span></div> <div class="line"> }</div> <div class="line">}</div> </div><!-- fragment --> </div> </div> <a class="anchor" id="ga38860acda96df47da6923348d96fc4c9"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#structosEvent">osEvent</a> osSignalWait </td> <td>(</td> <td class="paramtype">int32_t </td> <td class="paramname"><em>signals</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">signals</td><td>wait until all specified signal flags set or 0 for any single signal flag. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="functionOverview.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>event flag information or error code. </dd></dl> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osSignalWait</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Suspend the execution of the current <b>RUNNING</b> thread until all specified signal flags with the parameter <em>signals</em> are set. When the parameter <em>signals</em> is 0 the current <b>RUNNING</b> thread is suspended until any signal is set. When these signal flags are already set, the function returns instantly. Otherwise the thread is put into the state <b>WAITING</b>. Signal flags that are reported as event are automatically cleared.</p> <p>The argument <em>millisec</em> specifies how long the system waits for the specified signal flags. While the system waits the tread calling this function is put into the state <b>WAITING</b>. The timeout value 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 a specified signal is set.</li> <li>all other values specify a time in millisecond for a timeout.</li> </ul> <p><b><a class="el" href="group__CMSIS__RTOS__Status.html">Status and Error Codes</a></b><br/> </p> <ul> <li><em>osOK:</em> no signal received when the timeout value <em>millisec</em> was 0.</li> <li><em>osEventTimeout:</em> signal not occurred within timeout</li> <li><em>osEventSignal:</em> signal occurred, <em>value.signals</em> contains the signal flags; these signal flags are cleared.</li> <li><em>osErrorValue:</em> the value <em>signals</em> is outside of the permitted range.</li> <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</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="functionOverview.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="keywordtype">void</span> Thread_2 (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg);</div> <div class="line"> </div> <div class="line"><a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaee93d929beb350f16e5cc7fa602e229f">osThreadDef</a> (Thread_2, <a class="code" href="cmsis__os_8h.html#ga7f2b42f1983b9107775ec2a1c69a849aa914433934143a9ba767e59577c56e6c2">osPriorityHigh</a>, 1, 0);</div> <div class="line"> </div> <div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> EX_Signal_1 (<span class="keywordtype">void</span>) {</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id;</div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__Definitions.html#structosEvent">osEvent</a> evt;</div> <div class="line"> </div> <div class="line"> thread_id = <a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> (<a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453">osThread</a>(Thread_2), NULL);</div> <div class="line"> <span class="keywordflow">if</span> (thread_id == NULL) {</div> <div class="line"> <span class="comment">// Failed to create a thread.</span></div> <div class="line"> }</div> <div class="line"> <span class="keywordflow">else</span> {</div> <div class="line"> :</div> <div class="line"> <span class="comment">// wait for a signal</span></div> <div class="line"> evt = <a class="code" href="group__CMSIS__RTOS__SignalMgmt.html#ga38860acda96df47da6923348d96fc4c9">osSignalWait</a> (0x01, 100);</div> <div class="line"> <span class="keywordflow">if</span> (evt.<a class="code" href="group__CMSIS__RTOS__Definitions.html#ad477a289f1f03ac45407b64268d707d3">status</a> == <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99ea5df7e9643aa8a2f5f3a6f6ec59758518">osEventSignal</a>) {</div> <div class="line"> <span class="comment">// handle event status</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 Wed Feb 8 2017 10:21:02 for CMSIS-RTOS by ARM Ltd. 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