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   <div id="projectbrief">CMSIS-RTOS API: Generic RTOS interface for Cortex-M processor-based devices.</div>
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<div class="title">Header File Template: <a class="el" href="cmsis__os_8h.html">cmsis_os.h</a> </div>  </div>
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<div class="textblock"><p>The file <b><a class="el" href="cmsis__os_8h.html">cmsis_os.h</a></b> is a template header file for a CMSIS-RTOS compliant Real-Time Operating System (RTOS). Each RTOS that is compliant with CMSIS-RTOS shall provide a specific <b><a class="el" href="cmsis__os_8h.html">cmsis_os.h</a></b> header file that represents its implementation.</p>
<p>The file <a class="el" href="cmsis__os_8h.html">cmsis_os.h</a> contains:</p>
<ul>
<li>CMSIS-RTOS API function definitions</li>
<li>struct definitions for parameters and return types</li>
<li>status and priority values used by CMSIS-RTOS API functions</li>
<li>macros for defining threads and other kernel objects</li>
</ul>
<p><b>Name conventions and header file modifications</b></p>
<p>All definitions are prefixed with <b>os</b> to give an unique name space for CMSIS-RTOS functions. Definitions that are prefixed <b>os_</b> are not used in the application code but local to this header file. All definitions and functions that belong to a module are grouped and have a common prefix, i.e. <b>osThread</b>.</p>
<p>Definitions that are marked with <b>CAN BE CHANGED</b> can be adapted towards the needs of the actual CMSIS-RTOS implementation. These definitions can be specific to the underlying RTOS kernel.</p>
<p>Definitions that are marked with <b>MUST REMAIN UNCHANGED</b> cannot be altered. Otherwise the CMSIS-RTOS implementation is no longer compliant to the standard. Note that some functions are optional and need not to be provided by every CMSIS-RTOS implementation.</p>
<p><b>Function calls from interrupt service routines</b></p>
<p>The following CMSIS-RTOS functions can be called from threads and interrupt service routines (ISR):</p>
<ul>
<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___signal_mgmt.html#ga3de2730654589d6c3559c4b9e2825553">osSignalSet</a></li>
<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___semaphore_mgmt.html#gab108914997c49e14d8ff1ae0d1988ca0">osSemaphoreRelease</a></li>
<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html#gaa0b2994f1a866c19e0d11e6e0d44f543">osPoolAlloc</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html#ga9f129fcad4730fbd1048ad4fa262f36a">osPoolCAlloc</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html#ga4a861e9c469c9d0daf5721bf174f8e54">osPoolFree</a></li>
<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___message.html#gac0dcf462fc92de8ffaba6cc004514a6d">osMessagePut</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___message.html#ga6c6892b8f2296cca6becd57ca2d7e1ae">osMessageGet</a></li>
<li><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194">osMailAlloc</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga8fde74f6fe5b9e88f75cc5eb8f2124fd">osMailCAlloc</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gac6ad7e6e7d6c4a80e60da22c57a42ccd">osMailGet</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga485ef6f81854ebda8ffbce4832181e02">osMailPut</a>, <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga27c1060cf21393f96b4fd1ed1c0167cc">osMailFree</a></li>
</ul>
<p>Functions that cannot be called from an ISR are verifying the interrupt status and return in case that they are called from an ISR context the status code <b>osErrorISR</b>. In some implementations this condition might be caught using the HARD FAULT vector.</p>
<p>Some CMSIS-RTOS implementations support CMSIS-RTOS function calls from multiple ISR at the same time. If this is impossible, the CMSIS-RTOS rejects calls by nested ISR functions with the status code <b>osErrorISRRecursive</b>.</p>
<p><b>Define and reference object definitions</b></p>
<p>With <b>#define osObjectsExternal</b> objects are defined as external symbols. This allows to create a consistent header file that is used throughout a project as shown below:</p>
<p><em>Header File</em> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>&gt;</span>                                         <span class="comment">// CMSIS RTOS header file</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// Thread definition</span></div>
<div class="line"><span class="keyword">extern</span> <span class="keywordtype">void</span> thread_sample (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument);             <span class="comment">// function prototype</span></div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaee93d929beb350f16e5cc7fa602e229f" title="Create a Thread Definition with function, priority, and stack requirements.">osThreadDef</a> (thread_sample, <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga7f2b42f1983b9107775ec2a1c69a849aa193b650117c209b4a203954542bcc3e6" title="priority: below normal">osPriorityBelowNormal</a>, 1, 100);</div>
<div class="line"></div>
<div class="line"><span class="comment">// Pool definition</span></div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html#ga87b471d4fe2d5dbd0040708edd52771b" title="Define a Memory Pool.">osPoolDef</a>(MyPool, 10, <span class="keywordtype">long</span>);</div>
</div><!-- fragment --><p>This header file defines all objects when included in a C/C++ source file. When <b>#define osObjectsExternal</b> is present before the header file, the objects are defined as external symbols. A single consistent header file can therefore be used throughout the whole project.</p>
<p><em>Example</em> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;osObjects.h&quot;</span>     <span class="comment">// Definition of the CMSIS-RTOS objects</span></div>
</div><!-- fragment --><div class="fragment"><div class="line"><span class="preprocessor">#define osObjectExternal   // Objects will be defined as external symbols</span></div>
<div class="line"><span class="preprocessor">#include &quot;osObjects.h&quot;     // Reference to the CMSIS-RTOS objects</span></div>
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