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| <div class="section" id="mutex"> |
| <h1>Mutex<a class="headerlink" href="#mutex" title="Permalink to this headline">¶</a></h1> |
| <p>Mutex is short for “mutual exclusion”; a mutex provides mutually |
| exclusive access to a shared resource. A mutex provides <em>priority |
| inheritance</em> in order to prevent <em>priority inversion</em>. Priority |
| inversion occurs when a higher priority task is waiting on a resource |
| owned by a lower priority task. Using a mutex, the lower priority task |
| will inherit the highest priority of any task waiting on the mutex.</p> |
| <div class="section" id="description"> |
| <h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> |
| <p>The first order of business when using a mutex is to declare the mutex |
| globally. The mutex needs to be initialized before it is used (see the |
| examples). It is generally a good idea to initialize the mutex before |
| tasks start running in order to avoid a task possibly using the mutex |
| before it is initialized.</p> |
| <p>When a task wants exclusive access to a shared resource it needs to |
| obtain the mutex by calling <a class="reference internal" href="#c.os_mutex_pend" title="os_mutex_pend"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_mutex_pend()</span></code></a>. If the mutex is currently |
| owned by a different task (a lower priority task), the requesting task |
| will be put to sleep and the owners priority will be elevated to the |
| priority of the requesting task. Note that multiple tasks can request |
| ownership and the current owner is elevated to the highest priority of |
| any task waitin on the mutex. When the task is done using the shared |
| resource, it needs to release the mutex by called <a class="reference internal" href="#c.os_mutex_release" title="os_mutex_release"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_mutex_release()</span></code></a>. |
| There needs to be one release per call to pend. Note that nested calls |
| to <a class="reference internal" href="#c.os_mutex_pend" title="os_mutex_pend"><code class="xref c c-func docutils literal notranslate"><span class="pre">os_mutex_pend()</span></code></a> are allowed but there needs to be one release per |
| pend.</p> |
| <p>The following example will illustrate how priority inheritance works. In |
| this example, the task number is the same as its priority. Remember that |
| the lower the number, the higher the priority (i.e. priority 0 is higher |
| priority than priority 1). Suppose that task 5 gets ownership of a mutex |
| but is preempted by task 4. Task 4 attempts to gain ownership of the |
| mutex but cannot as it is owned by task 5. Task 4 is put to sleep and |
| task 5 is temporarily raised to priority 4. Before task 5 can release |
| the mutex, task 3 runs and attempts to acquire the mutex. At this point, |
| both task 3 and task 4 are waiting on the mutex (sleeping). Task 5 now |
| runs at priority 3 (the highest priority of all the tasks waiting on the |
| mutex). When task 5 finally releases the mutex it will be preempted as |
| two higher priority tasks are waiting for it.</p> |
| <p>Note that when multiple tasks are waiting on a mutex owned by another |
| task, once the mutex is released the highest priority task waiting on |
| the mutex is run.</p> |
| </div> |
| <div class="section" id="api"> |
| <h2>API<a class="headerlink" href="#api" title="Permalink to this headline">¶</a></h2> |
| <dl class="c var"> |
| <dt id="c._pad"> |
| <span class="target" id="group___o_s_mutex_1ga57ebc843a2abfdfb150484709f8c918b"></span><span class="pre">uint8_t</span> <code class="sig-name descname"><span class="pre">_pad</span></code><a class="headerlink" href="#c._pad" title="Permalink to this definition">¶</a><br /></dt> |
| <dd></dd></dl> |
| |
| <dl class="c var"> |
| <dt id="c.mu_prio"> |
| <span class="target" id="group___o_s_mutex_1gab11db74bc914d330188ec8cf6b7ccda1"></span><span class="pre">uint8_t</span> <code class="sig-name descname"><span class="pre">mu_prio</span></code><a class="headerlink" href="#c.mu_prio" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Mutex owner’s default priority. </p> |
| </dd></dl> |
| |
| <dl class="c var"> |
| <dt id="c.mu_level"> |
| <span class="target" id="group___o_s_mutex_1ga3f5cb3a993b3d3ceae9c9a3050cf7e0e"></span><span class="pre">uint16_t</span> <code class="sig-name descname"><span class="pre">mu_level</span></code><a class="headerlink" href="#c.mu_level" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Mutex call nesting level. </p> |
| </dd></dl> |
| |
| <dl class="c var"> |
| <dt id="c.mu_owner"> |
| <span class="target" id="group___o_s_mutex_1gad7f904991f57f1289b0947da3b3ee339"></span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="../task/task.html#c.os_task" title="os_task"><span class="pre">os_task</span></a> <span class="pre">*</span><code class="sig-name descname"><span class="pre">mu_owner</span></code><a class="headerlink" href="#c.mu_owner" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Task that owns the mutex. </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt> |
| <span class="target" id="group___o_s_mutex_1ga639310579608b2315fdace1a33a51ea7"></span><code class="sig-name descname"><span class="pre">SLIST_HEAD</span> <span class="pre">(,</span> <span class="pre">os_task)</span> <span class="pre">mu_head</span></code></dt> |
| <dd></dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_mutex_init"> |
| <span class="target" id="group___o_s_mutex_1gad40a5e8c7af09d2cbe4bbc1ef88d48dd"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_mutex_init</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_mutex" title="os_mutex"><span class="pre">os_mutex</span></a> <span class="pre">*</span><em><span class="pre">mu</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_mutex_init" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Create a mutex and initialize it. </p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Mutex passed in was NULL. OS_OK no error. </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">mu</span></code>: Pointer to mutex</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_mutex_release"> |
| <span class="target" id="group___o_s_mutex_1ga73b1ca40d62d2e08f6f7bce52e50db30"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_mutex_release</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_mutex" title="os_mutex"><span class="pre">os_mutex</span></a> <span class="pre">*</span><em><span class="pre">mu</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_mutex_release" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Release a mutex. </p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Mutex passed in was NULL. OS_BAD_MUTEX Mutex was not granted to current task (not owner). OS_OK No error </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">mu</span></code>: Pointer to the mutex to be released</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt id="c.os_mutex_pend"> |
| <span class="target" id="group___o_s_mutex_1ga2b28a0d4998fdee4047cf949fed7bab7"></span><span class="pre">os_error_t</span> <code class="sig-name descname"><span class="pre">os_mutex_pend</span></code><span class="sig-paren">(</span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="#c.os_mutex" title="os_mutex"><span class="pre">os_mutex</span></a> <span class="pre">*</span><em><span class="pre">mu</span></em>, <span class="pre">uint32_t</span> <em><span class="pre">timeout</span></em><span class="sig-paren">)</span><a class="headerlink" href="#c.os_mutex_pend" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Pend (wait) for a mutex. </p> |
| <p><dl class="simple"> |
| <dt><strong>Return</strong></dt><dd><p>os_error_t OS_INVALID_PARM Mutex passed in was NULL. OS_TIMEOUT Mutex was owned by another task and timeout=0 OS_OK no error. </p> |
| </dd> |
| <dt><strong>Parameters</strong></dt><dd><ul class="breatheparameterlist simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">mu</span></code>: Pointer to mutex. </p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">timeout</span></code>: Timeout, in os ticks. A timeout of 0 means do not wait if not available. A timeout of 0xFFFFFFFF means wait forever.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd></dl> |
| |
| <dl class="c struct"> |
| <dt id="c.os_mutex"> |
| <span class="target" id="structos__mutex"></span><em class="property"><span class="pre">struct</span> </em><code class="sig-name descname"><span class="pre">os_mutex</span></code><a class="headerlink" href="#c.os_mutex" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><em>#include <os_mutex.h></em><p>OS mutex structure. </p> |
| <div class="breathe-sectiondef docutils container"> |
| <p class="breathe-sectiondef-title rubric" id="breathe-section-title-public-members">Public Members</p> |
| <dl class="c var"> |
| <dt id="c.os_mutex.mu_prio"> |
| <span class="target" id="group___o_s_mutex_1gab11db74bc914d330188ec8cf6b7ccda1"></span><span class="pre">uint8_t</span> <code class="sig-name descname"><span class="pre">mu_prio</span></code><a class="headerlink" href="#c.os_mutex.mu_prio" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Mutex owner’s default priority. </p> |
| </dd></dl> |
| |
| <dl class="c var"> |
| <dt id="c.os_mutex.mu_level"> |
| <span class="target" id="group___o_s_mutex_1ga3f5cb3a993b3d3ceae9c9a3050cf7e0e"></span><span class="pre">uint16_t</span> <code class="sig-name descname"><span class="pre">mu_level</span></code><a class="headerlink" href="#c.os_mutex.mu_level" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Mutex call nesting level. </p> |
| </dd></dl> |
| |
| <dl class="c var"> |
| <dt id="c.os_mutex.mu_owner"> |
| <span class="target" id="group___o_s_mutex_1gad7f904991f57f1289b0947da3b3ee339"></span><em class="property"><span class="pre">struct</span></em> <a class="reference internal" href="../task/task.html#c.os_task" title="os_task"><span class="pre">os_task</span></a> <span class="pre">*</span><code class="sig-name descname"><span class="pre">mu_owner</span></code><a class="headerlink" href="#c.os_mutex.mu_owner" title="Permalink to this definition">¶</a><br /></dt> |
| <dd><p>Task that owns the mutex. </p> |
| </dd></dl> |
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