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| |
| <section id="mutual-exclusion-lock"> |
| <h1>Mutual Exclusion lock<a class="headerlink" href="#mutual-exclusion-lock" title="Permalink to this heading"></a></h1> |
| <section id="nxmutex"> |
| <h2>nxmutex<a class="headerlink" href="#nxmutex" title="Permalink to this heading"></a></h2> |
| <p>Use <cite>nxmutex</cite> prefixed api to protect resources. In fact, nxmutex is implemented |
| based on nxsem. The difference between nxmutex and nxsem is that nxmutex supports |
| priority inheritance by default, nxsem do not support priority inheritance by default.</p> |
| <section id="typical-usage"> |
| <h3>Typical Usage<a class="headerlink" href="#typical-usage" title="Permalink to this heading"></a></h3> |
| <p>Call nxmutex_init() for driver, when two tasks will use driver, their timing will be:</p> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>taskA</p></th> |
| <th class="head"><p>taskB</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>nxmutex_lock()</p></td> |
| <td><p>nxmutex_lock()</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>get lock running</p></td> |
| <td><p>wait for lock</p></td> |
| </tr> |
| <tr class="row-even"><td><p>nxmutex_unlock()</p></td> |
| <td><p>wait for lock</p></td> |
| </tr> |
| <tr class="row-odd"><td><ul class="simple"> |
| <li></li> |
| </ul> |
| </td> |
| <td><p>get lock running</p></td> |
| </tr> |
| <tr class="row-even"><td><ul class="simple"> |
| <li></li> |
| </ul> |
| </td> |
| <td><p>nxmutex_unlock()</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
| </section> |
| <section id="priority-inheritance"> |
| <h2>Priority inheritance<a class="headerlink" href="#priority-inheritance" title="Permalink to this heading"></a></h2> |
| <p>If <cite>CONFIG_PRIORITY_INHERITANCE</cite> is chosen, the priority of the task holding the mutex |
| may be changed. |
| This is an example:</p> |
| <blockquote> |
| <div><p>There are three tasks. Their priorities are high, medium, and low. |
| We refer to them as <cite>Htask</cite> <cite>Mtask</cite> <cite>Ltask</cite></p> |
| <p><cite>Htask</cite> and <cite>Ltask</cite> will hold the same mutex. <cite>Mtask</cite> does not hold mutex</p> |
| </div></blockquote> |
| <dl class="simple"> |
| <dt>if <cite>CONFIG_PRIORITY_INHERITANCE</cite> is not chosen, task running order</dt><dd><ol class="arabic simple"> |
| <li><p><cite>Ltask</cite> hold a mutex first</p></li> |
| <li><p>Then <cite>Htask</cite> running, <cite>Htask</cite> can’t hold the mutex,so wait</p></li> |
| <li><p>Then <cite>Mtask</cite> running, because <cite>Mtask</cite> priority higher than <cite>Ltask</cite>.</p></li> |
| <li><p>When <cite>Mtask</cite> finish, <cite>Ltask</cite> will start running.</p></li> |
| <li><p>When <cite>Ltask</cite> finish, <cite>Htask</cite> will start running.</p></li> |
| </ol> |
| </dd> |
| </dl> |
| <p>From the above process, we can see that the medium-priority tasks run ahead of |
| the high-priority tasks, which is unacceptable.</p> |
| <dl class="simple"> |
| <dt>if <cite>CONFIG_PRIORITY_INHERITANCE</cite> is chosen, task running order</dt><dd><ol class="arabic simple"> |
| <li><p><cite>Ltask</cite> hold a mutex first.</p></li> |
| <li><p>Then <cite>Htask</cite> running, <cite>Htask</cite> can’t hold the mutex, then boost the priority of <cite>Ltask</cite></p></li> |
| </ol> |
| </dd> |
| <dt>to be the same as <cite>Htask</cite>.</dt><dd><ol class="arabic simple"> |
| <li><p>Because <cite>Ltask</cite> priority is higher than <cite>Mtask</cite>,so <cite>Mtask</cite> not running.</p></li> |
| <li><p>When ‘Ltask’ finish, <cite>Htask</cite> will start running.</p></li> |
| <li><p>When <cite>Htask</cite> finish, <cite>Mtask</cite> will start running.</p></li> |
| </ol> |
| </dd> |
| </dl> |
| <p>Priority inheritance prevents medium-priority tasks from running ahead of |
| high-priority tasks</p> |
| </section> |
| <section id="api-description"> |
| <h2>Api description<a class="headerlink" href="#api-description" title="Permalink to this heading"></a></h2> |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_init"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_init</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_init" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function initialize the UNNAMED mutex |
| :param mutex: mutex to be initialized.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Returns<span class="colon">:</span></dt> |
| <dd class="field-odd"><p>Zero(OK) is returned on success.A negated errno value is returned on failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_destroy"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_destroy</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_destroy" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function destroy the UNNAMED mutex |
| :param mutex: mutex to be destroyed.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Returns<span class="colon">:</span></dt> |
| <dd class="field-odd"><p>Zero(OK) is returned on success.A negated errno value is returned on failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_lock"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_lock</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_lock" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function attempts to lock the mutex referenced by ‘mutex’. The |
| mutex is implemented with a semaphore, so if the semaphore value is |
| (<=) zero, then the calling task will not return until it successfully |
| acquires the lock.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>mutex</strong> – mutex descriptor.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p>Zero(OK) is returned on success.A negated errno value is returned on failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_trylock"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_trylock</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_trylock" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function locks the mutex only if the mutex is currently not locked. |
| If the mutex has been locked already, the call returns without blocking.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>mutex</strong> – mutex descriptor.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p><p>Zero(OK) is returned on success.A negated errno value is returned on failure. |
| Possible returned errors:</p> |
| <p>EINVAL - Invalid attempt to lock the mutex |
| EAGAIN - The mutex is not available.</p> |
| </p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_is_locked"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_is_locked</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_is_locked" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function get the lock state the mutex referenced by ‘mutex’.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>mutex</strong> – mutex descriptor.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p>if mutex is locked will return <cite>true</cite>. if not will return <cite>false</cite></p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_unlock"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_unlock</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_unlock" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function attempts to unlock the mutex referenced by ‘mutex’.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>mutex</strong> – mutex descriptor.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p>Zero(OK) is returned on success.A negated errno value is returned on failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.nxmutex_reset"> |
| <span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">nxmutex_reset</span></span></span><span class="sig-paren">(</span><span class="pre">FAR</span><span class="w"> </span><span class="n"><span class="pre">mutex_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n"><span class="pre">mutex</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.nxmutex_reset" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>This function resets mutex states by ‘mutex’.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>mutex</strong> – mutex descriptor.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p>Zero(OK) is returned on success.A negated errno value is returned on failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
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