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  <div class="headertitle"><div class="title">tk::Semaphore クラス</div></div>
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<p>計数セマフォ (Counting <a class="el" href="classtk_1_1_semaphore.html" title="計数セマフォ (Counting Semaphore) / バイナリセマフォ">Semaphore</a>) / バイナリセマフォ  
 <a href="#details">[詳解]</a></p>

<p><code>#include &lt;<a class="el" href="sync_8hpp_source.html">sync.hpp</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-pub-methods" class="groupheader"><a id="pub-methods" name="pub-methods"></a>
公開メンバ関数</h2></td></tr>
<tr class="memitem:a66c5ac90338a6fcc6a9c2f22f1586de8" id="r_a66c5ac90338a6fcc6a9c2f22f1586de8"><td class="memItemLeft">&#160;</td><td class="memItemRight"><a class="el" href="#a66c5ac90338a6fcc6a9c2f22f1586de8">Semaphore</a> (int32_t initial_count=1, int32_t max_count=1)</td></tr>
<tr class="memdesc:a66c5ac90338a6fcc6a9c2f22f1586de8"><td class="mdescLeft">&#160;</td><td class="mdescRight">セマフォを初期化します  <br /></td></tr>
<tr class="memitem:a863ccee07bc701a78342c14503955d73" id="r_a863ccee07bc701a78342c14503955d73"><td class="memItemLeft">void&#160;</td><td class="memItemRight"><a class="el" href="#a863ccee07bc701a78342c14503955d73">acquire</a> ()</td></tr>
<tr class="memdesc:a863ccee07bc701a78342c14503955d73"><td class="mdescLeft">&#160;</td><td class="mdescRight">資源を獲得するまで現在のタスクをブロックします  <br /></td></tr>
<tr class="memitem:a3a246c8afc866dc438186d0a53cad5c2" id="r_a3a246c8afc866dc438186d0a53cad5c2"><td class="memItemLeft">bool&#160;</td><td class="memItemRight"><a class="el" href="#a3a246c8afc866dc438186d0a53cad5c2">try_acquire</a> ()</td></tr>
<tr class="memdesc:a3a246c8afc866dc438186d0a53cad5c2"><td class="mdescLeft">&#160;</td><td class="mdescRight">資源の獲得を試みます (ノンブロッキング)  <br /></td></tr>
<tr class="memitem:a7bb8eb8b0bd69b2f6b0a4d89d0f5b07b" id="r_a7bb8eb8b0bd69b2f6b0a4d89d0f5b07b"><td class="memItemLeft">void&#160;</td><td class="memItemRight"><a class="el" href="#a7bb8eb8b0bd69b2f6b0a4d89d0f5b07b">release</a> ()</td></tr>
<tr class="memdesc:a7bb8eb8b0bd69b2f6b0a4d89d0f5b07b"><td class="mdescLeft">&#160;</td><td class="mdescRight">資源を返却し、待機中タスクがあれば最優先度のタスクを 1 つ起床させます  <br /></td></tr>
<tr class="memitem:ae53b9c57cc25fafb242a21776f112701" id="r_ae53b9c57cc25fafb242a21776f112701"><td class="memItemLeft">int32_t&#160;</td><td class="memItemRight"><a class="el" href="#ae53b9c57cc25fafb242a21776f112701">count</a> () const</td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">詳解</h2>
<div class="textblock"><p>計数セマフォ (Counting <a class="el" href="classtk_1_1_semaphore.html" title="計数セマフォ (Counting Semaphore) / バイナリセマフォ">Semaphore</a>) / バイナリセマフォ </p>
<p>資源の獲得・返却によるタスク間同期を行います。資源がない場合はタスクが <span class="tt">State::Blocked</span> に遷移して休止し、返却時に優先度の高いタスクから順に起床します。</p>
<div class="fragment"><div class="line"><a class="code hl_class" href="classtk_1_1_semaphore.html">tk::Semaphore</a> sem(0, 5); <span class="comment">// 初期値0、最大5</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">// タスク側 (資源が空くまでブロック待機)</span></div>
<div class="line">sem.acquire();</div>
<div class="line"> </div>
<div class="line"><span class="comment">// シグナル送信側 (割り込みや他タスクから返却・通知)</span></div>
<div class="line">sem.release();</div>
<div class="ttc" id="aclasstk_1_1_semaphore_html"><div class="ttname"><a href="classtk_1_1_semaphore.html">tk::Semaphore</a></div><div class="ttdoc">計数セマフォ (Counting Semaphore) / バイナリセマフォ</div><div class="ttdef"><b>定義</b> sync.hpp:24</div></div>
</div><!-- fragment --> </div><a name="doc-constructors" id="doc-constructors"></a><h2 id="header-doc-constructors" class="groupheader">構築子と解体子</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a66c5ac90338a6fcc6a9c2f22f1586de8">&#9670;&#160;</a></span>Semaphore()</h2>

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          <td class="memname">tk::Semaphore::Semaphore </td>
          <td>(</td>
          <td class="paramtype">int32_t</td>          <td class="paramname"><span class="paramname"><em>initial_count</em></span><span class="paramdefsep"> = </span><span class="paramdefval">1</span>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int32_t</td>          <td class="paramname"><span class="paramname"><em>max_count</em></span><span class="paramdefsep"> = </span><span class="paramdefval">1</span>&#160;)</td>
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<span class="mlabels"><span class="mlabel inline">inline</span><span class="mlabel explicit">explicit</span></span>  </td>
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<p>セマフォを初期化します </p>
<dl class="params"><dt>引数</dt><dd>
  <table class="params">
    <tr><td class="paramname">initial_count</td><td>初期資源カウント (省略時: 1) </td></tr>
    <tr><td class="paramname">max_count</td><td>最大資源カウント (省略時: 1) </td></tr>
  </table>
  </dd>
</dl>

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<a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">関数詳解</h2>
<a id="a863ccee07bc701a78342c14503955d73" name="a863ccee07bc701a78342c14503955d73"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a863ccee07bc701a78342c14503955d73">&#9670;&#160;</a></span>acquire()</h2>

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          <td class="memname">void tk::Semaphore::acquire </td>
          <td>(</td>
          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td></td>
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<p>資源を獲得するまで現在のタスクをブロックします </p>
<p>資源カウントが 0 以下の場合はタスクが休止状態になり、CPU は他タスクへ譲渡されます (CPU消費ゼロ)。 </p>

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<a id="ae53b9c57cc25fafb242a21776f112701" name="ae53b9c57cc25fafb242a21776f112701"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae53b9c57cc25fafb242a21776f112701">&#9670;&#160;</a></span>count()</h2>

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          <td class="memname">int32_t tk::Semaphore::count </td>
          <td>(</td>
          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td> const</td>
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<p>現在の資源カウントを取得 </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a7bb8eb8b0bd69b2f6b0a4d89d0f5b07b">&#9670;&#160;</a></span>release()</h2>

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          <td class="memname">void tk::Semaphore::release </td>
          <td>(</td>
          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td></td>
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<p>資源を返却し、待機中タスクがあれば最優先度のタスクを 1 つ起床させます </p>

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<a id="a3a246c8afc866dc438186d0a53cad5c2" name="a3a246c8afc866dc438186d0a53cad5c2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a3a246c8afc866dc438186d0a53cad5c2">&#9670;&#160;</a></span>try_acquire()</h2>

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          <td class="memname">bool tk::Semaphore::try_acquire </td>
          <td>(</td>
          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td></td>
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<p>資源の獲得を試みます (ノンブロッキング) </p>
<dl class="section return"><dt>戻り値</dt><dd>true 獲得成功 (カウントが 1 減算された) </dd>
<dd>
false 資源がないため獲得失敗 (ブロックせず即座に復帰) </dd></dl>

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<hr/>このクラス詳解は次のファイルから抽出されました:<ul>
<li>C:/Users/yoneda/Documents/Pico_Projects/tinykernel/tinykernel/include/tinykernel/<a class="el" href="sync_8hpp_source.html">sync.hpp</a></li>
</ul>
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