{"id":2092,"date":"2025-03-24T08:48:19","date_gmt":"2025-03-23T23:48:19","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=2092"},"modified":"2025-03-24T08:48:46","modified_gmt":"2025-03-23T23:48:46","slug":"c-atomic%e3%81%a7%e5%ae%9f%e7%8f%be%e3%81%99%e3%82%8b%e9%ab%98%e9%80%9f%e3%81%a7%e5%ae%89%e5%85%a8%e3%81%aa%e3%83%9e%e3%83%ab%e3%83%81%e3%82%b9%e3%83%ac%e3%83%83%e3%83%89%e3%83%97%e3%83%ad%e3%82%b0","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=2092","title":{"rendered":"C++ atomic\u3067\u5b9f\u73fe\u3059\u308b\u9ad8\u901f\u3067\u5b89\u5168\u306a\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5165\u9580"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">C++ atomic\u3068\u306f\uff1f\u305d\u306e\u7279\u5fb4\u3068\u91cd\u8981\u6027<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u30c7\u30fc\u30bf\u7af6\u5408\u3092\u9632\u3050atomic\u64cd\u4f5c\u306e\u57fa\u672c\u6982\u5ff5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u5f93\u6765\u306e\u540c\u671f\u6a5f\u69cb\u3068\u6bd4\u8f03\u3057\u305fatomic\u306e\u5229\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">std::atomic\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">atomic\u5909\u6570\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u3067\u5229\u7528\u53ef\u80fd\u306a\u95a2\u6570\u4e00\u89a7<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u6307\u5b9a\u65b9\u6cd5\u3068\u5f71\u97ff<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u7684\u306aatomic\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30ab\u30a6\u30f3\u30bf\u30fc\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u30ed\u30c3\u30af\u30d5\u30ea\u30fc\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u4f5c\u6210\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">atomic\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u9078\u629e\u30df\u30b9\u306b\u3088\u308b\u6027\u80fd\u4f4e\u4e0b<\/a>      <\/li>      <li>        <a href=\"#i-13\">\u904e\u5270\u306a\u4f7f\u7528\u304c\u3082\u305f\u3089\u3059\u8907\u96d1\u6027\u306e\u5897\u52a0<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">\u30c7\u30d0\u30c3\u30b0\u6642\u306e\u6ce8\u610f\u4e8b\u9805\u3068\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-15\">\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306a\u30b2\u30fc\u30e0\u30a8\u30f3\u30b8\u30f3\u3067\u306e\u5229\u7528\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-17\">\u5927\u898f\u6a21\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u65e2\u5b58\u30b3\u30fc\u30c9\u306eatomic\u306b\u3088\u308b\u6700\u9069\u5316\u4e8b\u4f8b<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">C++ atomic\u3068\u306f\uff1f\u305d\u306e\u7279\u5fb4\u3068\u91cd\u8981\u6027<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u30c7\u30fc\u30bf\u7af6\u5408\u3092\u9632\u3050atomic\u64cd\u4f5c\u306e\u57fa\u672c\u6982\u5ff5<\/h3>\n\n\n\n<p>\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001\u6700\u3082\u5384\u4ecb\u306a\u554f\u984c\u306e1\u3064\u304c\u300c\u30c7\u30fc\u30bf\u7af6\u5408\uff08Data Race\uff09\u300d\u3067\u3059\u3002\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u3058\u30e1\u30e2\u30ea\u9818\u57df\u306b\u540c\u6642\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u3001\u4e88\u671f\u305b\u306c\u7d50\u679c\u3084\u4e0d\u5177\u5408\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>C++11\u3067\u5c0e\u5165\u3055\u308c\u305f<code>std::atomic<\/code>\u306f\u3001\u3053\u306e\u30c7\u30fc\u30bf\u7af6\u5408\u3092\u9632\u3050\u305f\u3081\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002atomic\u3068\u306f\u300c\u4e0d\u53ef\u5206\u306a\u300d\u300c\u5206\u5272\u3067\u304d\u306a\u3044\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3001atomic\u64cd\u4f5c\u306f\u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u306e\u5272\u308a\u8fbc\u307f\u306a\u304f\u5b8c\u5168\u306b\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u3001\u30c7\u30fc\u30bf\u7af6\u5408\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\u3068atomic\u3092\u4f7f\u7528\u3057\u3066\u89e3\u6c7a\u3059\u308b\u30b1\u30fc\u30b9\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30fc\u30bf\u7af6\u5408\u304c\u767a\u751f\u3059\u308b\u4f8b\nint shared_counter = 0;\nvoid increment_unsafe() {\n    \/\/ \u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u6642\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u554f\u984c\u767a\u751f\n    shared_counter++;  \/\/ \u8aad\u307f\u53d6\u308a\u2192\u52a0\u7b97\u2192\u66f8\u304d\u8fbc\u307f\u306e3\u30b9\u30c6\u30c3\u30d7\n}\n\n\/\/ atomic\u3092\u4f7f\u7528\u3057\u3066\u5b89\u5168\u306b\u5b9f\u88c5\u3057\u305f\u4f8b\n#include &lt;atomic&gt;\nstd::atomic&lt;int&gt; atomic_counter{0};\nvoid increment_safe() {\n    \/\/ \u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u3068\u3057\u3066\u4e00\u5ea6\u306b\u5b9f\u884c\u3055\u308c\u308b\n    atomic_counter++;  \/\/ \u4e0d\u53ef\u5206\u306a\u64cd\u4f5c\u3068\u3057\u3066\u5b9f\u884c\n}<\/pre>\n\n\n\n<p>atomic\u306e\u91cd\u8981\u306a\u7279\u5fb4\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e0d\u53ef\u5206\u6027\u306e\u4fdd\u8a3c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u64cd\u4f5c\u304c\u9014\u4e2d\u3067\u4e2d\u65ad\u3055\u308c\u308b\u3053\u3068\u304c\u306a\u3044<\/li>\n\n\n\n<li>\u4ed6\u306e\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u306f\u64cd\u4f5c\u306e\u9014\u4e2d\u72b6\u614b\u304c\u898b\u3048\u306a\u3044<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30b5\u30dd\u30fc\u30c8<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u304f\u306eCPU\u304c\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u3092\u76f4\u63a5\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li>\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3088\u308a\u3082\u9ad8\u901f\u306b\u52d5\u4f5c<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9806\u5e8f\u4ed8\u3051\u306e\u4fdd\u8a3c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u3092\u6307\u5b9a\u53ef\u80fd<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u9593\u306e\u540c\u671f\u3092\u7d30\u304b\u304f\u5236\u5fa1\u3067\u304d\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u5f93\u6765\u306e\u540c\u671f\u6a5f\u69cb\u3068\u6bd4\u8f03\u3057\u305fatomic\u306e\u5229\u70b9<\/h3>\n\n\n\n<p>\u5f93\u6765\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u3084\u30bb\u30de\u30d5\u30a9\u3068\u6bd4\u8f03\u3057\u3066\u3001atomic\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-50a29161-9e17-4185-9c6c-29bf789d111d\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>atomic<\/th><th>\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9<\/th><\/tr><\/thead><tbody><tr><td>\u7c92\u5ea6<\/td><td>\u5909\u6570\u5358\u4f4d<\/td><td>\u30af\u30ea\u30c6\u30a3\u30ab\u30eb\u30bb\u30af\u30b7\u30e7\u30f3\u5358\u4f4d<\/td><\/tr><tr><td>\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/td><td>\u5c0f\u3055\u3044<\/td><td>\u6bd4\u8f03\u7684\u5927\u304d\u3044<\/td><\/tr><tr><td>\u30c7\u30c3\u30c9\u30ed\u30c3\u30af<\/td><td>\u767a\u751f\u3057\u306a\u3044<\/td><td>\u767a\u751f\u306e\u53ef\u80fd\u6027\u3042\u308a<\/td><\/tr><tr><td>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3<\/td><td>\u9ad8\u3044<\/td><td>\u4f4e\u3044<\/td><\/tr><tr><td>\u4f7f\u7528\u306e\u8907\u96d1\u3055<\/td><td>\u6bd4\u8f03\u7684\u30b7\u30f3\u30d7\u30eb<\/td><td>\u3088\u308a\u8907\u96d1<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u306fatomic\u304c\u7279\u306b\u6709\u52b9\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\n#include &lt;mutex&gt;\nclass Counter {\n    int value = 0;\n    std::mutex mtx;\npublic:\n    void increment() {\n        std::lock_guard&lt;std::mutex&gt; lock(mtx);\n        value++;\n    }\n    int get() {\n        std::lock_guard&lt;std::mutex&gt; lock(mtx);\n        return value;\n    }\n};\n\n\/\/ atomic\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\n#include &lt;atomic&gt;\nclass AtomicCounter {\n    std::atomic&lt;int&gt; value{0};\npublic:\n    void increment() {\n        value++;  \/\/ \u30ed\u30c3\u30af\u4e0d\u8981\u3067\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\n    }\n    int get() {\n        return value.load();  \/\/ \u30ed\u30c3\u30af\u4e0d\u8981\u3067\u5b89\u5168\u306b\u8aad\u307f\u53d6\u308a\n    }\n};<\/pre>\n\n\n\n<p>atomic\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5229\u70b9\u304c\u5f97\u3089\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ed\u30c3\u30af\/\u30a2\u30f3\u30ed\u30c3\u30af\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u767a\u751f\u3057\u306a\u3044<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u306e\u7af6\u5408\u304c\u6e1b\u5c11<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u30ea\u30b9\u30af\u6392\u9664<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ed\u30c3\u30af\u306e\u53d6\u5f97\u9806\u5e8f\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044<\/li>\n\n\n\n<li>\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u306e\u53ef\u80fd\u6027\u304c\u306a\u3044\u8a2d\u8a08\u304c\u53ef\u80fd<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u3088\u308a\u7c21\u6f54\u306a\u30b3\u30fc\u30c9<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u540c\u671f\u306e\u305f\u3081\u306e\u30dc\u30a4\u30e9\u30fc\u30d7\u30ec\u30fc\u30c8\u30b3\u30fc\u30c9\u304c\u4e0d\u8981<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u304c\u5411\u4e0a<\/li>\n<\/ul>\n\n\n\n<p>\u305f\u3060\u3057\u3001atomic\u306f\u4e07\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8907\u96d1\u306a\u64cd\u4f5c\u3084\u8907\u6570\u306e\u5909\u6570\u3092\u540c\u6642\u306b\u66f4\u65b0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u5f93\u6765\u306e\u30ed\u30c3\u30af\u6a5f\u69cb\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u9069\u6750\u9069\u6240\u3067\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">std::atomic\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">atomic\u5909\u6570\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>std::atomic\u306f\u69d8\u3005\u306a\u30c7\u30fc\u30bf\u578b\u3067\u4f7f\u7528\u53ef\u80fd\u3067\u3059\u3002\u57fa\u672c\u7684\u306a\u5ba3\u8a00\u3068\u521d\u671f\u5316\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;atomic&gt;\n\n\/\/ \u57fa\u672c\u7684\u306a\u6574\u6570\u578b\u3067\u306e\u4f7f\u7528\nstd::atomic&lt;int&gt; atomic_int{0};                 \/\/ \u6574\u6570\u578b\nstd::atomic&lt;long&gt; atomic_long{0L};              \/\/ long\u578b\nstd::atomic&lt;unsigned&gt; atomic_unsigned{0u};       \/\/ \u7b26\u53f7\u306a\u3057\u6574\u6570\n\n\/\/ \u30dd\u30a4\u30f3\u30bf\u578b\u3067\u306e\u4f7f\u7528\nint* ptr = nullptr;\nstd::atomic&lt;int*&gt; atomic_ptr{ptr};              \/\/ \u30dd\u30a4\u30f3\u30bf\u578b\n\n\/\/ boolean\u3067\u306e\u4f7f\u7528\nstd::atomic&lt;bool&gt; atomic_bool{false};           \/\/ \u771f\u507d\u5024\n\n\/\/ \u30e6\u30fc\u30b6\u30fc\u5b9a\u7fa9\u578b\u3067\u306e\u4f7f\u7528\uff08\u30c8\u30ea\u30d3\u30a2\u30eb\u306b\u30b3\u30d4\u30fc\u53ef\u80fd\u306a\u578b\u306e\u307f\uff09\nstruct Trivial { int x; int y; };\nstd::atomic&lt;Trivial&gt; atomic_trivial{{0, 0}};    \/\/ \u30c8\u30ea\u30d3\u30a2\u30eb\u306a\u69cb\u9020\u4f53<\/pre>\n\n\n\n<p>\u521d\u671f\u5316\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5024\u521d\u671f\u5316\u306e\u4fdd\u8a3c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u660e\u793a\u7684\u306a\u521d\u671f\u5024\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3092\u63a8\u5968<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u521d\u671f\u5316\u3067\u306f\u672a\u5b9a\u7fa9\u306e\u5024\u3068\u306a\u308b\u53ef\u80fd\u6027<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8907\u5408\u578b\u3067\u306e\u5236\u7d04<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c8\u30ea\u30d3\u30a2\u30eb\u306b\u30b3\u30d4\u30fc\u53ef\u80fd\u306a\u578b\u306e\u307f\u4f7f\u7528\u53ef\u80fd<\/li>\n\n\n\n<li>\u4eee\u60f3\u95a2\u6570\u3092\u6301\u3064\u30af\u30e9\u30b9\u306f\u4f7f\u7528\u4e0d\u53ef<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30a2\u30c8\u30df\u30c3\u30af\u64cd\u4f5c\u3067\u5229\u7528\u53ef\u80fd\u306a\u95a2\u6570\u4e00\u89a7<\/h3>\n\n\n\n<p>std::atomic\u3067\u5229\u7528\u53ef\u80fd\u306a\u4e3b\u8981\u306a\u64cd\u4f5c\u3092\u30ab\u30c6\u30b4\u30ea\u5225\u306b\u89e3\u8aac\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8aad\u307f\u66f8\u304d\u64cd\u4f5c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::atomic&lt;int&gt; value{0};\n\n\/\/ \u8aad\u307f\u53d6\u308a\u64cd\u4f5c\nint current = value.load();                    \/\/ \u73fe\u5728\u5024\u306e\u8aad\u307f\u53d6\u308a\nint relaxed = value.load(std::memory_order_relaxed);  \/\/ \u7de9\u548c\u3055\u308c\u305f\u9806\u5e8f\u3067\u306e\u8aad\u307f\u53d6\u308a\n\n\/\/ \u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\nvalue.store(10);                               \/\/ \u5024\u306e\u66f8\u304d\u8fbc\u307f\nvalue.store(20, std::memory_order_release);    \/\/ \u7279\u5b9a\u306e\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u3067\u306e\u66f8\u304d\u8fbc\u307f<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u66f4\u65b0\u64cd\u4f5c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\/\u30c7\u30af\u30ea\u30e1\u30f3\u30c8\nint prev = value++;                            \/\/ \u5f8c\u7f6e\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\nint next = ++value;                            \/\/ \u524d\u7f6e\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8\nvalue--;                                       \/\/ \u5f8c\u7f6e\u30c7\u30af\u30ea\u30e1\u30f3\u30c8\n--value;                                       \/\/ \u524d\u7f6e\u30c7\u30af\u30ea\u30e1\u30f3\u30c8\n\n\/\/ \u52a0\u7b97\/\u6e1b\u7b97\nvalue += 5;                                    \/\/ \u52a0\u7b97\nvalue -= 3;                                    \/\/ \u6e1b\u7b97<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u4ea4\u63db\u64cd\u4f5c<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5358\u7d14\u306a\u4ea4\u63db\nint old = value.exchange(100);                 \/\/ \u5024\u306e\u4ea4\u63db\n\n\/\/ \u6761\u4ef6\u4ed8\u304d\u4ea4\u63db\nint expected = 100;\nbool success = value.compare_exchange_strong(   \/\/ \u5f37\u3044\u6bd4\u8f03\u4ea4\u63db\n    expected,    \/\/ \u671f\u5f85\u5024\uff08\u5931\u6557\u6642\u306b\u66f4\u65b0\u3055\u308c\u308b\uff09\n    200         \/\/ \u65b0\u3057\u3044\u5024\n);\n\n\/\/ \u5f31\u3044\u6bd4\u8f03\u4ea4\u63db\uff08\u30b9\u30d7\u30ea\u30a2\u30b9\u30d5\u30a7\u30a4\u30eb\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u3042\u308a\uff09\nsuccess = value.compare_exchange_weak(\n    expected,\n    200\n);<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u6307\u5b9a\u65b9\u6cd5\u3068\u5f71\u97ff<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306f\u3001\u30de\u30eb\u30c1\u30b9\u30ec\u30c3\u30c9\u74b0\u5883\u3067\u306e\u64cd\u4f5c\u306e\u9806\u5e8f\u4ed8\u3051\u3092\u5236\u5fa1\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">std::atomic&lt;int&gt; value{0};\n\n\/\/ \u5404\u7a2e\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u4f7f\u7528\u4f8b\nvalue.store(1, std::memory_order_relaxed);     \/\/ \u6700\u3082\u7de9\u548c\u3055\u308c\u305f\u9806\u5e8f\nvalue.store(2, std::memory_order_release);     \/\/ \u30ea\u30ea\u30fc\u30b9\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\nint current = value.load(std::memory_order_acquire);  \/\/ \u30a2\u30af\u30ef\u30a4\u30a2\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\nvalue.store(3, std::memory_order_seq_cst);     \/\/ \u5b8c\u5168\u306a\u30b7\u30fc\u30b1\u30f3\u30b7\u30e3\u30eb\u306a\u4e00\u8cab\u6027<\/pre>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u9078\u629e\u6307\u91dd\uff1a<\/p>\n\n\n<div id=\"id-f7bf75fe-4dc8-4d12-848a-9f65187bb64a\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc<\/th><th>\u7528\u9014<\/th><th>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5f71\u97ff<\/th><\/tr><\/thead><tbody><tr><td>relaxed<\/td><td>\u9806\u5e8f\u4ed8\u3051\u304c\u4e0d\u8981\u306a\u5358\u7d14\u306a\u64cd\u4f5c<\/td><td>\u6700\u5c0f<\/td><\/tr><tr><td>release\/acquire<\/td><td>\u751f\u7523\u8005\/\u6d88\u8cbb\u8005\u30d1\u30bf\u30fc\u30f3<\/td><td>\u4e2d\u7a0b\u5ea6<\/td><\/tr><tr><td>seq_cst<\/td><td>\u53b3\u5bc6\u306a\u9806\u5e8f\u4ed8\u3051\u304c\u5fc5\u8981\u306a\u5834\u5408<\/td><td>\u6700\u5927<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4f7f\u7528\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u751f\u7523\u8005\/\u6d88\u8cbb\u8005\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5\u4f8b\nstd::atomic&lt;int&gt; data{0};\nstd::atomic&lt;bool&gt; ready{false};\n\n\/\/ \u751f\u7523\u8005\u30b9\u30ec\u30c3\u30c9\nvoid producer() {\n    data.store(42, std::memory_order_relaxed);  \/\/ \u30c7\u30fc\u30bf\u306e\u6e96\u5099\n    ready.store(true, std::memory_order_release);  \/\/ \u6e96\u5099\u5b8c\u4e86\u3092\u901a\u77e5\n}\n\n\/\/ \u6d88\u8cbb\u8005\u30b9\u30ec\u30c3\u30c9\nvoid consumer() {\n    while (!ready.load(std::memory_order_acquire)) {\n        \/\/ \u6e96\u5099\u5b8c\u4e86\u3092\u5f85\u6a5f\n    }\n    \/\/ \u3053\u306e\u6642\u70b9\u3067data.load\u306f42\u3092\u8fd4\u3059\u3053\u3068\u304c\u4fdd\u8a3c\u3055\u308c\u308b\n    assert(data.load(std::memory_order_relaxed) == 42);\n}<\/pre>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u3092\u9069\u5207\u306b\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u5fc5\u8981\u306a\u540c\u671f\u3092\u78ba\u4fdd\u3057\u3064\u3064\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u8907\u96d1\u306a\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u4f7f\u7528\u306f\u614e\u91cd\u306b\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u3001\u5fc5\u8981\u4ee5\u4e0a\u306b\u7de9\u548c\u3055\u308c\u305f\u9806\u5e8f\u3092\u4f7f\u7528\u3059\u308b\u3068\u4e88\u671f\u305b\u306c\u30d0\u30b0\u306e\u539f\u56e0\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u7684\u306aatomic\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30ab\u30a6\u30f3\u30bf\u30fc\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p>\u6700\u3082\u57fa\u672c\u7684\u304b\u3064\u5b9f\u7528\u7684\u306aatomic\u306e\u6d3b\u7528\u4f8b\u3068\u3057\u3066\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u30ab\u30a6\u30f3\u30bf\u30fc\u306e\u5b9f\u88c5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;atomic&gt;\n#include &lt;thread&gt;\n#include &lt;vector&gt;\n\nclass ThreadSafeCounter {\nprivate:\n    std::atomic&lt;uint64_t&gt; count_{0};\n    std::atomic&lt;bool&gt; enabled_{true};\n\npublic:\n    \/\/ \u8907\u6570\u306e\u52a0\u7b97\u65b9\u6cd5\u3092\u63d0\u4f9b\n    void increment() {\n        count_++;\n    }\n\n    void add(uint64_t value) {\n        count_.fetch_add(value, std::memory_order_relaxed);\n    }\n\n    \/\/ \u6761\u4ef6\u4ed8\u304d\u52a0\u7b97\u306e\u4f8b\n    bool conditional_increment() {\n        if (!enabled_.load(std::memory_order_acquire)) {\n            return false;\n        }\n        count_++;\n        return true;\n    }\n\n    \/\/ \u30ab\u30a6\u30f3\u30bf\u30fc\u306e\u7121\u52b9\u5316\n    void disable() {\n        enabled_.store(false, std::memory_order_release);\n    }\n\n    \/\/ \u73fe\u5728\u5024\u306e\u53d6\u5f97\n    uint64_t get() const {\n        return count_.load(std::memory_order_acquire);\n    }\n};\n\n\/\/ \u4f7f\u7528\u4f8b\nvoid stress_test() {\n    ThreadSafeCounter counter;\n    std::vector&lt;std::thread&gt; threads;\n\n    \/\/ \u8907\u6570\u30b9\u30ec\u30c3\u30c9\u3067\u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u64cd\u4f5c\n    for (int i = 0; i &lt; 10; ++i) {\n        threads.emplace_back([&amp;counter]() {\n            for (int j = 0; j &lt; 1000; ++j) {\n                counter.increment();\n            }\n        });\n    }\n\n    \/\/ \u5168\u30b9\u30ec\u30c3\u30c9\u306e\u7d42\u4e86\u3092\u5f85\u6a5f\n    for (auto&amp; t : threads) {\n        t.join();\n    }\n\n    \/\/ \u7d50\u679c\u306e\u78ba\u8a8d\uff08\u5fc5\u305a10000\u306b\u306a\u308b\uff09\n    assert(counter.get() == 10000);\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u5b9f\u88c5\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u306e\u540c\u6642\u30a2\u30af\u30bb\u30b9\u306b\u5bfe\u3057\u3066\u5b89\u5168<\/li>\n\n\n\n<li>\u6761\u4ef6\u4ed8\u304d\u64cd\u4f5c\u306e\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li>\u7de9\u548c\u3055\u308c\u305f\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u6d3b\u7528\u306b\u3088\u308b\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30ed\u30c3\u30af\u30d5\u30ea\u30fc\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u4f5c\u6210\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u8907\u6570\u306eatomic\u5909\u6570\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u3088\u308a\u8907\u96d1\u306a\u30ed\u30c3\u30af\u30d5\u30ea\u30fc\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306f\u30b7\u30f3\u30d7\u30eb\u306a\u30ed\u30c3\u30af\u30d5\u30ea\u30fc\u30b9\u30bf\u30c3\u30af\u306e\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">template&lt;typename T&gt;\nclass LockFreeStack {\nprivate:\n    struct Node {\n        T data;\n        std::atomic&lt;Node*&gt; next;\n\n        Node(const T&amp; value) : data(value), next(nullptr) {}\n    };\n\n    std::atomic&lt;Node*&gt; head_{nullptr};\n    std::atomic&lt;size_t&gt; size_{0};\n\npublic:\n    void push(T value) {\n        Node* new_node = new Node(value);\n\n        \/\/ \u30d8\u30c3\u30c9\u306e\u66f4\u65b0\u304c\u6210\u529f\u3059\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\n        do {\n            new_node-&gt;next = head_.load(std::memory_order_relaxed);\n        } while (!head_.compare_exchange_weak(\n            new_node-&gt;next.load(),\n            new_node,\n            std::memory_order_release,\n            std::memory_order_relaxed\n        ));\n\n        size_.fetch_add(1, std::memory_order_relaxed);\n    }\n\n    bool pop(T&amp; result) {\n        Node* current_head;\n\n        do {\n            current_head = head_.load(std::memory_order_relaxed);\n            if (!current_head) {\n                return false;  \/\/ \u30b9\u30bf\u30c3\u30af\u304c\u7a7a\n            }\n        } while (!head_.compare_exchange_weak(\n            current_head,\n            current_head-&gt;next,\n            std::memory_order_acquire,\n            std::memory_order_relaxed\n        ));\n\n        result = current_head-&gt;data;\n        size_.fetch_sub(1, std::memory_order_relaxed);\n        delete current_head;\n        return true;\n    }\n\n    size_t size() const {\n        return size_.load(std::memory_order_relaxed);\n    }\n\n    bool empty() const {\n        return head_.load(std::memory_order_relaxed) == nullptr;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>atomic\u64cd\u4f5c\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d5\u30a9\u30eb\u30b9\u30b7\u30a7\u30a2\u30ea\u30f3\u30b0\u306e\u56de\u907f<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">struct alignas(64) CacheLinePadded {\n    std::atomic&lt;int64_t&gt; value;\n    \/\/ \u30d1\u30c7\u30a3\u30f3\u30b0\u306b\u3088\u308a\u5225\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u306b\u914d\u7f6e\u3055\u308c\u308b\n    char padding[64 - sizeof(std::atomic&lt;int64_t&gt;)];\n};\n\n\/\/ \u8907\u6570\u306e\u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u52b9\u7387\u7684\u306b\u914d\u7f6e\nclass MultiCounter {\n    std::array&lt;CacheLinePadded, 4&gt; counters_;\npublic:\n    void increment(size_t index) {\n        counters_[index].value.fetch_add(1, std::memory_order_relaxed);\n    }\n};<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6d3b\u7528<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BatchCounter {\n    std::atomic&lt;uint64_t&gt; global_count_{0};\n    static constexpr size_t BATCH_SIZE = 100;\n\n    \/\/ \u30b9\u30ec\u30c3\u30c9\u30ed\u30fc\u30ab\u30eb\u306a\u30d0\u30c3\u30d5\u30a1\n    thread_local static uint64_t local_count_;\n\npublic:\n    void increment() {\n        if (++local_count_ &gt;= BATCH_SIZE) {\n            \/\/ \u30d0\u30c3\u30c1\u30b5\u30a4\u30ba\u306b\u9054\u3057\u305f\u3089\u30b0\u30ed\u30fc\u30d0\u30eb\u30ab\u30a6\u30f3\u30bf\u30fc\u306b\u53cd\u6620\n            global_count_.fetch_add(local_count_, std::memory_order_relaxed);\n            local_count_ = 0;\n        }\n    }\n\n    uint64_t get() {\n        return global_count_.load(std::memory_order_acquire) + local_count_;\n    }\n\n    ~BatchCounter() {\n        \/\/ \u6b8b\u308a\u306e\u30ab\u30a6\u30f3\u30c8\u3092\u53cd\u6620\n        if (local_count_ &gt; 0) {\n            global_count_.fetch_add(local_count_, std::memory_order_release);\n        }\n    }\n};<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u6700\u9069\u5316<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class OptimizedQueue {\n    std::atomic&lt;Node*&gt; head_{nullptr};\n    std::atomic&lt;Node*&gt; tail_{nullptr};\n\n    void enqueue(T value) {\n        Node* new_node = new Node(value);\n\n        \/\/ \u30c6\u30fc\u30eb\u30dd\u30a4\u30f3\u30bf\u306e\u66f4\u65b0\uff08relaxed\u3067\u5341\u5206\uff09\n        Node* prev_tail = tail_.exchange(new_node, std::memory_order_relaxed);\n\n        if (prev_tail) {\n            \/\/ \u30ea\u30f3\u30af\u306e\u66f4\u65b0\uff08release\u304c\u5fc5\u8981\uff09\n            prev_tail-&gt;next.store(new_node, std::memory_order_release);\n        } else {\n            \/\/ \u6700\u521d\u306e\u30ce\u30fc\u30c9\uff08release\u304c\u5fc5\u8981\uff09\n            head_.store(new_node, std::memory_order_release);\n        }\n    }\n};<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n<div id=\"id-815884e9-9da0-4153-9365-70264315bcf9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c6\u30af\u30cb\u30c3\u30af<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u30c7\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u30ad\u30e3\u30c3\u30b7\u30e5\u30e9\u30a4\u30f3\u8abf\u6574<\/td><td>\u30ad\u30e3\u30c3\u30b7\u30e5\u7af6\u5408\u306e\u524a\u6e1b<\/td><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5897\u52a0<\/td><\/tr><tr><td>\u30d0\u30c3\u30c1\u51e6\u7406<\/td><td>\u539f\u5b50\u64cd\u4f5c\u306e\u524a\u6e1b<\/td><td>\u4e00\u6642\u7684\u306a\u4e0d\u6574\u5408\u306e\u8a31\u5bb9<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u7de9\u548c<\/td><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a<\/td><td>\u6b63\u78ba\u306a\u9806\u5e8f\u4ed8\u3051\u306e\u8907\u96d1\u5316<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u6700\u9069\u5316\u3092\u9069\u7528\u3059\u308b\u969b\u306f\u3001\u5fc5\u305a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u3092\u884c\u3044\u3001\u5b9f\u969b\u306e\u52b9\u679c\u3092\u6e2c\u5b9a\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u8907\u96d1\u306a\u6700\u9069\u5316\u306f\u4fdd\u5b88\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u5fc5\u8981\u306a\u5834\u5408\u306b\u306e\u307f\u9069\u7528\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">atomic\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u9078\u629e\u30df\u30b9\u306b\u3088\u308b\u6027\u80fd\u4f4e\u4e0b<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u306e\u8aa4\u3063\u305f\u9078\u629e\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6027\u80fd\u3092\u5927\u304d\u304f\u4f4e\u4e0b\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5178\u578b\u7684\u306a\u554f\u984c\u30d1\u30bf\u30fc\u30f3\u3068\u5bfe\u7b56\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\u4f8b\nclass PoorPerformanceQueue {\n    std::atomic&lt;int&gt; data_[1024];\n    std::atomic&lt;size_t&gt; head_{0};\n    std::atomic&lt;size_t&gt; tail_{0};\n\npublic:\n    void enqueue(int value) {\n        \/\/ \u904e\u5270\u306b\u5f37\u3044\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u3092\u4f7f\u7528\n        size_t current_tail = tail_.load(std::memory_order_seq_cst);\n        data_[current_tail].store(value, std::memory_order_seq_cst);\n        tail_.store((current_tail + 1) % 1024, std::memory_order_seq_cst);\n    }\n};\n\n\/\/ \u6700\u9069\u5316\u3055\u308c\u305f\u5b9f\u88c5\nclass OptimizedQueue {\n    std::atomic&lt;int&gt; data_[1024];\n    std::atomic&lt;size_t&gt; head_{0};\n    std::atomic&lt;size_t&gt; tail_{0};\n\npublic:\n    void enqueue(int value) {\n        \/\/ \u5fc5\u8981\u6700\u5c0f\u9650\u306e\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc\u3092\u4f7f\u7528\n        size_t current_tail = tail_.load(std::memory_order_relaxed);\n        data_[current_tail].store(value, std::memory_order_relaxed);\n        tail_.store((current_tail + 1) % 1024, std::memory_order_release);\n    }\n};<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5f71\u97ff\u306e\u6bd4\u8f03\uff1a<\/p>\n\n\n<div id=\"id-e1d4128f-ae68-4706-b902-58cc4ae0a04c\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30e1\u30e2\u30ea\u30aa\u30fc\u30c0\u30fc<\/th><th>\u76f8\u5bfe\u7684\u306a\u30b3\u30b9\u30c8<\/th><th>\u4f7f\u7528\u3059\u3079\u304d\u72b6\u6cc1<\/th><\/tr><\/thead><tbody><tr><td>seq_cst<\/td><td>\u9ad8<\/td><td>\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u9806\u5e8f\u4ed8\u3051\u304c\u5fc5\u9808\u306e\u5834\u5408\u306e\u307f<\/td><\/tr><tr><td>acq_rel<\/td><td>\u4e2d<\/td><td>\u30b9\u30ec\u30c3\u30c9\u9593\u306e\u540c\u671f\u304c\u5fc5\u8981\u306a\u5834\u5408<\/td><\/tr><tr><td>relaxed<\/td><td>\u4f4e<\/td><td>\u72ec\u7acb\u3057\u305f\u64cd\u4f5c\u3084\u9806\u5e8f\u304c\u91cd\u8981\u3067\u306a\u3044\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u904e\u5270\u306a\u4f7f\u7528\u304c\u3082\u305f\u3089\u3059\u8907\u96d1\u6027\u306e\u5897\u52a0<\/h3>\n\n\n\n<p>atomic\u306e\u904e\u5270\u306a\u4f7f\u7528\u306f\u3001\u30b3\u30fc\u30c9\u306e\u8907\u96d1\u6027\u3092\u4e0d\u5fc5\u8981\u306b\u5897\u52a0\u3055\u305b\u3001\u30d0\u30b0\u306e\u6e29\u5e8a\u3068\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u904e\u5270\u306batomic\u3092\u4f7f\u7528\u3057\u305f\u4f8b\nclass OvercomplicatedCounter {\n    std::atomic&lt;int&gt; count_{0};\n    std::atomic&lt;bool&gt; enabled_{true};\n    std::atomic&lt;int&gt; max_value_{100};\n    std::atomic&lt;int&gt; min_value_{0};\n    std::atomic&lt;int&gt; step_size_{1};\n\npublic:\n    bool increment() {\n        if (!enabled_.load(std::memory_order_acquire)) {\n            return false;\n        }\n\n        int current = count_.load(std::memory_order_relaxed);\n        int max = max_value_.load(std::memory_order_relaxed);\n        int step = step_size_.load(std::memory_order_relaxed);\n\n        if (current + step &lt;= max) {\n            return count_.compare_exchange_strong(current, current + step);\n        }\n        return false;\n    }\n};\n\n\/\/ \u9069\u5207\u306b\u8a2d\u8a08\u3055\u308c\u305f\u7248\nclass WellDesignedCounter {\n    std::atomic&lt;int&gt; count_{0};\n    const int max_value_;  \/\/ \u901a\u5e38\u306e\u5b9a\u6570\u3067\u5341\u5206\n    const int min_value_;\n    const int step_size_;\n    std::atomic&lt;bool&gt; enabled_{true};\n\npublic:\n    WellDesignedCounter(int max = 100, int min = 0, int step = 1)\n        : max_value_(max), min_value_(min), step_size_(step) {}\n\n    bool increment() {\n        if (!enabled_.load(std::memory_order_acquire)) {\n            return false;\n        }\n\n        int current = count_.load(std::memory_order_relaxed);\n        if (current + step_size_ &lt;= max_value_) {\n            return count_.compare_exchange_strong(current, current + step_size_);\n        }\n        return false;\n    }\n};<\/pre>\n\n\n\n<p>\u8907\u96d1\u6027\u3092\u6291\u3048\u308b\u305f\u3081\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5909\u66f4\u983b\u5ea6\u306b\u3088\u308b\u5224\u65ad<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u983b\u7e41\u306b\u5909\u66f4\u3055\u308c\u308b\u5024\u306e\u307fatomic\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u8a2d\u5b9a\u5024\u3084\u5b9a\u6570\u306f\u901a\u5e38\u306e\u5909\u6570\u3067\u5341\u5206<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b9\u30b3\u30fc\u30d7\u306e\u6700\u5c0f\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>atomic\u5909\u6570\u306e\u5f71\u97ff\u7bc4\u56f2\u3092\u5c40\u6240\u5316<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u540c\u671f\u3092\u907f\u3051\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u5358\u7d14\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u4f9d\u5b58\u95a2\u4fc2\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u53ef\u80fd\u306a\u9650\u308a\u72ec\u7acb\u3057\u305f\u64cd\u4f5c\u3092\u7dad\u6301<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30c7\u30d0\u30c3\u30b0\u6642\u306e\u6ce8\u610f\u4e8b\u9805\u3068\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>atomic\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u30c7\u30d0\u30c3\u30b0\u306f\u7279\u306b\u56f0\u96e3\u3067\u3059\u3002\u52b9\u679c\u7684\u306a\u30c7\u30d0\u30c3\u30b0\u624b\u6cd5\u3068\u30c4\u30fc\u30eb\u306e\u6d3b\u7528\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30c7\u30d0\u30c3\u30b0\u652f\u63f4\u6a5f\u80fd\u3092\u7d44\u307f\u8fbc\u3093\u3060\u5b9f\u88c5\u4f8b\nclass DebuggableAtomicContainer {\nprivate:\n    std::atomic&lt;int&gt; value_{0};\n    #ifdef DEBUG\n    std::atomic&lt;uint64_t&gt; modification_count_{0};\n    std::atomic&lt;uint64_t&gt; failed_modifications_{0};\n    #endif\n\npublic:\n    bool try_update(int new_value) {\n        int expected = value_.load(std::memory_order_relaxed);\n        bool success = value_.compare_exchange_strong(\n            expected, \n            new_value,\n            std::memory_order_acq_rel\n        );\n\n        #ifdef DEBUG\n        modification_count_.fetch_add(1, std::memory_order_relaxed);\n        if (!success) {\n            failed_modifications_.fetch_add(1, std::memory_order_relaxed);\n        }\n        #endif\n\n        return success;\n    }\n\n    #ifdef DEBUG\n    struct DebugStats {\n        uint64_t total_modifications;\n        uint64_t failed_modifications;\n        double failure_rate;\n    };\n\n    DebugStats get_stats() const {\n        uint64_t total = modification_count_.load(std::memory_order_relaxed);\n        uint64_t failed = failed_modifications_.load(std::memory_order_relaxed);\n        return {\n            total,\n            failed,\n            total &gt; 0 ? (double)failed \/ total : 0.0\n        };\n    }\n    #endif\n};<\/pre>\n\n\n\n<p>\u30c7\u30d0\u30c3\u30b0\u306b\u6d3b\u7528\u3067\u304d\u308b\u30c4\u30fc\u30eb\u3068\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9759\u7684\u89e3\u6790\u30c4\u30fc\u30eb<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clang Static Analyzer<\/li>\n\n\n\n<li>cppcheck<\/li>\n\n\n\n<li>Microsoft Visual Studio Code Analyzer<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u52d5\u7684\u89e3\u6790\u30c4\u30fc\u30eb<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valgrind\uff08\u7279\u306bDRD, Helgrind\uff09<\/li>\n\n\n\n<li>Intel Inspector<\/li>\n\n\n\n<li>Thread Sanitizer<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30ed\u30ae\u30f3\u30b0\u3068\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0<\/strong>\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30ab\u30b9\u30bf\u30e0\u30ed\u30ae\u30f3\u30b0\u6a5f\u69cb\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30ab\u30a6\u30f3\u30bf\u30fc\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30af\u30e9\u30c3\u30b7\u30e5\u30c0\u30f3\u30d7\u306e\u89e3\u6790<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ed\u30ae\u30f3\u30b0\u6a5f\u80fd\u4ed8\u304datomic\u5b9f\u88c5\u4f8b\ntemplate&lt;typename T&gt;\nclass LoggedAtomic {\n    std::atomic&lt;T&gt; value_;\n    static std::atomic&lt;size_t&gt; global_ops_count_;\n\n    void log_operation(const char* op_type, T old_value, T new_value) {\n        std::cout &lt;&lt; \"[\" &lt;&lt; std::this_thread::get_id() &lt;&lt; \"] \"\n                  &lt;&lt; op_type &lt;&lt; \": \" &lt;&lt; old_value &lt;&lt; \" -&gt; \" &lt;&lt; new_value\n                  &lt;&lt; \" (total ops: \" &lt;&lt; global_ops_count_.fetch_add(1) &lt;&lt; \")\\n\";\n    }\n\npublic:\n    T fetch_add(T arg) {\n        T old_value = value_.fetch_add(arg);\n        log_operation(\"fetch_add\", old_value, old_value + arg);\n        return old_value;\n    }\n\n    \/\/ \u4ed6\u306e\u64cd\u4f5c\u3082\u540c\u69d8\u306b\u30ed\u30b0\u3092\u53d6\u308b\n};<\/pre>\n\n\n\n<p>\u30c7\u30d0\u30c3\u30b0\u6642\u306e\u4e00\u822c\u7684\u306a\u6ce8\u610f\u4e8b\u9805\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u518d\u73fe\u6027\u306e\u78ba\u4fdd<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u30d3\u30eb\u30c9\u3067\u3082\u6700\u9069\u5316\u3092\u6709\u52b9\u306b\u3059\u308b\u5834\u5408\u304c\u3042\u308b<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u306e\u5b9f\u884c\u9806\u5e8f\u3092\u56fa\u5b9a\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30b0\u306e\u5c40\u6240\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u554f\u984c\u306e\u5207\u308a\u5206\u3051\u3092\u614e\u91cd\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u5358\u4f53\u30c6\u30b9\u30c8\u306e\u4f5c\u6210\u3068\u6d3b\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5206\u6790<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306e\u7279\u5b9a<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u540c\u671f\u306e\u691c\u51fa<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306a\u30b2\u30fc\u30e0\u30a8\u30f3\u30b8\u30f3\u3067\u306e\u5229\u7528\u4f8b<\/h3>\n\n\n\n<p>\u30b2\u30fc\u30e0\u30a8\u30f3\u30b8\u30f3\u3067\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3057\u3064\u3064\u3001\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u5b9f\u88c5\u304c\u6c42\u3081\u3089\u308c\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u30b2\u30fc\u30e0\u30a8\u30f3\u30b8\u30f3\u3067\u306eatomic\u6d3b\u7528\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30b2\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u72b6\u614b\u7ba1\u7406\nclass GameObject {\nprivate:\n    \/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u5b58\u72b6\u614b\n    std::atomic&lt;bool&gt; is_alive_{true};\n    \/\/ \u73fe\u5728\u306e\u30d8\u30eb\u30b9\u30dd\u30a4\u30f3\u30c8\n    std::atomic&lt;int&gt; health_{100};\n    \/\/ \u975e\u30a2\u30c8\u30df\u30c3\u30af\u306a\u30c7\u30fc\u30bf\n    Vector3 position_;\n    std::mutex position_mutex_;\n\npublic:\n    \/\/ \u30c0\u30e1\u30fc\u30b8\u51e6\u7406\uff08\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304b\u3089\u547c\u3073\u51fa\u3057\u53ef\u80fd\uff09\n    bool applyDamage(int damage) {\n        int current_health = health_.load(std::memory_order_relaxed);\n        while (current_health &gt; 0) {\n            int new_health = std::max(0, current_health - damage);\n            if (health_.compare_exchange_weak(\n                current_health,\n                new_health,\n                std::memory_order_release,\n                std::memory_order_relaxed\n            )) {\n                if (new_health == 0) {\n                    is_alive_.store(false, std::memory_order_release);\n                }\n                return true;\n            }\n        }\n        return false;\n    }\n\n    \/\/ \u7269\u7406\u6f14\u7b97\u3068\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u540c\u671f\n    void updatePosition(const Vector3&amp; new_pos) {\n        std::lock_guard&lt;std::mutex&gt; lock(position_mutex_);\n        position_ = new_pos;\n    }\n\n    bool isAlive() const {\n        return is_alive_.load(std::memory_order_acquire);\n    }\n};\n\n\/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30d7\u30fc\u30eb\u7ba1\u7406\nclass GameObjectPool {\nprivate:\n    static constexpr size_t POOL_SIZE = 1024;\n    std::array&lt;GameObject, POOL_SIZE&gt; objects_;\n    std::atomic&lt;uint32_t&gt; active_count_{0};\n    std::atomic&lt;uint32_t&gt; allocation_bitmap_[POOL_SIZE \/ 32]{};\n\n    \/\/ \u30d3\u30c3\u30c8\u30de\u30c3\u30d7\u64cd\u4f5c\u306e\u30d8\u30eb\u30d1\u30fc\u95a2\u6570\n    bool trySetBit(size_t index) {\n        uint32_t bit = 1u &lt;&lt; (index % 32);\n        uint32_t&amp; word = allocation_bitmap_[index \/ 32].operator uint32_t&amp;();\n        uint32_t old_word = word;\n        do {\n            if (old_word &amp; bit) return false;\n        } while (!allocation_bitmap_[index \/ 32].compare_exchange_weak(\n            old_word, old_word | bit,\n            std::memory_order_acquire,\n            std::memory_order_relaxed\n        ));\n        return true;\n    }\n\npublic:\n    GameObject* allocate() {\n        if (active_count_.load(std::memory_order_relaxed) &gt;= POOL_SIZE) {\n            return nullptr;\n        }\n\n        for (size_t i = 0; i &lt; POOL_SIZE; ++i) {\n            if (trySetBit(i)) {\n                active_count_.fetch_add(1, std::memory_order_relaxed);\n                return &amp;objects_[i];\n            }\n        }\n        return nullptr;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u5927\u898f\u6a21\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u8907\u6570\u306e\u30ce\u30fc\u30c9\u9593\u3067\u306e\u72b6\u614b\u540c\u671f\u304c\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306eatomic\u6d3b\u7528\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u5206\u6563\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u30ea\u30fc\u30c0\u30fc\u9078\u51fa\u6a5f\u69cb\nclass LeaderElection {\nprivate:\n    std::atomic&lt;uint64_t&gt; term_{0};\n    std::atomic&lt;NodeId&gt; current_leader_{NO_LEADER};\n    std::atomic&lt;State&gt; state_{State::FOLLOWER};\n\n    \/\/ \u30cf\u30fc\u30c8\u30d3\u30fc\u30c8\u7ba1\u7406\n    std::atomic&lt;uint64_t&gt; last_heartbeat_timestamp_{0};\n\npublic:\n    bool tryBecomeLeader() {\n        State expected = State::FOLLOWER;\n        if (!state_.compare_exchange_strong(\n            expected,\n            State::CANDIDATE,\n            std::memory_order_acq_rel\n        )) {\n            return false;\n        }\n\n        uint64_t new_term = term_.fetch_add(1, std::memory_order_acq_rel) + 1;\n        \/\/ \u9078\u6319\u30d7\u30ed\u30bb\u30b9\u306e\u5b9f\u88c5\n        \/\/ ...\n        return true;\n    }\n\n    void handleHeartbeat(uint64_t leader_term, NodeId leader_id) {\n        uint64_t current_term = term_.load(std::memory_order_acquire);\n        if (leader_term &gt;= current_term) {\n            term_.store(leader_term, std::memory_order_release);\n            current_leader_.store(leader_id, std::memory_order_release);\n            last_heartbeat_timestamp_.store(\n                getCurrentTimestamp(),\n                std::memory_order_release\n            );\n        }\n    }\n};\n\n\/\/ \u5206\u6563\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5\ntemplate&lt;typename K, typename V&gt;\nclass DistributedCache {\nprivate:\n    struct Entry {\n        std::atomic&lt;uint64_t&gt; version{0};\n        std::atomic&lt;bool&gt; valid{false};\n        V value;\n    };\n\n    std::unordered_map&lt;K, Entry&gt; cache_;\n    std::mutex cache_mutex_;\n\npublic:\n    bool put(const K&amp; key, const V&amp; value, uint64_t version) {\n        std::lock_guard&lt;std::mutex&gt; lock(cache_mutex_);\n        auto&amp; entry = cache_[key];\n        uint64_t current_version = entry.version.load(std::memory_order_acquire);\n\n        if (version &gt; current_version) {\n            entry.value = value;\n            entry.version.store(version, std::memory_order_release);\n            entry.valid.store(true, std::memory_order_release);\n            return true;\n        }\n        return false;\n    }\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u65e2\u5b58\u30b3\u30fc\u30c9\u306eatomic\u306b\u3088\u308b\u6700\u9069\u5316\u4e8b\u4f8b<\/h3>\n\n\n\n<p>\u65e2\u5b58\u306e\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30d9\u30fc\u30b9\u306e\u5b9f\u88c5\u3092atomic\u3092\u4f7f\u7528\u3057\u3066\u6700\u9069\u5316\u3057\u305f\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u6700\u9069\u5316\u524d\uff1a\u30df\u30e5\u30fc\u30c6\u30c3\u30af\u30b9\u30d9\u30fc\u30b9\u306e\u5b9f\u88c5\nclass BeforeOptimization {\nprivate:\n    std::mutex mutex_;\n    int counter_{0};\n    bool is_running_{true};\n    std::vector&lt;int&gt; recent_values_;\n\npublic:\n    void increment() {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex_);\n        ++counter_;\n        recent_values_.push_back(counter_);\n        if (recent_values_.size() &gt; 10) {\n            recent_values_.erase(recent_values_.begin());\n        }\n    }\n\n    bool is_running() {\n        std::lock_guard&lt;std::mutex&gt; lock(mutex_);\n        return is_running_;\n    }\n};\n\n\/\/ \u6700\u9069\u5316\u5f8c\uff1aatomic + \u90e8\u5206\u7684\u306a\u30ed\u30c3\u30af\nclass AfterOptimization {\nprivate:\n    std::atomic&lt;int&gt; counter_{0};\n    std::atomic&lt;bool&gt; is_running_{true};\n\n    \/\/ \u5c65\u6b74\u30c7\u30fc\u30bf\u7528\u306e\u5206\u96e2\u3055\u308c\u305f\u4fdd\u8b77\u6a5f\u69cb\n    struct History {\n        std::mutex mutex;\n        std::vector&lt;int&gt; values;\n    };\n    std::unique_ptr&lt;History&gt; history_{std::make_unique&lt;History&gt;()};\n\npublic:\n    void increment() {\n        int new_value = counter_.fetch_add(1, std::memory_order_relaxed) + 1;\n\n        \/\/ \u5c65\u6b74\u306e\u66f4\u65b0\u306f\u5225\u9014\u30ed\u30c3\u30af\u3067\u4fdd\u8b77\n        if (new_value % 10 == 0) {  \/\/ 10\u56de\u306b1\u56de\u3060\u3051\u5c65\u6b74\u3092\u66f4\u65b0\n            std::lock_guard&lt;std::mutex&gt; lock(history_-&gt;mutex);\n            history_-&gt;values.push_back(new_value);\n            if (history_-&gt;values.size() &gt; 10) {\n                history_-&gt;values.erase(history_-&gt;values.begin());\n            }\n        }\n    }\n\n    bool is_running() {\n        return is_running_.load(std::memory_order_relaxed);\n    }\n};<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\u30d1\u30bf\u30fc\u30f3\u306e\u5206\u6790<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u983b\u7e41\u306b\u30a2\u30af\u30bb\u30b9\u3055\u308c\u308b\u5358\u7d14\u306a\u5024\u306fatomic\u306b\u5909\u63db<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306f\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30ed\u30c3\u30af\u3092\u7dad\u6301<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u901f\u5ea6\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n\n\n\n<li>\u4e00\u8cab\u6027\u306e\u8981\u4ef6\u3068\u6027\u80fd\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6bb5\u968e\u7684\u306a\u6700\u9069\u5316<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u307e\u305a\u5358\u7d14\u306a\u5024\u304b\u3089\u958b\u59cb<\/li>\n\n\n\n<li>\u52b9\u679c\u3092\u6e2c\u5b9a\u3057\u306a\u304c\u3089\u7bc4\u56f2\u3092\u62e1\u5927<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; 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