{"id":3880,"date":"2025-07-12T13:48:11","date_gmt":"2025-07-12T05:48:11","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3880"},"modified":"2025-07-12T13:48:11","modified_gmt":"2025-07-12T05:48:11","slug":"abstractqueuedsynchronized%e4%b8%ba%e4%bb%80%e4%b9%88%e9%87%87%e7%94%a8%e5%8f%8c%e5%90%91%e9%93%be%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/12\/abstractqueuedsynchronized%e4%b8%ba%e4%bb%80%e4%b9%88%e9%87%87%e7%94%a8%e5%8f%8c%e5%90%91%e9%93%be%e8%a1%a8\/","title":{"rendered":"AbstractQueuedSynchronized\u4e3a\u4ec0\u4e48\u91c7\u7528\u53cc\u5411\u94fe\u8868"},"content":{"rendered":"\n<p><code>AbstractQueuedSynchronizer<\/code>\uff08\u7b80\u79f0 <strong>AQS<\/strong>\uff09\u662f Java \u5e76\u53d1\u5305\uff08<code>java.util.concurrent.locks<\/code>\uff09\u4e2d\u6700\u6838\u5fc3\u7684\u540c\u6b65\u6846\u67b6\u4e4b\u4e00\uff0c\u5982 <code>ReentrantLock<\/code>\u3001<code>Semaphore<\/code>\u3001<code>CountDownLatch<\/code>\u3001<code>FutureTask<\/code> \u7b49\u90fd\u57fa\u4e8e\u5b83\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u5728 AQS \u7684\u5b9e\u73b0\u4e2d\uff0c\u5b83\u4f7f\u7528\u4e86\u4e00\u4e2a<strong>\u53cc\u5411\u94fe\u8868\uff08\u53cc\u5411\u7b49\u5f85\u961f\u5217\uff09<\/strong>\u6765\u7ba1\u7406<strong>\u83b7\u53d6\u540c\u6b65\u72b6\u6001\u5931\u8d25\u7684\u7ebf\u7a0b<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001AQS \u4e3a\u4ec0\u4e48\u91c7\u7528\u53cc\u5411\u94fe\u8868\uff1f<\/h2>\n\n\n\n<p>AQS \u4f7f\u7528\u7684\u961f\u5217\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a <strong>CLH\uff08Craig, Landin, and Hagersten\uff09\u53d8\u79cd\u961f\u5217<\/strong>\uff0c\u662f\u4e00\u4e2a<strong>FIFO \u7684\u53cc\u5411\u94fe\u8868\u7ed3\u6784<\/strong>\uff0c\u7528\u4e8e\u7ebf\u7a0b\u7684\u6392\u961f\u4e0e\u5524\u9192\u63a7\u5236\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u6838\u5fc3\u7406\u7531\uff1a<strong>\u652f\u6301\u7ebf\u7a0b\u963b\u585e\u6392\u961f + \u9ad8\u6548\u5524\u9192 + \u72b6\u6001\u4f20\u64ad<\/strong>\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u4e3a\u4ec0\u4e48\u4e0d\u7528\u5355\u5411\u94fe\u8868\uff1f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">AQS \u9009\u62e9\u53cc\u5411\u94fe\u8868\u7684\u5173\u952e\u539f\u56e0\u5982\u4e0b\uff1a<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u539f\u56e0<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td>\u2705 <strong>\u5feb\u901f\u627e\u5230\u524d\u9a71\u8282\u70b9<\/strong><\/td><td>\u7528\u4e8e\u5224\u65ad\u5f53\u524d\u7ebf\u7a0b\u662f\u5426\u662f\u961f\u5217\u5934\u7684\u4e0b\u4e00\u4e2a\uff08\u662f\u5426\u53ef\u5524\u9192\uff09<\/td><\/tr><tr><td>\u2705 <strong>\u8282\u70b9\u53d6\u6d88\u540e\u53ef\u5feb\u901f\u6e05\u7406\u94fe\u8868<\/strong><\/td><td>\u82e5\u67d0\u7ebf\u7a0b\u8d85\u65f6\u6216\u4e2d\u65ad\u9000\u51fa\uff0c\u53ef\u5feb\u901f\u901a\u8fc7 <code>prev<\/code> \u6307\u9488\u4fee\u590d\u961f\u5217<\/td><\/tr><tr><td>\u2705 <strong>\u9ad8\u6548\u4f20\u64ad\u5524\u9192\u4fe1\u53f7<\/strong><\/td><td>\u9700\u8981\u5411\u524d\/\u5411\u540e\u4f20\u64ad\u5524\u9192\u72b6\u6001<\/td><\/tr><tr><td>\u2705 <strong>\u7075\u6d3b\u652f\u6301\u516c\u5e73\u9501\/\u975e\u516c\u5e73\u9501<\/strong><\/td><td>\u524d\u9a71\u53ef\u63a7\uff0c\u6709\u5229\u4e8e\u5224\u65ad\u662f\u5426\u6392\u961f\u3001\u53ef\u91cd\u5165<\/td><\/tr><tr><td>\u274c \u5355\u5411\u94fe\u8868\u65e0\u6cd5\u5411\u524d\u904d\u5386<\/td><td>\u96be\u4ee5\u5b9e\u73b0\u8d85\u65f6\/\u4e2d\u65ad\u540e\u6e05\u7406\u8282\u70b9\u548c\u961f\u5217\u4fee\u590d<\/td><\/tr><tr><td>\u274c \u5355\u5411\u94fe\u8868\u65e0\u6cd5\u6e05\u6670\u8868\u8fbe\u201c\u963b\u585e\u5173\u7cfb\u201d<\/td><td>AQS \u9700\u8981\u7ef4\u62a4\u8c01\u963b\u585e\u8c01\u3001\u8c01\u5524\u9192\u8c01\u7684\u660e\u786e\u5173\u7cfb<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001AQS \u4e2d\u53cc\u5411\u94fe\u8868\u7ed3\u6784\u7b80\u8ff0<\/h2>\n\n\n\n<p>AQS \u7684\u53cc\u5411\u94fe\u8868\u7ef4\u62a4\u7684\u4e0d\u662f\u7ebf\u7a0b\uff0c\u800c\u662f<strong>Node \u8282\u70b9<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>static final class Node {\n    volatile Node prev;    \/\/ \u524d\u9a71\n    volatile Node next;    \/\/ \u540e\u7ee7\n    volatile Thread thread;\n    volatile int waitStatus; \/\/ \u72b6\u6001\u503c\uff08SIGNAL, CANCELLED \u7b49\uff09\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u94fe\u8868\u7ed3\u6784\u793a\u610f\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>head &lt;-&gt; node1 &lt;-&gt; node2 &lt;-&gt; node3 ... &lt;-&gt; tail<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7279\u70b9\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u9501\u5931\u8d25\u540e\uff0c\u4f1a\u88ab\u5c01\u88c5\u6210\u4e00\u4e2a Node \u653e\u5165\u94fe\u8868\u672b\u5c3e<\/li>\n\n\n\n<li>\u524d\u9a71\u8282\u70b9\u51b3\u5b9a\u5f53\u524d\u8282\u70b9\u662f\u5426\u53ef\u4ee5\u7ee7\u7eed\u5c1d\u8bd5\u83b7\u53d6\u9501<\/li>\n\n\n\n<li>\u5982\u679c\u5f53\u524d\u8282\u70b9\u88ab\u53d6\u6d88\u4e86\uff08\u5982\u4e2d\u65ad\u3001\u8d85\u65f6\uff09\uff0c\u53ef\u901a\u8fc7 <code>prev\/next<\/code> \u5feb\u901f\u4fee\u590d\u7ed3\u6784<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u771f\u5b9e\u573a\u666f\u4e0b\u7684\u64cd\u4f5c\u6f14\u793a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u5165\u961f<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>tail.next = newNode;\nnewNode.prev = tail;\ntail = newNode;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u51fa\u961f\u5524\u9192<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>if (head.next.waitStatus == Node.SIGNAL) {\n    LockSupport.unpark(head.next.thread); \/\/ \u5524\u9192\u4e0b\u4e00\u4e2a\u8282\u70b9\u7ebf\u7a0b\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u8282\u70b9\u53d6\u6d88\u6216\u5f02\u5e38\u5904\u7406\uff08\u6e05\u9664\u961f\u5217\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u524d\u9a71\u8282\u70b9\u7684 next \u88ab\u6e05\u7406\nnode.prev.next = node.next;\n\/\/ \u540e\u7ee7\u8282\u70b9\u7684 prev \u88ab\u4fee\u590d\nnode.next.prev = node.prev;<\/code><\/pre>\n\n\n\n<p>\u53ea\u6709\u53cc\u5411\u94fe\u8868\u624d\u80fd\u9ad8\u6548\u5b8c\u6210\u8fd9\u4e9b\u4fee\u590d\u5de5\u4f5c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u4e3a\u4ec0\u4e48\u4e0d\u4f7f\u7528\u5176\u4ed6\u7ed3\u6784\uff08\u6bd4\u5982\u6570\u7ec4\u3001\u961f\u5217\u7c7b\u7b49\uff09\uff1f<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u6570\u636e\u7ed3\u6784<\/th><th>\u4e0d\u9002\u5408 AQS \u7684\u539f\u56e0<\/th><\/tr><\/thead><tbody><tr><td>\u6570\u7ec4<\/td><td>\u7a7a\u95f4\u56fa\u5b9a\u3001\u4e0d\u9002\u5408\u9891\u7e41\u63d2\u5165\u5220\u9664<\/td><\/tr><tr><td>\u5355\u5411\u94fe\u8868<\/td><td>\u65e0\u6cd5\u5411\u524d\u56de\u6eaf\u4fee\u590d\u3001\u53d6\u6d88\u8282\u70b9\u590d\u6742<\/td><\/tr><tr><td>\u961f\u5217\u7c7b\uff08\u5982 ConcurrentLinkedQueue\uff09<\/td><td>\u65e0\u6cd5\u5b9a\u5236\u5524\u9192\u903b\u8f91\u3001\u4e0d\u652f\u6301\u524d\u9a71\u53ef\u63a7\u7b56\u7565<\/td><\/tr><tr><td>\u6808\u7ed3\u6784<\/td><td>\u4e0d\u662f FIFO\uff0c\u4e0d\u7b26\u5408\u516c\u5e73\u6027\u539f\u5219<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u76f8\u5173\u6e90\u7801\u5165\u53e3<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>AQS \u7c7b\u5b9a\u4e49\uff1a<br><a href=\"https:\/\/github.com\/openjdk\/jdk\/blob\/master\/src\/java.base\/share\/classes\/java\/util\/concurrent\/locks\/AbstractQueuedSynchronizer.java\"><code>AbstractQueuedSynchronizer.java<\/code><\/a><\/li>\n\n\n\n<li>\u5173\u952e\u65b9\u6cd5\uff1a<\/li>\n\n\n\n<li><code>acquire()<\/code> \/ <code>release()<\/code><\/li>\n\n\n\n<li><code>addWaiter(Node mode)<\/code><\/li>\n\n\n\n<li><code>enq(Node node)<\/code><\/li>\n\n\n\n<li><code>unparkSuccessor(Node node)<\/code><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udcd8\u300aJava \u5e76\u53d1\u7f16\u7a0b\u5b9e\u6218\u300b\uff1aAQS \u67b6\u6784\u7ae0\u8282<\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/github.com\/openjdk\/jdk\/blob\/master\/src\/java.base\/share\/classes\/java\/util\/concurrent\/locks\/AbstractQueuedSynchronizer.java\">AQS \u6e90\u7801\u89e3\u6790\uff08JDK \u5b98\u65b9\u6e90\u7801\uff09<\/a><\/li>\n\n\n\n<li>\ud83d\udd17 <a href=\"https:\/\/en.wikipedia.org\/wiki\/CLH_lock\">CLH Queue Wiki<\/a><\/li>\n\n\n\n<li>\ud83d\udcd8 \u300a\u6df1\u5165\u7406\u89e3 Java \u865a\u62df\u673a\u300b\u5e76\u53d1\u7ae0\u8282<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u603b\u7ed3\u53e3\u8bc0<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u540c\u6b65\u963b\u585e\u9760\u6392\u961f\uff0c\u7ebf\u7a0b\u5931\u8d25\u6302\u94fe\u5c3e\uff1b\u53cc\u5411\u7ed3\u6784\u4fee\u8282\u70b9\uff0c\u5524\u9192\u4f20\u9012\u6700\u7075\u6d3b\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>AbstractQueuedSynchronizer\uff08\u7b80\u79f0 AQS\uff09\u662f Java \u5e76\u53d1\u5305\uff08java.util. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3881,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-3880","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3880","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3880"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3880\/revisions"}],"predecessor-version":[{"id":3882,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3880\/revisions\/3882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3881"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3880"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3880"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3880"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}