{"id":37279,"date":"2023-12-11T14:40:51","date_gmt":"2023-12-11T06:40:51","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37279"},"modified":"2023-12-11T14:40:51","modified_gmt":"2023-12-11T06:40:51","slug":"aqs-%e5%8e%9f%e7%90%86%e5%88%86%e6%9e%90-%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/aqs-%e5%8e%9f%e7%90%86%e5%88%86%e6%9e%90-%ef%bc%9f\/","title":{"rendered":"AQS \u539f\u7406\u5206\u6790 \uff1f"},"content":{"rendered":"

“`” AQS\u6838\u5fc3\u601d\u60f3\u662f\uff0c\u5982\u679c\u88ab\u8bf7\u6c42\u7684\u5171\u4eab\u8d44\u6e90\u7a7a\u95f2\uff0c\u5219\u5c06\u5f53\u524d\u8bf7\u6c42\u8d44\u6e90\u7684\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u6709\u6548\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff0c\u5e76\u4e14\u5c06\u5171\u4eab\u8d44\u6e90\u8bbe\u7f6e\u4e3a\u9501\u5b9a\u72b6\u6001\u3002\u5982\u679c\u88ab\u8bf7\u6c42\u7684\u5171\u4eab\u8d44\u6e90\u88ab\u5360\u7528\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u4e00\u5957\u7ebf\u7a0b\u963b\u585e\u7b49\u5f85\u4ee5\u53ca\u88ab\u5524\u9192\u65f6\u9501\u5206\u914d\u7684\u673a\u5236\uff0c\u8fd9\u4e2a\u673a\u5236AQS\u662f\u7528CLH\u961f\u5217\u9501\u5b9e\u73b0\u7684\uff0c\u5373\u5c06\u6682\u65f6\u83b7\u53d6\u4e0d\u5230\u9501\u7684\u7ebf\u7a0b\u52a0\u5165\u5230\u961f\u5217\u4e2d\u3002<\/strong><\/p>\n

<blockquote>CLH(Craig,Landin,and Hagersten)\u961f\u5217\u662f\u4e00\u4e2a\u865a\u62df\u7684\u53cc\u5411\u961f\u5217\uff08\u865a\u62df\u7684\u53cc\u5411\u961f\u5217\u5373\u4e0d\u5b58\u5728\u961f\u5217\u5b9e\u4f8b\uff0c\u4ec5\u5b58\u5728\u7ed3\u70b9\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb\uff09\u3002AQS\u662f\u5c06\u6bcf\u6761\u8bf7\u6c42\u5171\u4eab\u8d44\u6e90\u7684\u7ebf\u7a0b\u5c01\u88c5\u6210\u4e00\u4e2aCLH\u9501\u961f\u5217\u7684\u4e00\u4e2a\u7ed3\u70b9\uff08Node\uff09\u6765\u5b9e\u73b0\u9501\u7684\u5206\u914d\u3002<\/p><\/blockquote><\/p>\n

<p>\u770b\u4e2aAQS(AbstractQueuedSynchronizer)\u539f\u7406\u56fe\uff1a<\/p>\n

<img alt=""enter image description here"" src=""https:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/Java%20%E7%A8%8B%E5%BA%8F%E5%91%98%E5%BF%85%E5%A4%87%EF%BC%9A%E5%B9%B6%E5%8F%91%E7%9F%A5%E8%AF%86%E7%B3%BB%E7%BB%9F%E6%80%BB%E7%BB%93\/CLH.png"" style=""width: 100%;""><\/p>\n

AQS\u4f7f\u7528\u4e00\u4e2aint\u6210\u5458\u53d8\u91cf\u6765\u8868\u793a\u540c\u6b65\u72b6\u6001\uff0c\u901a\u8fc7\u5185\u7f6e\u7684FIFO\u961f\u5217\u6765\u5b8c\u6210\u83b7\u53d6\u8d44\u6e90\u7ebf\u7a0b\u7684\u6392\u961f\u5de5\u4f5c\u3002AQS\u4f7f\u7528CAS\u5bf9\u8be5\u540c\u6b65\u72b6\u6001\u8fdb\u884c\u539f\u5b50\u64cd\u4f5c\u5b9e\u73b0\u5bf9\u5176\u503c\u7684\u4fee\u6539\u3002<\/p>\n

<code>javaprivate volatile int state;\/\/\u5171\u4eab\u53d8\u91cf\uff0c\u4f7f\u7528volatile\u4fee\u9970\u4fdd\u8bc1\u7ebf\u7a0b\u53ef\u89c1\u6027<\/code><\/p>\n

\u72b6\u6001\u4fe1\u606f\u901a\u8fc7protected\u7c7b\u578b\u7684<code>getState<\/code>\uff0c<code>setState<\/code>\uff0c<code>compareAndSetState<\/code>\u8fdb\u884c\u64cd\u4f5c<\/p>\n

<pre><code>java\/\/\u8fd4\u56de\u540c\u6b65\u72b6\u6001\u7684\u5f53\u524d\u503cprotected final int getState() { return state;} \/\/ \u8bbe\u7f6e\u540c\u6b65\u72b6\u6001\u7684\u503cprotected final void setState(int newState) { state = newState;}\/\/\u539f\u5b50\u5730\uff08CAS\u64cd\u4f5c\uff09\u5c06\u540c\u6b65\u72b6\u6001\u503c\u8bbe\u7f6e\u4e3a\u7ed9\u5b9a\u503cupdate\u5982\u679c\u5f53\u524d\u540c\u6b65\u72b6\u6001\u7684\u503c\u7b49\u4e8eexpect\uff08\u671f\u671b\u503c\uff09protected final boolean compareAndSetState(int expect, int update) { return unsafe.compareAndSwapInt(this, stateOffset, expect, update);}<\/code><\/pre><\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” AQS\u6838\u5fc3\u601d\u60f3\u662f\uff0c\u5982\u679c\u88ab\u8bf7\u6c42\u7684\u5171\u4eab\u8d44\u6e90\u7a7a\u95f2\uff0c\u5219\u5c06\u5f53\u524d\u8bf7\u6c42\u8d44\u6e90\u7684\u7ebf\u7a0b\u8bbe\u7f6e\u4e3a\u6709\u6548\u7684 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37279","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37279"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37279\/revisions"}],"predecessor-version":[{"id":37280,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37279\/revisions\/37280"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37279"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}