{"id":85839,"date":"2020-05-12T18:52:32","date_gmt":"2020-05-12T10:52:32","guid":{"rendered":"http:\/\/4563.org\/?p=85839"},"modified":"2020-05-12T18:52:32","modified_gmt":"2020-05-12T10:52:32","slug":"atomicstampedreference-%e7%9a%84-cas-%e6%93%8d%e4%bd%9c%ef%bc%8c%e8%bf%99%e4%b9%88%e7%90%86%e8%a7%a3%e5%af%b9%e5%90%97","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=85839","title":{"rendered":"AtomicStampedReference \u7684 CAS \u64cd\u4f5c\uff0c\u8fd9\u4e48\u7406\u89e3\u5bf9\u5417"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  AtomicStampedReference \u7684 CAS \u64cd\u4f5c\uff0c\u8fd9\u4e48\u7406\u89e3\u5bf9\u5417               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : amiwrong123 <\/span>  <span><i><\/i> 4<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<pre><code>    public boolean compareAndSet(V   expectedReference,                                  V   newReference,                                  int expectedStamp,                                  int newStamp) {         Pair&lt;V&gt; current = pair;         return             \/\/\u65e7\u5f15\u7528\u662f\u76f8\u540c\u7684             expectedReference == current.reference &amp;&amp;             \/\/\u65e7\u7248\u672c\u53f7\u4e5f\u662f\u76f8\u540c\u7684             expectedStamp == current.stamp &amp;&amp;             \/\/\u60f3\u8bbe\u7684\u65b0\u5f15\u7528\u548c\u65b0\u7248\u672c\u53f7\uff0c\u4e5f\u548c\u5f53\u524d\u7684\u76f8\u540c             ((newReference == current.reference &amp;&amp; newStamp == current.stamp) ||              casPair(current, Pair.of(newReference, newStamp)));     } <\/code><\/pre>\n<p>\u5c31\u662f\u4e0a\u9762\u7684<code>((newReference == current.reference &amp;&amp; newStamp == current.stamp) ||<\/code>\u8fd9\u91cc\uff0c\u9996\u5148\u6211\u89c9\u5f97\uff0c\u53ef\u80fd\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u7684\u65f6\u5019\uff0c\u53c2\u6570 expectedReference \u5c31\u662f newReference \u4e00\u6837\u7684\uff0c\u540c\u6837\uff0cexpectedStamp \u548c newStamp \u4e5f\u4e00\u6837\u7684\u3002\u4f46\u662f\u8fd9\u6837\u505a CAS \u64cd\u4f5c\uff0c\u4e0d\u5c31\u76f8\u5f53\u4e8e\u6ca1\u6709\u8fdb\u884c\u8bbe\u7f6e\u5417\uff0c\u53cd\u6b63\u90fd\u662f\u4e00\u6837\u7684\u3002<\/p>\n<p>\u7136\u540e\uff0c\u6211\u53c8\u60f3\u5230\uff0c\u96be\u9053\u8fd9\u91cc\u8fd8\u6709\u53e6\u4e00\u79cd\u60c5\u51b5\u3002\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u65f6\uff0c\u53c2\u6570 expectedReference \u548c newReference \u662f\u4e0d\u4e00\u6837\u7684\uff0cexpectedStamp \u548c newStamp \u4e5f\u4e0d\u4e00\u6837\u7684\u3002\u4f46\u7ebf\u7a0b\u6267\u884c\u5230<code>expectedStamp == current.stamp<\/code>\u5c31\u5207\u6362\u51fa\u53bb\u4e86\uff0c\u7136\u540e\u5207\u6362\u56de\u6765\u4e86\uff0ccurrent \u7684\u4e24\u4e2a\u6210\u5458\u521a\u521a\u88ab\u522b\u7684\u7ebf\u7a0b\u4fee\u6539\u4e86\uff0c\u7136\u540e\u521a\u597d\u901a\u8fc7\u4e86<code>(newReference == current.reference &amp;&amp; newStamp == current.stamp)<\/code>\u7684\u5224\u65ad\uff0c\u4e5f\u5c31\u4e0d\u7528\u6267\u884c casPair \u4e86\u3002<\/p>\n<p>\u5404\u4f4d\u5927\u4f6c\uff0c\u4e0a\u9762\u8fd9\u4e24\u79cd\u60c5\u51b5\uff0c\u6211\u60f3\u5f97\u5bf9\u5417\uff1f<\/p>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>2<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li data-pid=\"1497139\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : orangex <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             \u5e94\u8be5\u53ea\u6709\u524d\u8005\u5427\u3002<br \/>1. return \u8bed\u53e5\u91cc\u524d\u9762\u51e0\u4e2a\u903b\u8f91\u8fd0\u7b97\u662f\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\u5462\uff1f\u6211\u4e5f\u4e0d\u6e05\u695a\uff0c\u5982\u679c\u662f\u7684\u8bdd\uff0c\u90a3\u5c31\u4e0d\u5b58\u5728\u4f60\u8bf4\u7684\u5207\u51fa\u53bb\u7684\u60c5\u51b5\u3002<br \/>2. \u5c31\u7b97\u662f\u522b\u7684\u7ebf\u7a0b\u4fee\u6539\u4e86\uff0cstamp \u8fd9\u91cc\u5e94\u8be5\u7c7b\u4f3c\u7248\u672c\u53f7\u7684\u4f5c\u7528\u5427\uff1f\u8fd9\u4e2a\u201c\u6233\u201d\u53ea\u5e94\u8be5\u8d8a\u6539\u8d8a\u5927\u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li data-pid=\"1497140\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u4e3b<\/span> <span>\u8cc7\u6df1\u5927\u4f6c : amiwrong123 <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             @orangex <br \/>\u7406\u8bba\u4e0a\u7248\u672c\u53f7\u5e94\u8be5\u8d8a\u6765\u8d8a\u5927\uff0c\u4f46\u8fd9\u91cc\u63d0\u4f9b\u7684\u51fd\u6570\uff0c\u5c31\u662f\u968f\u4fbf\u8bbe\u7f6e\u7248\u672c\u53f7\u3002<\/p>\n<p>\u6211\u4e5f\u611f\u89c9\u540e\u8005\u4e0d\u6210\u7acb\u3002\u56e0\u4e3a current \u53ea\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\uff0c\u5c31\u7b97\u7ebf\u7a0b\u5207\u51fa\u53bb\u53c8\u5207\u56de\u6765\uff0c\u6b64\u65f6 current \u5c31\u53d8\u6210\u4e86\u4e00\u4e2a\u5b64\u513f\u4e86\uff08\u53ea\u6709 current \u5c40\u90e8\u5f15\u7528\u6307\u5411\u5b83\uff09\uff0c\u5047\u8bbe\u5176\u4ed6\u7ebf\u7a0b \u8d81\u4f60\u5207\u51fa\u53bb\u66f4\u65b0\u4e86 pair \u5bf9\u8c61\u3002\u6b64\u65f6\uff0cpair \u6210\u5458\u4e00\u5b9a\u662f\u65b0\u7684 pair \u5bf9\u8c61\u3002\u6b64\u65f6\uff0c\u518d\u901a\u8fc7 casPair \u5224\u65ad\uff0c\u53d1\u73b0 current \u5c40\u90e8\u53d8\u91cf\u5c31\u4e0d\u662f\u65e7\u5f15\u7528\u4e86\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>AtomicStampedRefe&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/85839"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=85839"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/85839\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=85839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=85839"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=85839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}