{"id":156,"date":"2024-12-10T11:42:38","date_gmt":"2024-12-10T11:42:38","guid":{"rendered":"https:\/\/www.isvmspace.com\/?p=156"},"modified":"2024-12-10T11:42:38","modified_gmt":"2024-12-10T11:42:38","slug":"volatile%e5%85%b3%e9%94%ae%e5%ad%97%e7%9a%84%e4%bd%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.isvmspace.com\/?p=156","title":{"rendered":"volatile\u5173\u952e\u5b57\u7684\u4f5c\u7528"},"content":{"rendered":"

\u4e3b\u8981\u4f5c\u7528<\/h1>\n
    \n
  1. \u4fdd\u8bc1\u5171\u4eab\u53d8\u91cf\u53ef\u89c1\u6027<\/p>\n<\/li>\n
  2. \n

    \u9632\u6b62\u6307\u4ee4\u91cd\u6392<\/p>\n<\/li>\n<\/ol>\n

    volatile\u5982\u4f55\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u7684\uff1f<\/h1>\n

    volatile\u5173\u952e\u5b57\u901a\u8fc7\u201c\u5185\u5b58\u5c4f\u969c\u201d\u6765\u9632\u6b62\u6307\u4ee4\u88ab\u91cd\u6392\u5e8f\u3002
    \n\u4e0b\u9762\u662f\u57fa\u4e8e\u4fdd\u5b88\u7b56\u7565\u7684JMM\u5185\u5b58\u5c4f\u969c\u63d2\u5165\u7b56\u7565\uff1a<\/p>\n

      \n
    • \u5728\u6bcf\u4e2avolatile\u5199\u64cd\u4f5c\u7684\u524d\u9762\u63d2\u5165\u4e00\u4e2aStoreStore\u5c4f\u969c<\/li>\n
    • \u5728\u6bcf\u4e2avolatile\u5199\u64cd\u4f5c\u7684\u540e\u9762\u63d2\u5165\u4e00\u4e2aStoreLoad\u5c4f\u969c<\/li>\n
    • \u5728\u6bcf\u4e2avolatile\u8bfb\u64cd\u4f5c\u7684\u540e\u9762\u63d2\u5165\u4e00\u4e2aLoadLoad\u5c4f\u969c<\/li>\n
    • \u5728\u6bcf\u4e2avolatile\u8bfb\u64cd\u4f5c\u7684\u540e\u9762\u63d2\u5165\u4e00\u4e2aLoadStore\u5c4f\u969c<\/li>\n<\/ul>\n

      DCL\u5355\u4f8b\u6a21\u5f0f<\/h1>\n

      JDK 1.5\u4e2d\u624d\u5b8c\u5168\u4fee\u590dvolatile\u5c4f\u853d\u6307\u4ee4\u91cd\u6392\u5e8f\u7684\u8bed\u4e49\uff0c\u5728\u6b64\u4e4b\u524d\u65e0\u6cd5\u5b89\u5168\u5730\u4f7f\u7528DCL\uff08\u53cc\u9501\u68c0\u6d4b\uff09\u6765\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u3002<\/p>\n

      public class Singleton {\n    private volatile static Singleton instance;\n\n    public static Singleton getInstance() {\n        if (null == instance) {\n            synchronized (Singleton.class) {\n                if (null == instance) {\n                    instance = new Singleton();\n                }\n            }\n        }\n        return instance;\n    }\n}\n<\/code><\/pre>\n
      \u5206\u6790<\/strong><\/p>\n
      instance = new Singleton();\u5e76\u4e0d\u662f\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5b83\u53ef\u4ee5\u201d\u62bd\u8c61\u201c\u4e3a\u4e0b\u9762\u51e0\u6761JVM\u6307\u4ee4\uff1a
      \nmemory = allocate(); \/\/1\uff1a\u5206\u914d\u5bf9\u8c61\u7684\u5185\u5b58\u7a7a\u95f4
      \ninitInstance(memory); \/\/2\uff1a\u521d\u59cb\u5316\u5bf9\u8c61
      \n instance = memory; \/\/3\uff1a\u8bbe\u7f6einstance\u6307\u5411\u521a\u5206\u914d\u7684\u5185\u5b58\u5730\u5740<\/p>\n
      \u5f53\u53d1\u751f\u6307\u4ee4\u91cd\u6392\u65f6\uff0c\u64cd\u4f5c\u53ef\u80fd\u5982\u4e0b\uff1a
      \nmemory = allocate(); \/\/1\uff1a\u5206\u914d\u5bf9\u8c61\u7684\u5185\u5b58\u7a7a\u95f4
      \ninstance = memory; \/\/3\uff1a\u8bbe\u7f6einstance\u6307\u5411\u521a\u5206\u914d\u7684\u5185\u5b58\u5730\u5740\uff08\u6b64\u65f6\u5bf9\u8c61\u8fd8\u672a\u521d\u59cb\u5316\uff09
      \nctorInstance(memory); \/\/2\uff1a\u521d\u59cb\u5316\u5bf9\u8c61<\/p>\n
      \u6ce8\u610f<\/h3>\n
      volatile\u5173\u952e\u5b57\u4e0d\u80fd\u4fdd\u8bc1\u539f\u5b50\u6027<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u4e3b\u8981\u4f5c\u7528 \u4fdd\u8bc1\u5171\u4eab\u53d8\u91cf\u53ef\u89c1\u6027 \u9632\u6b62\u6307\u4ee4\u91cd\u6392 volatile\u5982\u4f55\u7981\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u7684\uff1f volatile\u5173\u952e\u5b57\u901a\u8fc7 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,16],"tags":[],"_links":{"self":[{"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/posts\/156"}],"collection":[{"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=156"}],"version-history":[{"count":5,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/posts\/156\/revisions"}],"predecessor-version":[{"id":161,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=\/wp\/v2\/posts\/156\/revisions\/161"}],"wp:attachment":[{"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.isvmspace.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}