{"id":167378,"date":"2020-10-14T22:09:21","date_gmt":"2020-10-14T14:09:21","guid":{"rendered":"http:\/\/4563.org\/?p=167378"},"modified":"2020-10-14T22:09:21","modified_gmt":"2020-10-14T14:09:21","slug":"%e5%85%b3%e4%ba%8e-synchronized-%e5%85%b3%e9%94%ae%e5%ad%97%e7%9a%84%e7%96%91%e9%97%ae","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=167378","title":{"rendered":"\u5173\u4e8e synchronized \u5173\u952e\u5b57\u7684\u7591\u95ee"},"content":{"rendered":"
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\u5173\u4e8e synchronized \u5173\u952e\u5b57\u7684\u7591\u95ee <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : MeloForsaken <\/span> <\/i> 0<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u5728\u8bb8\u591a\u6587\u7ae0\u4e2d\u770b\u5230 synchronized \u4f1a\u6709\u591a\u79cd\u9501\u7684\u7c7b\u578b\uff0c\u53ea\u6709\u5230\u6700\u540e\u624d\u4f1a\u5347\u7ea7\u5230\u91cd\u91cf\u7ea7\u9501\uff0c\u4f46\u662f\u5728 JDK1.8 \u4e0b\u968f\u4fbf\u7528\u4e2a synchronized \u5c31\u80fd\u770b\u5230 monitor.enter \u548c monitor.exit \u5b57\u8282\u7801\u6307\u4ee4\uff0c\u8fd9\u4e0d\u5c31\u77db\u76fe\u4e86\u5417\uff1f\u90a3\u4e48\u524d\u9762\u7684\u8f7b\u91cf\u7ea7\u9501\u3001\u81ea\u65cb\u9501\u7b49\u7b49\u53bb\u54ea\u513f\u4e86\uff1f\u8fd8\u662f\u8bf4 monitor \u4e0d\u662f\u91cd\u91cf\u7ea7\u9501\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (8<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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  • \n
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    \u8cc7\u6df1\u5927\u4f6c : ZSeptember <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8fd9\u79cd\u9501\u4e0d\u662f\u5b57\u8282\u7801\u7ea7\u522b\u7684\uff0c\u662f JVM \u5185\u90e8\u5b9e\u73b0\uff0c\u6ca1\u6709\u66b4\u9732\u7ed9\u5b57\u8282\u7801\u3002
    \u5176\u5b9e\uff0c\u504f\u5411\u9501\u7528\u5904\u4e0d\u662f\u90a3\u4e48\u7684\u5927\uff0c\u73b0\u5728\u5df2\u7ecf\u6709 JEP \u53bb\u5220\u9664\u504f\u5411\u9501\u4e86\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : user8341 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u8bb8\u591a\u6587\u7ae0\uff1f\u4ec0\u4e48\u6587\u7ae0\u554a\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : geelaw <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e3b\u770b\u7684\u6587\u7ae0\u91cc\u8bf4 synchronized \u9501\u6709\u591a\u79cd\u72b6\u6001\u4e14\u4f1a\u53d8\u5316\uff0c\u7136\u540e\u53c8\u95ee monitor \uff08\u7ba1\u7a0b\uff09\u9501\u662f\u4ec0\u4e48\uff0c\u663e\u7136\u662f\u6ca1\u6709\u7406\u89e3 synchronized \u7684\u539f\u7406\u3001Java \u5bf9\u8c61\u7ed3\u6784\u3001\u4ec0\u4e48\u662f Java \u5bf9\u8c61\u7684\u7ba1\u7a0b\u3002<\/p>\n

    Java \u5bf9\u8c61\u7684\u7ba1\u7a0b = \u53ef\u4ee5\u7528 synchronized \u8bbf\u95ee\u7684\u90a3\u4e2a\u540c\u6b65\u673a\u5236\uff0c\u6240\u8c13 synchronized \u4e0d\u8fc7\u662f\u8bbf\u95ee monitor \u7684\u8bed\u6cd5\u673a\u5236\uff0c\u800c\u201csynchronized \u6240\u7528\u7684\u9501\u4f1a\u53d8\u5316\u201d\u5c31\u662f\u8bf4 Java \u5bf9\u8c61\u7ba1\u7a0b\u91cc\u7684\u9501\u4f1a\u53d8\u5316\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
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    \u8cc7\u6df1\u5927\u4f6c : yanyueio <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    #1 \u6b63\u89e3\uff0c\u4f46\u8c08\u5e95\u5c42\u7684\u65f6\u5019\uff0c\u4e00\u5b9a\u8981\u6ce8\u660e\u662f\u54ea\u4e2a jdk \u7248\u672c\uff0c\u4ec0\u4e48\u7248\u672c\u7684 jdk\uff0c\u6700\u597d\u770b\u4e00\u4e0b\u5176\u63d0\u4ea4 commit id\uff0c\u751a\u81f3\u662f\u4ec0\u4e48\u865a\u62df\u673a\u6267\u884c\u7684\uff0c\u7f16\u8bd1\u662f\u4ec0\u4e48 javac \u5de5\u5177\u3002\uff08\u666e\u901a\u6700\u597d\uff09<\/p>\n

    \u9996\u5148 synchronized \u672c\u6765\u5c31\u6709\u9690\u5f0f\u76d1\u89c6\u5668\u5b9e\u73b0\uff0c\u514d\u9664\u4f60\u624b\u52a8\u52a0\u9501\u7684\u90a3\u4e9b\u6bd4\u5982 reenter lock, unlock()\u3002
    synchronized \u662f\u6392\u4ed6\u9501\uff0c\u6240\u4ee5\u5b57\u8282\u7801\u53ef\u4ee5\u770b\u5230\u76d1\u89c6\u5668\uff0c\u5f88\u6b63\u5e38\uff08 java \u5185\u90e8\u8fd8\u6709\u54ea\uff1f\u5c31\u662f\u89e3\u91ca\u6267\u884c\u5b57\u8282\u7801\u554a\uff09\u7ed1\u5b9a\u5230\u5f53\u524d\u5bf9\u8c61\u4e0a\uff0c\u76f8\u5bf9\u7684\u90a3\u4e9b\u53ef\u91cd\u5165\u9501\uff0c\u81ea\u65cb\u9501\u7b49\u8f7b\u91cf\u9501\u7531\u4e8e\u5f15\u5165\u4e86\u66f4\u591a\u529f\u80fd\u624d\u4e0d\u4e00\u5b9a\u4f1a\u6709 monitor \u8fd9\u7c7b\u76d1\u89c6\u5668\u3002\u6bd4\u5982\u6211\u4eec\u5728 C++ \u91cc\u9762\u5c31\u4f1a\u5229\u7528\u53d8\u91cf\u4f5c\u7528\u57df\u6765\u4ee3\u66ff\u9501\uff0c\u4f5c\u7528\u57df\u7ed3\u675f\uff0c\u81ea\u52a8\u89e3\u9501(\u56e0\u4e3a\u5bf9\u8c61\u88ab\u6536\u8d70\u5566)\u3002<\/p>\n

    monitor \u53ea\u662f\u4e00\u79cd\u5b9e\u73b0\u9501\u7684\u673a\u5236(\u7ed1\u5b9a\u5230”\u5b57\u8282\u7801\u5bf9\u8c61”\u4e0a)\uff0c\u53ef\u7b97\u4f5c\u6392\u4ed6\u9501(\u91cd\u91cf\u7ea7)\u9501\u5b9e\u73b0\u989d\u624b\u6bb5\u3002<\/p>\n

    \u201c\u53ea\u6709\u5230\u6700\u540e\u624d\u4f1a\u5347\u7ea7\u5230\u91cd\u91cf\u7ea7\u9501\u201d — \u6700\u540e\uff1f\u55b5\u55b5\u55b5\u3002<\/p>\n

    \u6b6a\u5634\uff0c\u6211\u7406\u89e3\u4e3b\u6240\u8bf4 “\u6700\u540e” \u662f\u6307\u8fd0\u884c\u9636\u6bb5\uff0c\u800c\u4e0d\u662f\u7f16\u8bd1\u65f6\u3002\u574f\u7b11\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : MeloForsaken <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @ZSeptember @geelaw @user8341 @yanyueio
    “\u4e8b\u5b9e\u4e0a\uff0c\u53ea\u6709\u5728 JDK1.6 \u4e4b\u524d\uff0csynchronized \u7684\u5b9e\u73b0\u624d\u4f1a\u76f4\u63a5\u8c03\u7528 ObjectMonitor \u7684 enter \u548c exit\uff0c\u8fd9\u79cd\u9501\u88ab\u79f0\u4e4b\u4e3a\u91cd\u91cf\u7ea7\u9501\u3002”
    \u8fd9\u53e5\u8bdd\u662f\u4e0d\u662f\u6709\u70b9\u95ee\u9898\uff0c\u5982\u679c\u8bf4\u91cd\u91cf\u7ea7\u9501\u624d\u4f1a\u6709 enter \u548c exit \u5b57\u8282\u7801\u6307\u4ee4\u7684\u8bdd\uff0c\u90a3\u4e3a\u4ec0\u4e48 JDK1.8 \u4e0b\u968f\u4fbf\u5199\u4e2a synchronized \u4ee3\u7801\u5757\u7684 demo \u53cd\u7f16\u8bd1\u540e\u7684\u5b57\u8282\u7801\u6307\u4ee4\u91cc\u9762\u4f1a\u6709 enter \u548c exit\uff0c\u8fd9\u4e0d\u8868\u793a synchronized \u9ed8\u8ba4\u4f7f\u7528\u91cd\u91cf\u7ea7\u9501?\u8fd8\u662f\u8bf4\u504f\u5411\u9501\u3001\u8f7b\u91cf\u7ea7\u9501\u4e5f\u4f1a\u6d89\u53ca\u5230 enter \u548c exit \u6307\u4ee4?
    \u8c22\u8c22\uff01\uff01\uff01 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : geelaw <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @MeloForsaken #5 \u8bf7\u4f60 cite \u5185\u5bb9\u7684\u65f6\u5019\u7ed9\u51fa\u94fe\u63a5\u3002
    \u53e6\u5916\u4f60\u4f3c\u4e4e\u6ca1\u6709\u641e\u61c2 object monitor \u548c ObjectMonitor \u548c monitorenter \u7684\u5173\u7cfb\u3002<\/p>\n

    Object monitor \u662f\u82f1\u6587\u8bcd\u7ec4\uff0c\u610f\u601d\u662f\u5bf9\u8c61\u7684\u7ba1\u7a0b\uff0c\u8fd9\u662f\u4e00\u4e2a\u6982\u5ff5\u3002
    ObjectMonitor \u662f JDK \u6e90\u4ee3\u7801\u91cc\u7c7b\u7684\u540d\u5b57\uff0c\u5b83\u662f object monitor \u8fd9\u4e2a\u6982\u5ff5\u7684\u662f\u4e00\u4e2a\u5b9e\u73b0\u3002
    monitorenter \u662f\u4e00\u4e2a Java \u5b57\u8282\u7801\u6307\u4ee4\uff0c\u5b83\u7684\u610f\u601d\u662f\u201c\u8fdb\u5165\u5bf9\u8c61\u7684\u7ba1\u7a0b\u201d\uff0c\u5373\u5b83\u7684\u4f5c\u7528\u5bf9\u8c61\u662f object monitor \u8fd9\u4e2a\u6982\u5ff5\uff0c\u81f3\u4e8e\u662f\u8c03\u7528 ObjectMonitor \u7684\u65b9\u6cd5\u8fd8\u662f\u600e\u4e48\u6837\uff0c\u90a3\u662f\u5b9e\u73b0\u7ec6\u8282\uff0c\u53d6\u51b3\u4e8e object monitor \u7684\u72b6\u6001\u3002<\/p>\n

    \u8981\u7406\u89e3 Java \u7684\u540c\u6b65\u673a\u5236\uff0c\u9996\u5148\u9700\u8981\u7406\u89e3\u4e0d\u7279\u5b9a\u4e8e Java \u7684\u540c\u6b65\u673a\u5236\u3002\u4f60\u95ee\u7684\u95ee\u9898\u4f3c\u4e4e\u662f\u6ca1\u6709\u641e\u6e05\u695a\u540c\u6b65\u673a\u5236\uff08\u7ba1\u7a0b\uff09\u3001Java \u540c\u6b65\u673a\u5236\uff08 Java \u5bf9\u8c61\u7684\u7ba1\u7a0b\u3001monitorenter \uff09\u3001Java \u540c\u6b65\u673a\u5236\u7684\u5b9e\u73b0\uff08 ObjectMonitor \u7c7b\uff09\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n

    \u6362\u8a00\u4e4b\uff0c\u4f60\u6240\u8c13\u7684\u201c\u91cd\u91cf\u7ea7\u9501\u201d\u662f ObjectMonitor\uff0c\u4e00\u4e2a Java \u5bf9\u8c61\u7684\u7ba1\u7a0b\u53ef\u80fd\u662f\u7528 ObjectMonitor \u5b9e\u73b0\u7684\uff0c\u4e5f\u53ef\u80fd\u662f\u7528\u522b\u7684\u4ee3\u7801\u5b9e\u73b0\u7684\uff0c\u800c\u4e14\u540c\u4e00\u4e2a\u5bf9\u8c61\u7684\u7ba1\u7a0b\u53ef\u4ee5\u4e00\u4f1a\u513f\u4e0d\u7528 ObjectMonitor \u4e00\u4f1a\u513f\u7528\uff0c\u800c monitorenter \u7684\u5b9e\u9645\u6548\u679c\u662f\u6839\u636e\u5bf9\u8c61\u7ba1\u7a0b\u7684\u5b9e\u73b0\u51b3\u5b9a\u7684\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : MeloForsaken <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @geelaw \u7406\u89e3\u4e86\uff0c\u611f\u8c22 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \u8cc7\u6df1\u5927\u4f6c : user8341 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @MeloForsaken <\/p>\n

    \u6211\u89c9\u5f97\u5982\u679c\u771f\u7684\u771f\u7684\u5f88\u60f3\u641e\u6e05\u695a\u7684\u8bdd\uff0c\u53ef\u4ee5\u53bb\u770b\u770b Hotspot \u7684\u6e90\u7801\u3002<\/p>\n

    hg.openjdk.java.net\/jdk8u\/jdk8u\/hotspot\/file\/tip\/src\/share\/vm\/interpreter\/bytecodeInterpreter.cpp#l1816 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    \u5173\u4e8e synchronized \u5173…<\/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\/167378"}],"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=167378"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/167378\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=167378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=167378"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=167378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}