{"id":1018,"date":"2016-12-18T10:52:06","date_gmt":"2016-12-18T02:52:06","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=1018"},"modified":"2016-12-18T10:52:06","modified_gmt":"2016-12-18T02:52:06","slug":"java-%e7%ba%bf%e7%a8%8b%e5%90%8c%e6%ad%a5-synchronized-%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=1018","title":{"rendered":"java \u7ebf\u7a0b\u540c\u6b65 synchronized \u8be6\u89e3"},"content":{"rendered":"

\n\tsynchronized\u65e2\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u53c8\u4fdd\u8bc1\u5185\u5b58\u53ef\u89c1\u6027\uff0c\u662f\u4e00\u79cd\u7ebf\u7a0b\u540c\u6b65\u7684\u65b9\u5f0f\uff0c\u662f\u9501\u673a\u5236\u7684\u4e00\u79cdjava\u5b9e\u73b0\u3002synchronized\u7684\u5b9e\u73b0\u57fa\u4e8eJVM\u5e95\u5c42\uff0cJVM\u662f\u57fa\u4e8emonitor\u5b9e\u73b0\u7684\uff0c\u800cmonitor\u7684\u5b9e\u73b0\u4f9d\u8d56\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e92\u65a5\u5b9e\u73b0\u3002\n<\/p>\n

\n\tsynchronized \u8bed\u4e49
\n<\/h2>\n

\n\tsynchronized\u8bed\u4e49\u662f\u540c\u6b65\uff0c\u4f46\u540c\u6b65\u6709\u4e24\u5c42\u542b\u4e49\uff1a\n<\/p>\n

\n

\n\t\t\u4e92\u65a5\uff0c\u5373\u9501\u7684\u7279\u70b9\u3002\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6301\u6709\u76d1\u89c6\u5668\uff0c\u56e0\u6b64\u4e00\u65e6\u7ebf\u7a0b\u8fdb\u5165\u76d1\u89c6\u5668\u4fdd\u62a4\u7684\u4ee3\u7801\u5757\uff08\u5373\u4e34\u754c\u533a\uff09\uff0c\u5176\u4ed6\u7ebf\u7a0b\u662f\u4e0d\u5141\u8bb8\u76d1\u89c6\u5668\u4fdd\u62a4\u7684\u4ee3\u7801\u5757\uff0c\u76f4\u5230\u524d\u4e00\u4e2a\u7ebf\u7a0b\u9000\u51fa\u4ee3\u7801\u5757\u3002\u4e92\u65a5\u963b\u6b62\u4e86\u5176\u4ed6\u7ebf\u7a0b\u770b\u5230\u5bf9\u8c61\u4e0d\u4e00\u81f4\u7684\u72b6\u6001\uff0c\u4e0e\u539f\u5b50\u6027\u6709\u76f8\u540c\u7684\u8bed\u4e49\u3002
\n\t\t\u53ef\u89c1\u3002synchronized\u4fdd\u8bc1\u8fdb\u5165\u540c\u6b65\u4ee3\u7801\u5757\u7684\u7ebf\u7a0b\uff0c\u90fd\u53ef\u4ee5\u770b\u5230\u7531\u540c\u4e00\u4e2a\u9501\u4fdd\u62a4\u7684\u4e4b\u524d\u6240\u6709\u7684\u4fee\u6539\u6548\u679c\u3002\u539f\u56e0\u662f\uff1a\u5728\u91ca\u653e\u76d1\u89c6\u5668\u65f6\uff08\u5373\u9000\u51fa\u540c\u6b65\u4ee3\u7801\u5757\uff09\uff0c\u4f1a\u5c06\u5de5\u4f5c\u5185\u5b58\u4e2d\u672a\u6620\u5c04\u5230\u4e3b\u5185\u5b58\u7684\u5de5\u4f5c\u62f7\u8d1d\uff0c\u5f3a\u5236\u5237\u65b0\u56de\u4e3b\u5185\u5bb9\u3002\u5728\u83b7\u53d6\u76d1\u89c6\u5668\u662f\uff08\u5373\u8fdb\u5165\u540c\u6b65\u4ee3\u7801\u5757\u65f6\uff09\uff0c\u76d1\u89c6\u5668\u4f1a\u4f7f\u672c\u5730\u5185\u5b58\u5931\u6548\uff0c\u5f3a\u5236\u4ece\u4e3b\u5185\u5b58\u62f7\u8d1d\u5230\u5de5\u4f5c\u5185\u5b58\u3002\n\t<\/p>\n<\/blockquote>\n

\n\t\u4e92\u65a5\u4fdd\u8bc1\u5728\u7ebf\u7a0b\u9000\u51fa\u524d\uff0c\u6240\u6709\u5bf9\u8c61\u72b6\u6001\u53d8\u66f4\u90fd\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u53ef\u89c1\uff1b\u53ef\u89c1\u4fdd\u8bc1\u5728\u7ebf\u7a0b\u8fdb\u5165\u540c\u6b65\u4ee3\u7801\u5757\u65f6\uff0c\u53ef\u4ee5\u770b\u5230\u4e0a\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u5bf9\u8c61\u72b6\u6001\u53d8\u66f4\u7684\u6700\u7ec8\u72b6\u6001\u3002\n<\/p>\n

\n\t\u7ebf\u7a0b\u5b89\u5168\u4e0e\u540c\u6b65
\n<\/h2>\n

\n\t\u7ebf\u7a0b\u5b89\u5168\u8868\u660e\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u4e0d\u4f1a\u6709\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u6570\u636e\u3002
\n\t\u7ebf\u7a0b\u540c\u6b65\u662f\u7ebf\u7a0b\u8bbf\u95ee\u7c7b\u548c\u5b9e\u4f8b\u5b57\u6bb5\u53d8\u91cf\uff0c\u548c\u5176\u4ed6\u5171\u4eab\u8d44\u6e90\u7684\u4e00\u79cd\u4e32\u884c\u5316\u884c\u4e3a\uff0c\u786e\u4fdd\u5728\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u8d44\u6e90\u3002\u4e3e\u4e2a\u6817\u5b50\uff0c\u6625\u8fd0\u706b\u8f66\u7968\u53ea\u5269\u4e0b\u6700\u540e\u4e00\u5f20\u706b\u8f66\u7968\uff0cA\uff0cB\u90fd\u8981\u62a2\u8fd9\u5f20\u706b\u8f66\u7968\uff0c\u600e\u4e48\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u9632\u6b62\u8d85\u5356\u5462\uff1f\u628a\u8d44\u6e90\u4fdd\u62a4\u8d77\u6765\uff0c\u8ba9A\uff0cB\u6392\u961f\u6765\u4e70\u706b\u8f66\u7968\u3002
\n\t\u7ebf\u7a0b\u5b89\u5168\u662f\u5c5e\u6027\uff0c\u7ebf\u7a0b\u540c\u6b65\u662f\u65b9\u5f0f\u3002\n<\/p>\n

\n\tmonitorenter \u548c monitorexit \u6307\u4ee4
\n<\/h2>\n

\n\tsynchronized\u540c\u6b65\u4ee3\u7801\u5757\u662f\u901a\u8fc7monitorenter\u548cmonitorexit\u6307\u4ee4\u5b9e\u73b0\u7684\uff0c\u800csynchronized\u540c\u6b65\u65b9\u6cd5\u662f\u57fa\u4e8eACC_SYCHRONIZED\u6807\u5fd7\uff0c\u540c\u6b65\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6JVM\u4f1a\u68c0\u67e5\u8fd9\u4e2a\u6807\u5fd7\u3002monitorenter\u6807\u8bb0\u4e34\u754c\u533a\u7684\u5f00\u59cb\uff0c\u7ebf\u7a0b\u6267\u884c\u5230 monitorenter \u6307\u4ee4\u65f6\uff0c\u5c06\u4f1a\u5c1d\u8bd5\u83b7\u53d6\u5bf9\u8c61\u6240\u5bf9\u5e94\u7684 monitor \u7684\u6240\u6709\u6743\uff1bmonitorexit\u6807\u8bb0\u4e34\u754c\u533a\u7684\u7ed3\u675f\uff0c\u7ebf\u7a0b\u6267\u884c\u5230 monitorexit \u6307\u4ee4\u65f6\uff0c\u5c06\u91ca\u653e\u5bf9\u8c61\u6240\u5bf9\u5e94\u7684 monitor \u7684\u6240\u6709\u6743\u3002\n<\/p>\n

\r\npublic class SynchronizedMethod {\r\n    public synchronized void methodA() {\r\n        System.out.println("www.xttblog.com");\r\n    }\r\n}<\/pre>\n
\n\t\u5c06\u8fd9\u6bb5\u4ee3\u7801\u901a\u8fc7 javap -c \u53cd\u7f16\u8bd1\u4e00\u4e0b\uff0c\u91cd\u70b9\u5173\u6ce8\u4e00\u4e0b\u7f16\u8bd1\u540e\u7684\u7b2c3\u884c\u548c\u7b2c13\u884c\u3002\n<\/p>\n
\r\nCompiled from "SynchronizedTest.java"\r\npublic class com.memory.SynchronizedTest {\r\n  public com.memory.SynchronizedTest();\r\n    Code:\r\n       0: aload_0       \r\n       1: invokespecial #1                  \/\/ Method java\/lang\/Object."<init>":()V\r\n       4: return        \r\n\r\n  public void methodA();\r\n    Code:\r\n       0: aload_0       \r\n       1: dup           \r\n       2: astore_1      \r\n       3: monitorenter  \r\n       4: getstatic     #2                  \/\/ Field java\/lang\/System.out:Ljava\/io\/PrintStream;\r\n       7: ldc           #3                  \/\/ String MethodA start\r\n       9: invokevirtual #4                  \/\/ Method java\/io\/PrintStream.println:(Ljava\/lang\/String;)V\r\n      12: aload_1       \r\n      13: monitorexit   \r\n      14: goto          22\r\n      17: astore_2      \r\n      18: aload_1       \r\n      19: monitorexit   \r\n      20: aload_2       \r\n      21: athrow        \r\n      22: return        \r\n    Exception table:\r\n       from    to  target type\r\n           4    14    17   any\r\n          17    20    17   any\r\n}<\/pre>\n
\n\t\u9501\u7684\u79cd\u7c7b
\n<\/h2>\n
\n\t\"java\n<\/p>\n
\n\tjava synchronized \u9501\u5347\u7ea7
\n<\/h2>\n
\n\tJDK1.6\u4e2d\u5bf9synchronized\u4f18\u5316\u5f15\u5165\u4e86\u504f\u5411\u9501\uff0c\u8f7b\u91cf\u7ea7\u9501\uff0c\u91cd\u91cf\u7ea7\u9501\u3002\u9501\u7684\u5347\u7ea7\u8fc7\u7a0b\u662f\u5355\u65b9\u5411\u7684\uff0c\u53ea\u5141\u8bb8\u4ece\u4f4e\u5230\u9ad8\u5347\u7ea7\uff0c\u4e0d\u5141\u8bb8\u964d\u7ea7\u3002\n<\/p>\n
\n\t\u91cd\u91cf\u7ea7\u9501\uff08Heavyweight Lock\uff09\u662f\u5c06\u7a0b\u5e8f\u8fd0\u884c\u4ea4\u51fa\u63a7\u5236\u6743\uff0c\u5c06\u7ebf\u7a0b\u6302\u8d77\uff0c\u7531\u64cd\u4f5c\u7cfb\u7edf\u6765\u8d1f\u8d23\u7ebf\u7a0b\u95f4\u7684\u8c03\u5ea6\uff0c\u8d1f\u8d23\u7ebf\u7a0b\u7684\u963b\u585e\u548c\u6267\u884c\u3002\u8fd9\u6837\u4f1a\u51fa\u73b0\u9891\u7e41\u5730\u5bf9\u7ebf\u7a0b\u8fd0\u884c\u72b6\u6001\u7684\u5207\u6362\uff0c\u7ebf\u7a0b\u7684\u6302\u8d77\u548c\u5524\u9192\uff0c\u6d88\u8017\u5927\u91cf\u7684\u7cfb\u7edf\u8d44\u6e90\uff0c\u5bfc\u81f4\u6027\u80fd\u4f4e\u4e0b\u3002\n<\/p>\n
\n\t\u8f7b\u91cf\u7ea7\u9501\uff08lightweight Locking\uff09\u662f\u76f8\u5bf9\u4e8e\u91cd\u91cf\u7ea7\u9501\u800c\u8a00\u7684\uff0c\u5728synchronized\u5b9e\u73b0\u4e2d\u4f7f\u7528\u81ea\u65cb\u7684\u65b9\u5f0f\uff0c\u5b9e\u9645\u662f\u901a\u8fc7CPU\u81ea\u65cb\u7b49\u5f85\u7684\u65b9\u5f0f\u66ff\u4ee3\u7ebf\u7a0b\u5207\u6362\uff0c\u7ade\u4e89\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u56e0\u6b64\u800c\u963b\u585e\uff0c\u907f\u514d\u963b\u585e\u5524\u9192\u9020\u6210\u7684CPU\u8d1f\u8377\u3002\u91c7\u7528\u81ea\u65cb\u7684\u65b9\u5f0f\u6709\u5229\u6709\u5f0a\uff0c\u5f53\u9501\u5360\u7528\u7684\u65f6\u95f4\u8f83\u77ed\u65f6\uff0c\u8f83\u5c11\u6b21\u6570\u7684\u81ea\u65cb\u7b49\u5f85\u5c31\u53ef\u4ee5\u83b7\u53d6\u9501\uff1b\u4f46\u5728\u9501\u5360\u7528\u7684\u65f6\u95f4\u8f83\u957f\u65f6\uff0c\u81ea\u65cb\u4f1a\u767d\u767d\u6d6a\u8d39\u5927\u91cf\u7684CPU\u8d44\u6e90\u3002\u56e0\u6b64\u81ea\u65cb\u7684\u6b21\u6570\u6709\u4e00\u5b9a\u8981\u5728\u9650\u5b9a\u4e4b\u5185\uff0c\u81ea\u65cb\u5931\u8d25\u5c31\u4f1a\u7acb\u5373\u5c06\u9501\u5347\u7ea7\u4e3a\u91cd\u91cf\u7ea7\u9501\uff0c\u79f0\u4e3a\u9501\u81a8\u80c0\u3002\n<\/p>\n
\n\t\u504f\u5411\u9501\uff08Biased Locking \uff09\u4ece\u5b57\u9762\u542b\u4e49\u662f\u8fd9\u628a\u9501\u662f\u6709\u79c1\u5fc3\u7684\uff0c\u4f1a\u503e\u5411\u4e8e\u4e0a\u6b21\u8bbf\u95ee\u7684\u7ebf\u7a0b\u3002Hotspot\u7684\u4f5c\u8005\u5728\u4ed6\u7684\u8bba\u6587\u300aQRL-OpLocks-BiasedLocking\u300b\u4e2d\u9610\u8ff0\u5230\uff0c\u7814\u7a76\u53d1\u73b0\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u4e0d\u5b58\u5728\u591a\u7ebf\u7a0b\u4e89\u593a\u5171\u4eab\u8d44\u6e90\uff0c\u800c\u4e14\u603b\u662f\u7531\u540c\u4e00\u7ebf\u7a0b\u591a\u6b21\u83b7\u5f97\uff0c\u8003\u8651\u5230CAS \uff08Compare-And-Swap\uff09\u6307\u4ee4\u5728\u83b7\u53d6Java\u76d1\u89c6\u5668\u65f6\u4f1a\u9020\u6210\u8f83\u5927\u7684CPU\u5ef6\u8fdf\uff0c\u4e3a\u4e86\u8ba9\u7ebf\u7a0b\u83b7\u5f97\u9501\u7684\u4ee3\u4ef7\u66f4\u4f4e\u800c\u5f15\u5165\u4e86\u504f\u5411\u9501\u3002\n<\/p>\n
\n\t\u9501\u6807\u8bb0\u7684\u4f4d\u7f6e
\n<\/h2>\n
\n\t64\u4f4d\u865a\u62df\u673a\u4e2d\uff0c\u6807\u8bb0\u5b57\u6bb5\uff08Mark Word\uff09\u4e2d\u5305\u542b\u54c8\u5e0c\u5417\uff08HashCode\uff0c\u5b58\u653e31bits\u5bf9\u8c61\u7684hashcode\u503c\uff09\uff0cGC\u5206\u4ee3\u5e74\u9f84\uff08Generational GC Age\uff0c4bits\uff0c\u56e0\u6b64\u5206\u4ee3\u5e74\u9f84\u6700\u9ad8\u4e3a15\uff09\uff0c\u504f\u5411\u7ebf\u7a0bID\uff0c\u504f\u5411\u9501\u6807\u8bb0\u3002
\n\tsynchronized\u9501\u7684\u56db\u4e2a\u72b6\u6001\uff1a\u65e0\u9501\u72b6\u6001\uff0c\u504f\u5411\u9501\uff0c\u8f7b\u91cf\u7ea7\u9501\u548c\u91cd\u91cf\u7ea7\u9501\uff0c\u5728Mark Word\u4e2d\u5bf9\u5e94\u4e0d\u540c\u7684\u5b57\u6bb5\u3002\n<\/p>\n
\n\t\"synchronized\u9501\u7684\u56db\u4e2a\u72b6\u6001\uff1a\u65e0\u9501\u72b6\u6001\uff0c\u504f\u5411\u9501\uff0c\u8f7b\u91cf\u7ea7\u9501\u548c\u91cd\u91cf\u7ea7\u9501\"\n<\/p>\n
\n\tjava synchronized\u4e0d\u540c\u7ea7\u522b\u9501\u4e2d\u7684Mark Word\n<\/p>\n
\n\t\u53c2\u8003\u8d44\u6599
\n<\/h2>\n
\n\tJSR 133 (Java Memory Model) FAQ<\/a>
\n\tJava\u5185\u5b58\u6a21\u578b(\u4e00)<\/a>
\n\tJava \u9501\u673a\u673a\u5236——\u6d45\u6790 Synchronized<\/a>
\n\tBiased Locking in HotSpot<\/a>
\n\tJava Synchronised\u673a\u5236<\/a>
\n\t\u6df1\u5165JVM\u9501\u673a\u52361-synchronized<\/a>
\n\t\u591a\u7ebf\u7a0b\u4e4b\uff1a\u504f\u5411\u9501\uff0c\u8f7b\u91cf\u7ea7\u9501\uff0c\u91cd\u91cf\u7ea7\u9501<\/a>
\n\tJVM\u5185\u90e8\u7ec6\u8282\u4e4b\u4e00\uff1asynchronized\u5173\u952e\u5b57\u53ca\u5b9e\u73b0\u7ec6\u8282\uff08\u8f7b\u91cf\u7ea7\u9501Lightweight Locking\uff09<\/a>
\n\tjava\u9501\u4f18\u5316<\/a>
\n\tJava\u5e76\u53d1\u7f16\u7a0b\uff1aSynchronized\u5e95\u5c42\u4f18\u5316\uff08\u504f\u5411\u9501\u3001\u8f7b\u91cf\u7ea7\u9501\uff09<\/a>
\n\t\u865a\u62df\u673a\u4e2d\u7684\u9501\u4f18\u5316\u7b80\u4ecb\uff08\u9002\u5e94\u6027\u81ea\u65cb\/\u9501\u7c97\u5316\/\u9501\u524a\u9664\/\u8f7b\u91cf\u7ea7\u9501\/\u504f\u5411\u9501\uff09<\/a>
\n\tJVM\u5185\u90e8\u7ec6\u8282\u4e4b\u4e8c\uff1a\u504f\u5411\u9501\uff08Biased Locking\uff09<\/a>
\n\t\u5c0f\u8bae\u504f\u5411\u9501<\/a>
\n\tsynchronized\u3001\u9501\u3001\u591a\u7ebf\u7a0b\u540c\u6b65\u7684\u539f\u7406\u662f\u548b\u6837\u7684<\/a>
\n\tJava\u4e2d\u7684\u9501<\/a>
\n\tmarkOop.hpp<\/a>
\n\t5 Things You Didn’t Know About Synchronization in Java and Scala<\/a><\/p>\n
\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/<\/p>
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\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » java \u7ebf\u7a0b\u540c\u6b65 synchronized \u8be6\u89e3<\/a><\/p>","protected":false},"excerpt":{"rendered":"
synchronized\u65e2\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u53c8\u4fdd\u8bc1\u5185\u5b58\u53ef\u89c1\u6027\uff0c\u662f\u4e00\u79cd\u7ebf\u7a0b\u540c\u6b65\u7684\u65b9\u5f0f\uff0c\u662f\u9501\u673a\u5236\u7684\u4e00\u79cdjava\u5b9e\u73b0\u3002sy […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[69,730,426,531,729],"class_list":["post-1018","post","type-post","status-publish","format-standard","hentry","category-java","tag-java","tag-monitorenter","tag-synchronized","tag-531","tag-729"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1018"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1018\/revisions"}],"predecessor-version":[{"id":1019,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/1018\/revisions\/1019"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}