{"id":852,"date":"2023-12-15T10:24:15","date_gmt":"2023-09-14T04:38:32","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e9%94%81%e7%a4%ba%e4%be%8b-reentrantlock\/"},"modified":"2025-08-03T12:50:34","modified_gmt":"2025-08-03T04:50:34","slug":"java%e9%94%81%e7%a4%ba%e4%be%8b-reentrantlock","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e9%94%81%e7%a4%ba%e4%be%8b-reentrantlock\/","title":{"rendered":"Java ReentrantLock\u9501\u673a\u5236\u8be6\u89e3\uff1a\u5b9e\u4f8b\u6559\u7a0b\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

Java\u9501\u793a\u4f8b – ReentrantLock<\/h1>\n

\u6b22\u8fce\u6765\u5230Java\u9501\u793a\u4f8b\u6559\u7a0b\u3002\u901a\u5e38\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528synchronized\u5173\u952e\u5b57\u3002<\/p>\n

Java \u9501<\/h2>\n

\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0csynchronized\u5173\u952e\u5b57\u662f\u9996\u9009\u7684\u65b9\u6cd5\uff0c\u4f46\u5b83\u5b58\u5728\u4e00\u4e9b\u7f3a\u70b9\uff0c\u8fd9\u5bfc\u81f4\u4e86\u5728Java\u5e76\u53d1\u5305\u4e2d\u5305\u542bLock API\u3002Java 1.5\u5e76\u53d1API\u5f15\u5165\u4e86java.util.concurrent.locks\u5305\uff0c\u5176\u4e2d\u5305\u62ecLock\u63a5\u53e3\u548c\u4e00\u4e9b\u5b9e\u73b0\u7c7b\uff0c\u4ee5\u6539\u5584\u5bf9\u8c61\u9501\u5b9a\u673a\u5236\u3002Java Lock API\u4e2d\u7684\u4e00\u4e9b\u91cd\u8981\u63a5\u53e3\u548c\u7c7b\u6709\uff1a<\/p>\n

\u9501\uff08Lock\uff09<\/h3>\n

\u8fd9\u662f\u9501API\u7684\u57fa\u672c\u63a5\u53e3\u3002\u5b83\u63d0\u4f9b\u4e86\u4e0e\u5173\u952e\u5b57synchronized\u76f8\u540c\u7684\u6240\u6709\u7279\u6027\uff0c\u5e76\u63d0\u4f9b\u4e86\u521b\u5efa\u4e0d\u540c\u6761\u4ef6\u8fdb\u884c\u9501\u5b9a\u7684\u9644\u52a0\u65b9\u6cd5\uff0c\u4e3a\u7ebf\u7a0b\u63d0\u4f9b\u4e86\u7b49\u5f85\u9501\u7684\u8d85\u65f6\u65f6\u95f4\u3002\u5176\u4e2d\u4e00\u4e9b\u91cd\u8981\u7684\u65b9\u6cd5\u6709lock()\u6765\u83b7\u53d6\u9501\uff0cunlock()\u6765\u91ca\u653e\u9501\uff0ctryLock()\u6765\u7b49\u5f85\u4e00\u5b9a\u65f6\u95f4\u83b7\u53d6\u9501\uff0cnewCondition()\u7528\u4e8e\u521b\u5efa\u6761\u4ef6\u7b49\u3002<\/p>\n

\u6761\u4ef6\uff08Condition\uff09<\/h3>\n

\u6761\u4ef6\u5bf9\u8c61\u7c7b\u4f3c\u4e8e\u5bf9\u8c61\u7b49\u5f85-\u901a\u77e5\u6a21\u578b\uff0c\u5177\u6709\u521b\u5efa\u4e0d\u540c\u7b49\u5f85\u96c6\u7684\u9644\u52a0\u529f\u80fd\u3002\u6761\u4ef6\u5bf9\u8c61\u59cb\u7ec8\u7531\u9501\u5bf9\u8c61\u521b\u5efa\u3002\u5176\u4e2d\u4e00\u4e9b\u91cd\u8981\u7684\u65b9\u6cd5\u6709await()\uff0c\u4e0ewait()\u7c7b\u4f3c\uff0csignal()\u548csignalAll()\uff0c\u4e0enotify()\u548cnotifyAll()\u65b9\u6cd5\u7c7b\u4f3c\u3002<\/p>\n

\u8bfb\u5199\u9501\uff08ReadWriteLock\uff09<\/h3>\n

\u5b83\u5305\u542b\u4e00\u5bf9\u5173\u8054\u9501\uff0c\u4e00\u4e2a\u7528\u4e8e\u53ea\u8bfb\u64cd\u4f5c\uff0c\u53e6\u4e00\u4e2a\u7528\u4e8e\u5199\u64cd\u4f5c\u3002\u53ea\u8981\u6ca1\u6709\u5199\u7ebf\u7a0b\uff0c\u53ea\u8bfb\u9501\u53ef\u4ee5\u540c\u65f6\u7531\u591a\u4e2a\u8bfb\u7ebf\u7a0b\u6301\u6709\u3002\u5199\u9501\u662f\u72ec\u5360\u7684\u3002<\/p>\n

\u53ef\u91cd\u5165\u9501\uff08ReentrantLock\uff09<\/h3>\n

\u8fd9\u662f\u6700\u5e38\u7528\u7684Lock\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u3002\u8be5\u7c7b\u4ee5\u4e0esynchronized\u5173\u952e\u5b57\u7c7b\u4f3c\u7684\u65b9\u5f0f\u5b9e\u73b0Lock\u63a5\u53e3\u3002\u9664\u4e86Lock\u63a5\u53e3\u7684\u5b9e\u73b0\uff0c\u53ef\u91cd\u5165\u9501\u8fd8\u5305\u542b\u4e00\u4e9b\u5b9e\u7528\u65b9\u6cd5\uff0c\u7528\u4e8e\u83b7\u53d6\u6301\u6709\u9501\u7684\u7ebf\u7a0b\u4ee5\u53ca\u7b49\u5f85\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\u7b49\u3002\u540c\u6b65\u5757\u5728\u672c\u8d28\u4e0a\u662f\u53ef\u91cd\u5165\u7684\uff0c\u5373\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u76d1\u89c6\u5668\u5bf9\u8c61\u6301\u6709\u9501\uff0c\u5e76\u4e14\u5982\u679c\u53e6\u4e00\u4e2a\u540c\u6b65\u5757\u9700\u8981\u5bf9\u540c\u4e00\u76d1\u89c6\u5668\u5bf9\u8c61\u6301\u6709\u9501\uff0c\u5219\u7ebf\u7a0b\u53ef\u4ee5\u8fdb\u5165\u8be5\u4ee3\u7801\u5757\u3002\u6211\u8ba4\u4e3a\u8fd9\u662f\u7c7b\u540d\u4e3aReentrantLock\u7684\u539f\u56e0\u3002\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\u6765\u7406\u89e3\u8fd9\u4e2a\u7279\u6027\u3002<\/p>\n

\u5982\u679c\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165foo()\u65b9\u6cd5\uff0c\u5b83\u5c06\u9501\u5b9aTest\u5bf9\u8c61\uff0c\u56e0\u6b64\u5f53\u5b83\u5c1d\u8bd5\u6267\u884cbar()\u65b9\u6cd5\u65f6\uff0c\u5141\u8bb8\u8be5\u7ebf\u7a0b\u6267\u884cbar()\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u5df2\u7ecf\u6301\u6709Test\u5bf9\u8c61\u7684\u9501\uff0c\u5373\u4e0esynchronized(this)\u76f8\u540c\u3002<\/p>\n

Java\u9501\u793a\u4f8b – Java\u4e2d\u7684\u53ef\u91cd\u5165\u9501<\/h3>\n

\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u6211\u4eec\u5c06\u4f7f\u7528Java Lock API\u6765\u66ff\u6362synchronized\u5173\u952e\u5b57\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2aResource\u7c7b\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e9b\u9700\u8981\u7ebf\u7a0b\u5b89\u5168\u7684\u64cd\u4f5c\uff0c\u540c\u65f6\u4e5f\u6709\u4e00\u4e9b\u4e0d\u9700\u8981\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\u3002<\/p>\n

package com.Olivia.threads.lock;\r\n\r\npublic class Resource {\r\n\r\n\tpublic void doSomething(){\r\n\t\t\/\/ \u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\uff0c\u6570\u636e\u5e93\u8bfb\u5199\u7b49\r\n\t}\r\n\t\r\n\tpublic void doLogging(){\r\n\t\t\/\/ \u65e5\u5fd7\u8bb0\u5f55\uff0c\u4e0d\u9700\u8981\u7ebf\u7a0b\u5b89\u5168\r\n\t}\r\n}\r\n<\/code><\/pre>\n
\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5b9e\u73b0Runnable\u63a5\u53e3\u7684\u7c7b\uff0c\u6211\u4eec\u5c06\u5728\u8fd9\u4e2a\u7c7b\u4e2d\u4f7f\u7528\u8d44\u6e90\u65b9\u6cd5\u3002<\/p>\n
package com.Olivia.threads.lock;\r\n\r\npublic class SynchronizedLockExample implements Runnable{\r\n\r\n\tprivate Resource resource;\r\n\t\r\n\tpublic SynchronizedLockExample(Resource r){\r\n\t\tthis.resource = r;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic void run() {\r\n\t\tsynchronized (resource) {\r\n\t\t\tresource.doSomething();\r\n\t\t}\r\n\t\tresource.doLogging();\r\n\t}\r\n}\r\n<\/code><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u6211\u5728\u4f7f\u7528\u540c\u6b65\u5757\u6765\u83b7\u53d6 Resource \u5bf9\u8c61\u4e0a\u7684\u9501\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u7c7b\u4e2d\u521b\u5efa\u4e00\u4e2a\u865a\u62df\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u7528\u4e8e\u9501\u5b9a\u76ee\u7684\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u4f7f\u7528 Java Lock API \u5e76\u91cd\u65b0\u7f16\u5199\u4e0a\u8ff0\u7a0b\u5e8f\uff0c\u800c\u4e0d\u4f7f\u7528 synchronized \u5173\u952e\u5b57\u3002\u6211\u4eec\u5c06\u5728 Java \u4e2d\u4f7f\u7528 ReentrantLock\u3002<\/p>\n
package com.Olivia.threads.lock;\r\n\r\nimport java.util.concurrent.TimeUnit;\r\nimport java.util.concurrent.locks.Lock;\r\nimport java.util.concurrent.locks.ReentrantLock;\r\n\r\npublic class ConcurrencyLockExample implements Runnable{\r\n\r\n\tprivate Resource resource;\r\n\tprivate Lock lock;\r\n\t\r\n\tpublic ConcurrencyLockExample(Resource r){\r\n\t\tthis.resource = r;\r\n\t\tthis.lock = new ReentrantLock();\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic void run() {\r\n\t\ttry {\r\n\t\t\tif(lock.tryLock(10, TimeUnit.SECONDS)){\r\n\t\t\t\tresource.doSomething();\r\n\t\t\t}\r\n\t\t} catch (InterruptedException e) {\r\n\t\t\te.printStackTrace();\r\n\t\t}finally{\r\n\t\t\t\/\/ \u91ca\u653e\u9501\r\n\t\t\tlock.unlock();\r\n\t\t}\r\n\t\tresource.doLogging();\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
\u6b63\u5982\u4f60\u6240\u89c1\uff0c\u6211\u6b63\u5728\u4f7f\u7528tryLock()\u65b9\u6cd5\u786e\u4fdd\u6211\u7684\u7ebf\u7a0b\u53ea\u7b49\u5f85\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u5982\u679c\u4e0d\u80fd\u83b7\u53d6\u5bf9\u8c61\u4e0a\u7684\u9501\uff0c\u53ea\u662f\u8bb0\u5f55\u5e76\u9000\u51fa\u3002\u53e6\u4e00\u4e2a\u91cd\u8981\u7684\u70b9\u8981\u6ce8\u610f\u7684\u662f\u4f7f\u7528try-finally\u4ee3\u7801\u5757\u6765\u786e\u4fdd\u5373\u4f7fdoSomething()\u65b9\u6cd5\u8c03\u7528\u629b\u51fa\u5f02\u5e38\uff0c\u9501\u4e5f\u4f1a\u88ab\u91ca\u653e\u3002<\/p>\n
Java\u4e2d\u7684\u9501\u673a\u5236\u4e0esynchronized\u7684\u5bf9\u6bd4<\/h3>\n
\u6839\u636e\u4e0a\u8ff0\u7ec6\u8282\u548c\u7a0b\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5f97\u51faJava Lock\u548c\u540c\u6b65\u4e4b\u95f4\u7684\u4ee5\u4e0b\u533a\u522b\u3002<\/p>\n
    \n
  • Java\u7684\u9501API\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u53ef\u89c1\u6027\u548c\u9501\u5b9a\u9009\u9879\uff0c\u4e0d\u540c\u4e8esynchronized\u5173\u952e\u5b57\uff0c\u7ebf\u7a0b\u6709\u53ef\u80fd\u65e0\u9650\u671f\u5730\u7b49\u5f85\u9501\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528tryLock()\u65b9\u6cd5\u6765\u786e\u4fdd\u7ebf\u7a0b\u53ea\u7b49\u5f85\u7279\u5b9a\u7684\u65f6\u95f4\u3002<\/li>\n
  • \u540c\u6b65\u4ee3\u7801\u66f4\u6e05\u6d01\u6613\u4e8e\u7ef4\u62a4\uff0c\u800c\u4f7f\u7528\u9501\u7684\u8bdd\uff0c\u6211\u4eec\u88ab\u8feb\u4f7f\u7528try-finally\u5757\u6765\u786e\u4fdd\u65e0\u8bba\u5728lock()\u548cunlock()\u65b9\u6cd5\u8c03\u7528\u4e4b\u95f4\u662f\u5426\u629b\u51fa\u4e86\u5f02\u5e38\uff0c\u9501\u90fd\u88ab\u91ca\u653e\u3002<\/li>\n
  • \u540c\u6b65\u5757\u6216\u65b9\u6cd5\u53ea\u80fd\u8986\u76d6\u4e00\u4e2a\u65b9\u6cd5\uff0c\u800c\u4f7f\u7528\u9501API\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u4e2a\u65b9\u6cd5\u4e2d\u83b7\u53d6\u9501\uff0c\u5728\u53e6\u4e00\u4e2a\u65b9\u6cd5\u4e2d\u91ca\u653e\u9501\u3002<\/li>\n
  • synchronized\u5173\u952e\u5b57\u4e0d\u63d0\u4f9b\u516c\u5e73\u6027\uff0c\u800c\u6211\u4eec\u53ef\u4ee5\u5728\u521b\u5efaReentrantLock\u5bf9\u8c61\u65f6\u5c06\u516c\u5e73\u6027\u8bbe\u7f6e\u4e3atrue\uff0c\u8fd9\u6837\u7b49\u5f85\u65f6\u95f4\u6700\u957f\u7684\u7ebf\u7a0b\u4f1a\u9996\u5148\u83b7\u53d6\u9501\u3002<\/li>\n
  • \u6211\u4eec\u53ef\u4ee5\u4e3a\u9501\u521b\u5efa\u4e0d\u540c\u7684\u6761\u4ef6\uff0c\u5e76\u4e14\u4e0d\u540c\u7684\u7ebf\u7a0b\u53ef\u4ee5\u7b49\u5f85\u4e0d\u540c\u7684\u6761\u4ef6\u3002<\/li>\n<\/ul>\n
    \u5173\u4e8eJava\u9501\u793a\u4f8b\uff0cJava\u4e2d\u7684ReentrantLock\u4ee5\u53ca\u4e0esynchronized\u5173\u952e\u5b57\u7684\u6bd4\u8f83\u5206\u6790\u5c31\u8fd9\u4e9b\u5185\u5bb9\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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