{"id":748,"date":"2021-02-10T22:51:35","date_gmt":"2021-02-10T14:51:35","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=748"},"modified":"2021-02-10T22:52:47","modified_gmt":"2021-02-10T14:52:47","slug":"lock-%e9%94%81","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-748.html","title":{"rendered":"Lock \u9501"},"content":{"rendered":"\n

\u5bf9\u4e8e\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u7684\u53e6\u4e00\u79cd\u65b9\u5f0f\uff0c\u662f Lock \u9501<\/p>\n\n\n\n

Lock \u9501\u6bd4 synchronized \u6027\u80fd\u66f4\u597d\uff0c\u53ef\u4ee5\u907f\u514d\u5176\u4ed6\u7ebf\u7a0b\u4e0d\u65ad\u68c0\u6d4b\u9501\u5bf9\u8c61<\/p>\n\n\n\n

1.\u5bfc\u5305<\/h5>\n\n\n\n

Lock \u662f\u4e00\u4e2a\u63a5\u53e3\u7c7b\uff0c\u65e0\u6cd5\u76f4\u63a5\u521b\u5efa\uff0c\u5bfc\u5165\u5b83\u548c\u5b83\u7684\u5b50\u7c7b\u5b9e\u73b0\u7c7b<\/p>\n\n\n\n

import java.util.Lock;\njava.util.concurrent.locks.ReentrantLock;<\/code><\/pre>\n\n\n\n
2.\u6784\u9020\u65b9\u6cd5<\/h5>\n\n\n\n
\u4f7f\u7528\u591a\u6001\u7684\u65b9\u5f0f\u6784\u9020<\/p>\n\n\n\n
Lock l = new ReentrantLock();<\/code><\/pre>\n\n\n\n
3.\u65b9\u6cd5<\/h5>\n\n\n\n
1.\u4e0a\u9501<\/p>\n\n\n\n
l.lock();<\/code><\/pre>\n\n\n\n
2.\u89e3\u9501<\/p>\n\n\n\n
l.unlock();<\/code><\/pre>\n\n\n\n
4.\u4f8b\u5b50<\/h5>\n\n\n\n
\u914d\u5408 try — catch — finally \uff0c\u53ef\u4ee5\u5f88\u597d\u7684\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/p>\n\n\n\n
\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u540d\u79f0 RunnableImpl \uff0c\u62f7\u8d1d\u5982\u4e0b\u4ee3\u7801\u5373\u53ef<\/p>\n\n\n\n
import java.util.concurrent.locks.Lock;\nimport java.util.concurrent.locks.ReentrantLock;\n\n\/*\n    \u5356\u7968\u6848\u4f8b\u51fa\u73b0\u4e86\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\n    \u5356\u51fa\u4e86\u4e0d\u5b58\u5728\u7684\u7968\u548c\u91cd\u590d\u7684\u7968\n\n    \u4f7f\u7528\u6b65\u9aa4:\n        1.\u5728\u6210\u5458\u4f4d\u7f6e\u521b\u5efa\u4e00\u4e2aReentrantLock\u5bf9\u8c61\n        2.\u5728\u53ef\u80fd\u4f1a\u51fa\u73b0\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\u524d\u8c03\u7528Lock\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5lock\u83b7\u53d6\u9501\n        3.\u5728\u53ef\u80fd\u4f1a\u51fa\u73b0\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\u540e\u8c03\u7528Lock\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5unlock\u91ca\u653e\u9501\n *\/\npublic class RunnableImpl implements Runnable{\n    \/\/\u5b9a\u4e49\u4e00\u4e2a\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u7968\u6e90\n    private  int ticket = 100;\n\n    \/\/1.\u5728\u6210\u5458\u4f4d\u7f6e\u521b\u5efa\u4e00\u4e2aReentrantLock\u5bf9\u8c61\n    Lock l = new ReentrantLock();\n\n    \/\/\u8bbe\u7f6e\u7ebf\u7a0b\u4efb\u52a1:\u5356\u7968\n    @Override\n    public void run() {\n        \/\/\u4f7f\u7528\u6b7b\u5faa\u73af,\u8ba9\u5356\u7968\u64cd\u4f5c\u91cd\u590d\u6267\u884c\n        while(true){\n            \/\/2.\u5728\u53ef\u80fd\u4f1a\u51fa\u73b0\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\u524d\u8c03\u7528Lock\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5lock\u83b7\u53d6\u9501\n            l.lock();\n\n            \/\/\u5148\u5224\u65ad\u7968\u662f\u5426\u5b58\u5728\n            if(ticket>0){\n                \/\/\u63d0\u9ad8\u5b89\u5168\u95ee\u9898\u51fa\u73b0\u7684\u6982\u7387,\u8ba9\u7a0b\u5e8f\u7761\u7720\n                try {\n                    Thread.sleep(10);\n                    \/\/\u7968\u5b58\u5728,\u5356\u7968 ticket--\n                    System.out.println(Thread.currentThread().getName()+\"-->\u6b63\u5728\u5356\u7b2c\"+ticket+\"\u5f20\u7968\");\n                    ticket--;\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }finally {\n                    \/\/3.\u5728\u53ef\u80fd\u4f1a\u51fa\u73b0\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\u540e\u8c03\u7528Lock\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5unlock\u91ca\u653e\u9501\n                    l.unlock();\/\/\u65e0\u8bba\u7a0b\u5e8f\u662f\u5426\u5f02\u5e38,\u90fd\u4f1a\u628a\u9501\u91ca\u653e\n                }\n            }\n        }\n    }\n    public static void main(String[] args) {\n        \/\/\u521b\u5efaRunnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61\n        RunnableImpl run = new RunnableImpl();\n        \/\/\u521b\u5efaThread\u7c7b\u5bf9\u8c61,\u6784\u9020\u65b9\u6cd5\u4e2d\u4f20\u9012Runnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61\n        Thread t0 = new Thread(run);\n        Thread t1 = new Thread(run);\n        Thread t2 = new Thread(run);\n        \/\/\u8c03\u7528start\u65b9\u6cd5\u5f00\u542f\u591a\u7ebf\u7a0b\n        t0.start();\n        t1.start();\n        t2.start();\n    }\n}  <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5bf9\u4e8e\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u7684\u53e6\u4e00\u79cd\u65b9\u5f0f\uff0c\u662f Lock \u9501 Lock \u9501\u6bd4 synchronized \u6027\u80fd\u66f4\u597d\uff0c\u53ef\u4ee5\u907f\u514d\u5176… \u7ee7\u7eed\u9605\u8bfb Lock \u9501<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[25],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/748"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=748"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/748\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=748"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=748"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=748"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}