{"id":3048,"date":"2024-03-28T14:13:00","date_gmt":"2024-03-28T06:13:00","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=3048"},"modified":"2024-12-16T11:14:31","modified_gmt":"2024-12-16T03:14:31","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e7%b4%a2semaphore%e7%b1%bb%ef%bc%9a%e5%9c%a8%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e4%b8%ad%e5%85%b7%e4%bd%93%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=3048","title":{"rendered":"\u6df1\u5165\u63a2\u7d22 Java Semaphore \u7c7b\uff1a\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u5177\u4f53\u5e94\u7528"},"content":{"rendered":"\n<p>\u5728 Java \u5f00\u53d1\u9886\u57df\uff0c\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e00\u76f4\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8bdd\u9898\u3002\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u7684\u590d\u6742\u6027\u589e\u52a0\uff0c\u6b63\u786e\u5730\u7ba1\u7406\u591a\u7ebf\u7a0b\u53d8\u5f97\u5c24\u4e3a\u5173\u952e\u3002\u5728\u8fd9\u6837\u7684\u80cc\u666f\u4e0b\uff0cJava \u63d0\u4f9b\u4e86\u8bb8\u591a\u540c\u6b65\u673a\u5236\u6765\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u6709\u6548\u5730\u63a7\u5236\u5e76\u53d1\u8bbf\u95ee\u3002\u5176\u4e2d\u4e00\u4e2a\u5f3a\u5927\u7684\u5de5\u5177\u5c31\u662f <code>Semaphore<\/code> \u7c7b\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8 <code>Semaphore<\/code> \u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u901a\u8fc7\u5177\u4f53\u793a\u4f8b\u6765\u8bf4\u660e\u5176\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7684\u5e94\u7528\u573a\u666f\u53ca\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Semaphore \u7684\u6838\u5fc3\u529f\u80fd<\/h5>\n\n\n\n<p><code>Semaphore<\/code> \u662f Java.util.concurrent \u5305\u4e0b\u7684\u4e00\u4e2a\u7c7b\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u8ba1\u6570\u4fe1\u53f7\u91cf\u7684\u5b9e\u73b0\u3002\u7b80\u5355\u6765\u8bf4\uff0c<code>Semaphore<\/code> \u7ef4\u62a4\u4e86\u4e00\u7ec4\u8bb8\u53ef\u8bc1\uff0c\u7ebf\u7a0b\u5728\u8bbf\u95ee\u67d0\u4e9b\u8d44\u6e90\u524d\u5fc5\u987b\u5148\u83b7\u5f97\u8bb8\u53ef\u8bc1\uff0c\u5f53\u8bb8\u53ef\u8bc1\u7528\u5c3d\u65f6\uff0c\u5176\u4ed6\u7ebf\u7a0b\u5c31\u9700\u8981\u7b49\u5f85\uff0c\u76f4\u5230\u6709\u7ebf\u7a0b\u91ca\u653e\u8bb8\u53ef\u8bc1\u3002\u8fd9\u79cd\u673a\u5236\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\uff0c\u4ece\u800c\u907f\u514d\u7ade\u4e89\u6761\u4ef6\u548c\u6570\u636e\u4e0d\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u7c7b\u7ee7\u627f\u5173\u7cfb<\/h5>\n\n\n\n<p>\u5728 Java \u4e2d\uff0c<code>Semaphore<\/code> \u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-6ec404dcdabe572931c8f5179e90bed1\"><code>java.lang.Object\n  \u2514\u2500 java.util.concurrent.Semaphore<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u51fa\uff0c<code>Semaphore<\/code> \u7c7b\u76f4\u63a5\u7ee7\u627f\u81ea <code>Object<\/code> \u7c7b\uff0c\u56e0\u6b64\u5b83\u5177\u6709\u4e86 <code>Object<\/code> \u7c7b\u7684\u6240\u6709\u7279\u6027\uff0c\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\u5b9e\u73b0\u4e86\u4fe1\u53f7\u91cf\u7684\u529f\u80fd\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u5b9e\u73b0\u539f\u7406<\/h5>\n\n\n\n<p><code>Semaphore<\/code> \u7684\u5b9e\u73b0\u539f\u7406\u4e3b\u8981\u57fa\u4e8e\u4e00\u4e2a\u8ba1\u6570\u5668\u548c\u7b49\u5f85\u961f\u5217\u3002\u8ba1\u6570\u5668\u7528\u4e8e\u8bb0\u5f55\u5f53\u524d\u53ef\u7528\u7684\u8bb8\u53ef\u8bc1\u6570\u91cf\uff0c\u7b49\u5f85\u961f\u5217\u5219\u7528\u4e8e\u5b58\u653e\u9700\u8981\u83b7\u53d6\u8bb8\u53ef\u8bc1\u4f46\u5f53\u524d\u65e0\u6cd5\u83b7\u5f97\u7684\u7ebf\u7a0b\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8bf7\u6c42\u8bb8\u53ef\u8bc1\u65f6\uff0c\u5982\u679c\u8ba1\u6570\u5668\u5927\u4e8e 0\uff0c\u7ebf\u7a0b\u5c06\u83b7\u5f97\u8bb8\u53ef\u8bc1\u5e76\u5c06\u8ba1\u6570\u5668\u51cf\u4e00\uff1b\u5982\u679c\u8ba1\u6570\u5668\u4e3a 0\uff0c\u5219\u7ebf\u7a0b\u5c06\u8fdb\u5165\u7b49\u5f85\u961f\u5217\uff0c\u76f4\u5230\u6709\u5176\u4ed6\u7ebf\u7a0b\u91ca\u653e\u8bb8\u53ef\u8bc1\u3002\u5f53\u7ebf\u7a0b\u91ca\u653e\u8bb8\u53ef\u8bc1\u65f6\uff0c\u8ba1\u6570\u5668\u5c06\u589e\u52a0\uff0c\u5e76\u4e14\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u67d0\u4e2a\u7ebf\u7a0b\u5c06\u88ab\u5524\u9192\u4ee5\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u793a\u4f8b\u5e94\u7528\u573a\u666f<\/h5>\n\n\n\n<p>1.\u63a7\u5236\u5e76\u53d1\u7ebf\u7a0b\u6570\u91cf<\/p>\n\n\n\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5e0c\u671b\u9650\u5236\u540c\u65f6\u6267\u884c\u7684\u7ebf\u7a0b\u6570\u91cf\uff0c\u4ee5\u907f\u514d\u8d44\u6e90\u8fc7\u5ea6\u7ade\u4e89\u6216\u8005\u964d\u4f4e\u7cfb\u7edf\u8d1f\u8f7d\u3002<code>Semaphore<\/code> \u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5b9e\u73b0\u8fd9\u6837\u7684\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-2b1670d81fcfe1c1c9242540cebf510c\"><code>import java.util.concurrent.Semaphore;\n\npublic class ConcurrentTaskExecutor {\n    private static final int MAX_CONCURRENT_TASKS = 5;\n    private final Semaphore semaphore = new Semaphore(MAX_CONCURRENT_TASKS);\n\n    public void executeTask(Runnable task) throws InterruptedException {\n        semaphore.acquire();\n        try {\n            task.run();\n        } finally {\n            semaphore.release();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>ConcurrentTaskExecutor<\/code> \u7c7b\u901a\u8fc7 <code>Semaphore<\/code> \u6765\u63a7\u5236\u540c\u65f6\u6267\u884c\u7684\u4efb\u52a1\u6570\u91cf\uff0c\u6700\u591a\u5141\u8bb8 5 \u4e2a\u4efb\u52a1\u540c\u65f6\u6267\u884c\u3002\u5f53\u6709\u65b0\u4efb\u52a1\u5230\u6765\u65f6\uff0c\u9996\u5148\u5c1d\u8bd5\u83b7\u53d6\u8bb8\u53ef\u8bc1\uff0c\u5982\u679c\u8bb8\u53ef\u8bc1\u6570\u91cf\u4e0d\u8db3\uff0c\u5219\u7ebf\u7a0b\u5c06\u88ab\u963b\u585e\uff0c\u76f4\u5230\u6709\u8bb8\u53ef\u8bc1\u53ef\u7528\u3002\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\u91ca\u653e\u8bb8\u53ef\u8bc1\uff0c\u4ee5\u4fbf\u5176\u4ed6\u7b49\u5f85\u7684\u4efb\u52a1\u53ef\u4ee5\u6267\u884c\u3002<\/p>\n\n\n\n<p>2.\u6709\u754c\u7f13\u51b2\u533a<\/p>\n\n\n\n<p>\u5728\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u6a21\u5f0f\u4e2d\uff0c\u5e38\u5e38\u4f1a\u4f7f\u7528\u4e00\u4e2a\u6709\u754c\u7f13\u51b2\u533a\u6765\u5b58\u653e\u751f\u4ea7\u8005\u751f\u4ea7\u7684\u6570\u636e\uff0c\u4ee5\u53ca\u6d88\u8d39\u8005\u6d88\u8d39\u7684\u6570\u636e\u3002<code>Semaphore<\/code> \u53ef\u4ee5\u7528\u6765\u5b9e\u73b0\u8fd9\u6837\u7684\u6709\u754c\u7f13\u51b2\u533a\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-ecb0e6ee53340bff07b9179cc6efd16e\"><code>import java.util.concurrent.Semaphore;\n\npublic class BoundedBuffer {\n    private final Semaphore availableItems;\n    private final Semaphore availableSpaces;\n    private final Object&#91;] items;\n    private int putIndex = 0;\n    private int takeIndex = 0;\n\n    public BoundedBuffer(int capacity) {\n        availableItems = new Semaphore(0);\n        availableSpaces = new Semaphore(capacity);\n        items = new Object&#91;capacity];\n    }\n\n    public void put(Object item) throws InterruptedException {\n        availableSpaces.acquire();\n        try {\n            items&#91;putIndex] = item;\n            putIndex = (putIndex + 1) % items.length;\n            availableItems.release();\n        } finally {\n            \/\/ Ensure semaphore gets released even if an exception occurs\n            availableSpaces.release();\n        }\n    }\n\n    public Object take() throws InterruptedException {\n        availableItems.acquire();\n        try {\n            Object item = items&#91;takeIndex];\n            takeIndex = (takeIndex + 1) % items.length;\n            availableSpaces.release();\n            return item;\n        } finally {\n            \/\/ Ensure semaphore gets released even if an exception occurs\n            availableItems.release();\n        }\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>BoundedBuffer<\/code> \u7c7b\u5b9e\u73b0\u4e86\u4e00\u4e2a\u6709\u754c\u7f13\u51b2\u533a\uff0c\u901a\u8fc7\u4e24\u4e2a <code>Semaphore<\/code> \u5b9e\u4f8b\u6765\u63a7\u5236\u53ef\u7528\u7684\u9879\u76ee\u6570\u91cf\u548c\u7a7a\u95f2\u7a7a\u95f4\u6570\u91cf\u3002\u751f\u4ea7\u8005\u5728\u653e\u5165\u6570\u636e\u65f6\u4f1a\u5148\u83b7\u53d6\u4e00\u4e2a\u7a7a\u95f2\u7a7a\u95f4\u8bb8\u53ef\u8bc1\uff0c\u653e\u5165\u6570\u636e\u540e\u91ca\u653e\u4e00\u4e2a\u9879\u76ee\u8bb8\u53ef\u8bc1\uff1b\u6d88\u8d39\u8005\u5728\u53d6\u51fa\u6570\u636e\u65f6\u4f1a\u5148\u83b7\u53d6\u4e00\u4e2a\u9879\u76ee\u8bb8\u53ef\u8bc1\uff0c\u53d6\u51fa\u6570\u636e\u540e\u91ca\u653e\u4e00\u4e2a\u7a7a\u95f2\u7a7a\u95f4\u8bb8\u53ef\u8bc1\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u4f7f\u7528 <code>Semaphore<\/code> \u65f6\uff0c\u52a1\u5fc5\u6ce8\u610f\u6b63\u786e\u5730\u91ca\u653e\u8bb8\u53ef\u8bc1\uff0c\u907f\u514d\u51fa\u73b0\u6b7b\u9501\u6216\u8d44\u6e90\u6cc4\u6f0f\u7b49\u95ee\u9898\u3002<\/li>\n\n\n\n<li>\u4ed4\u7ec6\u8003\u8651\u8bb8\u53ef\u8bc1\u6570\u91cf\u7684\u8bbe\u7f6e\uff0c\u786e\u4fdd\u65e2\u4e0d\u4f1a\u5bfc\u81f4\u8d44\u6e90\u6d6a\u8d39\uff0c\u4e5f\u4e0d\u4f1a\u9650\u5236\u7cfb\u7edf\u7684\u5e76\u53d1\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u6ce8\u610f <code>acquire()<\/code> \u548c <code>release()<\/code> \u65b9\u6cd5\u7684\u8c03\u7528\u4f4d\u7f6e\uff0c\u786e\u4fdd\u5728\u5408\u9002\u7684\u5730\u65b9\u83b7\u53d6\u548c\u91ca\u653e\u8bb8\u53ef\u8bc1\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 Java \u5f00\u53d1\u9886\u57df\uff0c\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e00\u76f4\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8bdd\u9898\u3002\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u7684\u590d\u6742\u6027\u589e\u52a0\uff0c\u6b63\u786e\u5730\u7ba1\u7406\u591a\u7ebf\u7a0b\u53d8\u5f97\u5c24\u4e3a\u5173\u952e [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[16],"class_list":["post-3048","post","type-post","status-publish","format-standard","hentry","category-59","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6df1\u5165\u63a2\u7d22 Java Semaphore \u7c7b\uff1a\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\u5177\u4f53\u5e94\u7528<\/title>\n<meta name=\"description\" content=\"Java \u63d0\u4f9b\u4e86\u8bb8\u591a\u540c\u6b65\u673a\u5236\u6765\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u6709\u6548\u5730\u63a7\u5236\u5e76\u53d1\u8bbf\u95ee\u3002\u5176\u4e2d\u4e00\u4e2a\u5f3a\u5927\u7684\u5de5\u5177\u5c31\u662f Semaphore \u7c7b\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8 Semaphore \u7684\u6838\u5fc3\u529f\u80fd\u3001\u7c7b\u7ee7\u627f\u5173\u7cfb\u3001\u5b9e\u73b0\u539f\u7406\uff0c\u5e76\u901a\u8fc7\u5177\u4f53\u793a\u4f8b\u6765\u8bf4\u660e\u5176\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7684\u5e94\u7528\u573a\u666f\u53ca\u6ce8\u610f\u4e8b\u9879\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.talktop.cn\/?p=3048\" \/>\n<script type=\"application\/ld+json\" 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