{"id":3952,"date":"2025-07-20T11:14:48","date_gmt":"2025-07-20T03:14:48","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3952"},"modified":"2025-07-20T11:14:48","modified_gmt":"2025-07-20T03:14:48","slug":"%e5%a6%82%e4%bd%95%e7%94%a8-signalall-%e5%ae%9e%e7%8e%b0%e5%b9%bf%e6%92%ad%e5%bc%8f%e5%94%a4%e9%86%92%e7%b3%bb%e7%bb%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/20\/%e5%a6%82%e4%bd%95%e7%94%a8-signalall-%e5%ae%9e%e7%8e%b0%e5%b9%bf%e6%92%ad%e5%bc%8f%e5%94%a4%e9%86%92%e7%b3%bb%e7%bb%9f\/","title":{"rendered":"\u5982\u4f55\u7528 signalAll() \u5b9e\u73b0\u201c\u5e7f\u64ad\u201d\u5f0f\u5524\u9192\u7cfb\u7edf"},"content":{"rendered":"\n<p>\u4f60\u60f3\u7528 <code>Condition.signalAll()<\/code> \u5b9e\u73b0\u201c\u5e7f\u64ad\u201d\u5f0f\u5524\u9192\u7cfb\u7edf\uff0c\u6838\u5fc3\u5c31\u662f\u5524\u9192\u6240\u6709\u7b49\u5f85\u67d0\u4e2a\u6761\u4ef6\u7684\u7ebf\u7a0b\uff0c\u8ba9\u5b83\u4eec\u4e00\u8d77\u54cd\u5e94\u72b6\u6001\u53d8\u5316\u6216\u4e8b\u4ef6\u901a\u77e5\u3002\u4ee5\u4e0b\u7ed9\u4f60\u4e00\u4efd\u8be6\u7ec6\u5b9e\u6218\u793a\u4f8b\u4e0e\u8bbe\u8ba1\u601d\u8def\uff0c\u5e2e\u52a9\u4f60\u5feb\u901f\u638c\u63e1\u8fd9\u4e2a\u6a21\u5f0f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. \u8bbe\u8ba1\u76ee\u6807<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6709\u591a\u4e2a\u7ebf\u7a0b\u7b49\u5f85\u67d0\u4e2a\u6761\u4ef6\uff08\u5982\u5171\u4eab\u72b6\u6001\u53d8\u5316\uff09<\/li>\n\n\n\n<li>\u4e3b\u7ebf\u7a0b\u6216\u67d0\u4e2a\u7ebf\u7a0b\u72b6\u6001\u53d8\u5316\u65f6\uff0c<strong>\u4e00\u6b21\u8c03\u7528 <code>signalAll()<\/code><\/strong> \u5524\u9192\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b<\/li>\n\n\n\n<li>\u5524\u9192\u7684\u7ebf\u7a0b\u90fd\u8981\u91cd\u65b0\u68c0\u67e5\u6761\u4ef6\uff0c\u786e\u4fdd\u5b89\u5168\u6267\u884c<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. \u57fa\u672c\u5b9e\u73b0\u4ee3\u7801\u793a\u4f8b\uff08Java\uff09<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.concurrent.locks.Condition;\nimport java.util.concurrent.locks.ReentrantLock;\n\npublic class BroadcastSystem {\n\n    private final ReentrantLock lock = new ReentrantLock();\n    private final Condition condition = lock.newCondition();\n\n    \/\/ \u5171\u4eab\u72b6\u6001\n    private boolean conditionMet = false;\n\n    \/\/ \u7b49\u5f85\u7ebf\u7a0b\u6267\u884c\u65b9\u6cd5\n    public void awaitCondition() throws InterruptedException {\n        lock.lock();\n        try {\n            while (!conditionMet) {\n                System.out.println(Thread.currentThread().getName() + \" \u7b49\u5f85\u4e2d...\");\n                condition.await();\n            }\n            System.out.println(Thread.currentThread().getName() + \" \u88ab\u5524\u9192\uff0c\u6761\u4ef6\u6ee1\u8db3\uff01\");\n            \/\/ \u5904\u7406\u540e\uff0c\u91cd\u7f6e\u72b6\u6001\u6216\u6839\u636e\u5b9e\u9645\u4e1a\u52a1\u51b3\u5b9a\u662f\u5426\u91cd\u7f6e\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u5e7f\u64ad\u5524\u9192\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b\n    public void broadcast() {\n        lock.lock();\n        try {\n            conditionMet = true; \/\/ \u6539\u53d8\u5171\u4eab\u72b6\u6001\n            condition.signalAll(); \/\/ \u5e7f\u64ad\u5524\u9192\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b\n            System.out.println(\"\u5e7f\u64ad\u4fe1\u53f7\uff0c\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b\u88ab\u5524\u9192\");\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u91cd\u7f6e\u72b6\u6001\u4ee5\u4fbf\u91cd\u65b0\u7b49\u5f85\n    public void reset() {\n        lock.lock();\n        try {\n            conditionMet = false;\n            System.out.println(\"\u6761\u4ef6\u91cd\u7f6e\uff0c\u7b49\u5f85\u7ebf\u7a0b\u53ef\u518d\u6b21\u963b\u585e\");\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u6d4b\u8bd5\n    public static void main(String&#91;] args) throws InterruptedException {\n        BroadcastSystem bs = new BroadcastSystem();\n\n        \/\/ \u542f\u52a8\u591a\u4e2a\u7b49\u5f85\u7ebf\u7a0b\n        for (int i = 0; i &lt; 5; i++) {\n            new Thread(() -&gt; {\n                try {\n                    bs.awaitCondition();\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                }\n            }, \"\u7ebf\u7a0b-\" + i).start();\n        }\n\n        Thread.sleep(2000);\n\n        \/\/ \u4e3b\u7ebf\u7a0b\u5e7f\u64ad\u5524\u9192\n        bs.broadcast();\n\n        Thread.sleep(2000);\n\n        \/\/ \u91cd\u7f6e\u72b6\u6001\uff0c\u6a21\u62df\u518d\u6b21\u7b49\u5f85\n        bs.reset();\n\n        \/\/ \u518d\u6b21\u542f\u52a8\u7b49\u5f85\u7ebf\u7a0b\n        for (int i = 5; i &lt; 7; i++) {\n            new Thread(() -&gt; {\n                try {\n                    bs.awaitCondition();\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                }\n            }, \"\u7ebf\u7a0b-\" + i).start();\n        }\n\n        Thread.sleep(2000);\n        bs.broadcast();\n    }\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u5173\u952e\u70b9\u8bf4\u660e<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u5173\u952e\u70b9<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead><tbody><tr><td><strong>\u4f7f\u7528 <code>while<\/code> \u5faa\u73af<\/strong><\/td><td>\u9632\u6b62\u865a\u5047\u5524\u9192\uff0c\u5524\u9192\u540e\u91cd\u65b0\u68c0\u6d4b\u6761\u4ef6<\/td><\/tr><tr><td><strong>\u5171\u4eab\u72b6\u6001 <code>conditionMet<\/code><\/strong><\/td><td>\u4f5c\u4e3a\u6761\u4ef6\u5224\u65ad\u7684\u4f9d\u636e\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5524\u9192\u540e\u6267\u884c\u5b89\u5168<\/td><\/tr><tr><td><strong><code>signalAll()<\/code> \u5e7f\u64ad<\/strong><\/td><td>\u4e00\u6b21\u5524\u9192\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b\uff0c\u4fdd\u8bc1\u6240\u6709\u7ebf\u7a0b\u5747\u80fd\u83b7\u5f97\u901a\u77e5<\/td><\/tr><tr><td><strong>\u9501\u4fdd\u62a4\u72b6\u6001\u53d8\u91cf<\/strong><\/td><td>\u5171\u4eab\u53d8\u91cf\u4fee\u6539\u5fc5\u987b\u5728\u9501\u5185\uff0c\u4fdd\u8bc1\u53ef\u89c1\u6027\u548c\u539f\u5b50\u6027<\/td><\/tr><tr><td><strong>\u7ebf\u7a0b\u91cd\u7528\u903b\u8f91<\/strong><\/td><td>\u72b6\u6001\u91cd\u7f6e\u65b9\u4fbf\u591a\u8f6e\u7b49\u5f85\u4e0e\u5e7f\u64ad\uff0c\u9002\u5408\u5faa\u73af\u5e7f\u64ad\u573a\u666f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u5178\u578b\u9002\u7528\u573a\u666f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u4e2a\u6d88\u8d39\u8005\u7b49\u5f85\u8d44\u6e90\u53ef\u7528\uff0c\u8d44\u6e90\u53d8\u5316\u65f6\u901a\u77e5\u6240\u6709\u6d88\u8d39\u8005\u91cd\u65b0\u7ade\u4e89<\/li>\n\n\n\n<li>\u914d\u7f6e\u3001\u72b6\u6001\u53d8\u66f4\u5e7f\u64ad\u7ed9\u591a\u4e2a\u76d1\u542c\u7ebf\u7a0b<\/li>\n\n\n\n<li>\u7ebf\u7a0b\u5c4f\u969c\u3001\u4e8b\u4ef6\u901a\u77e5\uff0c\u6240\u6709\u7b49\u5f85\u7ebf\u7a0b\u540c\u65f6\u7ee7\u7eed\u6267\u884c<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>signalAll()<\/code> \u4f1a\u5524\u9192\u6240\u6709\u7ebf\u7a0b\uff0c\u5bb9\u6613\u5f15\u8d77\u201c\u60ca\u7fa4\u6548\u5e94\u201d\uff0c\u77ed\u65f6\u95f4\u5185\u5927\u91cf\u7ebf\u7a0b\u4e89\u62a2 CPU\uff0c\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d<\/li>\n\n\n\n<li>\u5728\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\uff0c\u53ef\u4ee5\u7ed3\u5408\u7ebf\u7a0b\u6c60\u9650\u6d41\u3001\u5206\u6279\u5524\u9192\u7b49\u7b56\u7565\u4f18\u5316\u6027\u80fd<\/li>\n\n\n\n<li>\u786e\u4fdd\u5524\u9192\u7ebf\u7a0b\u90fd\u80fd\u5b89\u5168\u5224\u65ad\u6761\u4ef6\uff0c\u907f\u514d\u9519\u8bef\u6267\u884c<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. \u5ef6\u4f38\uff1a\u5206\u7ec4\u5e7f\u64ad\u4e0e\u4fe1\u53f7\u63a7\u5236<\/h2>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u7528\u591a\u4e2a <code>Condition<\/code> \u5bf9\u8c61\u533a\u5206\u4e0d\u540c\u201c\u5e7f\u64ad\u7ec4\u201d\uff0c\u5b9e\u73b0\u66f4\u7ec6\u7c92\u5ea6\u7684\u5524\u9192\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. \u53c2\u8003\u8d44\u6599<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.oracle.com\/javase\/8\/docs\/api\/java\/util\/concurrent\/locks\/Condition.html\">Java\u5b98\u65b9\u6587\u6863 &#8211; Condition\u63a5\u53e3<\/a><\/li>\n\n\n\n<li>\u300aJava\u5e76\u53d1\u7f16\u7a0b\u5b9e\u6218\u300b\u2014 \u7ebf\u7a0b\u95f4\u901a\u4fe1\u7ae0\u8282<\/li>\n\n\n\n<li><a href=\"https:\/\/www.baeldung.com\/java-reentrantlock\">ReentrantLock\u4e0eCondition\u6e90\u7801\u5206\u6790<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f60\u60f3\u7528 Condition.signalAll() \u5b9e\u73b0\u201c\u5e7f\u64ad\u201d\u5f0f\u5524\u9192\u7cfb\u7edf\uff0c\u6838\u5fc3\u5c31\u662f\u5524\u9192\u6240\u6709\u7b49\u5f85\u67d0\u4e2a\u6761\u4ef6\u7684\u7ebf\u7a0b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3953,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,68],"tags":[],"class_list":["post-3952","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-","category-java"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3952","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3952"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3952\/revisions"}],"predecessor-version":[{"id":3954,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3952\/revisions\/3954"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3953"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3952"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3952"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3952"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}