{"id":3997,"date":"2025-07-28T21:27:57","date_gmt":"2025-07-28T13:27:57","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3997"},"modified":"2025-07-28T21:27:57","modified_gmt":"2025-07-28T13:27:57","slug":"%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3%e6%ad%bb%e9%94%81%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/07\/28\/%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3%e6%ad%bb%e9%94%81%e9%97%ae%e9%a2%98%ef%bc%9f\/","title":{"rendered":"\u5982\u4f55\u89e3\u51b3\u6b7b\u9501\u95ee\u9898\uff1f"},"content":{"rendered":"\n

\u6b7b\u9501\uff08Deadlock\uff09<\/strong> \u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u5e38\u89c1\u7684\u95ee\u9898\u4e4b\u4e00\uff0c\u53d1\u751f\u5728\u591a\u4e2a\u7ebf\u7a0b\u5f7c\u6b64\u6301\u6709\u5bf9\u65b9\u9700\u8981\u7684\u8d44\u6e90\uff0c\u4e14\u90fd\u5728\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u8d44\u6e90<\/strong>\u65f6\uff0c\u5bfc\u81f4\u7cfb\u7edf\u6c38\u4e45\u963b\u585e\u3002<\/p>\n\n\n\n

\n\n\n\n

\u4e00\u3001\u6b7b\u9501\u7684\u56db\u4e2a\u5fc5\u8981\u6761\u4ef6<\/h2>\n\n\n\n

\u6839\u636e\u201cCoffman \u6761\u4ef6<\/strong>\u201d\uff0c\u6b7b\u9501\u7684\u53d1\u751f\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\u4ee5\u4e0b\u56db\u4e2a\u6761\u4ef6\uff1a<\/p>\n\n\n\n

    \n
  1. \u4e92\u65a5\u6761\u4ef6<\/strong>\uff1a\u8d44\u6e90\u4e00\u6b21\u53ea\u80fd\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u5360\u7528\u3002<\/li>\n\n\n\n
  2. \u5360\u6709\u4e14\u7b49\u5f85<\/strong>\uff1a\u7ebf\u7a0b\u6301\u6709\u90e8\u5206\u8d44\u6e90\uff0c\u540c\u65f6\u7b49\u5f85\u5176\u5b83\u8d44\u6e90\u3002<\/li>\n\n\n\n
  3. \u4e0d\u53ef\u62a2\u5360<\/strong>\uff1a\u7ebf\u7a0b\u5df2\u83b7\u5f97\u8d44\u6e90\u4e0d\u80fd\u88ab\u5f3a\u5236\u91ca\u653e\u3002<\/li>\n\n\n\n
  4. \u5faa\u73af\u7b49\u5f85<\/strong>\uff1a\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5f62\u6210\u4e00\u79cd\u201c\u73af\u5f62\u201d\u8d44\u6e90\u7b49\u5f85\u5173\u7cfb\u3002<\/li>\n<\/ol>\n\n\n\n

    \u6253\u7834\u4efb\u4e00\u6761\u4ef6\uff0c\u90fd\u53ef\u4ee5\u907f\u514d\u6b7b\u9501\u3002<\/strong><\/p>\n\n\n\n

    \n\n\n\n

    \u4e8c\u3001\u6b7b\u9501\u7684\u7ecf\u5178\u793a\u4f8b\uff08Java\uff09<\/h2>\n\n\n\n
    public class DeadlockExample {\n    private static final Object lock1 = new Object();\n    private static final Object lock2 = new Object();\n\n    public static void main(String[] args) {\n        Thread t1 = new Thread(() -> {\n            synchronized (lock1) {\n                System.out.println(\"Thread-1 locked lock1\");\n                try { Thread.sleep(100); } catch (InterruptedException ignored) {}\n                synchronized (lock2) {\n                    System.out.println(\"Thread-1 locked lock2\");\n                }\n            }\n        });\n\n        Thread t2 = new Thread(() -> {\n            synchronized (lock2) {\n                System.out.println(\"Thread-2 locked lock2\");\n                try { Thread.sleep(100); } catch (InterruptedException ignored) {}\n                synchronized (lock1) {\n                    System.out.println(\"Thread-2 locked lock1\");\n                }\n            }\n        });\n\n        t1.start();\n        t2.start();\n    }\n}<\/code><\/pre>\n\n\n\n
    \n
    \u7ed3\u679c\uff1a\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u5728\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u8d44\u6e90\uff0c\u4ea7\u751f\u6b7b\u9501\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    \u4e09\u3001\u89e3\u51b3\u6b7b\u9501\u7684\u65b9\u6cd5<\/h2>\n\n\n\n
    \u65b9\u6cd5 1\uff1a\u7834\u574f\u5faa\u73af\u7b49\u5f85 \u2014\u2014 \u56fa\u5b9a\u9501\u987a\u5e8f<\/strong><\/h3>\n\n\n\n
    \u59cb\u7ec8\u4ee5\u56fa\u5b9a\u987a\u5e8f\u83b7\u53d6\u9501\uff0c\u9632\u6b62\u4e92\u76f8\u7b49\u5f85\u3002<\/p>\n\n\n\n
    \/\/ \u4f7f\u7528 hashCode \u6bd4\u8f83\u51b3\u5b9a\u52a0\u9501\u987a\u5e8f\nObject lockA = new Object();\nObject lockB = new Object();\n\nvoid doSafeLocking(Object o1, Object o2) {\n    Object first = o1.hashCode() < o2.hashCode() ? o1 : o2;\n    Object second = o1.hashCode() < o2.hashCode() ? o2 : o1;\n\n    synchronized (first) {\n        synchronized (second) {\n            \/\/ \u4e1a\u52a1\u903b\u8f91\n        }\n    }\n}<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    \u65b9\u6cd5 2\uff1a\u5c1d\u8bd5\u9501\uff08tryLock\uff09 + \u8d85\u65f6 + \u56de\u9000\u673a\u5236<\/strong><\/h3>\n\n\n\n
    \u4f7f\u7528 ReentrantLock.tryLock()<\/code> \u907f\u514d\u6c38\u4e45\u7b49\u5f85\u3002<\/p>\n\n\n\n
    ReentrantLock lock1 = new ReentrantLock();\nReentrantLock lock2 = new ReentrantLock();\n\nboolean acquired = false;\n\ntry {\n    if (lock1.tryLock(100, TimeUnit.MILLISECONDS)) {\n        if (lock2.tryLock(100, TimeUnit.MILLISECONDS)) {\n            acquired = true;\n            \/\/ \u6267\u884c\u4e1a\u52a1\n        }\n    }\n} catch (InterruptedException e) {\n    e.printStackTrace();\n} finally {\n    if (acquired) {\n        lock2.unlock();\n        lock1.unlock();\n    }\n}<\/code><\/pre>\n\n\n\n
    \n
    \u9632\u6b62\u6c38\u4e45\u963b\u585e\uff0c\u9002\u5408\u9ad8\u5e76\u53d1\u7cfb\u7edf\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    \u65b9\u6cd5 3\uff1a\u907f\u514d\u8d44\u6e90\u5360\u7528\u5e76\u7b49\u5f85<\/strong><\/h3>\n\n\n\n
    \u5c06\u6240\u6709\u9700\u8981\u7684\u8d44\u6e90\u4e00\u6b21\u6027\u83b7\u53d6\uff08\u52a0\u9501\uff09\uff0c\u907f\u514d\u5148\u5360\u4e00\u90e8\u5206\u518d\u7b49\u53e6\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n
    synchronized (lock1) {\n    synchronized (lock2) {\n        \/\/ \u83b7\u53d6\u5168\u90e8\u8d44\u6e90\u540e\u518d\u6267\u884c\n    }\n}<\/code><\/pre>\n\n\n\n
    \n
    \u867d\u7136\u4ee3\u7801\u7b80\u5355\uff0c\u4f46\u9700\u8981\u4efb\u52a1\u53ef\u4e00\u6b21\u62ff\u5230\u6240\u6709\u8d44\u6e90\u624d\u9002\u7528\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n\n\n\n
    \u65b9\u6cd5 4\uff1a\u4f7f\u7528\u7ebf\u7a0b\u8c03\u5ea6\u6216\u9501\u7ba1\u7406\u6846\u67b6\uff08\u9ad8\u7ea7\u89e3\u51b3\u65b9\u6848\uff09<\/strong><\/h3>\n\n\n\n