![\"\u7a0b\u5e8f\u5458\u6da8\u5de5\u8d44\"](\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g0qv11g3stj20c4097n29.jpg\")
\n<\/p>\n\n\t\u6628\u5929\uff0c\u6211\u9762\u8bd5\u4e86\u4e0d\u5c11\u7a0b\u5e8f\u5458\uff0c\u5f88\u591a\u7a0b\u5e8f\u5458\u548c\u80cc\u4e66\u4e00\u6837\u3002\u4e8e\u662f\u540e\u9762\uff0c\u6211\u5c31\u6539\u53d8\u4e86\u4e00\u4e0b\u9762\u8bd5\u6280\u5de7\u3002\u7ed9\u6765\u7684\u4eba\uff0c\u4e00\u4eba\u4e00\u53f0\u7535\u8111\uff0c\u8981\u6c42\u5199\u51fa\u4e2a\u6b7b\u9501\u7a0b\u5e8f\uff0c\u5e76\u4e14\u4f7f\u7528 jstack \u5206\u6790\u51fa\u73b0\u95ee\u9898\u7684\u4ee3\u7801\u3002\u65f6\u95f4\u4e0d\u80fd\u8d85\u8fc7 1 \u4e2a\u534a\u5c0f\u65f6\u3002\n<\/p>\n
\n\t\u95ee\u9898\u4e00\u51fa\uff0c\u6709\u4e24\u4e2a\u7a0b\u5e8f\u5458\u8d77\u8eab\u8981\u8d70\u4e86\uff0c\u6211\u95ee\u4e3a\u4ec0\u4e48\uff1f\u56de\u7b54\uff1a“\u5199\u4e0d\u51fa\u6765”\u3002\u6bd4\u8f83\u76f4\u63a5\uff0c\u4e8e\u662f\u6211\u8ba9\u4ed6\u4eec\u5173\u6ce8\u4e86\u516c\u4f17\u53f7\uff0c\u8bf4\u660e\u5929\u516c\u5e03\u7b54\u6848\u3002\u5e76\u8ba9\u4eba\u4e8b\u9001\u4ed6\u4eec\u5230\u4e86\u7535\u68af\u53e3\u3002\n<\/p>\n
\n\t\u63a5\u4e0b\u6765\u8fd8\u6709\u4e00\u4e9b\u7a0b\u5e8f\u5458\uff0c\u62ff\u51fa\u624b\u673a\u5077\u5077\u7684\u641c\u7d22\u4e86\uff0c\u6211\u4e5f\u6ca1\u8bf4\u4ec0\u4e48\u3002\u53ea\u662f\u7ed3\u675f\u65f6\u8bf4\u7b49\u6d88\u606f\u3002\n<\/p>\n
\n\t\u53ea\u6709\u5176\u4e2d\u4e00\u4e2a\u8001\u5b9e\u7684\u7a0b\u5e8f\u5458\u5f88\u8ba4\u771f\uff0c\u6700\u7ec8\u5199\u7684\u6211\u5f88\u6ee1\u610f\u3002\n<\/p>\n
\n\t\u5e76\u4e14\u5728\u4ed6\u7684\u85aa\u8d44\u8981\u6c42\u4e0a\u4e3b\u52a8\u7ed9\u4ed6\u52a0\u4e86 1K\uff0c\u8bf4\u591a\u4e5f\u4e0d\u591a\u3002\u4e3b\u8981\u662f\u4ee5\u540e\uff0c\u85aa\u8d44\u6da8\u5e45\u4e0d\u5927\uff0c5% \u5230 10 % \u7684\u6d6e\u52a8\u3002\u6ca1\u6709\u50cf\u8df3\u69fd\u8fd9\u6837\u6765\u7684\u5feb\uff0c\u7ed9\u4ed6\u4e00\u4e2a\u8d85\u9884\u671f\u7684\u8d77\u70b9\uff0c\u5e0c\u671b\u4ed6\u80fd\u5728\u6211\u4eec\u516c\u53f8\u591a\u5f85\u51e0\u5e74\u3002\n<\/p>\n
\n\t\n<\/p>\n
\n\t\u90a3\u4e48\u5982\u4f55\u5199\u51fa\u4e00\u4e2a Java \u6b7b\u9501\u7a0b\u5e8f\u5462\uff1f\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u6211\u5df2\u5199\u5927\u5bb6\u5c31\u770b\u5f97\u660e\u767d\u3002\n<\/p>\n
\r\npublic class DeadLockTest {\r\n private static Object lock1 = new Object();\r\n private static Object lock2 = new Object();\r\n public static void main(String[] args) {\r\n new Thread(){\r\n @Override\r\n public void run() {\r\n synchronized (lock1){\r\n System.out.println("Thread1 get lock1");\r\n try {\r\n Thread.sleep(1000);\r\n } catch (InterruptedException e) {\r\n e.printStackTrace();\r\n }\r\n synchronized (lock2){\r\n System.out.println("Thread1 get lock2");\r\n }\r\n System.out.println("Thread1 end");\r\n }\r\n }\r\n }.start();\r\n\r\n new Thread(){\r\n @Override\r\n public void run() {\r\n synchronized (lock2){\r\n System.out.println("Thread2 get lock2");\r\n try {\r\n Thread.sleep(1000);\r\n } catch (InterruptedException e) {\r\n e.printStackTrace();\r\n }\r\n synchronized (lock1){\r\n System.out.println("Thread2 get lock1");\r\n }\r\n System.out.println("Thread2 end");\r\n }\r\n }\r\n }.start();\r\n }\r\n}<\/pre>\n\n\t\u4ee3\u7801\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u4e24\u4e2a\u7ebf\u7a0b\u5206\u522b\u83b7\u53d6\u5176\u4e2d\u4e00\u4e2a\u9501\uff0c\u4e0d\u91ca\u653e\u6301\u6709\u7684\u9501\uff0c\u7136\u540e\u518d\u5c1d\u8bd5\u83b7\u53d6\u53e6\u5916\u4e00\u4e2a\u9501\u3002\n<\/p>\n
\n\t\u7136\u540e\uff0c\u6211\u4eec\u901a\u8fc7 jps \u548c jstack 8902 > jstack_deadlock.log \u770b\u4e00\u4e0b\u76f8\u5173\u4fe1\u606f\u3002\n<\/p>\n
\r\n\u279c xttblog jps\r\n8947 Jps\r\n8901 Launcher\r\n1845\r\n1878 RemoteMavenServer\r\n8902 DeadLockTest\r\n\u279c xttblog jstack 8902 > jstack_deadlock.log<\/pre>\n\n\t\u7136\u540e\u901a\u8fc7\u6211\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u5bf9\u7ebf\u7a0b\u72b6\u6001\u300a\u7ebf\u7a0b\u9762\u8bd5\u5fc5\u5907\uff1a\u7ebf\u7a0b\u72b6\u6001\u548cdump\u8f93\u51fa\u72b6\u6001<\/a>\u300b\u7684\u8bf4\u660e\u3002\u6211\u4eec\u770b\u4e00\u4e0b\uff0c\u6b7b\u9501 Deadlock \u72b6\u6001\u3002\n<\/p>\n\r\n"Thread-1" #11 prio=5 os_prio=31 tid=0x00007ffeaec8d000 nid=0x3f03 waiting for monitor entry [0x000070000566e000]\r\n java.lang.Thread.State: BLOCKED (on object monitor)\r\n\tat com.dreambrewers.sms.test.DeadLockTest$2.run(DeadLockTest.java:42)\r\n\t- waiting to lock <0x0000000795b518a8> (a java.lang.Object)\r\n\t- locked <0x0000000795b518b8> (a java.lang.Object)\r\n\r\n"Thread-0" #10 prio=5 os_prio=31 tid=0x00007ffeaec8a000 nid=0x4003 waiting for monitor entry [0x000070000556b000]\r\n java.lang.Thread.State: BLOCKED (on object monitor)\r\n\tat com.dreambrewers.sms.test.DeadLockTest$1.run(DeadLockTest.java:24)\r\n\t- waiting to lock <0x0000000795b518b8> (a java.lang.Object)\r\n\t- locked <0x0000000795b518a8> (a java.lang.Object)<\/pre>\n\n\t\u4ece\u4e0a\u9762\u53ef\u4ee5\u770b\u51fa\uff0cThread-0 \u9501\u4e86 locked <0x0000000795b518a8 \u5185\u5b58\u5730\u5740> (a java.lang.Object \u9501\u7684\u5bf9\u8c61)\u3002\u7136\u540e\uff0cwaiting to lock <0x0000000795b518b8> \u7b49\u5f85\u9501\u5b9a\u53e6\u5916\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u5bf9\u8c61\u3002\n<\/p>\n
\n\t\u800c Thread-1 \u9501\u4e86 locked <0x0000000795b518b8 \u5185\u5b58\u5730\u5740> (a java.lang.Object \u9501\u7684\u5bf9\u8c61)\u3002\u7136\u540e\uff0cwaiting to lock <0x0000000795b518a8> \u7b49\u5f85\u9501\u5b9a\u53e6\u5916\u4e00\u4e2a\u5185\u5b58\u5730\u5740\uff0c\u4e5f\u5c31\u662f\u5bf9\u8c61\u3002\n<\/p>\n
\n\t\u800c jstack \u4e5f\u5f88\u660e\u786e\u7684\u5217\u51fa\u4e86\u76f8\u5173\u7ebf\u7a0b\u7684\u72b6\u6001 java.lang.Thread.State: BLOCKED (on object monitor)\u3002\n<\/p>\n
\n\t\u518d\u770b\u4e00\u4e0b jstack \u5217\u51fa\u7684\u7ebf\u7a0b\u7684\u5806\u6808\u4fe1\u606f\uff1a\n<\/p>\n
\r\nFound one Java-level deadlock:\r\n=============================\r\n"Thread-1":\r\n waiting to lock monitor 0x00007ffeae847ea8 (object 0x0000000795b518a8, a java.lang.Object),\r\n which is held by "Thread-0"\r\n"Thread-0":\r\n waiting to lock monitor 0x00007ffeae845618 (object 0x0000000795b518b8, a java.lang.Object),\r\n which is held by "Thread-1"\r\n\r\nJava stack information for the threads listed above:\r\n===================================================\r\n"Thread-1":\r\n\tat com.xttblog.test.DeadLockTest$2.run(DeadLockTest.java:42)\r\n\t- waiting to lock <0x0000000795b518a8> (a java.lang.Object)\r\n\t- locked <0x0000000795b518b8> (a java.lang.Object)\r\n"Thread-0":\r\n\tat com.xttblog.test.DeadLockTest$1.run(DeadLockTest.java:24)\r\n\t- waiting to lock <0x0000000795b518b8> (a java.lang.Object)\r\n\t- locked <0x0000000795b518a8> (a java.lang.Object)\r\n\r\nFound 1 deadlock.<\/pre>\n\n\t\u5b9a\u4f4d\u5230\u76f8\u5173\u7684 Java \u4ee3\u7801 DeadLockTest.java \u7b2c 24 \u884c\u548c 42 \u884c\u3002\n<\/p>\n
\n\t\u6700\u540e\uff0c\u4f60\u4eec\u8bf4\u8fd9\u6837\u7684\u7a0b\u5e8f\u5458\uff0c\u6211\u8be5\u4e0d\u8be5\u7ed9\u4ed6\u4e3b\u52a8\u4e0a\u8c03\u5165\u804c\u85aa\u8d44\uff1f<\/p>\n
![\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/](\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\")
<\/p>
\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1axttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a\u4e1a\u4f59\u8349<\/a>\uff1a » \u53ea\u56e0\u4e00\u4e2a\u6b7b\u9501\u7a0b\u5e8f\u548c jstack \u5206\u6790\uff0c\u6211\u7ed9\u9762\u8bd5\u7684\u7a0b\u5e8f\u5458\u4e3b\u52a8\u52a0\u85aa 1 K<\/a><\/p>","protected":false},"excerpt":{"rendered":"\u6628\u5929\uff0c\u6211\u9762\u8bd5\u4e86\u4e0d\u5c11\u7a0b\u5e8f\u5458\uff0c\u5f88\u591a\u7a0b\u5e8f\u5458\u548c\u80cc\u4e66\u4e00\u6837\u3002\u4e8e\u662f\u540e\u9762\uff0c\u6211\u5c31\u6539\u53d8\u4e86\u4e00\u4e0b\u9762\u8bd5\u6280\u5de7\u3002\u7ed9\u6765\u7684\u4eba\uff0c\u4e00\u4eba\u4e00\u53f0\u7535\u8111\uff0c\u8981\u6c42 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[565,945,200,202,1931],"class_list":["post-3953","post","type-post","status-publish","format-standard","hentry","category-java","tag-java-","tag-jstack","tag-locked","tag-1931"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3953"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3953\/revisions"}],"predecessor-version":[{"id":3954,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/3953\/revisions\/3954"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}