1\u3001\tsynchronized \u4f5c\u7528
\n\u539f\u5b50\u6027\uff1asynchronized\u4fdd\u8bc1\u8bed\u53e5\u5757\u5185\u64cd\u4f5c\u662f\u539f\u5b50\u7684
\n\u53ef\u89c1\u6027\uff1asynchronized\u4fdd\u8bc1\u53ef\u89c1\u6027\uff08\u901a\u8fc7"\u5728\u6267\u884cunlock\u4e4b\u524d\uff0c\u5fc5\u987b\u5148\u628a\u6b64\u53d8\u91cf\u540c\u6b65\u56de\u4e3b\u5185\u5b58\u201d\u5b9e\u73b0\uff09
\n\u6709\u5e8f\u6027\uff1asynchronized\u4fdd\u8bc1\u6709\u5e8f\u6027\uff08\u901a\u8fc7"\u4e00\u4e2a\u53d8\u91cf\u5728\u540c\u4e00\u65f6\u523b\u53ea\u5141\u8bb8\u4e00\u6761\u7ebf\u7a0b\u5bf9\u5176\u8fdb\u884clock \u64cd\u4f5c\u201d\uff09
\n2\u3001synchronized \u7684\u4f7f\u7528
\n3\u3001
\n\u4fee\u9970\u5b9e\u4f8b\u65b9\u6cd5\uff0c\u5bf9\u5f53\u524d\u5b9e\u4f8b\u5bf9\u8c61\u52a0\u9501
\n\u4fee\u9970\u9759\u6001\u65b9\u6cd5\uff0c\u591a\u5f53\u524d\u7c7b\u7684Class\u5bf9\u8c61\u52a0\u9501
\n\u4fee\u9970\u4ee3\u7801\u5757\uff0c\u5bf9synchronized\u62ec\u53f7\u5185\u7684\u5bf9\u8c61\u52a0\u9501
\n3\u3001\tsynchronized \u5b9e\u73b0\u539f\u7406
\njvm\u57fa\u4e8e\u8fdb\u5165\u548c\u9000\u51faMonitor\u5bf9\u8c61\u6765\u5b9e\u73b0\u65b9\u6cd5\u540c\u6b65\u548c\u4ee3\u7801\u5757\u540c\u6b65
\n\u65b9\u6cd5\u7ea7\u7684\u540c\u6b65\u662f\u9690\u5f0f\uff0c\u5373\u65e0\u9700\u901a\u8fc7\u5b57\u8282\u7801\u6307\u4ee4\u6765\u63a7\u5236\u7684\uff0c\u5b83\u5b9e\u73b0\u5728\u65b9\u6cd5\u8c03\u7528\u548c\u8fd4\u56de\u64cd\u4f5c\u4e4b\u4e2d\u3002
\nJVM\u53ef\u4ee5\u4ece\u65b9\u6cd5\u5e38\u91cf\u6c60\u4e2d\u7684\u65b9\u6cd5\u8868\u7ed3\u6784\uff08method_info Structure\uff09\u4e2d\u7684ACC_SYNCHRONIZED\u8bbf
\n\u95ee\u6807\u5fd7\u533a\u5206\u4e00\u4e2a\u65b9\u6cd5\u662f\u5426\u540c\u6b65\u65b9\u6cd5\u3002\u5f53\u65b9\u6cd5\u8c03\u7528\u65f6\uff0c\u8c03\u7528\u6307\u4ee4\u5c06\u4f1a\u68c0\u67e5\u65b9\u6cd5\u7684
\nACC_SYNCHRONIZED\u8bbf\u95ee\u6807\u5fd7\u662f\u5426\u88ab\u8bbe\u7f6e\uff0c\u5982\u679c\u8bbe\u7f6e\u4e86\uff0c\u6267\u884c\u7ebf\u7a0b\u5c06\u5148\u6301\u6709monitor (\u865a\u62df\u673a \u89c4\u8303\u4e2d\u7528\u7684\u662f\u7ba1\u7a0b\u4e00\u8bcd)\uff0c\u7136\u540e\u518d\u6267\u884c\u65b9\u6cd5\uff0c\u6700\u540e\u518d\u65b9\u6cd5\u5b8c\u6210(\u65e0\u8bba\u662f\u6b63\u5e38\u5b8c\u6210\u8fd8\u662f\u975e\u6b63\u5e38\u5b8c \u6210)\u65f6\u91ca\u653emonitor\u3002
\n\u4ee3\u7801\u5757\u7684\u540c\u6b65\u662f\u5229\u7528monitorenter\u548cmonitorexit\u8fd9\u4e24\u4e2a\u5b57\u8282\u7801\u6307\u4ee4\u3002\u5b83\u4eec\u5206\u522b\u4f4d\u4e8e\u540c\u6b65\u4ee3 \u7801\u5757\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u4f4d\u7f6e\u3002\u5f53jvm\u6267\u884c\u5230monitorenter\u6307\u4ee4\u65f6\uff0c\u5f53\u524d\u7ebf\u7a0b\u8bd5\u56fe\u83b7\u53d6monitor\u5bf9 \u8c61\u7684\u6240\u6709\u6743\uff0c\u5982\u679c\u672a\u52a0\u9501\u6216\u8005\u5df2\u7ecf\u88ab\u5f53\u524d\u7ebf\u7a0b\u6240\u6301\u6709\uff0c\u5c31\u628a\u9501\u7684\u8ba1\u6570\u5668+1;\u5f53\u6267\u884cmonitorexit \u6307\u4ee4\u65f6\uff0c\u9501\u8ba1\u6570\u5668-1;\u5f53\u9501\u8ba1\u6570\u5668\u4e3a0\u65f6\uff0c\u8be5\u9501\u5c31\u88ab\u91ca\u653e\u4e86\u3002\u5982\u679c\u83b7\u53d6monitor\u5bf9\u8c61\u5931\u8d25\uff0c\u8be5 \u7ebf\u7a0b\u5219\u4f1a\u8fdb\u5165\u963b\u585e\u72b6\u6001\uff0c\u76f4\u5230\u5176\u4ed6\u7ebf\u7a0b\u91ca\u653e\u9501\u3002
\n\u8fd9\u91cc\u8981\u6ce8\u610f\uff1a
\n1\u3001\tsynchronized\u662f\u53ef\u91cd\u5165\u7684\uff0c\u6240\u4ee5\u4e0d\u4f1a\u81ea\u5df1\u628a\uff0c\u81ea\u5df1\u9501\u6b7b
\n2\u3001\tsynchronized\u9501\u4e00\u65e6\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u6301\u6709\uff0c\u5176\u4ed6\u8bd5\u56fe\u83b7\u53d6\u8be5\u9501\u7684\u7ebf\u7a0b\u5c06\u88ab\u963b\u585e\u3002
\n\u5173\u4e8eACC_SYNCHRONIZED\u3001monitorenter\u3001monitorexit\u6307\u4ee4\uff0c\u53ef\u4ee5\u770b\u4e00\u4e0b\u4e0b\u9762\u7684\u53cd\u7f16\u8bd1\u4ee3\u7801:
\npublic class SynchronizedDemo {
\npublic synchronized void f() {\t\/\/\u8fd9\u4e2a\u662f\u540c\u6b65\u65b9\u6cd5
\nSystem.out.println("Hello world");
\n}
\npublic void g() {
\nsynchronized (this) {\t\/\/\u8fd9\u4e2a\u662f\u540c\u6b65\u4ee3\u7801\u5757
\nSystem.out.println("Hello world");
\n}
\n}
\npublic static void main(String[] args) {
\n}
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
1\u3001 synchronized \u4f5c\u7528 \u539f\u5b50\u6027\uff1asynchronized\u4fdd\u8bc1\u8bed\u53e5\u5757\u5185\u64cd\u4f5c\u662f\u539f\u5b50\u7684 \u53ef\u89c1\u6027\uff1asyn […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[118],"tags":[],"class_list":["post-10221","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10221"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10221\/revisions"}],"predecessor-version":[{"id":10222,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10221\/revisions\/10222"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10221"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}