\u5728\u540c\u4e00\u7a0b\u5e8f\u4e2d\u8fd0\u884c\u591a\u4e2a\u7ebf\u7a0b\u672c\u8eab\u4e0d\u4f1a\u5bfc\u81f4\u95ee\u9898\uff0c\u95ee\u9898\u5728\u4e8e\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u4e86\u76f8\u540c\u7684\u8d44\u6e90\u3002\u5982\uff0c\u540c \u2014\u5185\u5b58\u533a(\u53d8\u91cf\uff0c\u6570\u7ec4\uff0c\u6216\u5bf9\u8c61)\u3001\u7cfb\u7edf(\u6570\u636e\u5e93\uff0cweb services\u7b49)\u6216\u6587\u4ef6\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9 \u4e9b\u95ee\u9898\u53ea\u6709\u5728\u4e00\u6216\u591a\u4e2a\u7ebf\u7a0b\u5411\u8fd9\u4e9b\u8d44\u6e90\u505a\u4e86\u5199\u64cd\u4f5c\u65f6\u624d\u6709\u53ef\u80fd\u53d1\u751f\uff0c\u53ea\u8981\u8d44\u6e90\u6ca1\u6709\u53d1\u751f\u53d8\u5316, \u591a\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\u76f8\u540c\u7684\u8d44\u6e90\u5c31\u662f\u5b89\u5168\u7684\u3002
\n\u591a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u51fa\u9519\uff1a
\npublic class Counter {
\nprotected long count = 0;
\npublic void add(long value){
\nthis.count = this.count + value;
\n}
\n\u60f3\u8c61\u4e0b\u7ebf\u7a0bA\u548cB\u540c\u65f6\u6267\u884c\u540c\u4e00\u4e2aCounter\u5bf9\u8c61\u7684add()\u65b9\u6cd5\uff0c\u6211\u4eec\u65e0\u6cd5\u77e5\u9053\u64cd\u4f5c\u7cfb\u7edf\u4f55 \u65f6\u4f1a\u5728\u4e24\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5207\u6362\u3002JVM\u5e76\u4e0d\u662f\u5c06\u8fd9\u6bb5\u4ee3\u7801\u89c6\u4e3a\u5355\u6761\u6307\u4ee4\u6765\u6267\u884c\u7684\uff0c\u800c\u662f\u6309\u7167\u4e0b\u9762\u7684\u987a \u5e8f\uff1a
\n\u4ece\u5185\u5b58\u83b7\u53d6this.count\u7684\u503c\u653e\u5230\u5bc4\u5b58\u5668
\n\u5c06\u5bc4\u5b58\u5668\u4e2d\u7684\u503c\u589e\u52a0value
\n\u5c06\u5bc4\u5b58\u5668\u4e2d\u7684\u503c\u5199\u56de\u5185\u5b58<\/p>\n
\u89c2\u5bdf\u7ebf\u7a0bA\u548cB\u4ea4\u9519\u6267\u884c\u4f1a\u53d1\u751f\u4ec0\u4e48:
\nthis.count = 0;
\nA\uff1a\u8bfb\u53d6this.count\u5230\u4e00\u4e2a\u5bc4\u5b58\u5668(0)
\nB\uff1a\u8bfb\u53d6this.count\u5230\u4e00\u4e2a\u5bc4\u5b58\u5668(0)
\nB\uff1a\u5c06\u5bc4\u5b58\u5668\u7684\u503c\u52a02
\nB\uff1a\u56de\u5199\u5bc4\u5b58\u5668\u503c(2)\u5230\u5185\u5b58.this.count\u73b0\u5728\u7b49\u4e8e2
\nA\uff1a\u5c06\u5bc4\u5b58\u5668\u7684\u503c\u52a03
\nA\uff1a\u56de\u5199\u5bc4\u5b58\u5668\u503c(3)\u5230\u5185\u5b58.this.count\u73b0\u5728\u7b49\u4e8e3
\n\u4e24\u4e2a\u7ebf\u7a0b\u5206\u522b\u52a0\u4e86 2\u548c3\u5230count\u53d8\u91cf\u4e0a\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u6267\u884c\u7ed3\u675f\u540ecount\u53d8\u91cf\u7684\u503c\u5e94\u8be5\u7b49\u4e8e 5\u3002\u7136\u800c\u7531\u4e8e\u4e24\u4e2a\u7ebf\u7a0b\u662f\u4ea4\u53c9\u6267\u884c\u7684\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u4ece\u5185\u5b58\u4e2d\u8bfb\u51fa\u7684\u521d\u59cb\u503c\u90fd\u662f0\u3002\u7136\u540e\u5404\u81ea\u52a0\u4e86 2 \u548c3,\u5e76\u5206\u522b\u5199\u56de\u5185\u5b58\u3002\u6700\u7ec8\u7684\u503c\u5e76\u4e0d\u662f\u671f\u671b\u76845,\u800c\u662f\u6700\u540e\u5199\u56de\u5185\u5b58\u7684\u90a3\u4e2a\u7ebf\u7a0b\u7684\u503c\uff0c\u4e0a\u9762 \u4f8b\u5b50\u4e2d\u6700\u540e\u5199\u56de\u5185\u5b58\u7684\u662f\u7ebf\u7a0bA,\u4f46\u5b9e\u9645\u4e2d\u4e5f\u53ef\u80fd\u662f\u7ebf\u7a0bB\u3002\u5982\u679c\u6ca1\u6709\u91c7\u7528\u5408\u9002\u7684\u540c\u6b65\u673a\u5236\uff0c \u7ebf\u7a0b\u95f4\u7684\u4ea4\u53c9\u6267\u884c\u60c5\u51b5\u5c31\u65e0\u6cd5\u9884\u6599\u3002
\n\u7ade\u4e89\u6761\u4ef6(race condition)<\/p>\n
\u5f53\u4e24\u4e2a\u7ebf\u7a0b\u7ade\u4e89\u540c\u4e00\u8d44\u6e90\u65f6\uff0c\u5982\u679c\u5bf9\u8d44\u6e90\u7684\u8bbf\u95ee\u987a\u5e8f\u654f\u611f\uff0c\u5c31\u79f0\u5b58\u5728\u7ade\u6001\u6761\u4ef6\u3002<\/p>\n
\u4e34\u754c\u533a(critical area)<\/p>\n
\u5bfc\u81f4\u7ade\u6001\u6761\u4ef6\u53d1\u751f\u7684\u4ee3\u7801\u533a\u79f0\u4f5c\u4e34\u754c\u533a\u3002<\/p>\n
\u4e0a\u4f8b\u4e2dadd()\u65b9\u6cd5\u5c31\u662f\u4e00\u4e2a\u4e34\u754c\u533a\uff0c\u5b83\u4f1a\u4ea7\u751f\u7ade\u6001\u6761\u4ef6\u3002\u5728\u4e34\u754c\u533a\u4e2d\u4f7f\u7528\u9002\u5f53\u7684\u540c\u6b65\u5c31\u53ef\u4ee5\u907f \u514d\u7ade\u6001\u6761\u4ef6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u540c\u4e00\u7a0b\u5e8f\u4e2d\u8fd0\u884c\u591a\u4e2a\u7ebf\u7a0b\u672c\u8eab\u4e0d\u4f1a\u5bfc\u81f4\u95ee\u9898\uff0c\u95ee\u9898\u5728\u4e8e\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u4e86\u76f8\u540c\u7684\u8d44\u6e90\u3002\u5982\uff0c\u540c \u2014\u5185\u5b58\u533a(\u53d8\u91cf\uff0c\u6570\u7ec4\uff0c\u6216\u5bf9 […]<\/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-10095","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10095","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=10095"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10095\/revisions"}],"predecessor-version":[{"id":10097,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10095\/revisions\/10097"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10095"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}