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\n\u4e50\u89c2\u9501\uff1a
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\n\u4e50\u89c2\u9501\u7684\u5b9e\u73b0\u65b9\u5f0f\uff1a
\n1\u3001\u4f7f\u7528\u7248\u672c\u6807\u8bc6\u6765\u786e\u5b9a\u8bfb\u5230\u7684\u6570\u636e\u4e0e\u63d0\u4ea4\u65f6\u7684\u6570\u636e\u662f\u5426\u4e00\u81f4\u3002\u63d0\u4ea4\u540e\u4fee\u6539\u7248\u672c\u6807\u8bc6\uff0c\u4e0d\u4e00\u81f4\u65f6\u53ef\u4ee5\u91c7\u53d6\u4e22\u5f03\u548c\u518d\u6b21\u5c1d\u8bd5\u7684\u7b56\u7565\u3002
\n2\u3001 Java \u4e2d\u7684 Compare and Swap \u5373 CAS \uff0c\u5f53\u591a\u4e2a\u7ebf\u7a0b\u5c1d\u8bd5\u4f7f\u7528 CAS\u540c\u65f6\u66f4\u65b0\u540c\u4e00\u4e2a\u53d8\u91cf\u65f6\uff0c\u53ea\u6709\u5176\u4e2d\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u66f4\u65b0\u53d8\u91cf\u7684\u503c\uff0c\u800c\u5176\u5b83\u7ebf\u7a0b\u90fd\u5931\u8d25\uff0c\u5931\u8d25\u7684\u7ebf\u7a0b\u5e76\u4e0d\u4f1a\u88ab\u6302\u8d77,\u800c\u662f\u88ab\u544a\u77e5\u8fd9\u6b21\u7ade\u4e89\u4e2d\u5931\u8d25,\u5e76\u53ef\u4ee5\u518d\u6b21\u5c1d\u8bd5\u3002 CAS\u64cd\u4f5c\u4e2d\u5305\u542b\u4e09\u4e2a\u64cd\u4f5c\u6570\u2014\u2014\u9700\u8981\u8bfb\u5199\u7684\u5185\u5b58\u4f4d\u7f6e\uff08V\uff09\u3001\u8fdb\u884c\u6bd4\u8f83\u7684\u9884\u671f\u539f\u503c\uff08A\uff09\u548c\u62df\u5199\u5165\u7684\u65b0\u503c(B)\u3002\u5982\u679c\u5185\u5b58\u4f4d\u7f6e V \u7684\u503c\u4e0e\u9884\u671f\u539f\u503cA\u76f8\u5339\u914d\uff0c\u90a3\u4e48\u5904\u7406\u5668\u4f1a\u81ea\u52a8\u5c06\u8be5\u4f4d\u7f6e\u503c\u66f4\u65b0\u4e3a\u65b0\u503c B\u3002\u5426\u5219\u5904\u7406\u5668\u4e0d\u505a\u4efb\u4f55\u64cd\u4f5c\u3002
\nCAS \u7f3a\u70b9:
\n1\u3001 ABA \u95ee\u9898\uff1a
\n\u6bd4\u5982\u8bf4\u4e00\u4e2a\u7ebf\u7a0b one \u4ece\u5185\u5b58\u4f4d\u7f6e V \u4e2d\u53d6\u51fa A\uff0c\u8fd9\u65f6\u5019\u53e6\u4e00\u4e2a\u7ebf\u7a0b two \u4e5f\u4ece\u5185\u5b58\u4e2d\u53d6\u51fa A\uff0c\u5e76\u4e14 two \u8fdb\u884c\u4e86\u4e00\u4e9b\u64cd\u4f5c\u53d8\u6210\u4e86 B\uff0c\u7136\u540e two \u53c8\u5c06V \u4f4d\u7f6e\u7684\u6570\u636e\u53d8\u6210 A\uff0c\u8fd9\u65f6\u5019\u7ebf\u7a0b one \u8fdb\u884c CAS \u64cd\u4f5c\u53d1\u73b0\u5185\u5b58\u4e2d\u4ecd\u7136\u662f A\uff0c\u7136\u540e one \u64cd\u4f5c\u6210\u529f\u3002\u5c3d\u7ba1\u7ebf\u7a0b one \u7684 CAS \u64cd\u4f5c\u6210\u529f\uff0c\u4f46\u53ef\u80fd\u5b58\u5728\u6f5c\u85cf\u7684\u95ee\u9898\u3002\u4ece Javal. 5 \u5f00\u59cb JDK\u7684 atomic \u5305\u91cc\u63d0\u4f9b\u4e86\u4e00\u4e2a\u7c7b AtomicStampedReference \u6765\u89e3\u51b3 ABA \u95ee\u9898\u3002
\n2\u3001\u5faa\u73af\u65f6\u95f4\u957f\u5f00\u9500\u5927\uff1a
\n\u5bf9\u4e8e\u8d44\u6e90\u7ade\u4e89\u4e25\u91cd\uff08\u7ebf\u7a0b\u51b2\u7a81\u4e25\u91cd\uff09\u7684\u60c5\u51b5\uff0cCAS \u81ea\u65cb\u7684\u6982\u7387\u4f1a\u6bd4\u8f83\u5927\uff0c\u4ece\u800c\u6d6a\u8d39\u66f4\u591a\u7684 CPU \u8d44\u6e90\uff0c\u6548\u7387\u4f4e\u4e8esynchronized\u3002
\n3\u3001\u53ea\u80fd\u4fdd\u8bc1\u4e00\u4e2a\u5171\u4eab\u53d8\u91cf\u7684\u539f\u5b50\u64cd\u4f5c\uff1a
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