{"id":54090,"date":"2025-08-12T22:19:45","date_gmt":"2025-08-12T14:19:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/54090.html"},"modified":"2025-08-12T22:19:45","modified_gmt":"2025-08-12T14:19:45","slug":"%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e5%8e%9f%e7%90%86%e4%b8%8e%e5%ae%9e%e6%88%98%ef%bc%88%e4%ba%8c%e5%8d%81%e4%ba%8c%ef%bc%89%e6%b7%b1%e5%85%a5%e9%94%81%e7%9a%84%e6%bc%94%e8%bf%9b%ef%bc%8c%e4%b8%ba","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/54090.html","title":{"rendered":"\u5e76\u53d1\u7f16\u7a0b\u539f\u7406\u4e0e\u5b9e\u6218\uff08\u4e8c\u5341\u4e8c\uff09\u6df1\u5165\u9501\u7684\u6f14\u8fdb\uff0c\u4e3a\u4ec0\u4e48\u6709\u4e86ReadWriteLock\u8fd8\u9700\u8981StampedLock\uff1f"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u6211\u4eec\u5b66\u4e60\u4e86\u8bfb\u5199\u9501\u7684\u76f8\u5173\u77e5\u8bc6，\u8bfb\u5199\u9501\u9002\u5408\u5728\u8bfb\u591a\u5199\u5c11\u7684\u573a\u666f\u4e2d\u4f7f\u7528，\u90a3\u4e48\u8fd9\u53ef\u80fd\u4f1a\u51fa\u73b0\u5199\u9501\u9965\u997f\u7684\u60c5\u51b5\u3002\u5f53\u8bfb\u64cd\u4f5c\u975e\u5e38\u9891\u7e41\u65f6，\u8bfb\u9501\u53ef\u80fd\u88ab\u5927\u91cf\u7ebf\u7a0b\u6301\u7eed\u6301\u6709，\u5199\u9501\u8981\u83b7\u53d6，\u5fc5\u987b\u5148\u7b49\u5f85\u6240\u6709\u5f53\u524d\u7684\u8bfb\u9501\u91ca\u653e，\u5e76\u4e14\u5728\u5b83\u5c1d\u8bd5\u83b7\u53d6\u671f\u95f4，\u65b0\u7684\u8bfb\u9501\u8bf7\u6c42\u4e5f\u4f1a\u56e0\u4e3a\u201c\u8bfb\u5199\u4e92\u65a5\u201d\u800c\u88ab\u963b\u585e；\u5982\u679c\u5df2\u6709\u8bfb\u9501\u4e0d\u65ad\u91ca\u653e\u53c8\u6709\u65b0\u8bfb\u9501\u4e0d\u65ad\u83b7\u53d6，\u5199\u9501\u53ef\u80fd\u957f\u65f6\u95f4\u751a\u81f3\u6c38\u8fdc\u65e0\u6cd5\u83b7\u5f97\u6267\u884c\u673a\u4f1a，\u4ece\u800c\u5bfc\u81f4\u7b49\u5f85\u7684\u5199\u7ebf\u7a0b\u51fa\u73b0\u9965\u997f\u3002\u8fd9\u662f\u8bfb\u5199\u9501\u56fa\u6709\u7684\u7f3a\u70b9\u3002<\/p>\n

\u4e3a\u4e86\u89e3\u51b3\u8bfb\u5199\u9501\u7684\u8fd9\u4e00\u95ee\u9898，Java 8 \u5f15\u5165\u4e86\u90ae\u6233\u9501 StampedLock，\u6838\u5fc3\u6539\u8fdb\u5728\u4e8e\u5f15\u5165\u4e86\u200c\u4e50\u89c2\u8bfb\u200c\u673a\u5236，\u6539\u5584\u8bfb\u5199\u9501\u8bfb\u5199\u4e92\u65a5\u5bfc\u81f4\u7684\u200c\u5199\u9501\u9965\u997f\u200c \u95ee\u9898\u3002\u672c\u6765\u5c31\u6765\u5b66\u4e60StampedLock\u7684\u76f8\u5173\u77e5\u8bc6\u3002<\/p>\n

StampedLock\u7684\u4e09\u79cd\u6a21\u5f0f<\/h2>\n

\/**
\n * A capability-based lock with three modes for controlling read\/write
\n * access. The state of a StampedLock consists of a version and mode.
\n * Lock acquisition methods return a stamp that represents and
\n * controls access with respect to a lock state; "try" versions of
\n * these methods may instead return the special value zero to
\n * represent failure to acquire access. Lock release and conversion
\n * methods require stamps as arguments, and fail if they do not match
\n * the state of the lock. The three modes are:
\n *\/<\/span><\/p>\n

\u4e00\u79cd\u57fa\u4e8e\u80fd\u529b\u7684\u9501，\u63d0\u4f9b\u4e09\u79cd\u6a21\u5f0f\u6765\u63a7\u5236\u8bfb\/\u5199\u8bbf\u95ee\u3002StampedLock \u7684\u72b6\u6001\u7531\u7248\u672c\u53f7\u548c\u6a21\u5f0f\u7ec4\u6210\u3002\u9501\u83b7\u53d6\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u90ae\u6233（stamp），\u7528\u4e8e\u8868\u793a\u548c\u63a7\u5236\u5bf9\u9501\u72b6\u6001\u7684\u8bbf\u95ee；\u8fd9\u4e9b\u65b9\u6cd5\u7684 \u201ctry\u201d \u7248\u672c\u53ef\u80fd\u8fd4\u56de\u7279\u6b8a\u503c\u96f6\u6765\u8868\u793a\u83b7\u53d6\u8bbf\u95ee\u5931\u8d25\u3002\u9501\u91ca\u653e\u548c\u8f6c\u6362\u65b9\u6cd5\u9700\u8981\u90ae\u6233\u4f5c\u4e3a\u53c2\u6570，\u5982\u679c\u90ae\u6233\u4e0e\u9501\u72b6\u6001\u4e0d\u5339\u914d\u5219\u4f1a\u5931\u8d25\u3002\u4e09\u79cd\u6a21\u5f0f\u5982\u4e0b：<\/p>\n

\/* <li><b>Writing.<\/b> Method {@link #writeLock} possibly blocks
\n * waiting for exclusive access, returning a stamp that can be used
\n * in method {@link #unlockWrite} to release the lock. Untimed and
\n * timed versions of {@code tryWriteLock} are also provided. When
\n * the lock is held in write mode, no read locks may be obtained,
\n * and all optimistic read validations will fail.
\n *\/<\/span><\/p>\n

\u5199\u6a21\u5f0f（Writing）<\/h3>\n

\u65b9\u6cd5writeLock\u53ef\u80fd\u963b\u585e\u7b49\u5f85\u72ec\u5360\u8bbf\u95ee，\u8fd4\u56de\u4e00\u4e2a\u90ae\u6233，\u8be5\u90ae\u6233\u53ef\u5728\u65b9\u6cd5unlockWrite\u4e2d\u7528\u4e8e\u91ca\u653e\u9501\u3002\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86tryWriteLock\u7684\u975e\u8d85\u65f6\u548c\u8d85\u65f6\u7248\u672c\u3002\u5f53\u9501\u5904\u4e8e\u5199\u6a21\u5f0f\u65f6，\u65e0\u6cd5\u83b7\u53d6\u8bfb\u9501，\u5e76\u4e14\u6240\u6709\u4e50\u89c2\u8bfb\u9a8c\u8bc1\u90fd\u5c06\u5931\u8d25\u3002<\/p>\n

\/*
\n * <li><b>Reading.<\/b> Method {@link #readLock} possibly blocks
\n * waiting for non-exclusive access, returning a stamp that can be
\n * used in method {@link #unlockRead} to release the lock. Untimed
\n * and timed versions of {@code tryReadLock} are also provided.
\n *\/<\/span><\/p>\n

\u8bfb\u6a21\u5f0f（Reading）<\/h3>\n

\u65b9\u6cd5readLock\u53ef\u80fd\u963b\u585e\u7b49\u5f85\u975e\u72ec\u5360\u8bbf\u95ee，\u8fd4\u56de\u4e00\u4e2a\u90ae\u6233，\u8be5\u90ae\u6233\u53ef\u5728\u65b9\u6cd5unlockRead \u4e2d\u7528\u4e8e\u91ca\u653e\u9501\u3002\u540c\u65f6\u4e5f\u63d0\u4f9b\u4e86tryReadLock\u7684\u975e\u8d85\u65f6\u548c\u8d85\u65f6\u7248\u672c\u3002<\/p>\n

\/*
\n * <li><b>Optimistic Reading.<\/b> Method {@link #tryOptimisticRead}
\n * returns a non-zero stamp only if the lock is not currently held in
\n * write mode. Method {@link #validate} returns true if the lock has not
\n * been acquired in write mode since obtaining a given stamp, in which
\n * case all actions prior to the most recent write lock release
\n * happen-before actions following the call to {@code tryOptimisticRead}.
\n * This mode can be thought of as an extremely weak version of a
\n * read-lock, that can be broken by a writer at any time. The use of
\n * optimistic read mode for short read-only code segments often reduces
\n * contention and improves throughput. However, its use is inherently
\n * fragile. Optimistic read sections should only read fields and hold
\n * them in local variables for later use after validation. Fields read
\n * while in optimistic read mode may be wildly inconsistent, so usage
\n * applies only when you are familiar enough with data representations to
\n * check consistency and\/or repeatedly invoke method {@code validate()}.
\n * For example, such steps are typically required when first reading an
\n * object or array reference, and then accessing one of its fields,
\n * elements or methods.
\n *\/<\/span><\/p>\n

\u4e50\u89c2\u8bfb\u6a21\u5f0f（Optimistic Reading）<\/h3>\n

\u65b9\u6cd5 tryOptimisticRead\u4ec5\u5f53\u9501\u5f53\u524d\u672a\u88ab\u5199\u6a21\u5f0f\u6301\u6709\u65f6\u8fd4\u56de\u4e00\u4e2a\u975e\u96f6\u90ae\u6233\u3002\u65b9\u6cd5validate \u5982\u679c\u5728\u83b7\u53d6\u7ed9\u5b9a\u90ae\u6233\u4ee5\u6765\u9501\u672a\u88ab\u5199\u6a21\u5f0f\u83b7\u53d6\u8fc7\u5219\u8fd4\u56de true，\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b，\u6700\u8fd1\u4e00\u6b21\u5199\u9501\u91ca\u653e\u4e4b\u524d\u53d1\u751f\u7684\u6240\u6709\u64cd\u4f5c happen-before（\u5148\u884c\u53d1\u751f\u4e8e）\u8c03\u7528tryOptimisticRead \u4e4b\u540e\u7684\u64cd\u4f5c\u3002\u6b64\u6a21\u5f0f\u53ef\u89c6\u4e3a\u4e00\u79cd\u6781\u5176\u8106\u5f31\u7684\u8bfb\u9501\u5f62\u5f0f，\u968f\u65f6\u53ef\u80fd\u88ab\u5199\u7ebf\u7a0b\u4e2d\u65ad\u3002\u5728\u77ed\u6682\u7684\u53ea\u8bfb\u4ee3\u7801\u6bb5\u4e2d\u4f7f\u7528\u4e50\u89c2\u8bfb\u6a21\u5f0f\u901a\u5e38\u53ef\u4ee5\u51cf\u5c11\u4e89\u7528\u5e76\u63d0\u9ad8\u541e\u5410\u91cf\u3002\u7136\u800c，\u5176\u4f7f\u7528\u672c\u8d28\u4e0a\u5177\u6709\u8106\u5f31\u6027\u3002\u4e50\u89c2\u8bfb\u4ee3\u7801\u6bb5\u5e94\u4ec5\u8bfb\u53d6\u5b57\u6bb5\u5e76\u5c06\u5176\u4fdd\u5b58\u5728\u5c40\u90e8\u53d8\u91cf\u4e2d，\u4ee5\u4fbf\u5728\u9a8c\u8bc1\u540e\u4f7f\u7528\u3002 \u5728\u4e50\u89c2\u8bfb\u6a21\u5f0f\u4e0b\u8bfb\u53d6\u7684\u5b57\u6bb5\u53ef\u80fd\u6781\u4e0d\u4e00\u81f4，\u56e0\u6b64\u4ec5\u9002\u7528\u4e8e\u719f\u6089\u6570\u636e\u8868\u793a\u6cd5\u5e76\u80fd\u68c0\u67e5\u4e00\u81f4\u6027\u548c\/\u6216\u91cd\u590d\u8c03\u7528validate() \u65b9\u6cd5\u7684\u60c5\u51b5\u3002\u4f8b\u5982，\u5728\u9996\u6b21\u8bfb\u53d6\u5bf9\u8c61\u6216\u6570\u7ec4\u5f15\u7528，\u7136\u540e\u8bbf\u95ee\u5176\u5b57\u6bb5\u3001\u5143\u7d20\u6216\u65b9\u6cd5\u65f6，\u901a\u5e38\u9700\u8981\u6267\u884c\u6b64\u7c7b\u6b65\u9aa4\u3002<\/p>\n

\u5907\u6ce8：\u6240\u8c13\u7684\u4e50\u89c2\u8bfb\u5c31\u662f\u4e50\u89c2\u7684\u8ba4\u4e3a\u4e0d\u4f1a\u6709\u5199\u7684\u53d1\u751f，\u6240\u4ee5\u8bfb\u64cd\u4f5c\u65e0\u9700\u52a0\u9501\u5373\u53ef\u6267\u884c\u3002\u53cd\u8fc7\u6765，\u60b2\u89c2\u8bfb\u5373\u60b2\u89c2\u7684\u8ba4\u4e3a\u80af\u5b9a\u6709\u5199\u53d1\u751f，\u6240\u4ee5\u8bfb\u64cd\u4f5c\u5fc5\u987b\u52a0\u9501\u963b\u585e\u5199\u9501\u7684\u83b7\u53d6，\u963b\u6b62\u5199\u64cd\u4f5c\u8bbf\u95ee\u6570\u636e，\u786e\u4fdd\u6570\u636e\u5f3a\u4e00\u81f4\u6027\u3002<\/p>\n

\u8bfb\u5199\u6a21\u5f0f\u8f6c\u6362<\/h2>\n

\/* <p>This class also supports methods that conditionally provide
\n * conversions across the three modes. For example, method {@link
\n * #tryConvertToWriteLock} attempts to "upgrade" a mode, returning
\n * a valid write stamp if (1) already in writing mode (2) in reading
\n * mode and there are no other readers or (3) in optimistic read mode
\n * and the lock is available. The forms of these methods are designed to
\n * help reduce some of the code bloat that otherwise occurs in
\n * retry-based designs.
\n *\/<\/span><\/p>\n

\u8be5\u7c7b\u8fd8\u652f\u6301\u5728\u4e09\u79cd\u6a21\u5f0f\u95f4\u8fdb\u884c\u6761\u4ef6\u6027\u8f6c\u6362\u7684\u65b9\u6cd5\u3002\u4f8b\u5982，\u65b9\u6cd5 tryConvertToWriteLock \u5c1d\u8bd5\u5c06\u5f53\u524d\u6a21\u5f0f"\u5347\u7ea7"\u4e3a\u5199\u6a21\u5f0f，\u5728\u4ee5\u4e0b\u60c5\u51b5\u4f1a\u8fd4\u56de\u6709\u6548\u7684\u5199\u90ae\u6233：<\/p>\n

(1) \u5f53\u524d\u5df2\u5904\u4e8e\u5199\u6a21\u5f0f；<\/p>\n

(2) \u5904\u4e8e\u8bfb\u6a21\u5f0f\u4e14\u65e0\u5176\u4ed6\u8bfb\u7ebf\u7a0b\u6301\u6709\u9501；<\/p>\n

(3) \u5904\u4e8e\u4e50\u89c2\u8bfb\u6a21\u5f0f\u4e14\u9501\u53ef\u7528\u3002<\/p>\n

\u6b64\u7c7b\u65b9\u6cd5\u7684\u8bbe\u8ba1\u65e8\u5728\u51cf\u5c11\u57fa\u4e8e\u91cd\u8bd5\u7684\u8bbe\u8ba1\u4e2d\u53ef\u80fd\u51fa\u73b0\u7684\u4ee3\u7801\u5197\u4f59\u3002<\/p>\n

StampedLock\u7684\u7279\u6027<\/h2>\n

\/* <p>StampedLocks are designed for use as internal utilities in the
\n * development of thread-safe components. Their use relies on
\n * knowledge of the internal properties of the data, objects, and
\n * methods they are protecting. They are not reentrant, so locked
\n * bodies should not call other unknown methods that may try to
\n * re-acquire locks (although you may pass a stamp to other methods
\n * that can use or convert it). The use of read lock modes relies on
\n * the associated code sections being side-effect-free. Unvalidated
\n * optimistic read sections cannot call methods that are not known to
\n * tolerate potential inconsistencies. Stamps use finite
\n * representations, and are not cryptographically secure (i.e., a
\n * valid stamp may be guessable). Stamp values may recycle after (no
\n * sooner than) one year of continuous operation. A stamp held without
\n * use or validation for longer than this period may fail to validate
\n * correctly. StampedLocks are serializable, but always deserialize
\n * into initial unlocked state, so they are not useful for remote
\n * locking.
\n *\/<\/span><\/p>\n

StampedLock \u8bbe\u8ba1\u7528\u4f5c\u5f00\u53d1\u7ebf\u7a0b\u5b89\u5168\u7ec4\u4ef6\u7684\u5185\u90e8\u5de5\u5177\u3002\u5176\u4f7f\u7528\u4f9d\u8d56\u4e8e\u5bf9\u53d7\u4fdd\u62a4\u6570\u636e\u3001\u5bf9\u8c61\u548c\u65b9\u6cd5\u5185\u90e8\u7279\u6027\u7684\u8ba4\u77e5\u3002\u9700\u8981\u6ce8\u610f\u7684\u5173\u952e\u9650\u5236\u5305\u62ec：<\/p>\n

\u4e0d\u53ef\u91cd\u5165<\/b>：\u9501\u5b9a\u4ee3\u7801\u5757\u5185\u4e0d\u5e94\u8c03\u7528\u53ef\u80fd\u5c1d\u8bd5\u91cd\u65b0\u83b7\u53d6\u9501\u7684\u5176\u4ed6\u672a\u77e5\u65b9\u6cd5（\u4f46\u53ef\u5c06\u90ae\u6233\u4f20\u9012\u7ed9\u80fd\u4f7f\u7528\u6216\u8f6c\u6362\u5b83\u7684\u5176\u4ed6\u65b9\u6cd5）\u3002<\/p>\n

\u8bfb\u6a21\u5f0f\u8981\u6c42<\/b>：\u4f7f\u7528\u8bfb\u9501\u6a21\u5f0f\u8981\u6c42\u5173\u8054\u4ee3\u7801\u6bb5\u65e0\u526f\u4f5c\u7528\u3002<\/p>\n

\u4e50\u89c2\u8bfb\u9650\u5236<\/b>：\u672a\u7ecf\u9a8c\u8bc1\u7684\u4e50\u89c2\u8bfb\u4ee3\u7801\u6bb5\u7981\u6b62\u8c03\u7528\u65e0\u6cd5\u5bb9\u5fcd\u6f5c\u5728\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u65b9\u6cd5\u3002<\/p>\n

\u90ae\u6233\u7279\u6027<\/b>：\u90ae\u6233\u4f7f\u7528\u6709\u9650\u4f4d\u6570\u8868\u793a，\u4e0d\u5177\u5907\u52a0\u5bc6\u5b89\u5168\u6027（\u6709\u6548\u90ae\u6233\u53ef\u80fd\u88ab\u731c\u6d4b）\u3002\u90ae\u6233\u6570\u503c\u5728\u8fde\u7eed\u8fd0\u884c\u4e00\u5e74\u540e（\u6700\u65e9\u4e00\u5e74\u540e）\u53ef\u80fd\u590d\u7528\u3002\u8d85\u8fc7\u8be5\u671f\u9650\u672a\u4f7f\u7528\u6216\u9a8c\u8bc1\u7684\u90ae\u6233\u53ef\u80fd\u9a8c\u8bc1\u5931\u8d25\u3002<\/p>\n

\u5e8f\u5217\u5316\u884c\u4e3a<\/b>：\u652f\u6301\u5e8f\u5217\u5316，\u4f46\u53cd\u5e8f\u5217\u5316\u540e\u59cb\u7ec8\u5904\u4e8e\u521d\u59cb\u672a\u9501\u5b9a\u72b6\u6001，\u56e0\u6b64\u4e0d\u9002\u7528\u4e8e\u8fdc\u7a0b\u9501\u573a\u666f\u3002<\/p>\n

\/* <p>Like {@link java.util.concurrent.Semaphore Semaphore}, but unlike most
\n * {@link Lock} implementations, StampedLocks have no notion of ownership.
\n * Locks acquired in one thread can be released or converted in another.<\/p>\n

* <p>The scheduling policy of StampedLock does not consistently
\n * prefer readers over writers or vice versa. All "try" methods are
\n * best-effort and do not necessarily conform to any scheduling or
\n * fairness policy. A zero return from any "try" method for acquiring
\n * or converting locks does not carry any information about the state
\n * of the lock; a subsequent invocation may succeed.
\n *
\n *\/<\/span><\/p>\n

\u4e0d\u5177\u5907\u9501\u6240\u6709\u6743<\/b>：\u4e0e java.util.concurrent.Semaphore \u7c7b\u4f3c，\u4f46\u4e0d\u540c\u4e8e\u5927\u591a\u6570Lock\u5b9e\u73b0，StampedLock\u4e0d\u5177\u5907\u6240\u6709\u6743\u6982\u5ff5\u3002\u5728\u67d0\u4e2a\u7ebf\u7a0b\u4e2d\u83b7\u53d6\u7684\u9501\u53ef\u5728\u53e6\u4e00\u7ebf\u7a0b\u4e2d\u91ca\u653e\u6216\u8f6c\u6362\u3002StampedLock \u7684\u8c03\u5ea6\u7b56\u7565\u4e0d\u4f1a\u6052\u5b9a\u5730\u4f18\u5148\u5904\u7406\u8bfb\u7ebf\u7a0b\u6216\u5199\u7ebf\u7a0b\u3002\u6240\u6709 \u201ctry\u201d \u5f00\u5934\u7684\u9501\u83b7\u53d6\/\u8f6c\u6362\u65b9\u6cd5 \u5747\u4e3a\u5c3d\u529b\u800c\u4e3a（best-effort）\u673a\u5236，\u4e0d\u4fdd\u8bc1\u9075\u5faa\u7279\u5b9a\u8c03\u5ea6\u6216\u516c\u5e73\u6027\u7b56\u7565\u3002\u8fd9\u4e9b \u201ctry\u201d \u65b9\u6cd5\u8fd4\u56de\u96f6\u503c\u4ec5\u8868\u793a\u64cd\u4f5c\u5931\u8d25，\u4e0d\u4f20\u9012\u4efb\u4f55\u9501\u72b6\u6001\u4fe1\u606f，\u540e\u7eed\u91cd\u8bd5\u8c03\u7528\u4ecd\u53ef\u80fd\u6210\u529f\u3002<\/p>\n

\/* <p>Because it supports coordinated usage across multiple lock
\n * modes, this class does not directly implement the {@link Lock} or
\n * {@link ReadWriteLock} interfaces. However, a StampedLock may be
\n * viewed {@link #asReadLock()}, {@link #asWriteLock()}, or {@link
\n * #asReadWriteLock()} in applications requiring only the associated
\n * set of functionality.
\n *\/<\/span><\/p>\n

\u975eLock\u63a5\u53e3\u5b9e\u73b0\u7c7b<\/b>：\u7531\u4e8e\u652f\u6301\u8de8\u591a\u9501\u6a21\u5f0f\u7684\u534f\u540c\u4f7f\u7528，\u6b64\u7c7b\u672a\u76f4\u63a5\u5b9e\u73b0Lock\u6216ReadWriteLock\u63a5\u53e3\u3002\u4f46\u5728\u4ec5\u9700\u90e8\u5206\u5173\u8054\u529f\u80fd\u7684\u573a\u666f\u4e2d，\u53ef\u901a\u8fc7\u89c6\u56fe\u65b9\u6cd5 asReadLock()\u3001asWriteLock()\u6216asReadWriteLock()\u5c06StampedLock \u8f6c\u6362\u4e3a\u76f8\u5e94\u9501\u7c7b\u578b\u3002<\/p>\n

StampedLock\u7684\u5185\u5b58\u540c\u6b65\u8bed\u4e49<\/h2>\n

\/* <p><b>Memory Synchronization.<\/b> Methods with the effect of
\n * successfully locking in any mode have the same memory
\n * synchronization effects as a <em>Lock<\/em> action, as described in
\n * Chapter 17 of <cite>The Java Language Specification<\/cite>.
\n * Methods successfully unlocking in write mode have the same memory
\n * synchronization effects as an <em>Unlock<\/em> action. In optimistic
\n * read usages, actions prior to the most recent write mode unlock action
\n * are guaranteed to happen-before those following a tryOptimisticRead
\n * only if a later validate returns true; otherwise there is no guarantee
\n * that the reads between tryOptimisticRead and validate obtain a
\n * consistent snapshot.
\n *\/<\/span><\/p>\n

\u4ee5\u4efb\u610f\u6a21\u5f0f\u6210\u529f\u9501\u5b9a（locking）\u7684\u65b9\u6cd5\u5177\u6709\u4e0e \u200c\u9501\u5b9a\u64cd\u4f5c\u200c（Lock action）\u76f8\u540c\u7684\u5185\u5b58\u540c\u6b65\u6548\u679c，\u5982\u300aJava\u8bed\u8a00\u89c4\u8303\u300b\u7b2c17\u7ae0\u6240\u8ff0\u3002\u4ee5\u5199\u6a21\u5f0f\u6210\u529f\u89e3\u9501（unlocking）\u7684\u65b9\u6cd5\u5219\u5177\u6709\u4e0e \u200c\u89e3\u9501\u64cd\u4f5c\u200c（Unlock action）\u76f8\u540c\u7684\u5185\u5b58\u540c\u6b65\u6548\u679c\u3002\u5728\u4e50\u89c2\u8bfb（optimistic read）\u573a\u666f\u4e2d，\u200c\u4ec5\u5f53\u540e\u7eed validate \u8fd4\u56de true \u65f6\u200c，\u6700\u8fd1\u4e00\u6b21\u5199\u6a21\u5f0f\u89e3\u9501\u64cd\u4f5c\u524d\u7684\u52a8\u4f5c\u624d\u4fdd\u8bc1 \u200chappen-before\u200c \u90a3\u4e9b\u4f4d\u4e8e tryOptimisticRead \u4e4b\u540e\u7684\u52a8\u4f5c；\u5426\u5219，\u65e0\u6cd5\u4fdd\u8bc1 tryOptimisticRead \u4e0e validate \u4e4b\u95f4\u7684\u8bfb\u53d6\u80fd\u83b7\u5f97\u4e00\u81f4\u6027\u5feb\u7167\u3002<\/p>\n

StampedLock\u6838\u5fc3API\u65b9\u6cd5<\/h2>\n

\u6700\u540e\u603b\u7ed3\u4e0bStampedLock\u6838\u5fc3API\u65b9\u6cd5：<\/p>\n\n\u9501\u6a21\u5f0f\u200c\u200c\u65b9\u6cd5\u540d\u200c\u200c\u8fd4\u56de\u503c\u200c\u200c\u529f\u80fd\u8bf4\u660e\u200c\u200c\u6ce8\u610f\u4e8b\u9879\u200c<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u200c\u5199\u9501\u200c<\/td>\nwriteLock()<\/td>\nlong stamp<\/td>\n\u83b7\u53d6\u72ec\u5360\u5199\u9501，\u963b\u585e\u76f4\u5230\u6210\u529f\u3002<\/td>\n\u5fc5\u987b\u901a\u8fc7 unlockWrite(stamp) \u91ca\u653e，\u5426\u5219\u5bfc\u81f4\u6b7b\u9501\u3002<\/td>\n<\/tr>\n
<\/td>\ntryWriteLock()<\/td>\nlong stamp（0\u5931\u8d25）<\/td>\n\u975e\u963b\u585e\u5c1d\u8bd5\u83b7\u53d6\u5199\u9501，\u5931\u8d25\u8fd4\u56de0\u3002<\/td>\n\u9002\u7528\u4e8e\u5feb\u901f\u5931\u8d25\u573a\u666f\u3002<\/td>\n<\/tr>\n
<\/td>\ntryWriteLock(time, unit)<\/td>\nlong stamp（0\u8d85\u65f6）<\/td>\n\u5b9a\u65f6\u5c1d\u8bd5\u83b7\u53d6\u5199\u9501，\u8d85\u65f6\u8fd4\u56de0\u3002<\/td>\n\u65f6\u95f4\u5355\u4f4d\u9700\u660e\u786e（\u5982 TimeUnit.SECONDS）\u3002<\/td>\n<\/tr>\n
<\/td>\nunlockWrite(stamp)<\/td>\nvoid<\/td>\n\u91ca\u653e\u5199\u9501，\u9700\u4f20\u5165\u83b7\u53d6\u65f6\u8fd4\u56de\u7684 stamp\u3002<\/td>\n\u4f20\u5165\u9519\u8bef stamp \u4f1a\u629b\u51fa\u5f02\u5e38\u3002<\/td>\n<\/tr>\n
\u200c\u60b2\u89c2\u8bfb\u9501\u200c<\/td>\nreadLock()<\/td>\nlong stamp<\/td>\n\u83b7\u53d6\u5171\u4eab\u8bfb\u9501，\u963b\u585e\u76f4\u5230\u6210\u529f\u3002<\/td>\n\u5fc5\u987b\u901a\u8fc7 unlockRead(stamp) \u91ca\u653e\u3002<\/td>\n<\/tr>\n
<\/td>\ntryReadLock()<\/td>\nlong stamp（0\u5931\u8d25）<\/td>\n\u975e\u963b\u585e\u5c1d\u8bd5\u83b7\u53d6\u8bfb\u9501，\u5931\u8d25\u8fd4\u56de0\u3002<\/td>\n\u4e0e\u5199\u9501\u4e92\u65a5，\u5931\u8d25\u65f6\u9700\u5904\u7406\u91cd\u8bd5\u6216\u964d\u7ea7\u3002<\/td>\n<\/tr>\n
<\/td>\ntryReadLock(time, unit)<\/td>\nlong stamp（0\u8d85\u65f6）<\/td>\n\u5b9a\u65f6\u5c1d\u8bd5\u83b7\u53d6\u8bfb\u9501，\u8d85\u65f6\u8fd4\u56de0\u3002<\/td>\n\u9002\u7528\u4e8e\u907f\u514d\u957f\u65f6\u95f4\u963b\u585e\u7684\u573a\u666f\u3002<\/td>\n<\/tr>\n
<\/td>\nunlockRead(stamp)<\/td>\nvoid<\/td>\n\u91ca\u653e\u8bfb\u9501，\u9700\u4f20\u5165\u83b7\u53d6\u65f6\u7684 stamp\u3002<\/td>\n\u5fc5\u987b\u4e0e\u83b7\u53d6\u9501\u7684 stamp \u5339\u914d\u3002<\/td>\n<\/tr>\n
\u200c\u4e50\u89c2\u8bfb\u200c<\/td>\ntryOptimisticRead()<\/td>\nlong stamp（0\u5931\u8d25）<\/td>\n\u5c1d\u8bd5\u4e50\u89c2\u8bfb，\u8fd4\u56de\u975e0 stamp \u8868\u793a\u5f53\u524d\u65e0\u5199\u9501\u3002<\/td>\n\u65e0\u9700\u663e\u5f0f\u91ca\u653e，\u4f46\u9700\u8c03\u7528 validate(stamp) \u9a8c\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u3002<\/td>\n<\/tr>\n
<\/td>\nvalidate(stamp)<\/td>\nboolean<\/td>\n\u68c0\u67e5\u4e50\u89c2\u8bfb\u671f\u95f4\u662f\u5426\u6709\u5199\u64cd\u4f5c（true \u8868\u793a\u6570\u636e\u6709\u6548）\u3002<\/td>\n\u82e5\u8fd4\u56de false，\u9700\u5347\u7ea7\u4e3a\u60b2\u89c2\u8bfb\u6216\u91cd\u8bd5\u3002<\/td>\n<\/tr>\n
\u200c\u9501\u8f6c\u6362\u200c<\/td>\ntryConvertToWriteLock(stamp)<\/td>\nlong（0\u5931\u8d25）<\/td>\n\u5c1d\u8bd5\u5c06\u8bfb\u9501\u5347\u7ea7\u4e3a\u5199\u9501，\u8fd4\u56de\u65b0 stamp \u62160\u3002<\/td>\n\u5347\u7ea7\u5931\u8d25\u9700\u624b\u52a8\u91ca\u653e\u539f\u9501\u5e76\u91cd\u65b0\u83b7\u53d6\u5199\u9501\u3002<\/td>\n<\/tr>\n
<\/td>\ntryConvertToReadLock(stamp)<\/td>\nlong（0\u5931\u8d25）<\/td>\n\u5c1d\u8bd5\u5c06\u5199\u9501\u964d\u7ea7\u4e3a\u8bfb\u9501，\u8fd4\u56de\u65b0 stamp \u62160\u3002<\/td>\n\u964d\u7ea7\u5931\u8d25\u9700\u91ca\u653e\u5199\u9501\u540e\u91cd\u65b0\u83b7\u53d6\u8bfb\u9501\u3002<\/td>\n<\/tr>\n
\u200c\u901a\u7528\u65b9\u6cd5\u200c<\/td>\nunlock(stamp)<\/td>\nvoid<\/td>\n\u901a\u7528\u91ca\u653e\u9501，\u81ea\u52a8\u8bc6\u522b\u9501\u7c7b\u578b（\u8bfb\/\u5199）\u3002<\/td>\n\u4ec5\u9002\u7528\u4e8e\u9501\u8f6c\u6362\u540e\u7684\u573a\u666f，\u76f4\u63a5\u66ff\u4ee3 unlockRead\/unlockWrite \u53ef\u80fd\u4e0d\u5b89\u5168\u3002<\/td>\n<\/tr>\n
<\/td>\nisWriteLocked()<\/td>\nboolean<\/td>\n\u68c0\u67e5\u5f53\u524d\u662f\u5426\u4e3a\u5199\u9501\u6a21\u5f0f\u3002<\/td>\n\u4e3b\u8981\u7528\u4e8e\u8c03\u8bd5\u548c\u76d1\u63a7\u3002<\/td>\n<\/tr>\n
<\/td>\nisReadLocked()<\/td>\nboolean<\/td>\n\u68c0\u67e5\u5f53\u524d\u662f\u5426\u4e3a\u8bfb\u9501\u6a21\u5f0f（\u60b2\u89c2\u8bfb）\u3002<\/td>\n\u4e0d\u53cd\u6620\u4e50\u89c2\u8bfb\u72b6\u6001\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

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