ReentrantReadWriteLock读写锁的使用2 - c++编程基础

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ReentrantReadWriteLock读写锁的使用2(二)

2015-07-20 17:23:50 来源: 作者: 【大中小】浏览:4次

try { // Recheck state because another thread might have // acquired write lock and changed state before we did. if (!cacheva lid) { data = ... cacheva lid = true; } // Downgrade by acquiring read lock before releasing write lock rwl.readLock().lock(); } finally { rwl.writeLock().unlock(); // Unlock write, still hold read } } try { use(data); } finally { rwl.readLock().unlock(); } } }
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