ReentrantReadWriteLock:ReadLock和WriteLock有什么区别? [英] ReentrantReadWriteLock: what's the difference between ReadLock and WriteLock?

问题描述

我所知道的是:

• ReadLock 和 WriteLock 互相影响
• WriteLock就像 synchronized
• ReadLock似乎无法单独工作

• ReadLock and WriteLock affect each other somehow
• WriteLock is just like synchronized
• ReadLock seems cannot work alone

推荐答案

readLock.lock();

• 这意味着，如果有任何其他线程正在编写(即持有一个 写锁)，然后在此处停止，直到没有其他线程在写.
• 授予该锁后，将不允许其他任何线程写入 (即使用写锁)，直到释放该锁为止.

readLock.lock();

• This means that if any other thread is writing (i.e. holds a write lock) then stop here until no other thread is writing.
• Once the lock is granted no other thread will be allowed to write (i.e. take a write lock) until the lock is released.
• 这意味着，如果有任何其他线程正在阅读或写作，请停止 在这里，直到没有其他线程正在读取或写入.
• 授予锁定后，将不允许其他任何线程读取 或写(即获取读或写锁)，直到释放该锁为止.
• This means that if any other thread is reading or writing, stop here and wait until no other thread is reading or writing.
• Once the lock is granted, no other thread will be allowed to read or write (i.e. take a read or write lock) until the lock is released.

结合使用这些，您一次只能安排一个线程进行写访问，但是，除了一个线程正在写时，您可以同时阅读任意数量的阅读器.

Combining these you can arrange for only one thread at a time to have write access, but as many readers as you like can read at the same time except when a thread is writing.

另辟way径.每次您要从结构中读取时，请锁定读取.每次您要写入时，请进行写入锁定.这样一来，只要发生写操作，就不会有人在阅读(您可以想象您具有独占访问权)，但是只要没有人在写，就会有许多读者同时阅读.

Put another way. Every time you want to read from the structure, take a read lock. Every time you want to write, take a write lock. This way whenever a write happens no-one is reading (you can imagine you have exclusive access), but there can be many readers reading at the same time so long as no-one is writing.

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