How can I use a Condvar with a RwLock?

Question

I have several threads waiting on the same Condvar associated with data wrapped inside a RwLock . I'd like to call Condvar::wait and check a condition after holding the write lock to the data, but it seems Condvar::wait only accepts MutexGuard as an argument. Since there are many other parts that use this data as a read-only variable, I can't simply replace RwLock with Mutex .

How should I use Condvar together with RwLock -wrapped data?

Answer 1

见https://github.com/Amanieu/parking_lot/issues/165用于使用的示例CondVar用RwLockGuard 。