Add into_mutex_reference for MutexGuard #3741
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Motivation
In order to build a condition variable (#2739) in tokio there needs to be a way to release the lock and get a reference to the underlying Mutex.
One way to do this would be to pass both the MutexGuard and a reference to the Mutex to
Condvar::wait
but that would differ from the API instd:sync
.Solution
This pull request adds a single function
MutexGuard::into_mutex_reference
(suggestions for a better name are welcome). The method consumes theMutexGuard
object, releases the underlying lock and returns a reference to theMutex
.