safe Write
Execute the given lambda while holding the supplied ReentrantReadWriteLock's write lock. This is the correct alternative to the brokenwrite supplied by the Kotlin library, which non-atomically attempts to upgrade a read lock into a write lock by first dropping all extant holds of the read lock (!).
Receiver
The ReentrantReadWriteLock.
Return
The result of evaluating the supplied lambda.
Author
Todd L Smith
Parameters
lambda
The action to perform while holding the write lock.