CODEWITHSUNDEEP
kotlingetter-setterkotlin-coroutines
AndrewBloom
AndrewBloom

Reputation: 2408

how to write getter and setter containing mutex.withLock in kotlin

I'd like to have a synchronised access to a variable that represents my state from coroutines. How can I fix this?

private var myState: MyState? = null
    get() = mutex.withLock {
        return@withLock myState
    }
    set(value) = mutex.withLock {
        field = value
    }
private val mutex = Mutex()

right now I get Suspend function 'withLock' should be called only from a coroutine or another suspend function message. If not possible any alternative elegant solutions?

Upvotes: 2

Views: 1390

Answers (1)

Dominic Fischer
Dominic Fischer

Reputation: 1849

To call suspend function in a non-suspending context. You can use runBlocking.

private var myState: MyState? = null
    get() {
        return runBlocking {
            mutex.withLock {
                myState
            }
        }
    }
    set(value) {
        runBlocking {
            mutex.withLock {
                field = value
            }
        }
    }
private val mutex = Mutex()

NOTES:

You might be better off changing the property to two suspend functions (getter/setter), instead of using runBlocking. All depends on the context in which you call myState.

You also want to consider voting for KT-15555.

Upvotes: 2

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