atile. Volatile keyword tells the compiler that a variable might be modified asynchronously by concurrently running thre…n creates the Singleton. Yet, this is not enough and the instance also needs to be marked volatile. Volatile keyword tells the compiler that a variable might be modified asynchronously by concurrently running threads.

Warning: A big difference between launch and async is how they handle exceptions. async expects that you will eventually call await to get a result (or exception) so it won’t throw exceptions by default. That means if you use async to start a new coroutine it will silently drop exceptions.

f supervisorSc…coroutine started by coroutineScope throws an exception, coroutineScope can throw it to the caller. Since we’re using coroutineScope instead of supervisorScope, it would also immediately cancel all other children when the exception is thrown.