How can I use the same lock in both suspending and...

# coroutines

[mcpiroman]

How can I use the same lock in both suspending and blocking code?
`Mutex`seems to be only usable in suspend functions and `synchronized()`only in non-suspend.

[Nick Allen]

Coroutines themselves are multi-threaded and have to do synchronization. They tend to spin wait for synchronization using atomic.loop from kotlinx.atomicfu.

If the synchronized block is used for very fine grained synchronization such that blocking is insignificant if it even does happen, then I see no issue with using that from a coroutine. Don't suspend inside the block.

You can use runBlocking to run coroutines (like Mutex) from a non-suspending context. Only use this from places where blocking is expected and do not call if the code is running on a dispatcher so don't use runBlocking from <http://Dispatchers.IO|Dispatchers.IO>. Avoid this if you can.