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How does mutex implement blocking when a lock is already acquired?
```scope.launch { 
    mutex.withLock { ... } 
}```
Here, does the mutex block the suspend the coroutine just like `delay()` (such that it doesn't block a thread's execution but just the coroutine) or a total thread block making essentially all coroutines (scheduled on that thread) blocked as well?

the coroutine is suspended until it is runnable again (e.g. when the lock is released elsewhere), it does not block the thread

<https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.sync/-mutex/lock.html>
&gt; Locks this mutex, *suspending* caller until the lock is acquired

<@UJQB4DJF7> Oh I see, thanks for clarifying!