mutex with read/write options

[abintrd]

We have a situation where we need to run six tasks which reads form same DB. One of this task is long running and none of other 5 tasks should run while the 1st one is running. Once the 1st task is complete then all 5 other tasks can start.

I see couple of options here.

1. Use a dag with dependencies
2. Use steps and when condition.

I was wondering if we could use mutex for implementing a better solution. With current implementation of mutex we can only say here is a mutex that is common for all 6 jobs. But the problem here is the 5 jobs should not stop each other. So, if there is a way to say release 5 jobs once the mutex is released by first job, that would be a more cleaner solution.