prevent linux thread from being interrupted by scheduler

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How do you tell the thread scheduler in linux to not interrupt your thread for any reason?

Can’t really be done, you need a real time system for that. The closes thing you’ll get with linux is to
set the scheduling policy to a realtime scheduler, e.g. SCHED_FIFO, and also set the PTHREAD_EXPLICIT_SCHED attribute. See e.g. here , even now though, e.g. irq handlers and other other stuff will interrupt your thread and run.

However, if you only care about the threads in your own process not being able to do anything, then yes, having them block on a mutex your running thread holds is sufficient.

The hard part is to coordinate all the other threads to grab that mutex whenever your thread needs to do its thing.

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