Background:

We have a clock process which needs to signal other non child processes[cpp code] on each clock tick. Each of the process lives in its on container (containerd).

Besides doing brute force of scanning a shared memory on a change(which is very bad in terms of computing resource). Any other effective ways for a near real-time system to send a signal for other processes?

Desired behavior:

1. Make all process to sleep for a time x or until they received a tick single from the main clock
2. The latency of each process should be small, less than a milisecond.

Questions:

Is it possible to wait_event_interruptible_timeout in the userspace. Will it help for the scenario above? Any other solution ?