posix-rt

To reduce real-time jitter, apply POSIX scheduling policies like SCHED_FIFO or SCHED_RR, lock memory with mlockall, and set CPU affinity to isolate the process. This ensures deterministic execution by preventing page faults and avoiding context switches to lower priority tasks.

Prevent priority inversion in pthreads by configuring mutexes with the POSIX priority inheritance protocol. This temporarily elevates a lower-priority thread holding the lock to the priority of the highest waiting thread, ensuring critical sections execute without unbounded delays.

Implement deterministic timing by creating POSIX timers based on CLOCK_MONOTONIC, which is unaffected by system clock adjustments. Configure the timer to deliver real-time signals periodically, ensuring your application receives precise interval notifications for hard real-time loops.

Yes, you can use PREEMPT_RT and cgroups together for real-time configuration. PREEMPT_RT makes the kernel fully preemptible to minimize latency, while cgroups manage CPU allocation and isolate workloads, ensuring dedicated processing time for real-time tasks.

Yes, io_uring and epoll are effective for low-latency IPC. Combine them with POSIX shared memory or message queues to achieve high-performance, non-blocking inter-process communication, allowing real-time processes to exchange data efficiently without polling overhead.

Use mlockall to lock all current and future process memory into RAM, preventing the operating system from paging memory to disk. In hard real-time applications, avoiding disk swap-ins eliminates unpredictable page fault latency, ensuring deterministic response times.