Module sched 

The kernel’s deadline reservation on the calling thread (issue 2018).

The reservation is C, in the POSIX port (nros_posix_apply_current_deadline in nros-platform-posix), for the reason termination gives. It is reached only on a build that selected that port. A cfg(unix) gate is not enough: Zephyr native_sim, and the host tiers of ThreadX and FreeRTOS, target a Linux triple without the POSIX port. Their port defines no nros_posix_* symbol, so a reference made the linker take the POSIX platform.o from whichever archive carried one, and every other symbol in it then collided with the image’s own port (issue 2032; issue 1776 had the same shape).

Functions

apply_current_deadline^⚠

Ask the kernel to reserve budget_us every period_us for the calling thread. Returns true when the kernel took it, and false otherwise. That covers a tier class that asks for no reservation, a refusal (no CAP_SYS_NICE), and a build whose port has no such kernel facility. On false the caller enforces the budget itself.