proc.testprocs

Two test processes for validating preemptive scheduling behaviour.

Overview

proc.testprocs creates two minimal preemptive processes, testproc1 and testproc2, that run indefinitely. Each process logs a short message to io.syslog once per second (approximately 1024 timer ticks at the 1024 Hz BDA tick rate), then yields to the scheduler and waits for the next interval.

The unit is included in the kernel build to demonstrate that the preemptive scheduler can context-switch between independent processes running at the same priority level.

Dependencies

• proc.types
• proc.mgr
• io.syslog
• arch.x86.bda

Functions and Procedures

init

procedure init;

Creates testproc1 and testproc2 via proc.mgr.create at priority 1, then logs a confirmation via io.syslog. Both processes start in psReady state and will be scheduled on the next timer interrupt.

program1 / program2 (internal)

procedure program1(ctx: PProcessContext);
procedure program2(ctx: PProcessContext);

Entry points for the two test processes. Each loops until ctx^.PendingMsg = smTerminate, logging a message and sleeping approximately one second via sleep_ticks(1024).

sleep_ticks (internal)

procedure sleep_ticks(ticks: uint16);

Busy-wait sleep using proc_yield and the BDA tick counter. Yields on each iteration and measures elapsed time as now - start, with correct handling of uint16 wrap-around at 65535.

Notes

These processes are not connected to any shell command or UI; they run silently in the background and can be observed via the PS command or the serial log. They respond to smTerminate by exiting the main loop and allowing the process to finish naturally.