From b52f37602968768901d2dd83ccf966d953a532f0 Mon Sep 17 00:00:00 2001 From: user Date: Fri, 17 Jul 2026 13:43:10 +0200 Subject: kernel: sys_sleep - a cooperative delay off the DIV timer (+ ping pacing) There was no time source at all (IRQ vectors just reti; scheduler is purely cooperative). The DIV register (FF04) free-runs at 16384 Hz regardless of interrupts, so sys_sleep accumulates DIV deltas across SchedYields (other procs keep running) until the requested number of 1/64-second units elapse. - SYS_SLEEP(34): B = 1/64s units; libc gsleep(units) / msleep(ms) wrappers. - ping now msleep(800) between echoes, so it paces like real ping instead of blasting all four at once. Verified real-time (capped emulator): replies land ~0.85s apart. In --uncapped runs the delay is GB-time (fast wall-clock), as expected. --- c/ping.c | 1 + 1 file changed, 1 insertion(+) (limited to 'c/ping.c') diff --git a/c/ping.c b/c/ping.c index c98f106..68c4c86 100644 --- a/c/ping.c +++ b/c/ping.c @@ -47,6 +47,7 @@ void main(void) { } else { puts(" seq="); putu(seq); puts(" timeout"); nl(); } + if (seq < 4) msleep(800); /* pace like real ping */ } puts("-- "); putu(got); puts("/4 received"); nl(); net_close(s); -- cgit v1.3.1-sl0p