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//! Sensei - Kata scheduler
const cpu = @import("../../asm/cpu.zig");
const pool = @import("../pool.zig");
const queue = @import("queue.zig");
const serial = @import("../../drivers/serial/serial.zig");
const shift = @import("../shift.zig");
const types = @import("../types.zig");
const waker = @import("waker.zig");
var current: ?*types.Kata = null;
var min_vruntime: u64 = 0;
var tick_count: u64 = 0;
const TICK_NS: u64 = 1_000_000;
pub fn on_tick() void {
tick_count += 1;
}
pub fn get_tick_count() u64 {
return tick_count;
}
pub fn schedule() void {
waker.wake_all_waiting();
if (current) |kata| {
const elapsed = tick_count - kata.last_run;
if (elapsed > 0) {
const delta = (TICK_NS * 1024 * elapsed) / kata.weight;
kata.vruntime += delta;
kata.last_run = tick_count;
}
}
const next = pick_next();
if (next == null and current == null) {
halt_loop();
}
if (next == current and next != null) {
queue.dequeue(next.?);
next.?.state = .Flowing;
return;
}
if (current) |curr| {
if (curr.state == .Flowing) {
curr.state = .Alive;
queue.enqueue(curr);
}
}
if (next) |n| {
queue.dequeue(n);
n.state = .Flowing;
n.last_run = tick_count;
current = n;
shift.to_kata(n);
unreachable;
}
clear_current();
halt_loop();
}
pub fn enqueue_kata(kata: *types.Kata) void {
queue.enqueue(kata);
}
pub fn dequeue_kata(kata: *types.Kata) void {
queue.dequeue(kata);
}
pub fn is_in_queue(kata: *types.Kata) bool {
return queue.is_queued(kata);
}
pub fn get_current_kata() ?*types.Kata {
return current;
}
pub fn clear_current_kata() void {
current = null;
}
pub fn wake_waiting_katas(target_id: u32) void {
waker.wake_waiting(target_id);
}
pub fn wake_one_blocked_kata() void {
waker.wake_one_blocked();
}
pub fn wake_kata(kata_id: u32) void {
waker.wake(kata_id);
}
fn pick_next() ?*types.Kata {
var curr = queue.get_head();
var local_min: u64 = 0xFFFFFFFFFFFFFFFF;
var chosen: ?*types.Kata = null;
var fallback: ?*types.Kata = null;
while (curr) |kata| {
if (kata.state == .Alive and kata.vruntime < local_min) {
local_min = kata.vruntime;
chosen = kata;
}
if (kata.state == .Flowing) {
fallback = kata;
}
curr = kata.next;
}
if (chosen) |k| {
min_vruntime = k.vruntime;
return k;
}
if (current) |c| {
if (c.state == .Flowing) return c;
}
if (fallback) |k| return k;
return null;
}
fn clear_current() void {
current = null;
}
fn halt_loop() noreturn {
while (true) {
cpu.halt_processor();
}
}
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