77 lines
2.3 KiB
Rust
77 lines
2.3 KiB
Rust
use {
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alloc::{collections::VecDeque, rc::Rc, slice, vec::Vec},
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hbvm::validate::validate,
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};
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use {crate::host::TrapHandler, hbvm::Vm};
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const TIMER_QUOTIENT: usize = 100;
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pub struct Scheduler<'a> {
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data: VecDeque<Vm<'a, TrapHandler, TIMER_QUOTIENT>>,
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}
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// NOTE: This is a very simple schduler and it sucks and should be replaced with a better one
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// Written By Yours Truly: Munir
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impl Scheduler<'_> {
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pub fn new() -> Self {
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Self {
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data: VecDeque::new(),
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}
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}
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pub fn new_process(&mut self, program: Vec<u8>) {
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let prog = program.clone();
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let prog_arc = Rc::new(prog);
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let binding = Rc::try_unwrap(prog_arc).ok().unwrap();
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#[allow(clippy::redundant_else)]
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if let Err(e) = validate(&program.as_slice()) {
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log::error!("Program validation error: {e:?}");
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} else {
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log::info!("valid program");
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unsafe {
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let slice = slice::from_raw_parts(binding.as_ptr(), binding.len());
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let mut vm = Vm::new_unchecked(&*slice, TrapHandler);
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vm.memory.insert_test_page();
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self.data.push_front(vm);
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}
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}
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}
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pub fn run(&mut self) -> ! {
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loop {
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// If there are no programs to run then sleep.
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if self.data.is_empty() {
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use crate::arch::spin_loop;
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spin_loop();
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}
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let mut prog = self.data.pop_front().unwrap();
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let ret = prog.run();
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match ret {
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Ok(oki) => match oki {
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hbvm::VmRunOk::End => {
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log::info!(
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"Program ended. {} programs remaining.",
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// Add one here because we pop a program
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self.data.len() + 1
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)
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}
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hbvm::VmRunOk::Timer => {
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log::info!("Timer exhausted. Scheduled program");
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self.data.push_back(prog);
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}
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hbvm::VmRunOk::Ecall => {
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// panic!();
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log::info!("{:?}", prog.registers);
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self.data.push_back(prog);
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}
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},
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Err(_) => {}
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}
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}
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}
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}
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