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Use wfi to sleep a cpu if no process is found while cycling pool #9

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Use wfi to sleep a cpu if no process is found while cycling pool #9

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11 changes: 11 additions & 0 deletions src/kernel/proc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -668,6 +668,7 @@ pub fn scheduler() -> ! {
// Avoid deadlock by ensuring thet devices can interrupt.
intr_on();

let mut found : bool = false;
for p in PROCS.pool.iter() {
let mut inner = p.inner.lock();
if inner.state == ProcState::RUNNABLE {
Expand All @@ -682,6 +683,16 @@ pub fn scheduler() -> ! {
// Process is done running for now.
// It should have changed its p->state before coming back.
c.proc.take();
found = true;
}
}
if found == false {
intr_on();
// If pool cycle ran without a process running...
// ...park cpu until interrupt
// This prevents cpu from red-lining for no reason
unsafe {
asm!("wfi");
}
}
}
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