34 lines
858 B
C++
34 lines
858 B
C++
#include "idlethread.h"
|
|
|
|
#include "../arch/core.h"
|
|
#include "../arch/lapic.h"
|
|
#include "../debug/output.h"
|
|
#include "../interrupt/guard.h"
|
|
#include "../thread/scheduler.h"
|
|
|
|
void IdleThread::action() {
|
|
while (true) {
|
|
Core::Interrupt::disable();
|
|
if (Guard::unsafeConstAccess()
|
|
.scheduler.isEmpty()) { // XXX: not a fan ...
|
|
// To save energy we can disable the timer on a core as soon as no
|
|
// clock needs to be managed. This function is called from the idle
|
|
// loop.
|
|
bool can_sleep =
|
|
!Guard::unsafeConstAccess().bellringer.bellPending();
|
|
if (can_sleep) {
|
|
LAPIC::Timer::setMasked(true);
|
|
}
|
|
Core::idle();
|
|
// We woke up. Start ticking again
|
|
//dout << "idle ";
|
|
|
|
LAPIC::Timer::setMasked(false);
|
|
} else {
|
|
Core::Interrupt::enable();
|
|
Guarded g = Guard::enter();
|
|
g.vault().scheduler.resume();
|
|
}
|
|
}
|
|
}
|