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[Zion] Add a thread sleep call.

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For now this can only sleep in increments of the scheduler quantum
(currently 50ms). It also uses a somewhat ineffecient way of tracking
the sleeping threads - it will scale linearly with the number of
sleeping threads.
This commit is contained in:
Drew Galbraith 2023-12-07 00:19:17 -08:00
parent 66e94ac41b
commit 8adde27d9b
9 changed files with 48 additions and 5 deletions
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31
zion/scheduler/scheduler.cpp
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@ -45,14 +45,11 @@ void Scheduler::Preempt() {
return;
}
DecrementSleepingThreads();
ClearDeadThreadsFromFront();
asm volatile("cli");
if (current_thread_ == sleep_thread_) {
// Sleep should never be preempted. (We should yield it if another thread
// becomes scheduleable).
return;
}
if (runnable_threads_.size() == 0) {
// Continue.
@ -102,9 +99,33 @@ void Scheduler::Yield() {
SwapToCurrent(*prev);
}
void Scheduler::Sleep(uint64_t millis) {
// FIXME: Improve resolution of sleep calls.
uint64_t ticks = (millis / 50) + 1;
current_thread_->SetSleepTicks(ticks);
current_thread_->SetState(Thread::SLEEPING);
sleeping_threads_.PushBack(current_thread_);
Yield();
}
void Scheduler::ClearDeadThreadsFromFront() {
while (runnable_threads_.size() > 0 &&
runnable_threads_.PeekFront()->IsDying()) {
runnable_threads_.PopFront();
}
}
void Scheduler::DecrementSleepingThreads() {
auto thread = sleeping_threads_.PeekFront();
while (thread) {
if (thread->DecrementSleepTicks()) {
auto thread_next = thread->next_;
sleeping_threads_.Remove(thread);
thread->SetState(Thread::RUNNABLE);
runnable_threads_.PushBack(thread);
thread = thread_next;
} else {
thread = thread->next_;
}
}
}