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Scheduler with working threads.

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Currently only one process but it is a start.
This commit is contained in:
Drew Galbraith 2023-05-18 13:24:02 -07:00
parent 960cbf9519
commit cb41953354
10 changed files with 136 additions and 5 deletions
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32
zion/scheduler/scheduler.cpp
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@ -5,6 +5,8 @@
namespace sched {
namespace {
extern "C" void context_switch(uint64_t* current_esp, uint64_t* next_esp);
// Simple linked list class with the intent of eventually replacing this with a
// map.
class ProcList {
@ -47,13 +49,41 @@ class Scheduler {
Process* root = Process::RootProcess();
current_thread_ = root->GetThread(0);
proc_list_.InsertProcess(Process::RootProcess());
// FIXME: Don't enqueue threads here.
Enqueue(root->CreateThread());
}
void Enable() { enabled_ = true; }
Process& CurrentProcess() { return current_thread_->process(); }
Thread& CurrentThread() { return *current_thread_; }
void Yield() {}
void Enqueue(Thread* thread) {
Thread* back = current_thread_;
while (back->next_thread_ != nullptr) {
back = back->next_thread_;
}
back->next_thread_ = thread;
}
void Yield() {
if (!enabled_) {
return;
}
asm volatile("cli");
if (current_thread_->next_thread_ == nullptr) {
dbgln("No next thread, continue");
return;
}
Thread* prev = current_thread_;
current_thread_ = current_thread_->next_thread_;
prev->next_thread_ = nullptr;
Enqueue(prev);
context_switch(prev->Rsp0Ptr(), current_thread_->Rsp0Ptr());
asm volatile("sti");
}
private:
bool enabled_ = false;