Kernel: Only consider scheduler Running threads if they're the current

There will be as many threads in Running state as there are CPUs.
Only consider a thread in that state if it is the current thread
already.

Kernel/Scheduler.cpp

@@ -465,8 +465,8 @@ bool Scheduler::pick_next()
  });
 
 #ifdef SCHEDULER_RUNNABLE_DEBUG
- dbg() << "Non-runnables:";
- Scheduler::for_each_nonrunnable([](Thread& thread) -> IterationDecision {
+ dbg() << "Scheduler[" << Processor::current().id() << "]: Non-runnables:";
+ Scheduler::for_each_nonrunnable([&](Thread& thread) -> IterationDecision {
  if (thread.state() == Thread::Queued)
  dbg() << " " << String::format("%-12s", thread.state_string()) << " " << thread << " @ " << String::format("%w", thread.tss().cs) << ":" << String::format("%x", thread.tss().eip) << " Reason: " << (thread.wait_reason() ? thread.wait_reason() : "none");
  else if (thread.state() == Thread::Dying)
@@ -476,7 +476,7 @@ bool Scheduler::pick_next()
  return IterationDecision::Continue;
  });
 
- dbg() << "Runnables:";
+ dbg() << "Scheduler[" << Processor::current().id() << "]: Runnables:";
  Scheduler::for_each_runnable([](Thread& thread) -> IterationDecision {
  dbg() << " " << String::format("%3u", thread.effective_priority()) << "/" << String::format("%2u", thread.priority()) << " " << String::format("%-12s", thread.state_string()) << " " << thread << " @ " << String::format("%w", thread.tss().cs) << ":" << String::format("%x", thread.tss().eip);
  return IterationDecision::Continue;
@@ -487,8 +487,11 @@ bool Scheduler::pick_next()
 
  Vector<Thread*, 128> sorted_runnables;
  for_each_runnable([&](auto& thread) {
- if ((thread.affinity() & (1u << Processor::current().id())) != 0)
- sorted_runnables.append(&thread);
+ if ((thread.affinity() & (1u << Processor::current().id())) == 0)
+ return IterationDecision::Continue;
+ if (thread.state() == Thread::Running && &thread != current_thread)
+ return IterationDecision::Continue;
+ sorted_runnables.append(&thread);
  if (&thread == scheduler_data.m_pending_beneficiary) {
  thread_to_schedule = &thread;
  return IterationDecision::Break;