[Zion] Add a proc/thread cleanup thread for future use.

zion/scheduler/cleanup.cpp

@@ -0,0 +1,32 @@
+#include "scheduler/cleanup.h"
+
+void ProcessCleanup::CleanupLoop() {
+  while (true) {
+    while (process_list_.empty() && thread_list_.empty()) {
+      semaphore_.Wait();
+    }
+    // TODO: I think we need to protect these lists with a mutex as well.
+    while (!process_list_.empty()) {
+      auto proc = process_list_.PopFront();
+      dbgln("CLEANUP Proc {}", proc->id());
+    }
+    while (!thread_list_.empty()) {
+      auto thread = thread_list_.PopFront();
+      dbgln("CLEANUP Thread {}.{}", thread->pid(), thread->tid());
+    }
+  }
+}
+
+void ProcessCleanup::CleanupProcess(glcr::RefPtr<Process> process) {
+  process_list_.PushBack(process);
+  semaphore_.Signal();
+}
+void ProcessCleanup::CleanupThread(glcr::RefPtr<Thread> thread) {
+  thread_list_.PushBack(thread);
+  semaphore_.Signal();
+}
+
+void CleanupThreadEntry(ProcessCleanup* cleanup) {
+  cleanup->CleanupLoop();
+  UNREACHABLE;
+}