[zion] Move IPC objects to share code

zion/object/ipc_object.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <glacier/container/intrusive_list.h>
+#include <glacier/status/error.h>
+
+#include "include/ztypes.h"
+#include "lib/message_queue.h"
+#include "lib/mutex.h"
+#include "object/kernel_object.h"
+
+class IpcObject : public KernelObject {
+ public:
+  IpcObject(){};
+  virtual ~IpcObject() {}
+
+  virtual glcr::ErrorCode Send(uint64_t num_bytes, const void* bytes,
+                               uint64_t num_caps, const z_cap_t* caps) final;
+  virtual glcr::ErrorCode Recv(uint64_t* num_bytes, void* bytes,
+                               uint64_t* num_caps, z_cap_t* caps) final;
+
+  bool HasMessages() {
+    MutexHolder h(mutex_);
+    return !GetRecvMessageQueue().empty();
+  }
+
+  virtual MessageQueue& GetSendMessageQueue() = 0;
+  virtual MessageQueue& GetRecvMessageQueue() = 0;
+
+ protected:
+  // FIXME: move locking and blocked threads to the message queue itself.
+  Mutex mutex_{"ipc"};
+  glcr::IntrusiveList<Thread> blocked_threads_;
+};