Remove vfs dependency on kernel, implement I/O completion ports

src/xenia/kernel/xiocompletion.h

@@ -0,0 +1,54 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_KERNEL_XIOCOMPLETION_H_
+#define XENIA_KERNEL_XIOCOMPLETION_H_
+
+#include <queue>
+
+#include "xenia/base/threading.h"
+#include "xenia/kernel/xobject.h"
+#include "xenia/xbox.h"
+
+namespace xe {
+namespace kernel {
+
+class XIOCompletion : public XObject {
+ public:
+  static const Type kType = kTypeIOCompletion;
+
+  explicit XIOCompletion(KernelState* kernel_state);
+  ~XIOCompletion() override;
+
+  struct IONotification {
+    uint32_t key_context;
+    uint32_t apc_context;
+    uint32_t status;
+    uint32_t num_bytes;
+  };
+
+  void QueueNotification(IONotification& notification);
+  IONotification DequeueNotification();
+
+  // If you call this and it returns true, you MUST dequeue a notification!
+  // Returns true if the wait was cancelled because a notification was queued.
+  bool WaitForNotification(uint64_t wait_ticks);
+
+ private:
+  static const uint32_t kMaxNotifications = 1024;
+
+  std::mutex notification_lock_;
+  std::queue<IONotification> notifications_;
+  std::unique_ptr<threading::Semaphore> notification_semaphore_ = nullptr;
+};
+
+}  // namespace kernel
+}  // namespace xe
+
+#endif // XENIA_KERNEL_XIOCOMPLETION_H_