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

src/xenia/kernel/xiocompletion.cc

@@ -0,0 +1,50 @@
+/**
+ ******************************************************************************
+ * 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. *
+ ******************************************************************************
+ */
+
+#include "xenia/kernel/xiocompletion.h"
+
+namespace xe {
+namespace kernel {
+
+XIOCompletion::XIOCompletion(KernelState* kernel_state)
+    : XObject(kernel_state, kTypeIOCompletion) {
+  notification_semaphore_ = threading::Semaphore::Create(0, kMaxNotifications);
+}
+
+XIOCompletion::~XIOCompletion() = default;
+
+void XIOCompletion::QueueNotification(IONotification& notification) {
+  std::unique_lock<std::mutex> lock(notification_lock_);
+
+  notifications_.push(notification);
+  notification_semaphore_->Release(1, nullptr);
+}
+
+XIOCompletion::IONotification XIOCompletion::DequeueNotification() {
+  std::unique_lock<std::mutex> lock(notification_lock_);
+  assert_false(notifications_.empty());
+
+  auto notification = notifications_.front();
+  notifications_.pop();
+
+  return notification;
+}
+
+bool XIOCompletion::WaitForNotification(uint64_t wait_ticks) {
+  auto ms = std::chrono::milliseconds(TimeoutTicksToMs(wait_ticks));
+  auto res = threading::Wait(notification_semaphore_.get(), false, ms);
+  if (res == threading::WaitResult::kSuccess) {
+    return true;
+  }
+
+  return false;
+}
+
+}  // namespace kernel
+}  // namespace xe