1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/vr/VRThread.cpp b/gfx/vr/VRThread.cpp
new file mode 100644
index 0000000000..818a16dbfd
--- /dev/null
+++ b/gfx/vr/VRThread.cpp
@@ -0,0 +1,117 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VRThread.h"
+#include "nsDebug.h"
+#include "nsThreadManager.h"
+#include "nsThread.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+
+namespace gfx {
+
+static const uint32_t kDefaultThreadLifeTime = 60;  // in 60 seconds.
+static const uint32_t kDelayPostTaskTime = 20000;   // in 20000 ms.
+
+VRThread::VRThread(const nsCString& aName)
+    : mThread(nullptr), mLifeTime(kDefaultThreadLifeTime), mStarted(false) {
+  mName = aName;
+}
+
+VRThread::~VRThread() { Shutdown(); }
+
+void VRThread::Start() {
+  if (!mThread) {
+    nsresult rv = NS_NewNamedThread(mName, getter_AddRefs(mThread));
+    MOZ_ASSERT(mThread);
+
+    if (NS_FAILED(rv)) {
+      MOZ_ASSERT(false, "Failed to create a vr thread.");
+    }
+    RefPtr<Runnable> runnable =
+        NewRunnableMethod<TimeStamp>("gfx::VRThread::CheckLife", this,
+                                     &VRThread::CheckLife, TimeStamp::Now());
+    // Post it to the main thread for tracking the lifetime.
+    nsCOMPtr<nsIThread> mainThread;
+    rv = NS_GetMainThread(getter_AddRefs(mainThread));
+    if (NS_FAILED(rv)) {
+      NS_WARNING("VRThread::Start() could not get Main thread");
+      return;
+    }
+    mainThread->DelayedDispatch(runnable.forget(), kDelayPostTaskTime);
+  }
+  mStarted = true;
+  mLastActiveTime = TimeStamp::Now();
+}
+
+void VRThread::Shutdown() {
+  if (mThread) {
+    if (nsThreadManager::get().IsNSThread()) {
+      mThread->Shutdown();
+    } else {
+      NS_WARNING(
+          "VRThread::Shutdown() may only be called from an XPCOM thread");
+      NS_DispatchToMainThread(NS_NewRunnableFunction(
+          "VRThread::Shutdown", [thread = mThread]() { thread->Shutdown(); }));
+    }
+    mThread = nullptr;
+  }
+  mStarted = false;
+}
+
+const nsCOMPtr<nsIThread> VRThread::GetThread() const { return mThread; }
+
+void VRThread::PostTask(already_AddRefed<Runnable> aTask) {
+  PostDelayedTask(std::move(aTask), 0);
+}
+
+void VRThread::PostDelayedTask(already_AddRefed<Runnable> aTask,
+                               uint32_t aTime) {
+  MOZ_ASSERT(mStarted, "Must call Start() before posting tasks.");
+  MOZ_ASSERT(mThread);
+  mLastActiveTime = TimeStamp::Now();
+
+  if (!aTime) {
+    mThread->Dispatch(std::move(aTask), NS_DISPATCH_NORMAL);
+  } else {
+    mThread->DelayedDispatch(std::move(aTask), aTime);
+  }
+}
+
+void VRThread::CheckLife(TimeStamp aCheckTimestamp) {
+  // VR system is going to shutdown.
+  if (!mStarted) {
+    Shutdown();
+    return;
+  }
+
+  const TimeDuration timeout = TimeDuration::FromSeconds(mLifeTime);
+  if ((aCheckTimestamp - mLastActiveTime) > timeout) {
+    Shutdown();
+  } else {
+    RefPtr<Runnable> runnable =
+        NewRunnableMethod<TimeStamp>("gfx::VRThread::CheckLife", this,
+                                     &VRThread::CheckLife, TimeStamp::Now());
+    // Post it to the main thread for tracking the lifetime.
+    nsCOMPtr<nsIThread> mainThread;
+    nsresult rv = NS_GetMainThread(getter_AddRefs(mainThread));
+    if (NS_FAILED(rv)) {
+      NS_WARNING("VRThread::CheckLife() could not get Main thread");
+      return;
+    }
+    mainThread->DelayedDispatch(runnable.forget(), kDelayPostTaskTime);
+  }
+}
+
+void VRThread::SetLifeTime(uint32_t aLifeTime) { mLifeTime = aLifeTime; }
+
+uint32_t VRThread::GetLifeTime() { return mLifeTime; }
+
+bool VRThread::IsActive() { return !!mThread; }
+
+}  // namespace gfx
+}  // namespace mozilla