GPU process terminates on hang.

I added a watchdog thread that intermitently checks the main thread can respond to tasks posted on its message queue.

I fixed some bugs that preventede GGL from failing when the GPU channel was lost.

Added a command line swith to disable the watchdog thread for debugging purposes.

TEST=try, check WebGL works, check about:gpuhang terminates process.
BUG=38739,53871

Review URL: http://codereview.chromium.org/3528012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@61718 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 40 insertions, 0 deletions

diff --git a/chrome/gpu/gpu_watchdog_thread.h b/chrome/gpu/gpu_watchdog_thread.h
new file mode 100644
index 0000000..6dbbc32
--- /dev/null
+++ b/chrome/gpu/gpu_watchdog_thread.h
@@ -0,0 +1,40 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_GPU_GPU_WATCHDOG_THREAD_H_
+#define CHROME_GPU_GPU_WATCHDOG_THREAD_H_
+
+#include "base/ref_counted.h"
+#include "base/scoped_ptr.h"
+#include "base/task.h"
+#include "base/thread.h"
+
+// A thread that intermitently sends tasks to a group of watched message loops
+// and deliberately crashes if one of them does not respond after a timeout.
+class GpuWatchdogThread : public base::Thread,
+                          public base::RefCountedThreadSafe<GpuWatchdogThread> {
+ public:
+  explicit GpuWatchdogThread(MessageLoop* watched_message_loop);
+  virtual ~GpuWatchdogThread();
+
+ protected:
+  virtual void Init();
+  virtual void CleanUp();
+
+ private:
+  void OnAcknowledge();
+  void OnCheck();
+  void PostAcknowledge();
+  void OnExit();
+  void Disable();
+
+  MessageLoop* watched_message_loop_;
+
+  typedef ScopedRunnableMethodFactory<GpuWatchdogThread> MethodFactory;
+  scoped_ptr<MethodFactory> method_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
+};
+
+#endif  // CHROME_GPU_GPU_WATCHDOG_THREAD_H_