Iterative cleanup for GL programs in GPU process

gpu/ipc/service/gpu_channel.h

 // Copyright (c) 2012 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 GPU_IPC_SERVICE_GPU_CHANNEL_H_
 #define GPU_IPC_SERVICE_GPU_CHANNEL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
+#include <queue>
 #include <string>
 
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
 #include "base/threading/thread_checker.h"
 #include "base/trace_event/memory_dump_provider.h"
@@ skipping 153 matching lines @@
 
  protected:
   // The message filter on the io thread.
   scoped_refptr<GpuChannelMessageFilter> filter_;
 
   // Map of routing id to command buffer stub.
   base::ScopedPtrHashMap<int32_t, std::unique_ptr<GpuCommandBufferStub>> stubs_;
 
  private:
   friend class TestGpuChannel;
+  friend class GpuChannelDeleter;
 
   bool OnControlMessageReceived(const IPC::Message& msg);
 
   void HandleMessage(const scoped_refptr<GpuChannelMessageQueue>& queue);
 
   // Some messages such as WaitForGetOffsetInRange and WaitForTokenInRange are
   // processed as soon as possible because the client is blocked until they
   // are completed.
   void HandleOutOfOrderMessage(const IPC::Message& msg);
 
@@ skipping 275 matching lines @@
   scoped_refptr<SyncPointOrderData> sync_point_order_data_;
 
   scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
   scoped_refptr<PreemptionFlag> preempting_flag_;
   scoped_refptr<PreemptionFlag> preempted_flag_;
   SyncPointManager* const sync_point_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelMessageQueue);
 };
 
+// Helper class which stores state related to iterative deletion of a
+// GpuChannel.
+class GpuChannelDeleter {
+ public:
+  GpuChannelDeleter(std::unique_ptr<GpuChannel> channel);
+  ~GpuChannelDeleter();
+
+  bool DeleteWithTimeout(const base::TimeTicks& timeout);
+
+ private:
+  std::unique_ptr<GpuChannel> channel_;
+  std::queue<GpuCommandBufferStub*> pending_stubs_;
+};
+
 }  // namespace gpu
 
 #endif  // GPU_IPC_SERVICE_GPU_CHANNEL_H_