Index: components/tracing/child/child_memory_dump_manager_delegate_impl.h |
diff --git a/components/tracing/child/child_memory_dump_manager_delegate_impl.h b/components/tracing/child/child_memory_dump_manager_delegate_impl.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..fc27d96f279dc284ddcff403d2969832b26e3680 |
--- /dev/null |
+++ b/components/tracing/child/child_memory_dump_manager_delegate_impl.h |
@@ -0,0 +1,85 @@ |
+// Copyright 2015 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 COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |
+#define COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |
+ |
+#include "base/trace_event/memory_dump_manager.h" |
+ |
+#include <stdint.h> |
+ |
+#include "base/macros.h" |
+#include "base/memory/ref_counted.h" |
+#include "base/memory/singleton.h" |
+#include "base/synchronization/lock.h" |
+#include "components/tracing/tracing_export.h" |
+ |
+namespace base { |
+class SingleThreadTaskRunner; |
+} // namespace base |
+ |
+namespace tracing { |
+ |
+class ChildTraceMessageFilter; |
+ |
+// This class is a simple proxy class between the MemoryDumpManager and the |
+// ChildTraceMessageFilter. It's only purpose is to adapt the lifetime of |
+// CTMF to the demands of MDM, which expects the delegate to be thread-safe |
+// and long lived. CTMF, instead, can be torn down during browser shutdown. |
+// This class is registered as MDM delegate in child processes and handles |
+// gracefully (and thread-safely) failures in the case of a lack of the CTMF. |
+class TRACING_EXPORT ChildMemoryDumpManagerDelegateImpl |
+ : public base::trace_event::MemoryDumpManagerDelegate { |
+ public: |
+ static ChildMemoryDumpManagerDelegateImpl* GetInstance(); |
+ |
+ // base::trace_event::MemoryDumpManagerDelegate implementation. |
+ void RequestGlobalMemoryDump( |
+ const base::trace_event::MemoryDumpRequestArgs& args, |
+ const base::trace_event::MemoryDumpCallback& callback) override; |
+ uint64_t GetTracingProcessId() const override; |
+ |
+ void SetChildTraceMessageFilter(ChildTraceMessageFilter* ctmf); |
+ |
+ // Pass kInvalidTracingProcessId to invalidate the id. |
+ void set_tracing_process_id(uint64_t id) { |
+ DCHECK(tracing_process_id_ == |
+ base::trace_event::MemoryDumpManager::kInvalidTracingProcessId || |
+ id == |
+ base::trace_event::MemoryDumpManager::kInvalidTracingProcessId || |
+ id == tracing_process_id_); |
+ tracing_process_id_ = id; |
+ } |
+ |
+ protected: |
+ // Make CreateProcessDump() visible to ChildTraceMessageFilter. |
+ friend class ChildTraceMessageFilter; |
+ |
+ private: |
+ friend struct base::DefaultSingletonTraits< |
+ ChildMemoryDumpManagerDelegateImpl>; |
+ |
+ ChildMemoryDumpManagerDelegateImpl(); |
+ ~ChildMemoryDumpManagerDelegateImpl() override; |
+ |
+ ChildTraceMessageFilter* ctmf_; // Not owned. |
+ |
+ // The SingleThreadTaskRunner where the |ctmf_| lives. |
+ // It is NULL iff |cmtf_| is NULL. |
+ scoped_refptr<base::SingleThreadTaskRunner> ctmf_task_runner_; |
+ |
+ // Protects from concurrent access to |ctmf_task_runner_| to allow |
+ // RequestGlobalMemoryDump to be called from arbitrary threads. |
+ base::Lock lock_; |
+ |
+ // The unique id of the child process, created for tracing and is expected to |
+ // be valid only when tracing is enabled. |
+ uint64_t tracing_process_id_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(ChildMemoryDumpManagerDelegateImpl); |
+}; |
+ |
+} // namespace tracing |
+ |
+#endif // COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |