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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |
| 6 #define COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |
| 7 |
| 8 #include "base/trace_event/memory_dump_manager.h" |
| 9 |
| 10 #include <stdint.h> |
| 11 |
| 12 #include "base/macros.h" |
| 13 #include "base/memory/ref_counted.h" |
| 14 #include "base/memory/singleton.h" |
| 15 #include "base/synchronization/lock.h" |
| 16 #include "components/tracing/tracing_export.h" |
| 17 |
| 18 namespace base { |
| 19 class SingleThreadTaskRunner; |
| 20 } // namespace base |
| 21 |
| 22 namespace tracing { |
| 23 |
| 24 class ChildTraceMessageFilter; |
| 25 |
| 26 // This class is a simple proxy class between the MemoryDumpManager and the |
| 27 // ChildTraceMessageFilter. It's only purpose is to adapt the lifetime of |
| 28 // CTMF to the demands of MDM, which expects the delegate to be thread-safe |
| 29 // and long lived. CTMF, instead, can be torn down during browser shutdown. |
| 30 // This class is registered as MDM delegate in child processes and handles |
| 31 // gracefully (and thread-safely) failures in the case of a lack of the CTMF. |
| 32 class TRACING_EXPORT ChildMemoryDumpManagerDelegateImpl |
| 33 : public base::trace_event::MemoryDumpManagerDelegate { |
| 34 public: |
| 35 static ChildMemoryDumpManagerDelegateImpl* GetInstance(); |
| 36 |
| 37 // base::trace_event::MemoryDumpManagerDelegate implementation. |
| 38 void RequestGlobalMemoryDump( |
| 39 const base::trace_event::MemoryDumpRequestArgs& args, |
| 40 const base::trace_event::MemoryDumpCallback& callback) override; |
| 41 uint64_t GetTracingProcessId() const override; |
| 42 |
| 43 void SetChildTraceMessageFilter(ChildTraceMessageFilter* ctmf); |
| 44 |
| 45 // Pass kInvalidTracingProcessId to invalidate the id. |
| 46 void set_tracing_process_id(uint64_t id) { |
| 47 DCHECK(tracing_process_id_ == |
| 48 base::trace_event::MemoryDumpManager::kInvalidTracingProcessId || |
| 49 id == |
| 50 base::trace_event::MemoryDumpManager::kInvalidTracingProcessId || |
| 51 id == tracing_process_id_); |
| 52 tracing_process_id_ = id; |
| 53 } |
| 54 |
| 55 protected: |
| 56 // Make CreateProcessDump() visible to ChildTraceMessageFilter. |
| 57 friend class ChildTraceMessageFilter; |
| 58 |
| 59 private: |
| 60 friend struct base::DefaultSingletonTraits< |
| 61 ChildMemoryDumpManagerDelegateImpl>; |
| 62 |
| 63 ChildMemoryDumpManagerDelegateImpl(); |
| 64 ~ChildMemoryDumpManagerDelegateImpl() override; |
| 65 |
| 66 ChildTraceMessageFilter* ctmf_; // Not owned. |
| 67 |
| 68 // The SingleThreadTaskRunner where the |ctmf_| lives. |
| 69 // It is NULL iff |cmtf_| is NULL. |
| 70 scoped_refptr<base::SingleThreadTaskRunner> ctmf_task_runner_; |
| 71 |
| 72 // Protects from concurrent access to |ctmf_task_runner_| to allow |
| 73 // RequestGlobalMemoryDump to be called from arbitrary threads. |
| 74 base::Lock lock_; |
| 75 |
| 76 // The unique id of the child process, created for tracing and is expected to |
| 77 // be valid only when tracing is enabled. |
| 78 uint64_t tracing_process_id_; |
| 79 |
| 80 DISALLOW_COPY_AND_ASSIGN(ChildMemoryDumpManagerDelegateImpl); |
| 81 }; |
| 82 |
| 83 } // namespace tracing |
| 84 |
| 85 #endif // COMPONENTS_TRACING_CHILD_CHILD_MEMORY_DUMP_MANAGER_DELEGATE_IMPL_H_ |
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