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109 lines
4.3 KiB
C++
109 lines
4.3 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_INFO_H_
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#define BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_INFO_H_
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#include <memory>
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#include <set>
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#include "base/base_export.h"
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#include "base/memory/ref_counted.h"
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#include "base/trace_event/memory_dump_provider.h"
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namespace base {
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class SequencedTaskRunner;
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namespace trace_event {
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// Wraps a MemoryDumpProvider (MDP), which is registered via
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// MemoryDumpManager(MDM)::RegisterDumpProvider(), holding the extra information
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// required to deal with it (which task runner it should be invoked onto,
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// whether it has been disabled, etc.)
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// More importantly, having a refptr to this object guarantees that a MDP that
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// is not thread-bound (hence which can only be unregistered via
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// MDM::UnregisterAndDeleteDumpProviderSoon()) will stay alive as long as the
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// refptr is held.
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//
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// Lifetime:
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// At any time, there is at most one instance of this class for each instance
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// of a given MemoryDumpProvider, but there might be several scoped_refptr
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// holding onto each of this. Specifically:
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// - In nominal conditions, there is a refptr for each registered MDP in the
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// MDM's |dump_providers_| list.
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// - In most cases, the only refptr (in the |dump_providers_| list) is destroyed
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// by MDM::UnregisterDumpProvider().
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// - However, when MDM starts a dump, the list of refptrs is copied into the
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// ProcessMemoryDumpAsyncState. That list is pruned as MDP(s) are invoked.
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// - If UnregisterDumpProvider() is called on a non-thread-bound MDP while a
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// dump is in progress, the extar extra of the handle is destroyed in
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// MDM::SetupNextMemoryDump() or MDM::InvokeOnMemoryDump(), when the copy
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// inside ProcessMemoryDumpAsyncState is erase()-d.
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// - The PeakDetector can keep extra refptrs when enabled.
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struct BASE_EXPORT MemoryDumpProviderInfo
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: public RefCountedThreadSafe<MemoryDumpProviderInfo> {
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public:
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// Define a total order based on the |task_runner| affinity, so that MDPs
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// belonging to the same SequencedTaskRunner are adjacent in the set.
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struct Comparator {
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bool operator()(const scoped_refptr<MemoryDumpProviderInfo>& a,
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const scoped_refptr<MemoryDumpProviderInfo>& b) const;
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};
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using OrderedSet =
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std::set<scoped_refptr<MemoryDumpProviderInfo>, Comparator>;
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MemoryDumpProviderInfo(MemoryDumpProvider* dump_provider,
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const char* name,
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scoped_refptr<SequencedTaskRunner> task_runner,
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const MemoryDumpProvider::Options& options,
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bool whitelisted_for_background_mode);
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// It is safe to access the const fields below from any thread as they are
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// never mutated.
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MemoryDumpProvider* const dump_provider;
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// The |options| arg passed to MDM::RegisterDumpProvider().
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const MemoryDumpProvider::Options options;
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// Human readable name, not unique (distinct MDP instances might have the same
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// name). Used for debugging, testing and whitelisting for BACKGROUND mode.
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const char* const name;
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// The task runner on which the MDP::OnMemoryDump call should be posted onto.
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// Can be nullptr, in which case the MDP will be invoked on a background
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// thread handled by MDM.
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const scoped_refptr<SequencedTaskRunner> task_runner;
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// True if the dump provider is whitelisted for background mode.
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const bool whitelisted_for_background_mode;
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// These fields below, instead, are not thread safe and can be mutated only:
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// - On the |task_runner|, when not null (i.e. for thread-bound MDPS).
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// - By the MDM's background thread (or in any other way that guarantees
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// sequencing) for non-thread-bound MDPs.
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// Used to transfer ownership for UnregisterAndDeleteDumpProviderSoon().
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// nullptr in all other cases.
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std::unique_ptr<MemoryDumpProvider> owned_dump_provider;
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// For fail-safe logic (auto-disable failing MDPs).
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int consecutive_failures;
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// Flagged either by the auto-disable logic or during unregistration.
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bool disabled;
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private:
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friend class base::RefCountedThreadSafe<MemoryDumpProviderInfo>;
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~MemoryDumpProviderInfo();
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DISALLOW_COPY_AND_ASSIGN(MemoryDumpProviderInfo);
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};
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} // namespace trace_event
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} // namespace base
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#endif // BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_INFO_H_
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