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75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef SQLITEINTERPOSER_H_
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#define SQLITEINTERPOSER_H_
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#ifdef MOZ_ENABLE_PROFILER_SPS
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#include "IOInterposer.h"
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#include "mozilla/Atomics.h"
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namespace mozilla {
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/**
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* This class provides main thread I/O interposing for SQLite reads, writes,
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* and fsyncs. Most methods must be called from the main thread, except for:
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* Enable
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* OnRead
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* OnWrite
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* OnFSync
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*/
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class SQLiteInterposer MOZ_FINAL : public IOInterposerModule
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{
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public:
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static IOInterposerModule* GetInstance(IOInterposeObserver* aObserver,
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IOInterposeObserver::Operation aOpsToInterpose);
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/**
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* This function must be called from the main thread, and furthermore
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* it must be called when no other threads are executing in OnRead, OnWrite,
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* or OnFSync. Effectivly this restricts us to calling it only after all other
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* threads have been stopped during shutdown.
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*/
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static void ClearInstance();
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~SQLiteInterposer();
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void Enable(bool aEnable);
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typedef void (*EventHandlerFn)(double&);
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static void OnRead(double& aDuration);
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static void OnWrite(double& aDuration);
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static void OnFSync(double& aDuration);
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private:
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SQLiteInterposer();
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bool Init(IOInterposeObserver* aObserver,
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IOInterposeObserver::Operation aOpsToInterpose);
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IOInterposeObserver* mObserver;
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IOInterposeObserver::Operation mOps;
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Atomic<uint32_t,ReleaseAcquire> mEnabled;
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};
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} // namespace mozilla
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#else // MOZ_ENABLE_PROFILER_SPS
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namespace mozilla {
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class SQLiteInterposer MOZ_FINAL
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{
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public:
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typedef void (*EventHandlerFn)(double&);
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static inline void OnRead(double& aDuration) {}
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static inline void OnWrite(double& aDuration) {}
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static inline void OnFSync(double& aDuration) {}
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};
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} // namespace mozilla
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#endif // MOZ_ENABLE_PROFILER_SPS
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#endif // SQLITEINTERPOSER_H_
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