зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
4.3 KiB
C++
118 строки
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 ProfiledThreadData_h
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#define ProfiledThreadData_h
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#include "BaseProfilingStack.h"
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#include "platform.h"
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#include "ProfileBufferEntry.h"
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#include "ThreadInfo.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/UniquePtr.h"
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#include <string>
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namespace mozilla {
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namespace baseprofiler {
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class ProfileBuffer;
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// This class contains information about a thread that is only relevant while
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// the profiler is running, for any threads (both alive and dead) whose thread
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// name matches the "thread filter" in the current profiler run.
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// ProfiledThreadData objects may be kept alive even after the thread is
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// unregistered, as long as there is still data for that thread in the profiler
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// buffer.
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//
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// Accesses to this class are protected by the profiler state lock.
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//
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// Created as soon as the following are true for the thread:
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// - The profiler is running, and
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// - the thread matches the profiler's thread filter, and
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// - the thread is registered with the profiler.
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// So it gets created in response to either (1) the profiler being started (for
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// an existing registered thread) or (2) the thread being registered (if the
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// profiler is already running).
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//
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// The thread may be unregistered during the lifetime of ProfiledThreadData.
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// If that happens, NotifyUnregistered() is called.
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//
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// This class is the right place to store buffer positions. Profiler buffer
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// positions become invalid if the profiler buffer is destroyed, which happens
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// when the profiler is stopped.
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class ProfiledThreadData final {
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public:
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explicit ProfiledThreadData(ThreadInfo* aThreadInfo);
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~ProfiledThreadData();
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void NotifyUnregistered(uint64_t aBufferPosition) {
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mLastSample = Nothing();
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MOZ_ASSERT(!mBufferPositionWhenReceivedJSContext,
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"JSContext should have been cleared before the thread was "
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"unregistered");
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mUnregisterTime = TimeStamp::NowUnfuzzed();
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mBufferPositionWhenUnregistered = Some(aBufferPosition);
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}
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Maybe<uint64_t> BufferPositionWhenUnregistered() {
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return mBufferPositionWhenUnregistered;
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}
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Maybe<uint64_t>& LastSample() { return mLastSample; }
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void StreamJSON(const ProfileBuffer& aBuffer, SpliceableJSONWriter& aWriter,
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const std::string& aProcessName,
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const TimeStamp& aProcessStartTime, double aSinceTime);
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const RefPtr<ThreadInfo> Info() const { return mThreadInfo; }
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void NotifyReceivedJSContext(uint64_t aCurrentBufferPosition) {
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mBufferPositionWhenReceivedJSContext = Some(aCurrentBufferPosition);
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}
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private:
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// Group A:
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// The following fields are interesting for the entire lifetime of a
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// ProfiledThreadData object.
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// This thread's thread info.
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const RefPtr<ThreadInfo> mThreadInfo;
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// Group B:
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// The following fields are only used while this thread is alive and
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// registered. They become Nothing() once the thread is unregistered.
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// When sampling, this holds the position in ActivePS::mBuffer of the most
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// recent sample for this thread, or Nothing() if there is no sample for this
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// thread in the buffer.
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Maybe<uint64_t> mLastSample;
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// Only non-Nothing() if the thread currently has a JSContext.
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Maybe<uint64_t> mBufferPositionWhenReceivedJSContext;
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// Group C:
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// The following fields are only used once this thread has been unregistered.
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Maybe<uint64_t> mBufferPositionWhenUnregistered;
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TimeStamp mUnregisterTime;
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};
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void StreamSamplesAndMarkers(const char* aName, int aThreadId,
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const ProfileBuffer& aBuffer,
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SpliceableJSONWriter& aWriter,
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const std::string& aProcessName,
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const TimeStamp& aProcessStartTime,
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const TimeStamp& aRegisterTime,
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const TimeStamp& aUnregisterTime,
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double aSinceTime, UniqueStacks& aUniqueStacks);
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} // namespace baseprofiler
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} // namespace mozilla
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#endif // ProfiledThreadData_h
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