| // 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 BASE_TRACE_EVENT_TRACE_SAMPLING_THREAD_H_ |
| #define BASE_TRACE_EVENT_TRACE_SAMPLING_THREAD_H_ |
| |
| #include "base/synchronization/cancellation_flag.h" |
| #include "base/synchronization/waitable_event.h" |
| #include "base/trace_event/trace_event.h" |
| |
| namespace base { |
| namespace trace_event { |
| |
| class TraceBucketData; |
| typedef base::Callback<void(TraceBucketData*)> TraceSampleCallback; |
| |
| // This object must be created on the IO thread. |
| class TraceSamplingThread : public PlatformThread::Delegate { |
| public: |
| TraceSamplingThread(); |
| ~TraceSamplingThread() override; |
| |
| // Implementation of PlatformThread::Delegate: |
| void ThreadMain() override; |
| |
| static void DefaultSamplingCallback(TraceBucketData* bucket_data); |
| |
| void Stop(); |
| void WaitSamplingEventForTesting(); |
| |
| private: |
| friend class TraceLog; |
| |
| void GetSamples(); |
| // Not thread-safe. Once the ThreadMain has been called, this can no longer |
| // be called. |
| void RegisterSampleBucket(TRACE_EVENT_API_ATOMIC_WORD* bucket, |
| const char* const name, |
| TraceSampleCallback callback); |
| // Splits a combined "category\0name" into the two component parts. |
| static void ExtractCategoryAndName(const char* combined, |
| const char** category, |
| const char** name); |
| std::vector<TraceBucketData> sample_buckets_; |
| bool thread_running_; |
| CancellationFlag cancellation_flag_; |
| WaitableEvent waitable_event_for_testing_; |
| }; |
| |
| } // namespace trace_event |
| } // namespace base |
| |
| #endif // BASE_TRACE_EVENT_TRACE_SAMPLING_THREAD_H_ |