/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SRC_TRACE_PROCESSOR_CLOCK_TRACKER_H_
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#define SRC_TRACE_PROCESSOR_CLOCK_TRACKER_H_
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#include <stdint.h>
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#include <array>
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#include <vector>
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#include "perfetto/base/logging.h"
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#include "perfetto/base/optional.h"
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namespace perfetto {
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namespace trace_processor {
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class TraceProcessorContext;
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enum ClockDomain : uint32_t {
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kBootTime, // Monotonic, counts also time in suspend mode.
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kMonotonic, // Monotonic, doesn't advance when the device is suspended.
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kRealTime, // Real time clock, can move backward (e.g. NTP adjustements).
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kNumClockDomains
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};
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class ClockTracker {
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public:
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explicit ClockTracker(TraceProcessorContext*);
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virtual ~ClockTracker();
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// Push a snapshot that tells what is the corresponding trace time for the
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// given |clock_time_ns| in the given clock domain. This is typically called
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// by the code that reads the ClockSnapshot packet.
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void SyncClocks(ClockDomain, int64_t clock_time_ns, int64_t trace_time_ns);
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// Converts the passed time in the given clock domain to the global trace
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// time (CLOCK_BOOTTIME for Android traces).
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base::Optional<int64_t> ToTraceTime(ClockDomain, int64_t clock_time_ns);
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int64_t GetFirstTimestamp(ClockDomain domain) const {
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PERFETTO_DCHECK(!clocks_[domain].empty());
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return clocks_[domain].front().clock_time_ns;
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}
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private:
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ClockTracker(const ClockTracker&) = delete;
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ClockTracker& operator=(const ClockTracker&) = delete;
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struct ClockSnapshot {
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int64_t clock_time_ns;
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int64_t trace_time_ns;
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};
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TraceProcessorContext* const context_;
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using ClockSnapshotVector = std::vector<ClockSnapshot>;
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std::array<ClockSnapshotVector, kNumClockDomains> clocks_;
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};
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} // namespace trace_processor
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} // namespace perfetto
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#endif // SRC_TRACE_PROCESSOR_CLOCK_TRACKER_H_
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