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