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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/storageframework/generic/thread/thread.h>
#include <vespa/vespalib/util/cpu_usage.h>
#include <array>
#include <atomic>
#include <optional>
namespace storage::framework::defaultimplementation {
struct ThreadPoolImpl;
class ThreadImpl final : public Thread
{
/**
* Internal data race free implementation of tick data that maps to and
* from ThreadTickData. We hide the atomicity of this since atomic vars
* are not CopyConstructible and thus would impose unnecessary limitations
* on code using it.
*/
struct AtomicThreadTickData {
AtomicThreadTickData() noexcept
: _lastTickType(),
_lastTick(vespalib::steady_time(vespalib::duration::zero())),
_maxProcessingTimeSeen(),
_maxWaitTimeSeen()
{}
std::atomic<CycleType> _lastTickType;
std::atomic<vespalib::steady_time> _lastTick;
std::atomic<vespalib::duration> _maxProcessingTimeSeen;
std::atomic<vespalib::duration> _maxWaitTimeSeen;
// struct stores and loads are both data race free with relaxed
// memory semantics. This means it's possible to observe stale/partial
// state in a case with concurrent readers/writers.
ThreadTickData loadRelaxed() const noexcept;
void storeRelaxed(const ThreadTickData& newState) noexcept;
};
ThreadPoolImpl& _pool;
Runnable& _runnable;
ThreadProperties _properties;
std::array<AtomicThreadTickData, 3> _tickData;
std::atomic<uint32_t> _tickDataPtr;
std::atomic<bool> _interrupted;
bool _joined;
std::thread _thread;
std::optional<vespalib::CpuUsage::Category> _cpu_category;
void run();
public:
ThreadImpl(ThreadPoolImpl&, Runnable&, vespalib::stringref id, vespalib::duration waitTime,
vespalib::duration maxProcessTime, int ticksBeforeWait,
std::optional<vespalib::CpuUsage::Category> cpu_category);
~ThreadImpl() override;
bool interrupted() const override;
bool joined() const override;
void interrupt() override;
void join() override;
vespalib::string get_live_thread_stack_trace() const override;
void registerTick(CycleType, vespalib::steady_time) override;
void registerTick(CycleType cycleType) override;
vespalib::duration getWaitTime() const override {
return _properties.getWaitTime();
}
int getTicksBeforeWait() const override {
return _properties.getTicksBeforeWait();
}
void setTickData(const ThreadTickData&);
ThreadTickData getTickData() const override;
const ThreadProperties& getProperties() const override { return _properties; }
};
}
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