Hiva::BaseTime

Time（时间点）基类，实现了基础运算接口。HivaTime、WallTime、SteadyTime均继承BaseTime，支持BaseTime的所有运算操作。

BaseDuration类的定义请参见Hiva::Duration类型定义。

namespace Hiva {
/* Base class for Time implementations. */
class BaseTime {
public:
    BaseTime();
    BaseTime(const uint32_t secVal, const uint32_t nsecVal);
    explicit BaseTime(const double doubleSec);
    virtual ~BaseTime() = default;
    double ToSec() const;
    bool FromSec(const double doubleSec);
    bool FromTimespec(const timespec &timeVal);
    uint64_t ToNSec() const;
    bool FromNSec(const uint64_t uint64Nsec);
    bool IsZero() const;
    BaseDuration operator-(const BaseTime &rhs) const;
    BaseTime operator+(const BaseDuration &rhs) const;
    BaseTime operator-(const BaseDuration &rhs) const;
    BaseTime &operator+=(const BaseDuration &rhs);
    BaseTime &operator-=(const BaseDuration &rhs);
    bool operator==(const BaseTime &rhs) const;
    bool operator!=(const BaseTime &rhs) const;
    bool operator<(const BaseTime &rhs) const;
    bool operator>(const BaseTime &rhs) const;
    bool operator<=(const BaseTime &rhs) const;
    bool operator>=(const BaseTime &rhs) const;
    uint32_t sec;
    uint32_t nsec;
};
std::ostream &operator<<(std::ostream &outStream, const BaseTime &rhs);
}

Hiva::HivaTime

继承BaseTime，支持BaseTime的所有运算操作。在使能仿真时间的时候为仿真时间，在不使能仿真时间的时候为WallTime（墙上时间）。

namespace Hiva {
/* Time may either represent wall clock time or simulation time. */
class HivaTime : public BaseTime {
public:
    HivaTime();
    HivaTime(const uint32_t secVal, const uint32_t nsecVal) noexcept;
    explicit HivaTime(const double doubleSec) noexcept;
    HivaTime(const BaseTime &timeVal);
    ~HivaTime() override = default;
    static bool UseSystemTime();
    static bool IsSimTime();
    static bool IsSystemTime();
    static HivaTime Now();
    static void SetNow(const HivaTime &newSimTime);
    static void Init();
    static void Shutdown();
    static bool GetState();
    static bool IsValid();
    static bool WaitForValid();
    static bool WaitForValid(const Hiva::WallDuration &timeout);
    static bool SleepUntil(const HivaTime &endTime);
private:
    static bool stopped;
    static std::mutex simTimeMutex;
    static bool initialized;
    static bool useSimTime;
    static HivaTime simTime;
};
}

Hiva::WallTime

墙上时间，即CLOCK_REALTIME，继承BaseTime，支持BaseTime的所有运算操作。

namespace Hiva {
class WallTime : public BaseTime {
public:
    WallTime();
    WallTime(const uint32_t secVal, const uint32_t nsecVal);
    explicit WallTime(const double doubleSec);
    WallTime(const BaseTime &timeVal);
    ~WallTime() override = default;
    static WallTime Now();
    static bool SleepUntil(const WallTime &endTime);
    static bool IsSystemTime();
};
} 

Hiva::SteadyTime

单独递增时间，即CLOCK_MONOTONIC，不受时间跳变影响。继承BaseTime，支持BaseTime的所有运算操作。

namespace Hiva {
class SteadyTime : public BaseTime {
public:
    SteadyTime();
    SteadyTime(const uint32_t secVal, const uint32_t nsecVal);
    explicit SteadyTime(const double doubleSec);
    SteadyTime(const BaseTime &timeVal);
    ~SteadyTime() override = default;
    static SteadyTime Now();
    static bool SleepUntil(const SteadyTime &endTime);
    static bool IsSystemTime();
};
} 

Hiva::Time类型定义