Clocks

Back to chrono

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Macros

Default macro definitions.

Define these in etl_profile.h to set your own duration types for the clocks.

ETL_CHRONO_SYSTEM_CLOCK_DURATION etl::chrono::nanoseconds

ETL_CHRONO_SYSTEM_CLOCK_IS_STEADY true

ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION etl::chrono::nanoseconds

ETL_CHRONO_HIGH_RESOLUTION_CLOCK_IS_STEADY true

ETL_CHRONO_STEADY_CLOCK_DURATION etl::chrono::nanoseconds

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Platform clock access

Declarations of the functions that must be defined to interface the clocks with the underlying platform.

extern "C" ETL_CHRONO_SYSTEM_CLOCK_DURATION::rep etl_get_system_clock();

extern "C" ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION::rep etl_get_high_resolution_clock();

extern "C" ETL_CHRONO_STEADY_CLOCK_DURATION::rep etl_get_steady_clock();

These functions must return the current count of the underlying clock. The value is in terms of the

clock duration defined for that clock.

Example:

If the system_clock duration is set to etl::chrono::nanoseconds, then a return value of 1000 represents 1000ns.

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system_clock

class system_clock

Member types

using duration = ETL_CHRONO_SYSTEM_CLOCK_DURATION

using rep = duration::rep

using period = duration::period

using time_point = time_point<system_clock, duration>

Member functions

static time_point now() ETL_NOEXCEPT

static time_t to_time_t(const time_point& t) ETL_NOEXCEPT

static time_point from_time_t(time_t t) ETL_NOEXCEPT

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high_resolution_clock

class high_resolution_clock

Member types

using duration = ETL_CHRONO_HIGH_RESOLUTION_CLOCK_DURATION

using rep = duration::rep

using period = duration::period

using time_point = time_point<high_resolution_clock, duration>

Member functions

static time_point now() ETL_NOEXCEPT

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steady_clock

class steady_clock

Member types

using duration = ETL_CHRONO_STEADY_CLOCK_DURATION

using rep = duration::rep

using period = duration::period

using time_point = time_point<steady_clock, duration>

Member functions

static time_point now() ETL_NOEXCEPT

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system_time

template <typename Duration>

using sys_time = etl::chrono::time_point<etl::chrono::system_clock, Duration>

using sys_seconds = sys_time<etl::chrono::seconds>

using sys_days = sys_time<etl::chrono::days>

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local_time

struct local_t

template <typename TDuration>

using local_time = etl::chrono::time_point<etl::chrono::local_t, TDuration>

using local_seconds = local_time<etl::chrono::seconds>

using local_days = local_time<etl::chrono::days>

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clock_cast

Cast a time point from one clock to another.

This implementation assumes all clock epochs are the same.

template <typename TToClock, typename TFromClock, typename TFromDuration>

ETL_CONSTEXPR14 etl::chrono::time_point<TToClock, typename TToClock::duration>

clock_cast(const etl::chrono::time_point<TFromClock, TFromDuration>& from_time_point) ETL_NOEXCEPT

chrono.h