9.1. Introduction

The Clock Manager provides support for time of day and other time related capabilities. The directives provided by the Clock Manager are:

• rtems_clock_set() - Sets the CLOCK_REALTIME to the time of day.

• rtems_clock_get_tod() - Gets the time of day associated with the current CLOCK_REALTIME.

• rtems_clock_get_tod_timeval() - Gets the seconds and microseconds elapsed since the Unix epoch and the current CLOCK_REALTIME.

• rtems_clock_get_realtime() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in seconds and nanoseconds format.

• rtems_clock_get_realtime_bintime() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in binary time format.

• rtems_clock_get_realtime_timeval() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in seconds and microseconds format.

• rtems_clock_get_realtime_coarse() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in coarse resolution in seconds and nanoseconds format.

• rtems_clock_get_realtime_coarse_bintime() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in coarse resolution in binary time format.

• rtems_clock_get_realtime_coarse_timeval() - Gets the time elapsed since the Unix epoch measured using CLOCK_REALTIME in coarse resolution in seconds and microseconds format.

• rtems_clock_get_monotonic() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in seconds and nanoseconds format.

• rtems_clock_get_monotonic_bintime() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in binary time format.

• rtems_clock_get_monotonic_sbintime() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in signed binary time format.

• rtems_clock_get_monotonic_timeval() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in seconds and microseconds format.

• rtems_clock_get_monotonic_coarse() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in coarse resolution in seconds and nanoseconds format.

• rtems_clock_get_monotonic_coarse_bintime() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in coarse resolution in binary time format.

• rtems_clock_get_monotonic_coarse_timeval() - Gets the time elapsed since some fixed time point in the past measured using the CLOCK_MONOTONIC in coarse resolution in seconds and microseconds format.

• rtems_clock_get_boot_time() - Gets the time elapsed since the Unix epoch at some time point during system initialization in seconds and nanoseconds format.

• rtems_clock_get_boot_time_bintime() - Gets the time elapsed since the Unix epoch at some time point during system initialization in binary time format.

• rtems_clock_get_boot_time_timeval() - Gets the time elapsed since the Unix epoch at some time point during system initialization in seconds and microseconds format.

• rtems_clock_get_seconds_since_epoch() - Gets the seconds elapsed since the RTEMS epoch and the current CLOCK_REALTIME.

• rtems_clock_get_ticks_per_second() - Gets the number of clock ticks per second configured for the application.

• rtems_clock_get_ticks_since_boot() - Gets the number of clock ticks since some time point during the system initialization or the last overflow of the clock tick counter.

• rtems_clock_get_uptime() - Gets the seconds and nanoseconds elapsed since some time point during the system initialization using CLOCK_MONOTONIC.

• rtems_clock_get_uptime_timeval() - Gets the seconds and microseconds elapsed since some time point during the system initialization using CLOCK_MONOTONIC.

• rtems_clock_get_uptime_seconds() - Gets the seconds elapsed since some time point during the system initialization using CLOCK_MONOTONIC.

• rtems_clock_get_uptime_nanoseconds() - Gets the nanoseconds elapsed since some time point during the system initialization using CLOCK_MONOTONIC.

• rtems_clock_tick_later() - Gets a clock tick value which is at least delta clock ticks in the future.

• rtems_clock_tick_later_usec() - Gets a clock tick value which is at least delta microseconds in the future.

• rtems_clock_tick_before() - Indicates if the current clock tick counter is before the ticks.