/**
* @file rtems/rtems/clock.h
*
* This include file contains all the constants and structures associated
* with the Clock Manager. This manager provides facilities to set, obtain,
* and continually update the current date and time.
*
* This manager provides directives to:
*
* - set the current date and time
* - obtain the current date and time
* - set the nanoseconds since last clock tick handler
* - announce a clock tick
* - obtain the system uptime
*/
/* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#ifndef _RTEMS_RTEMS_CLOCK_H
#define _RTEMS_RTEMS_CLOCK_H
#include <rtems/score/tod.h>
#include <rtems/score/watchdog.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/types.h>
#include <sys/time.h> /* struct timeval */
/**
* @defgroup ClassicClock Clocks
*
* @ingroup ClassicRTEMS
*
* This encapsulates functionality which XXX
*/
/**@{*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* List of things which can be returned by the rtems_clock_get directive.
*/
typedef enum {
/** This value indicates obtain TOD in Classic API format. */
RTEMS_CLOCK_GET_TOD,
/** This value indicates obtain the number of seconds since the epoch. */
RTEMS_CLOCK_GET_SECONDS_SINCE_EPOCH,
/** This value indicates obtain the number of ticks since system boot. */
RTEMS_CLOCK_GET_TICKS_SINCE_BOOT,
/** This value indicates obtain the number of ticks per second. */
RTEMS_CLOCK_GET_TICKS_PER_SECOND,
/** This value indicates obtain the TOD in struct timeval format. */
RTEMS_CLOCK_GET_TIME_VALUE
} rtems_clock_get_options;
/**
* Type for the nanoseconds since last tick BSP extension.
*/
typedef Watchdog_Nanoseconds_since_last_tick_routine
rtems_nanoseconds_extension_routine;
/**
* @brief Obtain Current Time of Day
*
* This routine implements the rtems_clock_get directive. It returns
* one of the following:
* + current time of day
* + seconds since epoch
* + ticks since boot
* + ticks per second
*
* @param[in] option is the format of time to return
* @param[in] time_buffer points to the output area
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error.
*/
rtems_status_code rtems_clock_get(
rtems_clock_get_options option,
void *time_buffer
);
/**
* @brief Obtain Current Time of Day (Classic TOD)
*
* This routine implements the rtems_clock_get_tod directive. It returns
* the current time of day in the format defined by RTEID.
*
* @param[in] time_buffer points to the time of day structure
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error. If successful, the time_buffer will
* be filled in with the current time of day.
*/
rtems_status_code rtems_clock_get_tod(
rtems_time_of_day *time_buffer
);
/**
* @brief Obtain TOD in struct timeval Format
*
* This routine implements the rtems_clock_get_tod_timeval
* directive.
*
* @param[in] time points to the struct timeval variable to fill in
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error. If successful, the time will
* be filled in with the current time of day.
*/
rtems_status_code rtems_clock_get_tod_timeval(
struct timeval *time
);
/**
* @brief Obtain Seconds Since Epoch
*
* This routine implements the rtems_clock_get_seconds_since_epoch
* directive.
*
* @param[in] the_interval points to the interval variable to fill in
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error. If successful, the time_buffer will
* be filled in with the current time of day.
*/
rtems_status_code rtems_clock_get_seconds_since_epoch(
rtems_interval *the_interval
);
/**
* @brief Obtain Ticks Since Boot
*
* This routine implements the rtems_clock_get_ticks_since_boot
* directive.
*
* @return This method returns the number of ticks since boot. It cannot
* fail since RTEMS always keeps a running count of ticks since boot.
*/
rtems_interval rtems_clock_get_ticks_since_boot(void);
/**
* @brief Obtain Ticks Per Seconds
*
* This routine implements the rtems_clock_get_ticks_per_second
* directive.
*
* @return This method returns the number of ticks since boot. It cannot
* fail since RTEMS is always configured to know the number of
* ticks per second.
*/
rtems_interval rtems_clock_get_ticks_per_second(void);
/**
* @brief Set the Current TOD
*
* This routine implements the rtems_clock_set directive. It sets
* the current time of day to that in the time_buffer record.
*
* @param[in] time_buffer points to the new TOD
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error.
*
* @note Activities scheduled based upon the current time of day
* may be executed immediately if the time is moved forward.
*/
rtems_status_code rtems_clock_set(
const rtems_time_of_day *time_buffer
);
/**
* @brief Announce a Clock Tick
*
* This routine implements the rtems_clock_tick directive. It is invoked
* to inform RTEMS of the occurrence of a clock tick.
*
* @return This directive always returns RTEMS_SUCCESSFUL.
*
* @note This method is typically called from an ISR and is the basis
* for all timeouts and delays.
*/
rtems_status_code rtems_clock_tick( void );
/**
* @brief Set the BSP specific Nanoseconds Extension
*
* This directive sets the BSP provided nanoseconds since last tick
* extension.
*
* @param[in] routine is a pointer to the extension routine
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error.
*/
rtems_status_code rtems_clock_set_nanoseconds_extension(
rtems_nanoseconds_extension_routine routine
);
/**
* @brief Obtain the System Uptime
*
* This directive returns the system uptime.
*
* @param[in] uptime is a pointer to the time structure
*
* @return This method returns RTEMS_SUCCESSFUL if there was not an
* error. Otherwise, a status code is returned indicating the
* source of the error. If successful, the uptime will be
* filled in.
*/
rtems_status_code rtems_clock_get_uptime(
struct timespec *uptime
);
/**
* @brief _TOD_Validate
*
* This support function returns true if @a the_tod contains
* a valid time of day, and false otherwise.
*
* @param[in] the_tod is the TOD structure to validate
*
* @return This method returns true if the TOD is valid and false otherwise.
*/
bool _TOD_Validate(
const rtems_time_of_day *the_tod
);
/**
* @brief _TOD_To_seconds
*
* This function returns the number seconds between the epoch and @a the_tod.
*
* @param[in] the_tod is the TOD structure to convert to seconds
*
* @return This method returns the number of seconds since epoch represented
* by @a the_tod
*/
Watchdog_Interval _TOD_To_seconds(
const rtems_time_of_day *the_tod
);
#ifdef __cplusplus
}
#endif
/**@}*/
#endif
/* end of include file */
