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/**
* @file rtems/score/timespec.h
*
* This include file contains helpers for manipulating timespecs.
*/
/*
* COPYRIGHT (c) 1989-2009.
* 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.
*/
#ifndef _RTEMS_SCORE_TIMESPEC_H
#define _RTEMS_SCORE_TIMESPEC_H
/**
* @defgroup Timespec Helpers
*
* @ingroup Score
*
* This handler encapsulates functionality related to manipulating
* POSIX struct timespecs.
*/
/**@{*/
#include <stdbool.h> /* bool */
#include <stdint.h> /* uint32_t */
#include <time.h> /* struct timespec */
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Set Timespec to Seconds Nanosecond
*
* This method sets the timespec to the specified seconds and nanoseconds
* value.
*
* @param[in] _time points to the timespec instance to validate.
* @param[in] _seconds is the seconds portion of the timespec
* @param[in] _nanoseconds is the nanoseconds portion of the timespec
*/
#define _Timespec_Set( _time, _seconds, _nanoseconds ) \
do { \
(_time)->tv_sec = (_seconds); \
(_time)->tv_nsec = (_nanoseconds); \
} while (0)
/**
* @brief Zero Timespec
*
* This method sets the timespec to zero.
* value.
*
* @param[in] _time points to the timespec instance to zero.
*/
#define _Timespec_Set_to_zero( _time ) \
do { \
(_time)->tv_sec = 0; \
(_time)->tv_nsec = 0; \
} while (0)
/**
* @brief Get Seconds Portion of Timespec
*
* This method returns the seconds portion of the specified timespec
*
* @param[in] _time points to the timespec
*
* @return The seconds portion of @a _time.
*/
#define _Timespec_Get_seconds( _time ) \
((_time)->tv_sec)
/**
* @brief Get Nanoseconds Portion of Timespec
*
* This method returns the nanoseconds portion of the specified timespec
*
* @param[in] _time points to the timespec
*
* @return The nanoseconds portion of @a _time.
*/
#define _Timespec_Get_nanoseconds( _time ) \
((_time)->tv_nsec)
/**
* @brief Is Timespec Valid
*
* This method determines the validity of a timespec.
*
* @param[in] time is the timespec instance to validate.
*
* @return This method returns true if @a time is valid and
* false otherwise.
*/
bool _Timespec_Is_valid(
const struct timespec *time
);
/**
* @brief Timespec Less Than Operator
*
* This method is the less than operator for timespecs.
*
* @param[in] lhs is the left hand side timespec
* @param[in] rhs is the right hand side timespec
*
* @return This method returns true if @a lhs is less than the @a rhs and
* false otherwise.
*/
bool _Timespec_Less_than(
const struct timespec *lhs,
const struct timespec *rhs
);
/**
* @brief Timespec Greater Than Operator
*
* This method is the greater than operator for timespecs.
*
* @param[in] lhs is the left hand side timespec
* @param[in] rhs is the right hand side timespec
*
* @return This method returns true if @a lhs is greater than the @a rhs and
* false otherwise.
*/
#define _Timespec_Greater_than( _lhs, _rhs ) \
_Timespec_Less_than( _rhs, _lhs )
/**
* @brief Timespec equal to Operator
*
* This method is the is equal to than operator for timespecs.
*
* @param[in] lhs is the left hand side timespec
* @param[in] rhs is the right hand side timespec
*
* @return This method returns true if @a lhs is equal to @a rhs and
* false otherwise.
*/
#define _Timespec_Equal_to( lhs, rhs ) \
( ((lhs)->tv_sec == (rhs)->tv_sec) && \
((lhs)->tv_nsec == (rhs)->tv_nsec) \
)
/**
* @brief Add to a Timespec
*
* This routine adds two timespecs. The second argument is added
* to the first.
*
* @param[in] time is the base time to be added to
* @param[in] add is the timespec to add to the first argument
*
* @return This method returns the number of seconds @a time increased by.
*/
uint32_t _Timespec_Add_to(
struct timespec *time,
const struct timespec *add
);
/**
* @brief Convert Timespec to Number of Ticks
*
* This routine convert the @a time timespec to the corresponding number
* of clock ticks.
*
* @param[in] time is the time to be converted
*
* @return This method returns the number of ticks computed.
*/
uint32_t _Timespec_To_ticks(
const struct timespec *time
);
/**
* @brief Convert Ticks to Timespec
*
* This routine converts the @a ticks value to the corresponding
* timespec format @a time.
*
* @param[in] time is the timespec format time result
* @param[in] ticks is the number of ticks to convert
*/
void _Timespec_From_ticks(
uint32_t ticks,
struct timespec *time
);
/**
* @brief Subtract Two Timespec
*
* This routine subtracts two timespecs. @a result is set to
* @a end - @a start.
*
* @param[in] start is the starting time
* @param[in] end is the ending time
* @param[in] result is the difference between starting and ending time.
*
* @return This method fills in @a result.
*/
void _Timespec_Subtract(
const struct timespec *start,
const struct timespec *end,
struct timespec *result
);
/**
* @brief Divide Timespec By Integer
*
* This routine divides a timespec by an integer value. The expected
* use is to assist in benchmark calculations where you typically
* divide a duration by a number of iterations.
*
* @param[in] time is the total
* @param[in] iterations is the number of iterations
* @param[in] result is the average time.
*
* @return This method fills in @a result.
*/
void _Timespec_Divide_by_integer(
const struct timespec *time,
uint32_t iterations,
struct timespec *result
);
/**
* @brief Divide Timespec
*
* This routine divides a timespec by another timespec. The
* intended use is for calculating percentages to three decimal points.
*
* @param[in] lhs is the left hand number
* @param[in] rhs is the right hand number
* @param[in] ival_percentage is the integer portion of the average
* @param[in] fval_percentage is the thousandths of percentage
*
* @return This method fills in @a result.
*/
void _Timespec_Divide(
const struct timespec *lhs,
const struct timespec *rhs,
uint32_t *ival_percentage,
uint32_t *fval_percentage
);
#ifdef __cplusplus
}
#endif
/**@}*/
#endif
/* end of include file */
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