125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
/**
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* \file time.h
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* License details are found in the file LICENSE.
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* \brief
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* Format of time variables
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* \author Taku Shimosawa <shimosawa@is.s.u-tokyo.ac.jp> \par
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* Copyright (C) 2011 - 2012 Taku Shimosawa
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*/
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/*
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* HISTORY
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*/
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/*
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* time.h:
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*
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* excerpted from the cross-compiler's header folder
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*/
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#ifndef __TIME_H
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#define __TIME_H
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#define NS_PER_SEC 1000000000UL
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 1
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#define CLOCK_PROCESS_CPUTIME_ID 2
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#define CLOCK_THREAD_CPUTIME_ID 3
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typedef long int __time_t;
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/* POSIX.1b structure for a time value. This is like a `struct timeval' but
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has nanoseconds instead of microseconds. */
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struct timespec
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{
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__time_t tv_sec; /* Seconds. */
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long int tv_nsec; /* Nanoseconds. */
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};
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/* A time value that is accurate to the nearest
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microsecond but also has a range of years. */
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struct timeval
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{
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__time_t tv_sec; /* Seconds. */
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long tv_usec; /* Microseconds. */
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};
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/* Structure crudely representing a timezone.
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This is obsolete and should never be used. */
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struct timezone
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{
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int tz_minuteswest; /* Minutes west of GMT. */
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int tz_dsttime; /* Nonzero if DST is ever in effect. */
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};
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#define ITIMER_REAL 0
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#define ITIMER_VIRTUAL 1
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#define ITIMER_PROF 2
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struct itimerval {
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struct timeval it_interval;
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struct timeval it_value;
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};
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static inline void
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ts_add(struct timespec *ats, const struct timespec *bts)
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{
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ats->tv_sec += bts->tv_sec;
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ats->tv_nsec += bts->tv_nsec;
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while(ats->tv_nsec >= 1000000000){
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ats->tv_sec++;
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ats->tv_nsec -= 1000000000;
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}
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}
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static inline void
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ts_sub(struct timespec *ats, const struct timespec *bts)
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{
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ats->tv_sec -= bts->tv_sec;
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ats->tv_nsec -= bts->tv_nsec;
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while(ats->tv_nsec < 0){
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ats->tv_sec--;
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ats->tv_nsec += 1000000000;
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}
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}
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static inline void
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tv_add(struct timeval *ats, const struct timeval *bts)
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{
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ats->tv_sec += bts->tv_sec;
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ats->tv_usec += bts->tv_usec;
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while(ats->tv_usec >= 1000000){
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ats->tv_sec++;
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ats->tv_usec -= 1000000;
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}
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}
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static inline void
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tv_sub(struct timeval *ats, const struct timeval *bts)
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{
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ats->tv_sec -= bts->tv_sec;
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ats->tv_usec -= bts->tv_usec;
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while(ats->tv_usec < 0){
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ats->tv_sec--;
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ats->tv_usec += 1000000;
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}
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}
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static inline void
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tv_to_ts(struct timespec *ats, const struct timeval *bts)
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{
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ats->tv_sec = bts->tv_sec;
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ats->tv_nsec = bts->tv_usec * 1000;
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}
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static inline void
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ts_to_tv(struct timeval *ats, const struct timespec *bts)
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{
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ats->tv_sec = bts->tv_sec;
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ats->tv_usec = bts->tv_nsec / 1000;
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}
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#endif // __TIME_H
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