time.h

/*
 * Copyright (C) 2013 Philippe Gerum <rpm@xenomai.org>.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#ifndef _BOILERPLATE_TIME_H
#define _BOILERPLATE_TIME_H

#include <time.h>

typedef unsigned long long ticks_t;

typedef long long sticks_t;

#ifdef __cplusplus
extern "C" {
#endif

void timespec_sub(struct timespec *__restrict r,
                  const struct timespec *__restrict t1,
                  const struct timespec *__restrict t2);

void timespec_subs(struct timespec *__restrict r,
                   const struct timespec *__restrict t1,
                   sticks_t t2);

void timespec_add(struct timespec *__restrict r,
                  const struct timespec *__restrict t1,
                  const struct timespec *__restrict t2);

void timespec_adds(struct timespec *__restrict r,
                   const struct timespec *__restrict t1,
                   sticks_t t2);

void timespec_sets(struct timespec *__restrict r,
                   ticks_t ns);

#ifdef __cplusplus
}
#endif

static inline sticks_t timespec_scalar(const struct timespec *__restrict t)
{
        return t->tv_sec * 1000000000LL + t->tv_nsec;
}

static inline int __attribute__ ((always_inline))
timespec_before(const struct timespec *__restrict t1,
                const struct timespec *__restrict t2)
{
        if (t1->tv_sec < t2->tv_sec)
                return 1;

        if (t1->tv_sec == t2->tv_sec &&
            t1->tv_nsec < t2->tv_nsec)
                return 1;

        return 0;
}

static inline int __attribute__ ((always_inline))
timespec_before_or_same(const struct timespec *__restrict t1,
                        const struct timespec *__restrict t2)
{
        if (t1->tv_sec < t2->tv_sec)
                return 1;

        if (t1->tv_sec == t2->tv_sec &&
            t1->tv_nsec <= t2->tv_nsec)
                return 1;

        return 0;
}

static inline int __attribute__ ((always_inline))
timespec_after(const struct timespec *__restrict t1,
               const struct timespec *__restrict t2)
{
        return !timespec_before_or_same(t1, t2);
}

static inline int __attribute__ ((always_inline))
timespec_after_or_same(const struct timespec *__restrict t1,
                       const struct timespec *__restrict t2)
{
        return !timespec_before(t1, t2);
}

#endif /* _BOILERPLATE_TIME_H */