timer.h

/*
 * Copyright (C) 2011 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 _XENOMAI_ALCHEMY_TIMER_H
#define _XENOMAI_ALCHEMY_TIMER_H
 
#include <stddef.h>
#include <copperplate/clockobj.h>
 
typedef ticks_t RTIME;
 
typedef sticks_t SRTIME;
 
#define TM_INFINITE  0
#define TM_NOW       0
#define TM_NONBLOCK  ((RTIME)-1ULL)
 
typedef struct rt_timer_info {
        RTIME period;
        RTIME date;
} RT_TIMER_INFO;
 
extern struct clockobj alchemy_clock;
 
#define alchemy_abs_timeout(__t, __ts)                                  \
        ({                                                              \
                (__t) == TM_INFINITE ? NULL :                           \
                (__t) == TM_NONBLOCK ?                                  \
                ({ (__ts)->tv_sec = (__ts)->tv_nsec = 0; (__ts); }) :   \
                ({ clockobj_ticks_to_timespec(&alchemy_clock, (__t), (__ts)); \
                        (__ts); });                                     \
        })
 
#define alchemy_rel_timeout(__t, __ts)                                  \
        ({                                                              \
                (__t) == TM_INFINITE ? NULL :                           \
                (__t) == TM_NONBLOCK ?                                  \
                ({ (__ts)->tv_sec = (__ts)->tv_nsec = 0; (__ts); }) :   \
                ({ clockobj_ticks_to_timeout(&alchemy_clock, (__t), (__ts)); \
                        (__ts); });                                     \
        })
 
static inline
int alchemy_poll_mode(const struct timespec *abs_timeout)
{
        return abs_timeout &&
                abs_timeout->tv_sec == 0 &&
                abs_timeout->tv_nsec == 0;
}
 
#ifdef __cplusplus
extern "C" {
#endif
 
static inline RTIME rt_timer_read(void)
{
        return clockobj_get_time(&alchemy_clock);
}
 
SRTIME rt_timer_ns2ticks(SRTIME ns);
 
SRTIME rt_timer_ticks2ns(SRTIME ticks);
 
RTIME rt_timer_read(void);
 
void rt_timer_inquire(RT_TIMER_INFO *info);
 
void rt_timer_spin(RTIME ns);
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ALCHEMY_TIMER_H */