source: trunk/libs/newlib/src/newlib/libc/sys/linux/sys/linux_time.h @ 444

#ifndef _LINUX_TIME_H
#define _LINUX_TIME_H

#include <asm/param.h>
#include <sys/types.h>

#ifndef _STRUCT_TIMESPEC
#define _STRUCT_TIMESPEC
struct timespec {
        time_t  tv_sec;         /* seconds */
        long    tv_nsec;        /* nanoseconds */
};
#endif /* _STRUCT_TIMESPEC */

/*
 * Change timeval to jiffies, trying to avoid the
 * most obvious overflows..
 *
 * And some not so obvious.
 *
 * Note that we don't want to return MAX_LONG, because
 * for various timeout reasons we often end up having
 * to wait "jiffies+1" in order to guarantee that we wait
 * at _least_ "jiffies" - so "jiffies+1" had better still
 * be positive.
 */
#define MAX_JIFFY_OFFSET ((~0UL >> 1)-1)

static __inline__ unsigned long
timespec_to_jiffies(struct timespec *value)
{
        unsigned long sec = value->tv_sec;
        long nsec = value->tv_nsec;

        if (sec >= (MAX_JIFFY_OFFSET / HZ))
                return MAX_JIFFY_OFFSET;
        nsec += 1000000000L / HZ - 1;
        nsec /= 1000000000L / HZ;
        return HZ * sec + nsec;
}

static __inline__ void
jiffies_to_timespec(unsigned long jiffies, struct timespec *value)
{
        value->tv_nsec = (jiffies % HZ) * (1000000000L / HZ);
        value->tv_sec = jiffies / HZ;
}
 
#ifndef _STRUCT_TIMEVAL
#define _STRUCT_TIMEVAL
struct timeval {
        time_t          tv_sec;         /* seconds */
        suseconds_t     tv_usec;        /* microseconds */
};
#endif

struct timezone {
        int     tz_minuteswest; /* minutes west of Greenwich */
        int     tz_dsttime;     /* type of dst correction */
};

#define ITIMER_REAL     0
#define ITIMER_VIRTUAL  1
#define ITIMER_PROF     2

struct  itimerspec {
        struct  timespec it_interval;    /* timer period */
        struct  timespec it_value;       /* timer expiration */
};

struct  itimerval {
        struct  timeval it_interval;    /* timer interval */
        struct  timeval it_value;       /* current value */
};

#endif