/*
  * Copyright (C) yajin 2008<yajinzhou@gmail.com >
  *     
  * This file is part of the virtualmips distribution. 
  * See LICENSE file for terms of the license. 
  *
  */

#include <stdlib.h>
#include <string.h>
#include "utils.h"
#include "vp_clock.h"

static int use_rt_clock;
vp_clock_t *rt_clock;
vp_clock_t *vm_clock;

void init_get_clock (void)
{
    use_rt_clock = 0;
#if defined(__linux__)
    {
        struct timespec ts;
        if (clock_gettime (CLOCK_MONOTONIC, &ts) == 0) {
            use_rt_clock = 1;
        }
    }
#endif
}

/*ns*/
static m_int64_t get_clock (void)
{
#if defined(__linux__)
    if (use_rt_clock) {
        struct timespec ts;
        clock_gettime (CLOCK_MONOTONIC, &ts);
        return ts.tv_sec * 1000000000LL + ts.tv_nsec;
    } else
#endif
    {
        /* XXX: using gettimeofday leads to problems if the date
         * changes, so it should be avoided. */
        struct timeval tv;
        gettimeofday (&tv, NULL);
        return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);
    }
}

/*ms*/
m_int64_t vp_get_clock (vp_clock_t * clock)
{
    switch (clock->type) {
    case VP_TIMER_REALTIME:
        return get_clock () / 1000000;
    default:
    case VP_TIMER_VIRTUAL:
        ASSERT (0, "not support yet\n");
    }
    return 0;
}

vp_clock_t *vp_new_clock (int type)
{
    vp_clock_t *clock;
    clock = malloc (sizeof (vp_clock_t));
    memset (clock, 0x0, sizeof (*clock));
    if (!clock)
        return NULL;
    clock->type = type;
    return clock;
}