Archipelago » qemu

/***********************************************************/

/* real time host monotonic timer */

static int64_t get_clock_realtime(void)

{

    struct timeval tv;

    gettimeofday(&tv, NULL);

    return tv.tv_sec * 1000000000LL + (tv.tv_usec * 1000);

}

#ifdef WIN32

static int64_t clock_freq;

static void init_get_clock(void)

{

    LARGE_INTEGER freq;

    int ret;

    ret = QueryPerformanceFrequency(&freq);

    if (ret == 0) {

        fprintf(stderr, "Could not calibrate ticks\n");

        exit(1);

    }

    clock_freq = freq.QuadPart;

}

static int64_t get_clock(void)

{

    LARGE_INTEGER ti;

    QueryPerformanceCounter(&ti);

    return muldiv64(ti.QuadPart, get_ticks_per_sec(), clock_freq);

}

#else

static int use_rt_clock;

static void init_get_clock(void)

{

    use_rt_clock = 0;

#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \

    || defined(__DragonFly__) || defined(__FreeBSD_kernel__)

    {

        struct timespec ts;

        if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {

            use_rt_clock = 1;

        }

    }

#endif

}

static int64_t get_clock(void)

{

#if defined(__linux__) || (defined(__FreeBSD__) && __FreeBSD_version >= 500000) \

	|| defined(__DragonFly__) || defined(__FreeBSD_kernel__)

    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. */

        return get_clock_realtime();

    }

}

#endif

    init_get_clock();