gistfile1.c

static inline bool should_roll(struct work *work)
{
        struct timeval now;
        time_t expiry;

        if (work->pool != current_pool() && pool_strategy != POOL_LOADBALANCE && pool_strategy != POOL_BALANCE)
                return false;

        if (work->rolltime > opt_scantime)
                expiry = work->rolltime;
        else
                expiry = opt_scantime;
        expiry = expiry * 2 / 3;

        /* We shouldn't roll if we're unlikely to get one shares' duration
         * work out of doing so */
        cgtime(&now);
        if (now.tv_sec - work->tv_staged.tv_sec > expiry)
                return false;

        return true;
}

/* Limit rolls to 7000 to not beyond 2 hours in the future where bitcoind will
 * reject blocks as invalid. */
static inline bool can_roll(struct work *work)
{
        return (!work->stratum && work->pool && work->rolltime && !work->clone &&
                work->rolls < 7000 && !stale_work(work, false));
}