Function md_util_try

modules/md/md_util.c:1040–1080

/* try and retry for a while **********************************************************************/

apr_status_t md_util_try(md_util_try_fn *fn, void *baton, int ignore_errs, 
                         apr_interval_time_t timeout, apr_interval_time_t start_delay, 
                         apr_interval_time_t max_delay, int backoff)
{
    apr_status_t rv;
    apr_time_t now = apr_time_now();
    apr_time_t giveup = now + timeout;
    apr_interval_time_t nap_duration = start_delay? start_delay : apr_time_from_msec(100);
    apr_interval_time_t nap_max = max_delay? max_delay : apr_time_from_sec(10);
    apr_interval_time_t left;
    int i = 0;
    
    while (1) {
        if (APR_SUCCESS == (rv = fn(baton, i++))) {
            break;
        }
        else if (!APR_STATUS_IS_EAGAIN(rv) && !ignore_errs) {
            break;
        }
        
        now = apr_time_now();
        if (now > giveup) {
            rv = APR_TIMEUP;
            break;
        }
        
        left = giveup - now;
        if (nap_duration > left) {
            nap_duration = left;
        }
        if (nap_duration > nap_max) {
            nap_duration = nap_max;
        }
        
        apr_sleep(nap_duration);
        if (backoff) {
            nap_duration *= 2;
        } 
    }
    return rv;
}

/* execute process ********************************************************************************/