XBT_DEBUG("\tUpdate constraint %p (%g) by %g", cnst, cnst->remaining, cnst->usage);
double_update(&(cnst->remaining), cnst->usage, sg_maxmin_precision);
XBT_DEBUG("\tUpdate constraint %p (%g) by %g", cnst, cnst->remaining, cnst->usage);
double_update(&(cnst->remaining), cnst->usage, sg_maxmin_precision);