MLReadyParallel()

#include "mathlink.h"

/* read data from either of two links */

void f(MLENV env, MLINK lp1, MLINK lp2)
{
    mltimeval timeout;
    MLINK links[2];
    int result;

    timeout.tv_sec = 5;
    timeout.tv_usec = 0;

    links[0] = lp1;
    links[1] = lp2;

    result = MLReadyParallel(env, (MLINK *)links, 2, timeout);
    if(result == MLREADYPARALLELERROR)
        { /* unable to check links for data */ }
    else if(result != MLREADYPARALLELTIMEDOUT)
        {
            /* read the link that has data ready */
            if(result == 0)
                /* read lp1 */
            else
                /* read lp2 */
        }
}