source: CIVL/examples/messagePassing/ring1.cvl@ b7bd088

/* Create nprocs processes.  Have them exchange data in a cycle.
 * Commandline example:
 *     civl verify -inputNPROCS=3 ring.cvl -simplify=false
 */
#include<civlc.h>
#include "mp_root.cvh"

void MPI_Process (int rank) {
  #include "mp_proc.cvh"
  $comm comm;

  comm  = $comm_create($here, COMM_WORLD, rank);
  double x=rank, y;
  send(&x, 1, (rank+1)%NPROCS, 0, comm);
  recv(&y, 1, (rank+NPROCS-1)%NPROCS, 0, comm);
  $assert(y==(rank+NPROCS-1)%NPROCS);
}