source: CIVL/examples/library/civlc/commBad.cvl

/* Deadlocking use of communicator. Commandline execution:
 *              civl verify commBad.cvl
 * */
#include <civlc.cvh>
#include <comm.cvh>
#define TAG 0
$scope root = $here;
$gcomm gcomm = $gcomm_create(root, 2);
_Bool start = $false;

void worker(int me) {
  $comm comm = $comm_create($here, gcomm, me);
  $when (start);
  $comm_dequeue(comm, me, TAG);
}

void main() {
  $proc worker_proc = $spawn worker(0);
  
  start = $true;
  $wait(worker_proc);  
}