source: CIVL/mods/dev.civl.com/examples/languageFeatures/yieldTest/local_and_yield.cvl@ cb4d4f4

/*  Threads t0 and t1 are all wrapped in $local_begin and $local_end.
    With $yield, both interleaves: t0 first then t1 and the other way
    around will be explored by CIVL.  Hence the assertion violation
    will be found.
 */

int x = -1;

void thread(int tid) {
  $local_start();
  $yield();
  x = tid;
  $local_end();
}

int main() {
  $parfor (int i : 0 .. 1)
    thread(i);
  $assert(x == 1);
}