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          OS_TCB   TaskY;
           
           
          void TaskX (void *p_arg)
          {
              OS_ERR      err;
              OS_SEM_CTR  ctr;
           
           
              while (DEF_ON) {
                  :
                  :
                  ctr = OSTaskSemSet(&TaskY,
                                      0,
                                     &err);
                  /* Check "err" */
                  :
                  :
              }
          }