pthread_barrierattr_setpshared
int pthread_barrierattr_setpshared(pthread_barrierattr_t *, int);
PROTO_STD_DEPRECATED(pthread_barrierattr_setpshared);
CHECKr(pthread_barrierattr_setpshared(&attr, i));
_CHECK(pthread_barrierattr_setpshared(&attr, PTHREAD_PROCESS_SHARED), == ENOTSUP, strerror(_x));