check_field
if (!check_field("type", &attr, pthread_mutexattr_gettype,
if (!check_field("shared", &attr, pthread_mutexattr_getpshared,
if (!check_field("priority ceiling", &attr,
if (!check_field("protocol", &attr, pthread_mutexattr_getprotocol,
if (!check_field("robust", &attr, pthread_mutexattr_getrobust,