The pthread_barrierattr_setpshared( ) function shall set the process-shared attribute in an initialized attributes object referenced by attr. The pthread_barrierattr_setpshared( ) function may fail if: [EINVAL] The new value specified for the process-shared attribute is not one of the legal values PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE. These functions shall not return an error code of [EINTR]. If successful, the pthread_barrierattr_setpshared( ) function shall return zero; otherwise, an error number shall be returned to indicate the error.