*   int p4_initenv();
*   int p4_create_procgroup();
*   int p4_wait_for_end();

*   int p4_get_my_id();
*   int p4_num_total_ids();

*   int p4_get_my_cluster_id();
*   int p4_num_cluster_ids();
*   VOID p4_get_cluster_ids():

*   int p4_broadcast();
*   int p4_broadcastx();
*   int p4_send();
*   int p4_sendx();
*   int p4_sendr();
*   int p4_sendrx();
*   BOOL p4_messages_available();
*   int p4_recv();
    int p4_global_op();

*   int p4_clock();
*   int p4_ustimer();
*   char *p4_version();

*   int p4_soft_errors();
*   VOID p4_error();
