void
doit(mqd_t mqsend, mqd_t mqrecv)
{
char buff[MSGSIZE];
Mq_send(mqsend, buff, 1, 0);
if (Mq_receive(mqrecv, buff, MSGSIZE, NULL) != 1)
err_quit("mq_receive error");
}
/*
* =====================================================================
* Function:MsgQSend()
* Description: send a message to a message queue
* Input: msgQId -- msgQ id
* msgBuffer -- message to send
* msgLength -- length of the message to be sent
* timeTick -- wait time (in ticks)
* WAIT_FOREVER, this routine block until queue not full
* NO_WAIT, this routine return immediately with errorno
* wait time, this routine block until queue not full or time up
* msgPriority -- MSG_PRI_NORMAL or MSG_PRI_URGENT
* MSG_PRI_NORMAL(0) add the message to the tail of the queue
* MSG_PRI_URGENT(1) add the message to the head of the queue
* Output: N/A
* Return: OK on success or ERROR otherwise.
*======================================================================
*/
int MsgQSend(MSG_QUEUE_ID msgQId, const char* msgBuffer, int msgLength, int timeTick, int msgPriority)
{
#ifdef LINUX_OS
if (msgQId == AII_NULL || msgBuffer == AII_NULL)
{
return (-1);
}
return Mq_send((mqd_t)(*msgQId), msgBuffer, msgLength, timeTick, msgPriority);
#elif VXWORKS_OS
if (msgQId == AII_NULL || msgBuffer == AII_NULL)
{
return (-1);
}
return msgQSend(msgQId, msgBuffer, msgLength, timeTick, msgPriority);
#endif
}
int
main(int argc, char **argv)
{
mqd_t mqd;
void *ptr;
size_t len;
uint_t prio;
if (argc != 4)
err_quit("usage: mqsend <name> <#bytes> <priority>");
len = atoi(argv[2]);
prio = atoi(argv[3]);
mqd = Mq_open(argv[1], O_WRONLY);
ptr = Calloc(len, sizeof(char));
Mq_send(mqd, ptr, len, prio);
exit(0);
}
int
main(int argc, char **argv)
{
int i, nloop;
mqd_t mq1, mq2;
char buff[MSGSIZE];
pid_t childpid;
struct mq_attr attr;
if (argc != 2)
err_quit("usage: lat_pxmsg <#loops>");
nloop = atoi(argv[1]);
attr.mq_maxmsg = MAXMSG;
attr.mq_msgsize = MSGSIZE;
mq1 = Mq_open(Px_ipc_name(NAME1), O_RDWR | O_CREAT, FILE_MODE, &attr);
mq2 = Mq_open(Px_ipc_name(NAME2), O_RDWR | O_CREAT, FILE_MODE, &attr);
if ( (childpid = Fork()) == 0) {
for ( ; ; ) { /* child */
if (Mq_receive(mq1, buff, MSGSIZE, NULL) != 1)
err_quit("mq_receive error");
Mq_send(mq2, buff, 1, 0);
}
exit(0);
}
/* 4parent */
doit(mq1, mq2);
Start_time();
for (i = 0; i < nloop; i++)
doit(mq1, mq2);
printf("latency: %.3f usec\n", Stop_time() / nloop);
Kill(childpid, SIGTERM);
Mq_close(mq1);
Mq_close(mq2);
Mq_unlink(Px_ipc_name(NAME1));
Mq_unlink(Px_ipc_name(NAME2));
exit(0);
}