int main(int argc, char *argv[])
{
int c, flags;
mqd_t mqd;
flags = O_RDWR | O_CREAT;
while( (c = Getopt(argc, argv, "em:z:")) !=-1){/*Getopt命令行参数解析*/
switch(c){
case 'e':
flags |= O_EXCL;
break;
case 'm':
attr.mq_maxmsg = atol(optarg);
break;
case 'z':
attr.mq_msgsize = atol(optarg);
break;
}
}
if(optind != argc -1)
err_quit("usage； mqcreate [-e] [-m maxmsg -z msgsize] <name>");
if((attr.mq_maxmsg != 0 && attr.mq_msgsize == 0) ||
(attr.mq_maxmsg == 0 && attr.mq_msgsize != 0))
err_quit("must specify both -m maxmsg and -z msgszie");
mqd = Mq_open(argv[optind], flags, FILE_MODE, (attr.mq_maxmsg != 0)? &attr:NULL);
Mq_close(mqd);
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);
}
int
main(int argc, char **argv)
{
mqd_t mqd;
struct mq_attr attr;
if (argc != 2)
err_quit("usage: mqgetattr <name>");
mqd = Mq_open(argv[1], O_RDONLY);
Mq_getattr(mqd, &attr);
printf("max #msgs = %ld, max #bytes/msg = %ld, "
"#currently on queue = %ld\n",
attr.mq_maxmsg, attr.mq_msgsize, attr.mq_curmsgs);
Mq_close(mqd);
exit(0);
}
int
main(int argc, char **argv)
{
int c, flags;
mqd_t mqd;
flags = O_RDWR | O_CREAT;
while ( (c = Getopt(argc, argv, "em:z:")) != -1) {
switch (c) {
case 'e':
flags |= O_EXCL;
break;
case 'm':
attr.mq_maxmsg = atol(optarg);
break;
case 'z':
attr.mq_msgsize = atol(optarg);
break;
}
}
if (optind != argc - 1)
err_quit("usage: mqcreate [ -e ] [ -m maxmsg -z msgsize ] <name>");
if ((attr.mq_maxmsg != 0 && attr.mq_msgsize == 0) ||
(attr.mq_maxmsg == 0 && attr.mq_msgsize != 0))
err_quit("must specify both -m maxmsg and -z msgsize");
printf("about to sleep for 30 seconds before mq_open\n");
sleep(30);
mqd = Mq_open(argv[optind], flags, FILE_MODE,
(attr.mq_maxmsg != 0) ? &attr : NULL);
printf("mq_open OK, about to sleep for 30 more seconds\n");
sleep(30);
Mq_close(mqd);
exit(0);
}
