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1. Programming
I have a problem understanding the different scheduling queues (Ready Queue, I/O Queue, Job Queue) Can you please explain/illustrate/differentiate these queues to me? Thanks a lot guys.;) (1 Reply)
Discussion started by: zel2zel
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2. UNIX for Dummies Questions & Answers
can any body provide a tutorial that explains the concept of message queues in UNIX in great detail (1 Reply)
Discussion started by: asalman.qazi
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3. UNIX for Advanced & Expert Users
#include <sys/ipc.h>
#include <sys/msg.h>
int main()
{
int qid;
int t;
struct msgbuf mesg;
qid=msgget(IPC_PRIVATE,IPC_CREAT);
mesg.mtype=1L;
mesg.mtext=1;
t=msgsnd(qid,&mesg,1,0);
printf("%d",t);
}
the program prints -1 as the result of msgsnd ,which means that msgsnd doesn't... (1 Reply)
Discussion started by: tolkki
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4. BSD
Hi! Everybody%)
I got a question like this: Does my FreeBSD5.1 support Posix queues.
Thanks! (7 Replies)
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5. UNIX for Dummies Questions & Answers
let 3 processes a, b and c are sharing msgs using msg queues.process 'a' sending msg to 'c' and in turn 'c' send sthat msg to 'b'.if something happens to c how can 'a' and 'b' know that 'c' is not available?????? (2 Replies)
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6. Programming
Hi all,
I've been trying for hours to figure out how to turn my 2-program (one to send and one to receive) "chat system" using message queues, into a single program where each concurrent component (entity) will both send and receive messages. PLEASE give me a hand with this, I'm starting to... (9 Replies)
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7. Linux
RH 7.2
Are there any commands to check the print queue status? Something along the lines of AIX's "qchk"?
Thanks!! (2 Replies)
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8. UNIX for Advanced & Expert Users
Hi,
I submit some processes throught an at queue with the cmd at -q queue.
I can easily check the waiting process with atq. But how can I check running processes within a specific queue ?
Thanks,
Stef (2 Replies)
Discussion started by: stef
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9. UNIX for Dummies Questions & Answers
I have a print queue set up with the following options: remote, standard processing, Hostname=(A Windows 2000 Server), bsd print spooler. It takes about 1 minute to transfer a 100 kb file and it times out (downs the queue) on larger files. When tested on a different system at a different location... (2 Replies)
Discussion started by: Scottb7711
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MQ_CLOSE(3) Linux Programmer's Manual MQ_CLOSE(3)
NAME
mq_close - close a message queue descriptor
SYNOPSIS
#include <mqueue.h>
int mq_close(mqd_t mqdes);
Link with -lrt.
DESCRIPTION
mq_close() closes the message queue descriptor mqdes.
If the calling process has attached a notification request (see (mq_notify(3)) to this message queue via mqdes, then this request is
removed, and another process can now attach a notification request.
RETURN VALUE
On success mq_close() returns 0; on error, -1 is returned, with errno set to indicate the error.
ERRORS
EBADF The message queue descriptor specified in mqdes is invalid.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+-----------+---------------+---------+
|Interface | Attribute | Value |
+-----------+---------------+---------+
|mq_close() | Thread safety | MT-Safe |
+-----------+---------------+---------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
All open message queues are automatically closed on process termination, or upon execve(2).
SEE ALSO
mq_getattr(3), mq_notify(3), mq_open(3), mq_receive(3), mq_send(3), mq_unlink(3), mq_overview(7)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 MQ_CLOSE(3)