9 More Discussions You Might Find Interesting
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
1 Replies
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
1 Replies
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
1 Replies
4. Programming
hi
I am using posix functions such as mq_open, mq_close and including the mqueue.h. but its giving a linking error,"undefined reference to mq_open and mq_close".
it it that we have to link some library or so while compiling... plzzz help
Thanxs
Mohit (0 Replies)
Discussion started by: mohit3884
0 Replies
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)
Discussion started by: sukaam
2 Replies
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)
Discussion started by: mgchato
9 Replies
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)
Discussion started by: jalburger
2 Replies
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
2 Replies
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
2 Replies
insque(9r) insque(9r)
NAME
insque, remque - General: Add or remove an element from the queue
SYNOPSIS
struct generic_qheader {
struct generic_qheader *q_forw;
struct generic_qheader *q_back;
};
int insque(
struct generic_qheader *elem,
struct generic_qheader *pred ); int remque(
struct generic_qheader *elem );
ARGUMENTS
Specifies the address of the queue header that contains the element to be manipulated. Specifies the address of the queue header that con-
tains the element to precede the one specified by elem in the queue.
DESCRIPTION
The insque routine adds the element that the elem argument specifies to the queue. The routine inserts elem in the next position after pred
in the queue.
The remque routine removes the element that the elem argument specifies from the queue it is currently in.
Queues are built from doubly linked lists. Each element is linked into the queue through a queue header. All queue headers are of the
generic form struct generic_qheader. A given element may have multiple queue headers. This allows each element to be simultaneously linked
onto multiple queues.
Any driver routine that manipulates these queues must call an appropriate spl routine to ensure that the spl level is high enough to block
out any interrupts for other kernel modules that may access these queues.
RETURN VALUES
None
SEE ALSO
Routines: spl(9r)
insque(9r)
