11-02-2007
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
I am working closly with unix message queues i have encountered the following -
after creating the Q and start working with it (pushing & pulling) i receive the following stange parameters on the q's -
STIME=no_entry
Qnum=0
CBYTES=4140
when this happens, the Q is disabled (meaning i... (3 Replies)
Discussion started by: kel
3 Replies
2. Programming
Hi there:
Thanks first. When I use a message queue amony severl processes, will I have to synchronize the queue? I don't think I would have to because a message queue is implemented in a link listed. Correct me If I am wrong... (0 Replies)
Discussion started by: yanhu
0 Replies
3. Programming
hi all,
I'm working on this problem for 2 days. Can somebody tell me that how to delete all message queues from the system ?
Since "ipcs -q" gives the list of all existing message queue, then there must be a system call and data stucture where from I can fetch the data about all existing... (2 Replies)
Discussion started by: v_rathor
2 Replies
4. Programming
Is there any way one can delete , say , a particular message from a message queue on system V? (2 Replies)
Discussion started by: satansfury
2 Replies
5. IP Networking
I am sending and retriving the message to the queue
the problem is
after retrieving the message can i see what is there in my message queue.
(actually in my application i am encountring some garbage value)
so i want to retieve this garbage value and also want to know its size
how... (0 Replies)
Discussion started by: ramneek
0 Replies
6. Programming
hi all...
ive been trying this program where i spawn 4 threads... and i am trying to use message queue to send msgs from 3 of the threads to the parent thread... but it doent seem to be working... ive almost pulled out my hair tryin to fix the prob :confused:
another wierd thing... (1 Reply)
Discussion started by: strider
1 Replies
7. Programming
Hii can anyone pls tell how to limit the max no of message in a posix message queue. I have made changes in proc/sys/fs/mqueue/msg_max
But still whenever i try to read the value of max. message in the queue using attr.mq_curmsgs (where struct mq_attr attr) its giving the default value as 10.... (0 Replies)
Discussion started by: mohit3884
0 Replies
8. Programming
Hi all,
I need help about message queues, i have a server-client program that communicates each other via msg queue, firstly server opens its msg queue and waits for msg then client opens server msg queue and its own msg queue(for receiving msg from server,clients sends msg to server msg... (7 Replies)
Discussion started by: SaTYR
7 Replies
9. Programming
Hello !!!!! I have a simple question but i can't find the answer anywhere hope to meet it here.
Why it is a bad idea to pass pointers through message queues ?
Most structs i see all of their char types are arrays... Is it becase having pointers means we could possibily send wrong bytes ?
For... (2 Replies)
Discussion started by: qlyine
2 Replies
10. Ubuntu
Hello
How can I see the created message queues in the system? (4 Replies)
Discussion started by: xyzt
4 Replies
putbq(9F) Kernel Functions for Drivers putbq(9F)
NAME
putbq - place a message at the head of a queue
SYNOPSIS
#include <sys/stream.h>
int putbq(queue_t *q, mblk_t *bp);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the queue.
bp Pointer to the message block.
DESCRIPTION
putbq() places a message at the beginning of the appropriate section of the message queue. There are always sections for high priority and
ordinary messages. If other priority bands are used, each will have its own section of the queue, in priority band order, after high prior-
ity messages and before ordinary messages. putbq() can be used for ordinary, priority band, and high priority messages. However, unless
precautions are taken, using putbq() with a high priority message is likely to lead to an infinite loop of putting the message back on the
queue, being rescheduled, pulling it off, and putting it back on.
This function is usually called when bcanput(9F) or canput(9F) determines that the message cannot be passed on to the next stream compo-
nent. The flow control parameters are updated to reflect the change in the queue's status. If QNOENB is not set, the service routine is
enabled.
RETURN VALUES
putbq() returns 1 upon success and 0 upon failure.
Note - Upon failure, the caller should call freemsg(9F) to free the pointer to the message block.
CONTEXT
putbq() can be called from user or interrupt context.
EXAMPLES
See the bufcall(9F) function page for an example of putbq().
SEE ALSO
bcanput(9F), bufcall(9F), canput(9F), getq(9F), putq(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 28 Aug 2001 putbq(9F)