POSIX Message Queue

POSIX Message Queue - Settings

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1. Programming

POSIX message queue mq_open directory

hello, I try to test the POSIX mq_open function on book unp like below: #include "unpipc.h" # include <mqueue.h> int main(int argc, char **argv) { int c, flags; mqd_t mqd; flags = O_RDWR | O_CREAT; while ((c = getopt(argc, argv, "e")) != -1) { ...

2. Programming

POSIX Message Queue Memory Allocation

Hi, I wanted to know whether the POSIX message queues are statically allocated memory by the kernel based on the parameters specified in the open or as and when we send messages, memory are allocated? Does the kernel reserve the specified memory for the message queue irrespective of whether...

3. Programming

Please help:program hang stuck there signal handling on POSIX Message Queue UNIX C programming

in a single main() function,so need signal handling. Use Posix Message Queue IPC mechanism , can ignore the priority and other linked list message,to implement the scenario: client:Knock Knock server:who's there client: Eric Server:Eric,Welcome. client:exit all process terminated ...

4. Programming

POSIX mq_receive issue: Message too long

Hello, I am trying to implement posix message queue application. I am faced with an error on the mq_receive section. It says "Message too long". I've tried couple of small tweeks, but to no result. Please do suggest any rectificaitons. mq_send section-works successfully #include...

5. Programming

UNIX Message Queue

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...

6. Programming

How to limit max no of message in a posix message queue

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....

7. Linux

POSIX message queue size

Hi all, Please tell me how to change POSIX message queue maximum size? "ulimit" is not a solution because it controls shell resources. But i need to control queue size before login in and starting the shell. It is needed to limit queue size for applications started before login in. Sorry for my...

8. Programming

message queue

Hello, i need to write a message queue "chat server", that should work only localy. Can anyone please help me with some ideas and peshaps code. I'm studying the UNIX IPC mechanisms right now. So far, i understand how it works but i still cannot get an idea how to write a chat programm... ...

9. HP-UX

posix ipc message queue

Hello, My question is related to "pipcs -qa" command under HP-UX 11i PA-RISC 64 bits. We have a little C program that creates posix ipc message queues using the mq_open() system function. The program fail with 'No space left on device' error when we create big queues. What is the system...

10. Programming

a message queue question..

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...

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queue.dequeue

Queue.dequeue(3kaya)					       Kaya module reference					      Queue.dequeue(3kaya)

NAME

       Queue::dequeue - Remove an item from a queue.

SYNOPSIS

       a dequeue( Queue<a>  q )

ARGUMENTS

       q The queue

DESCRIPTION

       Removes	the  front  item  from the queue, and returns the removed item. If the queue is empty, then the Queue.EmptyQueue(3kaya) exception
       will be thrown.

AUTHORS

       Kaya standard library by Edwin Brady, Chris Morris and others (kaya@kayalang.org). For further information see http://kayalang.org/

LICENSE

       The Kaya standard library is free software; you can redistribute it and/or modify it under the terms  of  the  GNU  Lesser  General  Public
       License (version 2.1 or any later version) as published by the Free Software Foundation.

RELATED

       Queue.array(3kaya)
       Queue.empty(3kaya)
       Queue.enqueue(3kaya)
       Queue.length(3kaya)

Kaya								   October 2012 					      Queue.dequeue(3kaya)

Programming