05-18-2009
Interprocess Communication
Hiya Everybody just joined,
Not sure if this is the right section
I require abit of an assistance with IPC!
I know there are different types of IPC porcesses like signals, semaphores, mutexes, shared memory, message queues, pipes and sockets.
Now say a system has a number of interrelated processes where
- one interacts with a user,
- one gathers data from a rotating machin,
- one controls its speed and
- another logs data to disk.
So, therefore which IPC would I require for the above and what method will I need to emply.
Thanks you!
8 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I'm very worried. I have an assignment that is due in 3 weeks, and also tute exercises which I can't seem to understand and work out.
Okay, the question:
The parent process will convert the command arguments into integer values using atoi() and store them into an integer array which you will... (2 Replies)
Discussion started by: scmay
2 Replies
2. UNIX for Advanced & Expert Users
Earlier I posted a question regarding this issue. I managed to go a step further. Anyway, this is another similar question
Write a programme that creates a ring of three processes connected by pipes. The first process should prompt the user for a string and then send it to the second process .... (2 Replies)
Discussion started by: scmay
2 Replies
3. UNIX for Advanced & Expert Users
hello gurus,
I was wondering if someone would help me shed more light on this command.
What I know so far is
ipcs - stands for inter-process communication status and it reports on the following types of system resources.
1) Message queues
2) Shared memory and
3) Semaphores
Please explain... (4 Replies)
Discussion started by: jerardfjay
4 Replies
4. Solaris
Hi,
Can anyone suggest a Unix command or c-shell algorithm to simulate to behavior of "wall" command minus the "all users"? What I'm trying to do is to send a notice to just one particular user but i dont want other remotely-logged-on users to receive the message (on the pseudo-terminals). I... (3 Replies)
Discussion started by: Deanne
3 Replies
5. HP-UX
HI ALL,
I have been trying to install a particular software using remote linux server.
some thing like this:
rsh <host ID> /usr/sbin/swinstall -x autoreboot=true -s /tmp/<software> <Product name>.
The problem is whenever I try to install the product through a shell script the installation... (1 Reply)
Discussion started by: barun agarwal
1 Replies
6. AIX
hello
i'v two aix servers 4.3. last night the goes down becuse electrical f
problems.
when the servers comes up i've notice that file /unix is gone. i've fix it and the problem fixed.
after few hours the same crash becuse elctrical problems.
file /unix is there , but now i've a... (0 Replies)
Discussion started by: ariec
0 Replies
7. Cybersecurity
Hey GUys,
Once again I run in to problem and I am here for ur help.
I have two sun(solaris) box on company LAN.
One Unix Box is behind the firewall and the other one is Outside the firewall. The thing i need to do is
remote display a graphic on Unix box outside the firewall to the Unixbox... (5 Replies)
Discussion started by: ajnabi
5 Replies
8. Shell Programming and Scripting
Greetings,
I'm posting this in the shell scripting forum because I'm hoping this can be done in BASH or PERL. If not, I'm still open to suggestions of other ways to do it:
I've got an iPhone app that's sending some encrypted (SSL) traffic to a server and I'd like to be able to read the... (0 Replies)
Discussion started by: FiZiX
0 Replies
LEARN ABOUT DEBIAN
string::parity
Parity(3) User Contributed Perl Documentation Parity(3)
NAME
String::Parity, setEvenParity, setOddParity, setSpaceParity, setMarkParity, isEvenParity, isOddParity isSpaceParity, isMarkParity, Even-
Bytes, OddBytes, SpaceBytes, MarkBytes, showParity, showMarkSpace - Parity (odd/even/mark/space) handling functions
SYNOPSIS
use String::Parity;
use String::Parity qw(:DEFAULT /show/);
DESCRIPTION
setEvenParity LIST
Copies the elements of LIST to a new list and converts the new elements to strings of bytes with even parity. In array context
returns the new list. In scalar context joins the elements of the new list into a single string and returns the string.
setOddParity LIST
Like setEvenParity function, but converts to strings with odd parity.
setSpaceParity LIST
Like setEvenParity function, but converts to strings with space (High bit cleared) parity.
setMarkParity LIST
Like setEvenParity function, but converts to strings with mark (High bit set) parity.
EvenBytes LIST
Returns the number of even parity bytes in the elements of LIST.
OddBytes LIST
Returns the number of odd parity bytes in the elements of LIST.
SpaceBytes LIST
Returns the number of space parity bytes in the elements of LIST.
MarkBytes LIST
Returns the number of mark parity bytes in the elements of LIST.
isEvenParity LIST
Returns TRUE if the LIST contains no byte with odd parity, FALSE otherwise.
isOddParity LIST
Returns TRUE if the LIST contains no byte with even parity, FALSE otherwise.
isSpaceParity LIST
Returns TRUE if the LIST contains no byte with mark parity, FALSE otherwise.
isMarkParity LIST
Returns TRUE if the LIST contains no byte with space parity, FALSE otherwise.
showParity LIST
Like setEvenParity function, but converts bytes with even parity to 'e' and other bytes to 'o'. The function showParity must be
imported by a specialised import list.
showMarkSpace LIST
Like setEvenParity function, but converts bytes with space parity to 's' and other bytes to 'm'. The function showMarkSpace must
be imported by a specialised import list.
NOTES
Don't use this module unless you have to communicate with some old device or protocol. Please make your application 8 bit clean and use the
internationally standardised ISO-8859-1 character set.
AUTHOR
Winfried Koenig <win@in.rhein-main.de>
SEE ALSO
perl(1), Exporter(1)
perl v5.8.0 1996-12-10 Parity(3)