12-18-2008
Shared memory giving wrong value
Hi ,
I am working on AIX 5.3 server.I have small program which stores the from database to a particaular shared memory.But while retreiving the valus from the same shared memory, i am getting wrong values.
Please help.....
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I am running HP-UX B.11.11.
I'm increasing a parameter for a database engine so that it uses more memory to buffer the disk drive (to speed up performance). I have over 5GB of memory not being used.
But when I try to start the DB with the increased buffer parameter I get told.
"Not... (1 Reply)
Discussion started by: cjcamaro
1 Replies
2. Shell Programming and Scripting
hi,
I have this script which gives me the result...
#! /usr/bin/sh
set -x
cd /home/managar
a=1
while true
do
if
then
echo " File log.txt exists in this directory "
exit 0
fi
echo " File has not arrived yes..."
sleep 3
let a=a+1
if
then (1 Reply)
Discussion started by: mgirinath
1 Replies
3. Programming
I need to create a shared library to access an in memory DB. The DB is not huge, but big enough to make it cumbersome to carry around in every single process using the shared library. Luckily, it is pretty static information, so I don't need to worry much about synchronizing the data between... (12 Replies)
Discussion started by: DreamWarrior
12 Replies
4. Programming
I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability.
Obviously, I'll have to worry about mutual exclusion. (0 Replies)
Discussion started by: otheus
0 Replies
5. UNIX for Dummies Questions & Answers
Hi all,
I have a problem with qwk command.
i have to check process status and for that i am using command
prstat -mvL 1 1
and it gives me the entire output
but when i use this command with awk like this:
prstat -mvL 1 1 | awk -F" " '{print $1,$15}'
to get first and 15th arguments.
... (3 Replies)
Discussion started by: usha rao
3 Replies
6. Shell Programming and Scripting
Hi all,
I have a problem with sort command.
i have a file which looks like this:
"file1
1073 java/4
1073 java/180
1073 java/170
1073 java/176
1073 java/167
1073 java/40
1073 java/33
1073 java/136
28988 java/76
28988 java/73
28988 java/48
28988 java/26"
and i want to sort... (8 Replies)
Discussion started by: usha rao
8 Replies
7. Shell Programming and Scripting
Hi All,
i have a file which have many fields delimited by ,(comma)
now i have to show only few fields and not all.
the sample text file looks like this:
TYPE=SERVICEEVENT, TIMESTAMP=05/06/2009 11:01:40 PM, HOST=sppwa634, APPLICATION=ASComp, FUNCTION=LimitsService, SOU... (8 Replies)
Discussion started by: usha rao
8 Replies
8. UNIX for Advanced & Expert Users
Hello,
I'm having a problem with xbindkeys giving the wrong mapping information, hence I can't get it work at all when trying new mappings from this machine.
From another computer, I have some definitions for xbindkeys (made with xbindkeys-config). These key codes work correctly on this... (0 Replies)
Discussion started by: Narnie
0 Replies
9. Programming
Hello.
I am new to this forum and I would like to ask for advice about low level POSIX programming.
I have to implement a POSIX compliant C shared library.
A file will have some variables and the shared library will have some functions which need those variables.
There is one special... (5 Replies)
Discussion started by: iamjag
5 Replies
10. Shell Programming and Scripting
I am trying to run following script in ksh on darwin 11.4.2:
freeSpace=2469606195
spaceNeeded=200
] && echo "no space" || echo "space available"
] && echo "no space" || echo "space available"
"-lt" is giving wrong answer as "no space" Whereas '<' works fine. When I change the freespace... (4 Replies)
Discussion started by: sabitha
4 Replies
shmem(5) File Formats Manual shmem(5)
NAME
shmem - enable or disable System V shared memory
DESCRIPTION
The tunable is obsolete. The System V IPC shared memory subsystem is always enabled.
Shared memory is an efficient InterProcess Communications (IPC) mechanism. One process creates a shared memory segment and attaches it to
its address space. Any processes looking to communicate with this process through the shared memory segment, then attach the shared memory
segment to their corresponding address spaces as well. Once attached, a process can read from or write to the segment depending on the
permissions specified while attaching it.
WARNINGS
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by HP.
SEE ALSO
shmmax(5), shmmni(5), shmseg(5).
Tunable Kernel Parameters shmem(5)