02-21-2005
i think that shared mem is the faster of the two. this question really belongs in the c programming category doesn't it?
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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
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2. Programming
Between mmap and shared memory which is the best method of sharing data between multiple applications, interms of speed? (1 Reply)
Discussion started by: nmds
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3. Programming
hi,
this is the problem: i want to swap a linked list between 4 processes (unrelated), is there any way i can do that just by sending a pointer to a structure?
//example
typedef struct node
{
int x;
char c;
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or i should send the items ( x,c ) by... (9 Replies)
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4. 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)
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5. 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
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6. Programming
Hello,
I wonder if I can write my userdefined data structures(ex: a list) to a shared memory segment?
I know, the shm functions get (void*) parameter so I should be able to read and write a list into the shared memory.
may someone inform and clarify me about that, please? (1 Reply)
Discussion started by: xyzt
1 Replies
7. Programming
Hey, Im using a shared memory segment to share a WINDOW structure among 2 processes. Basically I'm building a multi-player snake game in which multiple prrocesses access the window.
The 'parent' process initializes the shared memory segment and puts the window in it. I can access and perform... (1 Reply)
Discussion started by: dgre0018
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8. Programming
I'll try to keep this short, but basically I need to figure out a way to load data in shared memory (this file will be called load.c) I will later access the data with a print.c program.
The "data" is in the form of a student database that looks like this
John Blakeman
111223333
560... (7 Replies)
Discussion started by: Mercfh
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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
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CHCAT(8) User Commands CHCAT(8)
NAME
chcat - change file SELinux security category
SYNOPSIS
chcat category file...
chcat -l category user...
chcat [[+|-]category...] file...
chcat -l [[+|-]category...] user...
chcat [-d] file...
chcat -l [-d] user...
chcat -L [ -l ] [ user ... ]
DESCRIPTION
Change/Remove the security category for each file or user.
Use +/- to add/remove categories from a file or user.
Note: When removing a category you must specify '--' on the command line before using the -Category syntax. This tells the command that
you have finished entering options and are now specifying a category name instead.
-d delete the category from each FILE/USER.
-L list available categories.
-l Tells chcat to operate on users instead of files.
SEE ALSO
chcon(1), selinux(8), semanage(8)
When operating on files this script wraps the chcon command.
FILES
/etc/selinux/{SELINUXTYPE}/setrans.conf
/etc/selinux/{SELINUXTYPE}/seusers
chcat September 2005 CHCAT(8)