05-01-2007
Quote:
Originally Posted by elzalem
i have 2 linked lists that are constantly growing or shrinking, both r visible to all processes, i don't want each process to have a copy, i hope you're understanding what i mean.
without "shared memory" is it possible?
... and the moon on a stick presumably?
You can share it in memory or have another server process that contains the list and all other processes use some form of IPC or RPC to access.
You can't share something by not sharing it.
Last edited by porter; 05-01-2007 at 07:26 PM..
10 More Discussions You Might Find Interesting
1. Programming
Dear Reader,
Is is necessary to attach / dettach the shared memory segments for write operations , if more than one program is accessing same shared memory segments..
I have used semaphore mutex and still I'm getting segmentation fault when I write to the segment when other program is already... (1 Reply)
Discussion started by: joseph_shibu
1 Replies
2. 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
3. UNIX for Advanced & Expert Users
Between mmap and shared memory which is the best method of sharing data between multiple applications, interms of speed? (2 Replies)
Discussion started by: nmds
2 Replies
4. Linux
Hi all :confused: ,
I am new to unix.I have been asked to implement shared memory in user's mode.What does this mean?What is the difference it makes in kernel mode and in users mode?What are the advantages of this impemenation(user's mode)?
And also i would like to know why exactly shared... (0 Replies)
Discussion started by: vijaya2006
0 Replies
5. 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
6. 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
7. UNIX for Advanced & Expert Users
Hi,
Using ipcs we can see shared memory, etc.. details. How can I add/remove shared memory(command name)?
Thanks,
Naga:cool: (2 Replies)
Discussion started by: Nagapandi
2 Replies
8. AIX
1.How to know wich process is using the shared memory?
2.How to flush (release) the process from the shared memory? (1 Reply)
Discussion started by: pchangba
1 Replies
9. 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
1 Replies
10. 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
LEARN ABOUT DEBIAN
smlistsh
SMLISTSH(1) ICI executables SMLISTSH(1)
NAME
smlistsh - shared-memory linked list test shell
SYNOPSIS
smlistsh partition_size
DESCRIPTION
smlistsh attaches to a region of system memory (allocating it if necessary, and placing it under PSM management as necessary) and offers
the user an interactive "shell" for testing various shared-memory linked list management functions.
smlistsh prints a prompt string (": ") to stdout, accepts a command from stdin, executes the command (possibly printing a diagnostic
message), then prints another prompt string and so on.
The following commands are supported:
h The help command. Causes smlistsh to print a summary of available commands. Same effect as the ? command.
? Another help command. Causes smlistsh to print a summary of available commands. Same effect as the h command.
k The key command. Computes and prints an unused shared-memory key, for possible use in attaching to a shared-memory region.
+ key_value size
The attach command. Attaches smlistsh to a region of shared memory. key_value identifies an existing shared-memory region, in the
event that you want to attach to an existing shared-memory region (possibly created by another smlistsh process running on the same
computer). To create and attach to a new shared-memory region that other processes can attach to, use a key_value as returned by the
key command and supply the size of the new region. If you want to create and attach to a new shared-memory region that is for strictly
private use, use -1 as key and supply the size of the new region.
- The detach command. Detaches smlistsh from the region of shared memory it is currently using, but does not free any memory.
n The new command. Creates a new shared-memory list to operate on, within the currently attached shared-memory region. Prints the
address of the list.
s list_address
The share command. Selects an existing shared-memory list to operate on, within the currently attached shared-memory region.
a element_value
The append command. Appends a new list element, containing element_value, to the list on which smlistsh is currently operating.
p element_value
The prepend command. Prepends a new list element, containing element_value, to the list on which smlistsh is currently operating.
w The walk command. Prints the addresses and contents of all elements of the list on which smlistsh is currently operating.
f element_value
The find command. Finds the list element that contains element_value, within the list on which smlistsh is currently operating, and
prints the address of that list element.
d element_address
The delete command. Deletes the list element located at element_address.
r The report command. Prints a partition usage report, as per psm_report(3).
q The quit command. Detaches smlistsh from the region of shared memory it is currently using (without freeing any memory) and terminates
smlistsh.
EXIT STATUS
0 smlistsh has terminated.
FILES
No configuration files are needed.
ENVIRONMENT
No environment variables apply.
DIAGNOSTICS
No diagnostics apply.
BUGS
Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>
SEE ALSO
smlist(3)
perl v5.14.2 2012-05-25 SMLISTSH(1)