10 More Discussions You Might Find Interesting
1. 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
2. Programming
Hi everyone. I asked once here and it went well, so I'm very happy with this community.
I have a new question to ask. I would like to read&write specify memory of a process which is not the process I'm doing it from, nor a child nor a parent.
So, I want to do a program similar to Cheat... (3 Replies)
Discussion started by: lilezek
3 Replies
3. IP Networking
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Discussion started by: swatidas11
1 Replies
4. UNIX for Dummies Questions & Answers
I have created and attached a shared memory segment. However I do not know how am I supposed to write and read data from it. I want to save various different data on this segment such as process IDs and other. Do you know how am I supposed to write these and be able to read such data in the correct... (1 Reply)
Discussion started by: tyron
1 Replies
5. Programming
I have created a shared memory segment (which size is 64 bytes) using shmget, shmat e.t.c and i want to divide it into 2 areas. One area for input data and one area for output? How can i do that?
Furthermore, When i have to write my input data into the shared memory segment i want to write... (3 Replies)
Discussion started by: mae4
3 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. Programming
I am looking for C program source code. Could you please help me in finding the source code required mentioned below.
program to create multiple threads (one master thread and rest worker threads) and using the threads write into and read from shared memory
Restrictions:
Only one thread... (2 Replies)
Discussion started by: kumars
2 Replies
8. 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
9. 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;
struct node *next;
} node;
or i should send the items ( x,c ) by... (9 Replies)
Discussion started by: elzalem
9 Replies
10. 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
ipcrm(1) General Commands Manual ipcrm(1)
Name
ipcrm - remove a message queue, semaphore set
Syntax
ipcrm [options]
Description
The command removes one or more specified messages, semaphores or shared memory identifiers.
The details of the removes are described in and The identifiers and keys may be found by
Options
-q msqid Removes the message queue identifier msqid from the system and destroys the message queue and data structure associated
with it.
-m shmid Removes the shared memory identifier shmid from the system. The shared memory segment and data structure associated
with it are destroyed after the last detach.
-s semid Removes the semaphore identifier semid from the system and destroys the set of semaphores and data structure associated
with it.
-Q msgkey Removes the message queue identifier, created with key msgkey, from the system and destroys the message queue and data
structure associated with it.
-M shmkey Removes the shared memory identifier, created with key shmkey, from the system. The shared memory segment and data
structure associated with it are destroyed after the last detach.
-S semkey Removes the semaphore identifier, created with key semkey, from the system and destroys the set of semaphores and data
structure associated with it.
See Also
ipcs(1), msgctl(2), msgget(2), msgop(2), semctl(2), semget(2), semop(2), shmctl(2), shmget(2), shmop(2)
ipcrm(1)