mmap

Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
# 1  
Data mmap

I want to know whether this is possile or ever been tried out.

I want to obtain a chuck of memory using mmap()

I do it so :

Code:
n = mmap(0, 8000, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);

And hold on to that memory, when a process requests for memory, some memory is assigned from this chunk.

In Linux is it possible to control where the new process gets it's memory from? Can i create a process that will only get memory from the chunk of memory i reserved?
# 2  
Yes, you can allocate memory in one process and expose it to other processes. It is called shared memory. No, you cannot force another new process to use exclusively the memory you decide to give it.

All of this seems a little odd. You can cause yourself a lot of issues doing something like the above. What are you trying to accomplish, NOT what you think you should to do?
# 3  
What the actual problem is that, there is an application that needs quite some amount of memory to run.

However, it does not get so much as our board is running low on memory. So we were thinking to reserve some memory and create a program that acts as a memory manager and assign that application memory when in demand. Else it will be in waiting most of the time.

If i could get a small prototype that would suffice.
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

10 More Discussions You Might Find Interesting

1. BSD

Mmap source

I'm new to kernels and C, and I am tinkering around trying to understand OpenBSD's secure memory management. I'm stumped on a couple points. I've read up on malloc() which was apparently modified years ago to allocate memory using mmap. First question, that would be this here, right? ... (4 Replies)
Discussion started by: dcicc
4 Replies

2. UNIX for Advanced & Expert Users

Regarding MMAP, MLOCK etc..

Hi I want to lock or prevent a portion of memory which I allocated. So I tried MLOCK, MPROTECT and some like this. But all these functions works only on page border. Can I know why that so. Is that possible to protect a portion of memory which is in middle of the page. Example. int A; ... (1 Reply)
Discussion started by: jionnet
1 Replies

3. Programming

mmap

hai, How do we map 'n' number of files into memory by using mmap system call?? Thanks in advance...... (5 Replies)
Discussion started by: andrew.paul
5 Replies

4. Homework & Coursework Questions

mmap

Descriptions: Develop a program that uses mmap() to map a file to memory space. Prepare such a file by yourself and do the follows. <LI class=MsoNormal>Display the content of the file after mapping; <LI class=MsoNormal>Output how many digits included in the file; <LI class=MsoNormal>Replace... (1 Reply)
Discussion started by: gokult
1 Replies

5. Programming

mmap()

how to use mmap() to map a file to memory space. Do you have any simple program???? Because I have to implement lot of concepts into it. (5 Replies)
Discussion started by: gokult
5 Replies

6. UNIX for Dummies Questions & Answers

mmap()

how to use mmap() to map a file to memory space. Do you have any simple program???? Because I have to implement lot of concepts into it. (3 Replies)
Discussion started by: gokult
3 Replies

7. Solaris

mmap() on 64 bit m/c

Dear Experts, i have a problem related to mmap(), when i run my program on sun for 64 bit which is throwing SIGBUS when it encounters mmap() function, what is the reason how to resolve this one, because it is working for 32 bit. with regards, vidya. (2 Replies)
Discussion started by: vin_pll
2 Replies

8. UNIX for Advanced & Expert Users

mmap and select

I'm using select() to monitor multiple file descriptors (inet sockets) in application. But this application must also collaborate with other applications on the same host via shared memory (mmap'ed file) due to performance reasons. How can I become notification that mmaped memory is changed or... (1 Reply)
Discussion started by: Hitori
1 Replies

9. HP-UX

mmap failed

We recently have been seeing the following type of error on our development server. Being somewhat new to HP-UX I was hoping to get some insight. Here is what I have found. I have been doing some research. /usr/lib/dld.sl: Call to mmap() failed - TEXT /u07/mdev/lib/libCLEND.sl... (2 Replies)
Discussion started by: scotbuff
2 Replies

10. Filesystems, Disks and Memory

mmap

Hello. I'm writing some random access i/o software on Solaris 8 using mmap64 to memory map large files (my test file is ~25 GB). The abbreviated code fragment is: fd = open(cbuf,O_RDONLY|O_LARGEFILE); struct stat statbuf; fstat(fd,&statbuf); off_t len =... (0 Replies)
Discussion started by: gusm
0 Replies

Featured Tech Videos