02-26-2015
Memory allocation for particular process in UNIX
Thanks for your Reply Kbw but I did not understand that how would I allocate memory using this.
I want to allocate some part of RAM to this process using C program
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I would like to know how I could allocate some more memory to a process.
Please note that I am not the root user. (1 Reply)
Discussion started by: sagar
1 Replies
2. UNIX for Advanced & Expert Users
Hello!
First of all, forgive me for bad English.
When I starts new thread (pthread_create), system allocates some memory for it (for example, for thread's stack). I wonder when does it deallocate this memory? The problem is that I have a program which sometimes creates new threads and sometimes... (3 Replies)
Discussion started by: prankster
3 Replies
3. UNIX for Dummies Questions & Answers
Hi all,
I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap... (1 Reply)
Discussion started by: dehuang83
1 Replies
4. HP-UX
Hi all,
I have a HP-UX Server with 4 gigabytes of physical RAM. When I use the 'Glance' utility to see what my memory utilization is, my memory usage shows up maxed out at 99%. I shut off all the known processes that I'm running on that box and the memory utilization is still at 78% (with Swap... (3 Replies)
Discussion started by: dehuang83
3 Replies
5. Programming
Hi everyone,
I'm not new to C programming, but I'm having question regarding the memory allocation of a pointer variable which, for instance, will be declared in main(), but its memory will be allocated in subroutine.
To clearify my question, I provide a small working example:
#include... (1 Reply)
Discussion started by: MIB_Maik
1 Replies
6. Programming
Hi Experts
I need some help in static memory allocation in C. I have a program in which I declared 2 variables, one char array and one integer. I was little surprised to see the addresses of the variables.
First:
int x;
char a;
printf("%u %u\n', &x, a);
I got the addresses displayed... (2 Replies)
Discussion started by: unx_freak
2 Replies
7. Shell Programming and Scripting
hello all..
i'm a beginner in shell scripting. I need to know what is really happening when we are creating a variable in shell scripting? how memory is allocated for that variable? (3 Replies)
Discussion started by: aarathy
3 Replies
8. HP-UX
Hi,
I have HP-UX 11i v3 running on ia64. One of my application is 32-bit and I want to increase the memory allocation of this file upto 2GB. I am contentiously receiving an error message of Out of Memory.
Can you please explain the procedure what kernel configuration( like maxdsize or... (1 Reply)
Discussion started by: ahmadamin416
1 Replies
9. Programming
Hello,
I am new to C++ programming, so I'm still getting a feel for things. I recently wrote a simple C++ program (to be used as a ROOT Macro) to conduct a statistical analysis of a varied version of the Monty Hall problem (code below). Basically, the programs runs a few simple calculations to... (7 Replies)
Discussion started by: Tyler_92
7 Replies
10. UNIX for Dummies Questions & Answers
I am using ubuntu. I have written a program to calculate prime factors. it works perfectly fine till entered number is less than 9989 (or so ) but when one enters a number higher than that, for example 15000, it does not work. Can anyone guide me whats the problem ? although new codes are welcome,... (2 Replies)
Discussion started by: Abhishek_kumar
2 Replies
LEARN ABOUT HPUX
xtrealloc
XtRealloc() XtRealloc()
Name
XtRealloc - change the size of an allocated block of storage.
Synopsis
char *XtRealloc(ptr, num);
char *ptr;
Cardinal num;
Inputs
ptr Specifies a pointer to memory allocated with XtMalloc(), XtCalloc(), or XtRealloc(), or NULL.
num Specifies the new number of bytes of memory desired in the block.
Returns
A pointer to allocated memory.
Description
XtRealloc() changes the size of the block of allocated memory pointed to by ptr to be at least num bytes large. In order to make this size
change, it may have to allocate a new block of memory and copy the contents of the old block (or as much as will fit) into the new block.
If it allocates a new block of memory, it frees the old block. In either case, it returns a pointer to a block of memory which is of the
requested size. If there is insufficient memory to allocate the new block, XtRealloc() terminates by calling XtErrorMsg().
If ptr is NULL, XtRealloc() simply calls XtMalloc() to allocate a block of memory of the requested size.
Usage
Note that XtRealloc() may move the contents of your allocated memory to a new location; the return value may or may not be the same as ptr.
Not all memory can be safely reallocated. If there are multiple pointers to a block of memory scattered through out an application (such
as pointers to a widget record), then reallocating that memory is not safe, because all pointers to it cannot be updated. Other memory
(such as the array of children maintained privately by the Composite widget class) can be safely updated because there should be only one
pointer to it in the application (in this case the pointer is the composite.children field of the widget). These cautions are no different
than those required with the standard realloc() function.
In most cases, you will have to cast the return value of XtRealloc() to an appropriate pointer type.
Note that because XtRealloc() behaves like XtMalloc() when passed a NULL pointer, (something that realloc() does not do), you don't have to
write special case code to allocate the first chunk of memory with XtMalloc() and subsequent chunks with XtRealloc(); you can simply use
XtRealloc() everywhere.
Memory allocated with XtRealloc() must be deallocated with XtFree(). The function XtRealloc() is implemented by the Toolkit independently
of the particular environment, so programs ported to a system not supporting malloc will still work.
See Also
XtCalloc(1), XtFree(1), XtMalloc(1), XtNew(1), XtNewString(1).
Xt - Memory Allocation XtRealloc()