08-19-2009
It is not fixed. It depends on the makeup of your C program. All automatic variables are in the stack area. All static and extern variable are in the data area. All allocated memory is in the heap area.
9 More Discussions You Might Find Interesting
1. HP-UX
Hello....
AIX has a limit of 11 shared memory segments per process, does any one know how many HP have?? If so how do I find that out??
Thanks in advance...... (2 Replies)
Discussion started by: catwomen
2 Replies
2. Programming
Hi I am relatively new to programming on UNIX platform. I was wondering if there is any system call so that a process can access systems page table or swap pages from main memory by specifying the page number. I am trying to implement various page replacement algorithms like LRU, OPT, FIFO etc.... (1 Reply)
Discussion started by: jayesch
1 Replies
3. HP-UX
I am fairly new to HP-UX and trying to get a better understanding of the operating system. While poking around a bit I find myself questioning whether I should be concerned about Shared Memory segments with missing CPID and LPID? For example:
ipcs -mp
IPC status from /dev/kmem as of Mon Mar... (2 Replies)
Discussion started by: scotbuff
2 Replies
4. 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
5. Shell Programming and Scripting
Hi,
I have a file that I want to average. So specifically I want to average every third column for each row.
Here is an example of my file
2 2 2 3 3 3 1 1 1 5 5 5
Heres what I want it to look like after averaging every third column
2 3 1 5
thanks (11 Replies)
Discussion started by: kylle345
11 Replies
6. Shell Programming and Scripting
Hello,
I have a awk line that averages rows.
So if my file looks like this:
Jack 1 1 1 1 1 1
Joe 1 1 1 1 1 1
Jerry 0 0 0 0 0 0
John 1 1 1 0 0 0
The awk line below skips column 1 and then averaged the rows
awk -F'\t' -v r=3... (3 Replies)
Discussion started by: phil_heath
3 Replies
7. SuSE
Hi all,
I got an application that is running on SUSE Linux. I would like to get some data about the number of TCP segments retransmission on a particular interface. Is there any way I can get that?
Thanks, (2 Replies)
Discussion started by: Pouchie1
2 Replies
8. Shell Programming and Scripting
Cat file1
--------
----------
SCHEMA.TABLE1
insert-------
update-----
-------------
----------
SCHEMA.TABLE2
insert-------
update-----
-----------
------------
SCHEMA.TABLE3
insert-------
update-----
------------
grep -n SCHEMA > header_file2.txt (2 Replies)
Discussion started by: Veera_V
2 Replies
9. Shell Programming and Scripting
I have queue.txt with the following contents:
Queue on node ...
description :
type : local
max message len : 104857600
max queue depth : 5000
queue depth max event : enabled
persistent msgs : yes
backout... (5 Replies)
Discussion started by: Daniel Gate
5 Replies
LEARN ABOUT NETBSD
stack_align
STACK(9) BSD Kernel Developer's Manual STACK(9)
NAME
STACK -- stack macros
SYNOPSIS
#include <sys/param.h>
type
STACK_ALLOC(sp, size);
type
STACK_MAX(sp, size);
type
STACK_ALIGN(sp, bytes);
type
STACK_GROW(sp, size);
type
STACK_SHRINK(sp, size);
DESCRIPTION
A stack is an area of memory with a fixed origin but with a variable size. A stack pointer points to the most recently referenced location
on the stack. Initially, when the stack has a size of zero, the stack pointer points to the origin of the stack. When data items are added
to the stack, the stack pointer moves away from the origin.
The STACK_ALLOC() macro returns a pointer to allocated stack space of some size. Given the returned pointer sp and size, STACK_MAX() returns
the maximum stack address of the allocated stack space. The STACK_ALIGN() macro can be used to align the stack pointer sp by the specified
amount of bytes.
Two basic operations are common to all stacks: a data item is added (``push'') to the location pointed by sp or a data item is removed
(``pop'') from the stack. The stack pointer must be subsequently adjusted by the size of the data item. The STACK_GROW() and STACK_SHRINK()
macros adjust the stack pointer sp by given size.
A stack may grow either up or down. The described macros take this into account by using the __MACHINE_STACK_GROWS_UP preprocessor define.
SEE ALSO
param(3), queue(3)
BSD
April 8, 2011 BSD