Hi,
Can anyone tell me the difference between heap memory and stack stack
both physically and fundamentally. It would be a real favour.
Regards,
Veeru
12  6225 
Veeru wrote:
Can anyone tell me the difference between heap memory and stack stack
both physically and fundamentally. It would be a real favour.
www.google.com, please.
Hi,
A very simple view of a part of a compiled C++ program (assuming x86 machine
32 bit visual C++ (but I guess borland would do the same)
func( long A )
{
long B;
long *C = new long;
}
What happens when func gets called:
Caller of func pushes A on the stack
Caller of func actually calls func by ML 'call' operation this pushes the
return address on the stack
Func is entered typically it builds a stack frame (i.e. it pushes ebp onto
the stack stores the current stack pointer into the ebp register and makes
room on the stack for the local (automatic variables) That is it will
substreact 8 from the esp register (4 for B and 4 for C pointer not for the
pointed too)
Next the 'new long' is executed this will search for a few bytes of free
memory in a separate part of memory (i.e. not the heap) the address for this
memory is stored in C i.e. on the stack.\
When func exits it will cleanup the build stack frame i.e load esp with ebp
and pop ebp of the stack
After leaving func the caller will add 4 to esp to get rid of the room for A
(note the x86 is actually more optimised for pascal calling convention used
for instance in ms-windows, here the called function also adjust the esp to
get rid of the room for A. In ml x86 this can be done with one instruction
'ret 4' )
--
Regards, Ron AF Greve http://moonlit.xs4all.nl
"Veeru" <va******@gmail .comwrote in message
news:11******** *************@e 3g2000cwe.googl egroups.com...
Hi,
Can anyone tell me the difference between heap memory and stack stack
both physically and fundamentally. It would be a real favour.
Regards,
Veeru
--
Regards, Ron AF Greve http://moonlit.xs4all.nl
"Moonlit" <news moonlit xs4all nlwrote in message
news:45******** **************@ news.xs4all.nl. ..
Hi,
A very simple view of a part of a compiled C++ program (assuming x86
machine 32 bit visual C++ (but I guess borland would do the same)
func( long A )
{
long B;
long *C = new long;
}
What happens when func gets called:
Caller of func pushes A on the stack
Caller of func actually calls func by ML 'call' operation this pushes the
return address on the stack
Func is entered typically it builds a stack frame (i.e. it pushes ebp onto
the stack stores the current stack pointer into the ebp register and makes
room on the stack for the local (automatic variables) That is it will
substreact 8 from the esp register (4 for B and 4 for C pointer not for
the pointed too)
Next the 'new long' is executed this will search for a few bytes of free
memory in a separate part of memory
--->(i.e. not the heap)
sorry meant 'i,e, not the stack' :-(
the address for this
memory is stored in C i.e. on the stack.\
When func exits it will cleanup the build stack frame i.e load esp with
ebp and pop ebp of the stack
After leaving func the caller will add 4 to esp to get rid of the room for
A
(note the x86 is actually more optimised for pascal calling convention
used for instance in ms-windows, here the called function also adjust the
esp to get rid of the room for A. In ml x86 this can be done with one
instruction 'ret 4' )
--
Regards, Ron AF Greve
http://moonlit.xs4all.nl
"Veeru" <va******@gmail .comwrote in message
news:11******** *************@e 3g2000cwe.googl egroups.com...
>Hi,
Can anyone tell me the difference between heap memory and stack stack
both physically and fundamentally. It would be a real favour.
Regards,
Veeru
Moonlit wrote:
Hi,
Please don't top-post. Your replies belong following or interspersed
with properly trimmed quotes. See the majority of other posts in the
newsgroup, or the group FAQ list:
<http://www.parashift.c om/c++-faq-lite/how-to-post.html>
Brian
Veeru wrote:
Hi,
Can anyone tell me the difference between heap memory and stack stack
both physically and fundamentally. It would be a real favour.
Look in the nice textbook on operating systems, or computer
architecture or what have you on your computer science bookshelf.
Here is another idea, also: http://www.justfuckinggoogleit.com/s...p+stack+memory
Hi,
I didn't see anything about top posting there actually.
I like to toppost so you don't have to scroll all the way down (personally I
really hate that).
Why do you think replies 'belong following or interspersed'?
Let everyone post the way they like, think about freedom instead of imposing
your will on others.
Regards, Ron AF Greve http://moonlit.xs4all.nl
PS: You can probably add me to your kill list or just don't read my posts
(and really you don't have to tell me that you did).
"Default User" <de***********@ yahoo.comwrote in message
news:4m******** ****@individual .net...
Moonlit wrote:
>Hi,
Please don't top-post. Your replies belong following or interspersed
with properly trimmed quotes. See the majority of other posts in the
newsgroup, or the group FAQ list:
<http://www.parashift.c om/c++-faq-lite/how-to-post.html>
Brian
Moonlit wrote:
Hi,
I didn't see anything about top posting there actually.
Read item 5.4 again.
>
I like to toppost so you don't have to scroll all the way down (personally I
really hate that).
Why do you think replies 'belong following or interspersed'?
By more or less general consensus, this is considered good etiquette by
this newsgroup. Obviously USENET is a (mostly) free entity and you can
do what you want, but it would be polite to respect established conventions.
From a more practical point of view, because USENET threads tend to
resemble conversations between multiple parties, where one often
responds (and responds and responds) to earlier posts, interspersed
replies maintain the chronological order of the discussion. And if one
wants to respond to a _particular section_ of a prior post, such as I
have done above in response to your claim not to have seen anything
about top posting in the FAQ, then there's really no sensible place to
do so except immediately after the section of interest.
Mark
"Moonlit" <news moonlit xs4all nlwrote:
[snip]
I didn't see anything about top posting there actually.
It's at the end of 5.4.
I like to toppost so you don't have to scroll all the way down (personally
I really hate that).
Why do you think replies 'belong following or interspersed'?
Because, that makes it clear what you are replying to. See also the PS.
Let everyone post the way they like, think about freedom instead of
imposing your will on others.
[snip]
It's a cultural (and very much local) thing. In this news group, the culture
is that top posting is frowned upon. Of course, the regulars cannot stop
you, but they can (and will) correct you more or less every time. At some
point, they might decide to kill-file you. As a matter of fact, some
regulars feel rather strongly about this issue.
Best
Kai-Uwe Bux
PS: A top post version of my reply your have been. You may want to check if
it is really easy to see what it is that I reply to:
It's at the end of 5.4.
Because, that makes it clear what you are replying to. See also the PS.
It's a cultural (and very much local) thing. In this news group, the culture
is that top posting is frowned upon. Of course, the regulars cannot stop
you, but they can (and will) correct you more or less every time. At some
point, they might decide to kill-file you. As a matter of fact, some
regulars feel rather strongly about this issue.
>I didn't see anything about top posting there actually.
I like to toppost so you don't have to scroll all the way down (personally
I really hate that).
Why do you think replies 'belong following or interspersed'?
Let everyone post the way they like, think about freedom instead of
imposing your will on others.
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