I still don't really follow what point you're trying to make, but you don't seem to get getting how forking and virtual memory works.

Consider a process which uses two int/pointer sized memory locations. One contains a value, and the second contains a pointer to the first: 

virtual      value
address

0x10000 0x12345678
0x10008    0x10000

[download]
Those are virtual addresses - those are the addresses the process sees, and which are printed out in things like SCALAR(0x10000). The CPU's hardware behind the scenes maps that page of address space for that process to some physical page in RAM. This is all behind the scenes - you never get to see physical addresses. After the fork, the child process gets a *copy* of the parents address space - same virtual address locations, but mapping to a different physical page of memory which contains a copy of the values: 
physical virtual      value
address  address

parent

0x2220000 0x10000 0x12345678
0x2220008 0x10008    0x10000

child

0x4440000 0x10000 0x12345678
0x4440008 0x10008    0x10000

[download]
After the child modifies the value, you get this: 
parent

0x2220000 0x10000 0x12345678
0x2220008 0x10008    0x10000

child

0x4440000 0x10000 0xdeadbeef
0x4440008 0x10008    0x10000

[download]
There is absolutely no connection between the parent and child aside from the fact that initially the child's value in its memory is a copy of the parent's. If you think your code shows shows something else, please say which exact line of output shows this, and what you think its output should be.

Dave.

In reply to Re^3: Perl forked processes and variable sharing by dave_the_m
in thread Perl forked processes and variable sharing by fireblood

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