On Mon, Sep 23, 2024 at 9:21 AM Chris Bennett <cpb_misc@bennettconstruction.us> wrote:
So if I run small program A that has some leaks. I don't free a few
things as suggested. Then I run program B that happens to use those
memory addresses that didn't get freed by program A, what happens then?
Are there problems? Or does it just get used properly?
Mostly, things work properly. But 'how' properly depends on the details.
If program A terminates, then any resources it didn't explicitly free will be
freed automatically and those resources will then be available for re-use.
If program A hangs, or sleeps, or spawns B and waits for it to terminate,
then the resources A holds won't be released. If program A doesn't run
then eventually any memory it holds will be paged out so those pages
can be reused by actively running processes, assuming you have swap
space.
The scenario you give, where B wants to use memory still in use by A,
doesn't really happen because A and B each get their own separate
virtual address spaces. The same address in A will refer to a different
physical page than that same address in B, and the OS will ensure
that the physical pages are not shared inappropriately.
-ken
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