Re: Commpage, Copy on Write
Re: Commpage, Copy on Write
- Subject: Re: Commpage, Copy on Write
- From: Mike Smith <email@hidden>
- Date: Sun, 19 Mar 2006 14:48:21 -0800
On Mar 18, 2006, at 8:31 PM, Shashi Rao wrote:
* Mike Smith <email@hidden> [2006-03-18 13:23:32-0800]:
|
| On Mar 18, 2006, at 12:41 PM, Shashi Rao wrote:
|
| >Why can't I write to the commpage on my G5 running Tiger? Does it
| >not have COW semantics?
|
| Obviously, no.
|
| Communication via the commpage is one-way (kernel -> global
userspace).
How do I breakpoint a child process in the commpage then?
You don't.
Is there a reason the kernel engineers decided to not allow COW on
these pages?
As I noted above, the commpage is used for communication from the
kernel to all user tasks.
If you were to COW them, it wouldn't be "common" anymore.
= Mike
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