Subject: Re: proposal for PR 27023
To: None <firstname.lastname@example.org, email@example.com,>
From: Chuck Silvers <firstname.lastname@example.org>
Date: 01/25/2005 10:08:59
... of course, while in the shower just after sending the previous message,
I realized that I was confusing things. there are actually two cases
for SA context switching:
(1) handled by libpthread. in this case, the register window contents
must be flushed to the user stack, since as I talked about before,
the thread may be run on a different LWP next.
(2) handled by the kernel. in this case, the user thread is obviously
tied to the current LWP (since the thread/LWP is going to sleep in
the kernel), so in this case saving the register windows to the PCB
is good enough.
so it's much simpler than I thought, cpu_getmcontext() just has to
distinguish these cases and skip the rwindow_save() in the latter case.