l4-linux booted !

Michael Hohmuth hohmuth at innocent.com
Fri Dec 4 02:45:12 CET 1998


roux at ecoledoc.lip6.fr (Cedric ROUX) writes:

> Then, another time, the boot process blocks with this time the message :
> ipc.cc:169 : failed assertion `! in_sender_list()'

Attached below are some Fiasco patches which should help.

This problem was a symptom of a familiar problem: Code which disables
interrupts to protect a critical region trapped into a page fault
which subsequently enabled interrupts again.  We now protect against
this problem by pre-installing all pages required for the operation in
a safe way before the actual critical region starts.

Ugly synchronization problems like this have been one of the main
reasons to try to get rid of disabling interrupts altogether.
However, the occasional "cli" instruction is still lurking in the
code, waiting to be replaced with better mechanisms (like non-blocking
synchronization).

The patch also includes a fix which enhances compatibility with
Jochen's L4 so that L4Linux can handle segmentation faults better.

Michael
-- 
hohmuth at innocent.com, hohmuth at inf.tu-dresden.de
http://home.pages.de/~hohmuth/

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