19 Jul
2005
19 Jul
'05
3:05 p.m.
Hi all,
I have a dataspace, reserved as pool 1 by dm_phys, which two tasks shares. They synchronise access to the data by setting a lock at the start of the dataspace with a cmpxchg-loop. All tasks map the dataspace to their own VM area.
The problem is that if one of the tasks exists then the other would stop with a page fault error the next time it accesses the shared dataspace. Both of them where happily reading and writing to the dataspace at exactly the place where the page fault occur.
Any suggestions?
Thanks Leon