Hello Zachary,
On 15.02.24 15:49, Zachary Zollers wrote:
Hello Genodians,
I am attempting to familiarize myself with some of the provided data
structures. When playing around with the Registry class, I encountered an
interesting error. [1] is a GitHub gist containing the code I am running. I am
wanting to use the Registry class to keep track of services announced by
children on a parent component. When looking though the Genode repository, this
seemed to be the accepted way to do this (please correct me if I am
misunderstanding). When I run this code, I get the following output:
Genode 23.11
87 MiB RAM and 63252 caps assigned to init
[init -> parent] Child requested session: 'PD'
Error: illegal READ at address 0x4 by pager_object: pd='init -> parent'
thread='ep' ip=0x7acf4
I would like to pass a reference to the Registry to each instance of
Child_policy so I can use services announced by other children. As an
additional experiment however, I tried creating a new Registry as a class
member for each Child_policy (see the comment at the top of the Tutorial::Child
class). This resulted in the following output:
Genode 23.11
87 MiB RAM and 63252 caps assigned to init
[init -> parent] Child requested session: 'PD'
To me, this indicates that the for_each call is blocking. I cannot see,
however, what would be holding the mutex before I get to this point. Any
pointers in the right direction would be greatly appreciated :)
[1] https://gist.github.com/zgzollers/48181fbc2dac6e51015602c6329593f9
without looking much into your code, does it help to add
! <service name="PD"/>
to the <parent-provides> node?
Regards,
Sebastian
--
Sebastian Sumpf
Genode Labs
http://www.genode-labs.com · http://genode.org
Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden
Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
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