[Drbd-dev] DRBD-8 - after_state_ch() can attempt to terminate worker thread with wait==true

[Philipp Reisner]

Am Montag, 7. August 2006 15:33 schrieb Graham, Simon:
> Near the end of after_state_ch() there are several clauses that stop
> (and restart) receiver and worker threads synchronously - since this
> function is called from both the worker and receiver thread context,
> these calls cannot be made synchronously (and an ASSERT in
> _drbd_thread_stop will fire).
>
> There seem to be a couple of issues here:
>
> 1. Is it the intention that after_state_ch is always called from the
> worker thread? If so, then the calls in drbd_receiver and
>    drbd_fs need to change to submit work items
>
> 2. No matter what, it should not issue synchronous calls to
> drbd_thread_stop for non-current threads.
>

I have to admit that I do not know myself how to do this right by now.

I wanted to get all those drbd_thread_stop*() calls spread all over the
code (usually happening if a state change was successfull) into a
central place.

The right solution probably is to use the asynchronous versions
in the after_state_ch() function, and to create aditional functions
with the semantics of wait_thread() , that can be used in that
some places after the successfull state change....

Will do this somewhen next week.

-Phil
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