Hi everybody,
We have implemented remote support for non-stop mode in a local Hexagon
repo of LLDB and begun to upstream the work, see
http://reviews.llvm.org/D9656. Non-Stop mode in a remote stub lets you
examine a single stopped thread while others execute normally. This
isn't currently a feature of llgs, but is of gdbserver and can be tested
on x86.
The remote protocol currently needs to be extended to support
asynchronous notifications so it can interact with a non-stop stub. To
solve this we've switched to multi-threaded mode from the abstract
communications class by implementing AppendBytesToCache() in
GDBRemoteCommunication. Allowing us to spawn a read thread that
continually reads packets into a packet queue. Packets are then accessed
by popping a packet from the queue in a thread safe manner.
Since this is a significant change to the remote protocol implementation
which won't just affect non-stop mode I'd like some feedback to check if
people have any comments about it.
The patches are ready to go, and will be put up for review soon.
Thanks,
Ewan
--
Ewan Crawford
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