Reland "[lldb] [llgs] Fix multi-resume bugs with nonstop mode"

Improve handling of multiple successive continue packets in non-stop
mode.  More specifically:

1. Explicitly send error response (instead of crashing on assertion)
   if the user attempts to resume the same process twice.  Since we
   do not support thread-level non-stop mode, one needs to always stop
   the process explicitly before resuming another thread set.

2. Actually stop the process if "vCont;t" is delivered to a running
   process.  Similarly, we only support stopping all the running threads
   simultaneously (via -1) and return an error in any other case.

With this patch, running multiple processes simultaneously is still
unsupported.  The patch also employs a hack to avoid enabling stdio
forwarding on "vCont;t" packet.  Both of these issues are addressed
by followup patches.

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.llvm.org/D128710

1 files changed, 3 insertions, 0 deletions

diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
index ebd6566..47e8a78 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.h
@@ -155,6 +155,9 @@ protected:
 
   PacketResult Handle_QListThreadsInStopReply(StringExtractorGDBRemote &packet);
 
+  PacketResult ResumeProcess(NativeProcessProtocol &process,
+                             const ResumeActionList &actions);
+
   PacketResult Handle_C(StringExtractorGDBRemote &packet);
 
   PacketResult Handle_c(StringExtractorGDBRemote &packet);