[PATCH v4 20/44] gdbserver: allow inferiors without threads

An Intel GPU device is modeled as an inferior and GPU software threads are
modeled as threads.  Software threads represent the work that has been
dispatched to a GPU device.  When a thread completes its work, it exits.
When new work is dispatched to a GPU device, new software threads are
created.

In such a model, when no work is currently dispatched to a GPU device, we
are left with the GPU inferior representing the GPU device but no threads.
---
 gdbserver/server.cc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gdbserver/server.cc b/gdbserver/server.cc
index 03a40c7a19e..7ad93e5e303 100644
--- a/gdbserver/server.cc
+++ b/gdbserver/server.cc
@@ -278,7 +278,7 @@ struct notif_server notif_stop =
 static int
 target_running (void)
 {
-  return get_first_thread () != NULL;
+  return (get_first_process () != nullptr);
 }
 
 /* See gdbsupport/common-inferior.h.  */
@@ -339,8 +339,12 @@ attach_inferior (int pid)
 	  && cs.last_status.sig () == GDB_SIGNAL_STOP)
 	cs.last_status.set_stopped (GDB_SIGNAL_TRAP);
 
-      current_thread->last_resume_kind = resume_stop;
-      current_thread->last_status = cs.last_status;
+      /* We may not have any threads, yet, after attaching.  */
+      if (current_thread != nullptr)
+	{
+	  current_thread->last_resume_kind = resume_stop;
+	  current_thread->last_status = cs.last_status;
+	}
     }
 
   return 0;
-- 
2.43.0

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