gdb: add some extra debug information to attach_command

While working on another patch I wanted to add some extra debug
information to the attach_command function.  This required me to add a
new function to convert the thread_info::state variable to a string.

The new debug might be useful to others, and the state to string
function might be useful in other locations, so I thought I'd merge
it.

1 files changed, 20 insertions, 0 deletions

diff --git a/gdb/thread.c b/gdb/thread.c
index 8a7d142..c43f661 100644
--- a/gdb/thread.c
+++ b/gdb/thread.c
@@ -2050,6 +2050,26 @@ thread_name (thread_info *thread)
   return target_thread_name (thread);
 }
 
+/* See gdbthread.h.  */
+
+const char *
+thread_state_string (enum thread_state state)
+{
+  switch (state)
+    {
+    case THREAD_STOPPED:
+      return "STOPPED";
+
+    case THREAD_RUNNING:
+      return "RUNNING";
+
+    case THREAD_EXITED:
+      return "EXITED";
+    }
+
+  gdb_assert_not_reached ("unknown thread state");
+}
+
 /* Return a new value for the selected thread's id.  Return a value of
    0 if no thread is selected.  If GLOBAL is true, return the thread's
    global number.  Otherwise return the per-inferior number.  */