[PATCH 4/4] gdb: change regcache list to be a map

[Tom Tromey]

Tom> A simple fix would be to fall back to iterating over the map in the
Tom> is_pid case.  I don't know whether this would reintroduce the
Tom> performance issue that prompted the patch, though.

FWIW this worked for my test case.

I also have some ravenscar-thread changes, though I'm not sure yet if
those are really needed.

Tom

diff --git a/gdb/regcache.c b/gdb/regcache.c
index cd54bc6b5f9..d409b8c2f25 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -486,7 +486,15 @@ registers_changed_ptid (process_stratum_target *target, ptid_t ptid)
       if (ptid_regc_map_it != regcaches.end ())
 	{
 	  auto &ptid_regc_map = ptid_regc_map_it->second;
-	  ptid_regc_map.erase (ptid);
+
+	  auto last = ptid_regc_map.end ();
+	  for (auto i = ptid_regc_map.begin (); i != last; )
+	    {
+	      if (i->first.matches (ptid))
+		i = ptid_regc_map.erase (i);
+	      else
+		++i;
+	    }
 	}
     }
   else