2011-06-06 Pedro Alves <pedro@codesourcery.com>

	gdb/
	* infcall.c (run_inferior_call): Don't mask async.  Instead force
	a synchronous wait, if the target can async.

	* target.h (struct target_ops): Delete to_async_mask.
	(target_async_mask): Delete.
	* target.c (update_current_target): Delete references to to_async_mask.
	* linux-nat.c (linux_nat_async_mask_value): Delete.
	(linux_nat_is_async_p, linux_nat_can_async_p): Remove references
	to linux_nat_async_mask_value.
	(linux_nat_async_mask): Delete.
	(linux_nat_async, linux_nat_close): Remove references to
	linux_nat_async_mask_value.
	* record.c (record_async_mask_value): Delete.
	(record_async): Remove references to record_async_mask_value.
	(record_async_mask): Delete.
	(record_can_async_p, record_is_async_p): Remove references to
	record_async_mask_value.
	(init_record_ops, init_record_core_ops): Remove references to
	record_async_mask.
	* remote.c (remote_async_mask_value): Delete.
	(init_remote_ops): Remove reference to remote_async_mask.
	(remote_can_async_p, remote_is_async_p): Remove references to
	remote_async_mask_value.
	(remote_async): Remove references to remote_async_mask_value.
	(remote_async_mask): Delete.

	* infrun.c (fetch_inferior_event): Don't claim registers changed
	if the current thread is already not executing.

1 files changed, 10 insertions, 1 deletions

diff --git a/gdb/infrun.c b/gdb/infrun.c
index e0df571..a5dbcbd 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -2739,7 +2739,16 @@ fetch_inferior_event (void *client_data)
      status mechanism.  */
 
   overlay_cache_invalid = 1;
-  registers_changed ();
+
+  /* But don't do it if the current thread is already stopped (hence
+     this is either a delayed event that will result in
+     TARGET_WAITKIND_IGNORE, or it's an event for another thread (and
+     we always clear the register and frame caches when the user
+     switches threads anyway).  If we didn't do this, a spurious
+     delayed event in all-stop mode would make the user lose the
+     selected frame.  */
+  if (non_stop || is_executing (inferior_ptid))
+    registers_changed ();
 
   make_cleanup_restore_integer (&execution_direction);
   execution_direction = target_execution_direction ();