2008-08-18 Pedro Alves <pedro@codesourcery.com>

	gdb/doc/
	* observer.texi (thread_ptid_changed): New.

	gdb/
	* gdbthread.h (thread_change_ptid): Declare.
	* infrun.c (infrun_thread_ptid_changed): New.
	(_initialize_infrun): Attach infrun_thread_ptid_changed to the
	thread_ptid_changed observer.
	* regcache.c (regcache_thread_ptid_changed): New.
	(_initialize_regcache): Attach regcache_thread_ptid_changed to the
	thread_ptid_changed observer.
	* thread.c (thread_change_ptid): New.

1 files changed, 26 insertions, 0 deletions

diff --git a/gdb/infrun.c b/gdb/infrun.c
index de7de790710..19b3229abc0 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -865,6 +865,30 @@ displaced_step_fixup (ptid_t event_ptid, enum target_signal signal)
     }
 }
 
+/* Update global variables holding ptids to hold NEW_PTID if they were
+   holding OLD_PTID.  */
+static void
+infrun_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid)
+{
+  struct displaced_step_request *it;
+
+  if (ptid_equal (inferior_ptid, old_ptid))
+    inferior_ptid = new_ptid;
+
+  if (ptid_equal (singlestep_ptid, old_ptid))
+    singlestep_ptid = new_ptid;
+
+  if (ptid_equal (displaced_step_ptid, old_ptid))
+    displaced_step_ptid = new_ptid;
+
+  if (ptid_equal (deferred_step_ptid, old_ptid))
+    deferred_step_ptid = new_ptid;
+
+  for (it = displaced_step_request_queue; it; it = it->next)
+    if (ptid_equal (it->ptid, old_ptid))
+      it->ptid = new_ptid;
+}
+
 
 /* Resuming.  */
 
@@ -4855,4 +4879,6 @@ breakpoints, even if such is supported by the target."),
   inferior_ptid = null_ptid;
   target_last_wait_ptid = minus_one_ptid;
   displaced_step_ptid = null_ptid;
+
+  observer_attach_thread_ptid_changed (infrun_thread_ptid_changed);
 }