master c258528cfb: Fix race conditions when calculating Haiku frame geometry

[Po Lu]

branch: master
commit c258528cfbc27f1f7e7604425a4c3d3dc78408bb
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix race conditions when calculating Haiku frame geometry
    
    * src/haiku_support.cc (be_lock_window, be_unlock_window): New
    functions.
    * src/haiku_support.h: Update prototypes.
    
    * src/haikufns.c (frame_geometry): Lock window before asking for
    its dimensions and frame.
---
 src/haiku_support.cc | 17 +++++++++++++++++
 src/haiku_support.h  |  2 ++
 src/haikufns.c       | 13 +++++++++----
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/src/haiku_support.cc b/src/haiku_support.cc
index 28c8608584..0c126dab3d 100644
--- a/src/haiku_support.cc
+++ b/src/haiku_support.cc
@@ -5163,3 +5163,20 @@ be_send_move_frame_event (void *window)
 
   msg.SendMessage (SEND_MOVE_FRAME_EVENT);
 }
+
+void
+be_lock_window (void *window)
+{
+  BWindow *wnd = (BWindow *) window;
+
+  if (!wnd->LockLooper ())
+    gui_abort ("Failed to lock window looper");
+}
+
+void
+be_unlock_window (void *window)
+{
+  BWindow *wnd = (BWindow *) window;
+
+  wnd->UnlockLooper ();
+}
diff --git a/src/haiku_support.h b/src/haiku_support.h
index 22f13c1ee6..14dd36e275 100644
--- a/src/haiku_support.h
+++ b/src/haiku_support.h
@@ -691,6 +691,8 @@ extern void be_get_window_decorator_dimensions (void *, int 
*, int *, int *, int
 extern void be_get_window_decorator_frame (void *, int *, int *, int *, int *);
 extern void be_send_move_frame_event (void *);
 
+extern void be_lock_window (void *);
+extern void be_unlock_window (void *);
 #ifdef __cplusplus
 }
 
diff --git a/src/haikufns.c b/src/haikufns.c
index fa47da73d2..8b6296e6ae 100644
--- a/src/haikufns.c
+++ b/src/haikufns.c
@@ -1394,17 +1394,22 @@ static Lisp_Object
 frame_geometry (Lisp_Object frame, Lisp_Object attribute)
 {
   struct frame *f, *parent;
+  void *window;
   int outer_x, outer_y, outer_width, outer_height;
   int right_off, bottom_off, top_off;
   int native_x, native_y;
 
   f = decode_window_system_frame (frame);
   parent = FRAME_PARENT_FRAME (f);
+  window = FRAME_HAIKU_WINDOW (f);
+
+  be_lock_window (window);
+  be_get_window_decorator_frame (window, &outer_x, &outer_y,
+                                &outer_width, &outer_height);
+  be_get_window_decorator_dimensions (window, NULL, &top_off,
+                                     &right_off, &bottom_off);
+  be_unlock_window (window);
 
-  be_get_window_decorator_frame (FRAME_HAIKU_WINDOW (f), &outer_x,
-                                &outer_y, &outer_width, &outer_height);
-  be_get_window_decorator_dimensions (FRAME_HAIKU_WINDOW (f), NULL,
-                                     &top_off, &right_off, &bottom_off);
   native_x = FRAME_OUTPUT_DATA (f)->frame_x;
   native_y = FRAME_OUTPUT_DATA (f)->frame_y;