From edabfe4ff66090b3b2c433962df4cfe1a68259fd Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@yahoo.com>
Date: Sat, 9 Jul 2022 04:50:06 +0000
Subject: [PATCH] Fix race conditions handling selection clear events on Haiku

* src/haiku_select.cc (be_handle_clipboard_changed_message):
Include current clipboard count.
(be_selection_outdated_p): New function.
* src/haikuselect.c (haiku_handle_selection_clear): Ignore
outdated events.
(haiku_selection_disowned): New argument `count'.  Include it in
the timestamp field of the selection clear event.
* src/haikuselect.h: Update prototypes.
* src/systime.h: Define `Time' to an appropriate value on Haiku.
---
 src/haiku_select.cc | 39 ++++++++++++++++++++++++++++++---------
 src/haikuselect.c   | 10 +++++++++-
 src/haikuselect.h   |  3 ++-
 src/systime.h       |  3 +++
 4 files changed, 44 insertions(+), 11 deletions(-)

diff --git a/src/haiku_select.cc b/src/haiku_select.cc
index edb821e3132..e1f2a815241 100644
--- a/src/haiku_select.cc
+++ b/src/haiku_select.cc
@@ -451,31 +451,37 @@ be_unlock_clipboard (enum haiku_clipboard clipboard, bool discard)
 void
 be_handle_clipboard_changed_message (void)
 {
+  int64 n_clipboard, n_primary, n_secondary;
+
+  n_clipboard = system_clipboard->SystemCount ();
+  n_primary = primary->SystemCount ();
+  n_secondary = secondary->SystemCount ();
+
   if (count_clipboard != -1
-      && (system_clipboard->SystemCount ()
-	  > count_clipboard + 1)
+      && (n_clipboard > count_clipboard + 1)
       && owned_clipboard)
     {
       owned_clipboard = false;
-      haiku_selection_disowned (CLIPBOARD_CLIPBOARD);
+      haiku_selection_disowned (CLIPBOARD_CLIPBOARD,
+				n_clipboard);
     }
 
   if (count_primary != -1
-      && (primary->SystemCount ()
-	  > count_primary + 1)
+      && (n_primary > count_primary + 1)
       && owned_primary)
     {
       owned_primary = false;
-      haiku_selection_disowned (CLIPBOARD_PRIMARY);
+      haiku_selection_disowned (CLIPBOARD_PRIMARY,
+				n_primary);
     }
 
   if (count_secondary != -1
-      && (secondary->SystemCount ()
-	  > count_secondary + 1)
+      && (n_secondary > count_secondary + 1)
       && owned_secondary)
     {
       owned_secondary = false;
-      haiku_selection_disowned (CLIPBOARD_SECONDARY);
+      haiku_selection_disowned (CLIPBOARD_SECONDARY,
+				n_secondary);
     }
 }
 
@@ -487,3 +493,18 @@ be_start_watching_selection (enum haiku_clipboard id)
   clipboard = get_clipboard_object (id);
   clipboard->StartWatching (be_app);
 }
+
+bool
+be_selection_outdated_p (enum haiku_clipboard id, int64 count)
+{
+  if (id == CLIPBOARD_CLIPBOARD && count_clipboard > count)
+    return true;
+
+  if (id == CLIPBOARD_PRIMARY && count_primary > count)
+    return true;
+
+  if (id == CLIPBOARD_SECONDARY && count_secondary > count)
+    return true;
+
+  return false;
+}
diff --git a/src/haikuselect.c b/src/haikuselect.c
index 03aba1f9baa..9d8c4a2cd16 100644
--- a/src/haikuselect.c
+++ b/src/haikuselect.c
@@ -1024,6 +1024,13 @@ init_haiku_select (void)
 void
 haiku_handle_selection_clear (struct input_event *ie)
 {
+  enum haiku_clipboard id;
+
+  id = haiku_get_clipboard_name (ie->arg);
+
+  if (be_selection_outdated_p (id, ie->timestamp))
+    return;
+
   CALLN (Frun_hook_with_args,
 	 Qhaiku_lost_selection_functions, ie->arg);
 
@@ -1033,7 +1040,7 @@ haiku_handle_selection_clear (struct input_event *ie)
 }
 
 void
-haiku_selection_disowned (enum haiku_clipboard id)
+haiku_selection_disowned (enum haiku_clipboard id, int64 count)
 {
   struct input_event ie;
 
@@ -1055,6 +1062,7 @@ haiku_selection_disowned (enum haiku_clipboard id)
       break;
     }
 
+  ie.timestamp = count;
   kbd_buffer_store_event (&ie);
 }
 
diff --git a/src/haikuselect.h b/src/haikuselect.h
index d027834e8b6..61efeb9cd93 100644
--- a/src/haikuselect.h
+++ b/src/haikuselect.h
@@ -39,7 +39,7 @@ extern "C"
 {
 #endif
 /* Defined in haikuselect.c.  */
-extern void haiku_selection_disowned (enum haiku_clipboard);
+extern void haiku_selection_disowned (enum haiku_clipboard, int64);
 
 /* Defined in haiku_select.cc.  */
 extern void be_clipboard_init (void);
@@ -66,6 +66,7 @@ extern int be_lock_clipboard_message (enum haiku_clipboard, void **, bool);
 extern void be_unlock_clipboard (enum haiku_clipboard, bool);
 extern void be_handle_clipboard_changed_message (void);
 extern void be_start_watching_selection (enum haiku_clipboard);
+extern bool be_selection_outdated_p (enum haiku_clipboard, int64);
 
 #ifdef __cplusplus
 };
diff --git a/src/systime.h b/src/systime.h
index 75088bd4a62..085a7ddeaba 100644
--- a/src/systime.h
+++ b/src/systime.h
@@ -26,6 +26,9 @@ INLINE_HEADER_BEGIN
 
 #ifdef HAVE_X_WINDOWS
 # include <X11/X.h>
+#elif defined HAVE_HAIKU
+# include <support/SupportDefs.h>
+typedef int64 Time;
 #else
 typedef unsigned long Time;
 #endif
-- 
2.39.5