From 835ee136c54348a61f5b5d2ef34de05e5c3476ed Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Sun, 6 Mar 2005 15:59:44 +0000
Subject: [PATCH] (UNBLOCK_INPUT_TO): New macro. (TOTALLY_UNBLOCK_INPUT):
 Handle a pending signal if any.

---
 src/blockinput.h | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/blockinput.h b/src/blockinput.h
index a4c8a9b9c22..a3b50d2a0f2 100644
--- a/src/blockinput.h
+++ b/src/blockinput.h
@@ -94,7 +94,30 @@ extern int pending_atimers;
     }						\
   while (0)
 
-#define TOTALLY_UNBLOCK_INPUT (interrupt_input_blocked = 0)
+/* Undo any number of BLOCK_INPUT calls,
+   and also reinvoke any pending signal.  */
+
+#define TOTALLY_UNBLOCK_INPUT			\
+  if (interrupt_input_blocked != 0)		\
+    {						\
+      interrupt_input_blocked = 1;		\
+      UNBLOCK_INPUT;				\
+    }						\
+  else
+
+/* Undo any number of BLOCK_INPUT calls down to level LEVEL,
+   and also (if the level is now 0) reinvoke any pending signal.  */
+
+#define UNBLOCK_INPUT_TO(LEVEL)				\
+  do							\
+    {							\
+      int oldlevel = interrupt_input_blocked;		\
+      interrupt_input_blocked = (LEVEL) + 1;		\
+      if (interrupt_input_blocked != oldlevel + 1)	\
+        UNBLOCK_INPUT;					\
+    }							\
+  while (0)
+
 #define UNBLOCK_INPUT_RESIGNAL UNBLOCK_INPUT
 
 /* In critical section ? */
-- 
2.39.2