Fringe cleanup.

[bpt/emacs.git] / src / blockinput.h

diff --git a/src/blockinput.h b/src/blockinput.h
index c4c4979..6d4fde2 100644 (file)
--- a/src/blockinput.h
+++ b/src/blockinput.h
@@ -1,4 +1,4 @@
-/* Interface to blocking complicated interrupt-driven input.
+/* blockinput.h - interface to blocking complicated interrupt-driven input.
    Copyright (C) 1989, 1993 Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
@@ -15,8 +15,13 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with GNU Emacs; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
 
+#ifndef EMACS_BLOCKINPUT_H
+#define EMACS_BLOCKINPUT_H
+
+#include "atimer.h"
 
 /* When Emacs is using signal-driven input, the processing of those
    input signals can get pretty hairy.  For example, when Emacs is
@@ -43,30 +48,57 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
    interrupt_input_pending to a non-zero value.  If that flag is set
    when input becomes unblocked, UNBLOCK_INPUT will send a new SIGIO.  */
 
-extern unsigned int interrupt_input_blocked;
+extern int interrupt_input_blocked;
 
 /* Nonzero means an input interrupt has arrived
    during the current critical section.  */
 extern int interrupt_input_pending;
 
+
+/* Non-zero means asynchronous timers should be run when input is
+   unblocked.  */
+
+extern int pending_atimers;
+
 /* Begin critical section. */
 #define BLOCK_INPUT (interrupt_input_blocked++)
 
-/* End critical section. */
-#ifdef SIGIO
-/* If doing interrupt input, and an interrupt came in when input was blocked,
-   reinvoke the interrupt handler now to deal with it.  */
-#define UNBLOCK_INPUT \
-  (interrupt_input_blocked--, \
-   (interrupt_input_blocked < 0 ? (abort (), 0) : 0), \
-   ((interrupt_input_blocked == 0 && interupt_input_pending != 0) \
-    ? (kill (0, SIGIO), 0) \
-    : 0))
-#else
-#define UNBLOCK_INPUT \
-  (interrupt_input_blocked--, \
-   (interrupt_input_blocked < 0 ? (abort (), 0) : 0))
-#endif
+/* End critical section.
+
+   If doing signal-driven input, and a signal came in when input was
+   blocked, reinvoke the signal handler now to deal with it.
+
+   We used to have two possible definitions of this macro - one for
+   when SIGIO was #defined, and one for when it wasn't; when SIGIO
+   wasn't #defined, we wouldn't bother to check if we should re-invoke
+   the signal handler.  But that doesn't work very well; some of the
+   files which use this macro don't #include the right files to get
+   SIGIO.
+
+   So, we always test interrupt_input_pending now; that's not too
+   expensive, and it'll never get set if we don't need to resignal.  */
+
+#define UNBLOCK_INPUT                          \
+  do                                           \
+    {                                          \
+      --interrupt_input_blocked;               \
+      if (interrupt_input_blocked == 0)                \
+       {                                       \
+         if (interrupt_input_pending)          \
+           reinvoke_input_signal ();           \
+         if (pending_atimers)                  \
+           do_pending_atimers ();              \
+       }                                       \
+      else if (interrupt_input_blocked < 0)    \
+       abort ();                               \
+    }                                          \
+  while (0)
 
 #define TOTALLY_UNBLOCK_INPUT (interrupt_input_blocked = 0)
 #define UNBLOCK_INPUT_RESIGNAL UNBLOCK_INPUT
+
+/* Defined in keyboard.c */
+/* Don't use a prototype here; it causes trouble in some files.  */
+extern void reinvoke_input_signal ();
+
+#endif /* EMACS_BLOCKINPUT_H */