/* blockinput.h - interface to blocking complicated interrupt-driven input.
- Copyright (C) 1989, 1993 Free Software Foundation, Inc.
+ Copyright (C) 1989, 1993, 2001-2011 Free Software Foundation, Inc.
This file is part of GNU Emacs.
-GNU Emacs is free software; you can redistribute it and/or modify
+GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#ifndef EMACS_BLOCKINPUT_H
#define EMACS_BLOCKINPUT_H
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 int interrupt_input_blocked;
+extern volatile int interrupt_input_blocked;
/* Nonzero means an input interrupt has arrived
during the current critical section. */
extern int pending_atimers;
+
/* Begin critical section. */
#define BLOCK_INPUT (interrupt_input_blocked++)
} \
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 \
+ do if (interrupt_input_blocked != 0) \
+ { \
+ interrupt_input_blocked = 1; \
+ UNBLOCK_INPUT; \
+ } \
+ while (0)
+
+/* 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 \
+ { \
+ interrupt_input_blocked = (LEVEL) + 1; \
+ UNBLOCK_INPUT; \
+ } \
+ while (0)
+
#define UNBLOCK_INPUT_RESIGNAL UNBLOCK_INPUT
/* In critical section ? */
#define INPUT_BLOCKED_P (interrupt_input_blocked > 0)
/* Defined in keyboard.c */
-/* Don't use a prototype here; it causes trouble in some files. */
-extern void reinvoke_input_signal ();
+extern void reinvoke_input_signal (void);
#endif /* EMACS_BLOCKINPUT_H */
-/* arch-tag: 51a9ec86-945a-4966-8f04-2d1341250e03
- (do not change this comment) */