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intext.h
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1999-01-02
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64 lines
/* -*-C-*-
$Id: intext.h,v 1.5 1999/01/02 06:11:34 cph Exp $
Copyright (c) 1990-1999 Massachusetts Institute of Technology
This program 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 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef SCM_INTEXT_H
#define SCM_INTEXT_H
#include "ansidecl.h"
#include "dstack.h"
struct interruptable_extent
{
PTR position;
jmp_buf control_point;
int interrupted;
};
extern struct interruptable_extent * current_interruptable_extent;
extern void EXFUN (initialize_interruptable_extent, (void));
extern void EXFUN (reset_interruptable_extent, (void));
extern struct interruptable_extent * EXFUN
(enter_interruptable_extent, (void));
extern int EXFUN (enter_interruption_extent, (void));
extern void EXFUN (exit_interruption_extent, (void));
#define INTERRUPTABLE_EXTENT(result, expression) \
{ \
int saved_errno; \
struct interruptable_extent * INTERRUPTABLE_EXTENT_frame = \
(enter_interruptable_extent ()); \
if ((setjmp (INTERRUPTABLE_EXTENT_frame -> control_point)) == 0) \
{ \
current_interruptable_extent = INTERRUPTABLE_EXTENT_frame; \
(result) = (expression); \
} \
else \
{ \
errno = EINTR; \
(result) = (-1); \
} \
saved_errno = errno; \
dstack_set_position (current_interruptable_extent -> position); \
errno = saved_errno; \
}
#endif /* SCM_INTEXT_H */