/* Functions for memory limit warnings.
Copyright (C) 1990, 1992 Free Software Foundation, Inc.
This file is part of XEmacs.
XEmacs 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 3 of the License, or (at your
option) any later version.
XEmacs 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 XEmacs. If not, see . */
/* Synched up with: FSF 19.30. */
#ifdef emacs
#include
#include "lisp.h"
#endif
#include
#ifndef emacs
typedef size_t SIZE;
typedef void *POINTER;
#define EXCEEDS_LISP_PTR(x) 0
#endif
#include "mem-limits.h"
#ifndef _NO_MALLOC_WARNING_
/*
Level number of warnings already issued.
0 -- no warnings issued.
1 -- 75% warning already issued.
2 -- 85% warning already issued.
3 -- 95% warning issued; keep warning frequently.
*/
static int warnlevel;
/* Function to call to issue a warning;
0 means don't issue them. */
static void (*warn_function) (const char *);
/* Get more memory space, complaining if we're near the end. */
static void
check_memory_limits (void)
{
extern POINTER (*__morecore) (ptrdiff_t size);
POINTER cp;
unsigned long five_percent;
unsigned long data_size;
void (*save_warn_fun) (const char *);
if (lim_data == 0)
get_lim_data ();
five_percent = lim_data / 20;
/* Find current end of memory and issue warning if getting near max */
cp = (char *) (*__morecore) (0);
data_size = (char *) cp - (char *) data_space_start;
if (warn_function)
{
/* temporarily reset the warn_function to 0 or we will get infinite
looping. */
save_warn_fun = warn_function;
warn_function = 0;
switch (warnlevel)
{
case 0:
if (data_size > five_percent * 15)
{
warnlevel++;
(*save_warn_fun) ("Warning: past 75% of memory limit");
}
break;
case 1:
if (data_size > five_percent * 17)
{
warnlevel++;
(*save_warn_fun) ("Warning: past 85% of memory limit");
}
break;
case 2:
if (data_size > five_percent * 19)
{
warnlevel++;
(*save_warn_fun) ("Warning: past 95% of memory limit");
}
break;
default:
(*save_warn_fun) ("Warning: past acceptable memory limits");
break;
}
warn_function = save_warn_fun;
}
/* If we go down below 70% full, issue another 75% warning
when we go up again. */
if (data_size < five_percent * 14)
warnlevel = 0;
/* If we go down below 80% full, issue another 85% warning
when we go up again. */
else if (warnlevel > 1 && data_size < five_percent * 16)
warnlevel = 1;
/* If we go down below 90% full, issue another 95% warning
when we go up again. */
else if (warnlevel > 2 && data_size < five_percent * 18)
warnlevel = 2;
if (EXCEEDS_LISP_PTR (cp))
{
if (warn_function)
{
/* temporarily reset the warn_function to 0 or we will get infinite
looping. */
save_warn_fun = warn_function;
warn_function = 0;
(*save_warn_fun)
("Warning: memory in use exceeds lisp pointer size");
warn_function = save_warn_fun;
}
}
}
#endif /* not _NO_MALLOC_WARNING_ */
/* Cause reinitialization based on job parameters;
also declare where the end of pure storage is. */
void
memory_warnings (void *start,
#ifdef _NO_MALLOC_WARNING_
void (*UNUSED_ARG (warnfun)) (const char *) ATTRIBUTE_UNUSED
#else
void (*warnfun) (const char *)
#endif
)
{
#ifndef _NO_MALLOC_WARNING_
extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
#endif
if (start)
data_space_start = (char*) start;
else
data_space_start = start_of_data ();
#ifndef _NO_MALLOC_WARNING_
warn_function = warnfun;
__after_morecore_hook = check_memory_limits;
#endif
}