/* Functions for memory limit warnings.
- Copyright (C) 1990, 1992, 2001, 2002, 2003, 2004,
- 2005, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1990, 1992, 2001-2013 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., 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
+along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef emacs
#include <config.h>
+#include <unistd.h> /* for 'environ', on AIX */
#include "lisp.h"
-#endif
-
-#ifndef emacs
-#include <stddef.h>
-typedef size_t SIZE;
-typedef void *POINTER;
-#define EXCEEDS_LISP_PTR(x) 0
-#endif
-
#include "mem-limits.h"
-#ifdef HAVE_GETRLIMIT
-#include <sys/resource.h>
-#endif
-
/*
Level number of warnings already issued.
0 -- no warnings issued.
3 -- 95% warning issued; keep warning frequently.
*/
enum warnlevel { not_warned, warned_75, warned_85, warned_95 };
-
static enum warnlevel warnlevel;
+typedef void *POINTER;
+
/* Function to call to issue a warning;
0 means don't issue them. */
-static void (*warn_function) ();
+static void (*warn_function) (const char *);
/* Start of data space; can be changed by calling malloc_init. */
static POINTER data_space_start;
/* Number of bytes of writable memory we can expect to be able to get. */
-static unsigned long lim_data;
+static size_t lim_data;
\f
-#ifdef NO_LIM_DATA
+#if defined (HAVE_GETRLIMIT) && defined (RLIMIT_AS)
static void
-get_lim_data ()
+get_lim_data (void)
{
- lim_data = -1;
+ struct rlimit rlimit;
+
+ getrlimit (RLIMIT_AS, &rlimit);
+ if (rlimit.rlim_cur == RLIM_INFINITY)
+ lim_data = -1;
+ else
+ lim_data = rlimit.rlim_cur;
}
-#else /* not NO_LIM_DATA */
+
+#else /* not HAVE_GETRLIMIT */
#ifdef USG
static void
-get_lim_data ()
+get_lim_data (void)
{
extern long ulimit ();
#else /* not USG */
#ifdef WINDOWSNT
+#include "w32heap.h"
+
static void
-get_lim_data ()
+get_lim_data (void)
{
- extern unsigned long reserved_heap_size;
+ extern size_t reserved_heap_size;
lim_data = reserved_heap_size;
}
#else
-#if !defined (BSD4_2) && !defined (__osf__)
+#if !defined (BSD4_2) && !defined (CYGWIN)
#ifdef MSDOS
void
-get_lim_data ()
+get_lim_data (void)
{
_go32_dpmi_meminfo info;
+ unsigned long lim1, lim2;
_go32_dpmi_get_free_memory_information (&info);
- lim_data = info.available_memory;
+ /* DPMI server of Windows NT and its descendants reports in
+ info.available_memory a much lower amount that is really
+ available, which causes bogus "past 95% of memory limit"
+ warnings. Try to overcome that via circumstantial evidence. */
+ lim1 = info.available_memory;
+ lim2 = info.available_physical_pages;
+ /* DPMI Spec: "Fields that are unavailable will hold -1." */
+ if ((long)lim1 == -1L)
+ lim1 = 0;
+ if ((long)lim2 == -1L)
+ lim2 = 0;
+ else
+ lim2 *= 4096;
+ /* Surely, the available memory is at least what we have physically
+ available, right? */
+ if (lim1 >= lim2)
+ lim_data = lim1;
+ else
+ lim_data = lim2;
+ /* Don't believe they will give us more that 0.5 GB. */
+ if (lim_data > 512U * 1024U * 1024U)
+ lim_data = 512U * 1024U * 1024U;
+}
+
+unsigned long
+ret_lim_data (void)
+{
+ get_lim_data ();
+ return lim_data;
}
#else /* not MSDOS */
static void
-get_lim_data ()
+get_lim_data (void)
{
lim_data = vlimit (LIM_DATA, -1);
}
#endif /* not MSDOS */
-#else /* BSD4_2 */
+#else /* BSD4_2 || CYGWIN */
static void
-get_lim_data ()
+get_lim_data (void)
{
struct rlimit XXrlimit;
#endif /* BSD4_2 */
#endif /* not WINDOWSNT */
#endif /* not USG */
-#endif /* not NO_LIM_DATA */
+#endif /* not HAVE_GETRLIMIT */
\f
/* Verify amount of memory available, complaining if we're near the end. */
static void
-check_memory_limits ()
+check_memory_limits (void)
{
#ifdef REL_ALLOC
- extern POINTER (*real_morecore) ();
+ extern POINTER (*real_morecore) (ptrdiff_t);
#endif
- extern POINTER (*__morecore) ();
-
+ extern POINTER (*__morecore) (ptrdiff_t);
register POINTER cp;
- unsigned long five_percent;
- unsigned long data_size;
+ size_t five_percent;
+ size_t data_size;
enum warnlevel new_warnlevel;
-#ifdef HAVE_GETRLIMIT
- struct rlimit rlimit;
-
- getrlimit (RLIMIT_AS, &rlimit);
-
- if (RLIM_INFINITY == rlimit.rlim_max)
- return;
-
- /* This is a nonsensical case, but it happens -- rms. */
- if (rlimit.rlim_cur > rlimit.rlim_max)
- return;
-
- five_percent = rlimit.rlim_max / 20;
- data_size = rlimit.rlim_cur;
-
-#else /* not HAVE_GETRLIMIT */
-
if (lim_data == 0)
get_lim_data ();
five_percent = lim_data / 20;
cp = (char *) (*__morecore) (0);
data_size = (char *) cp - (char *) data_space_start;
-#endif /* not HAVE_GETRLIMIT */
-
if (!warn_function)
return;
/* What level of warning does current memory usage demand? */
- if (data_size > five_percent * 19)
- new_warnlevel = warned_95;
- else if (data_size > five_percent * 17)
- new_warnlevel = warned_85;
- else if (data_size > five_percent * 15)
- new_warnlevel = warned_75;
- else
- new_warnlevel = not_warned;
+ new_warnlevel
+ = (data_size > five_percent * 19) ? warned_95
+ : (data_size > five_percent * 17) ? warned_85
+ : (data_size > five_percent * 15) ? warned_75
+ : not_warned;
/* If we have gone up a level, give the appropriate warning. */
if (new_warnlevel > warnlevel || new_warnlevel == warned_95)
(*warn_function) ("Warning: memory in use exceeds lisp pointer size");
}
\f
+#if !defined (CANNOT_DUMP) || !defined (SYSTEM_MALLOC)
+/* Some systems that cannot dump also cannot implement these. */
+
+/*
+ * Return the address of the start of the data segment prior to
+ * doing an unexec. After unexec the return value is undefined.
+ * See crt0.c for further information and definition of data_start.
+ *
+ * Apparently, on BSD systems this is etext at startup. On
+ * USG systems (swapping) this is highly mmu dependent and
+ * is also dependent on whether or not the program is running
+ * with shared text. Generally there is a (possibly large)
+ * gap between end of text and start of data with shared text.
+ *
+ */
+
+char *
+start_of_data (void)
+{
+#ifdef BSD_SYSTEM
+ extern char etext;
+ return (POINTER)(&etext);
+#elif defined DATA_START
+ return ((POINTER) DATA_START);
+#elif defined ORDINARY_LINK
+ /*
+ * This is a hack. Since we're not linking crt0.c or pre_crt0.c,
+ * data_start isn't defined. We take the address of environ, which
+ * is known to live at or near the start of the system crt0.c, and
+ * we don't sweat the handful of bytes that might lose.
+ */
+ return ((POINTER) &environ);
+#else
+ extern int data_start;
+ return ((POINTER) &data_start);
+#endif
+}
+#endif /* (not CANNOT_DUMP or not SYSTEM_MALLOC) */
+\f
/* Enable memory usage warnings.
START says where the end of pure storage is.
WARNFUN specifies the function to call to issue a warning. */
void
-memory_warnings (start, warnfun)
- POINTER start;
- void (*warnfun) ();
+memory_warnings (POINTER start, void (*warnfun) (const char *))
{
- extern void (* __after_morecore_hook) (); /* From gmalloc.c */
+ extern void (* __after_morecore_hook) (void); /* From gmalloc.c */
if (start)
data_space_start = start;
/* Force data limit to be recalculated on each run. */
lim_data = 0;
}
-
-/* arch-tag: eab04eda-1f69-447a-8d9f-95f0a3983ca5
- (do not change this comment) */