-/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
*
- * 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, or (at your option)
- * any later version.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This library 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
#include <stdio.h>
#include <errno.h>
#include <string.h>
static int scm_i_minyield_malloc;
-static scm_t_mutex malloc_mutex;
-
-void
-scm_gc_malloc_prehistory ()
-{
- scm_i_plugin_mutex_init (&malloc_mutex, 0);
-}
-
void
scm_gc_init_malloc (void)
{
scm_mtrigger = scm_getenv_int ("GUILE_INIT_MALLOC_LIMIT",
SCM_DEFAULT_INIT_MALLOC_LIMIT);
- scm_i_minyield_malloc = scm_getenv_int ("GUILE_MIN_YIELD_MALLOC",
- SCM_DEFAULT_MALLOC_MINYIELD);
+ scm_i_minyield_malloc = scm_getenv_int ("GUILE_MIN_YIELD_MALLOC",
+ SCM_DEFAULT_MALLOC_MINYIELD);
if (scm_i_minyield_malloc >= 100)
scm_i_minyield_malloc = 99;
{
void *ptr;
- scm_i_plugin_mutex_lock (&malloc_mutex);
SCM_SYSCALL (ptr = realloc (mem, size));
- scm_i_plugin_mutex_unlock (&malloc_mutex);
if (ptr)
return ptr;
- scm_i_thread_put_to_sleep ();
-
- scm_i_sweep_all_segments ("realloc");
-
- scm_i_plugin_mutex_lock (&malloc_mutex);
- SCM_SYSCALL (ptr = realloc (mem, size));
- scm_i_plugin_mutex_unlock (&malloc_mutex);
- if (ptr)
- {
- scm_i_thread_wake_up ();
- return ptr;
- }
+ scm_i_scm_pthread_mutex_lock (&scm_i_sweep_mutex);
+ scm_gc_running_p = 1;
- scm_igc ("realloc");
- scm_i_sweep_all_segments ("realloc");
-
- scm_i_thread_wake_up ();
+ scm_i_gc ("realloc");
+
+ /*
+ We don't want these sweep statistics to influence results for
+ cell GC, so we don't collect statistics.
+
+ realloc () failed, so we're really desparate to free memory. Run a
+ full sweep.
+ */
+ scm_i_sweep_all_segments ("realloc", NULL);
+
+ scm_gc_running_p = 0;
+ scm_i_pthread_mutex_unlock (&scm_i_sweep_mutex);
- scm_i_plugin_mutex_lock (&malloc_mutex);
SCM_SYSCALL (ptr = realloc (mem, size));
- scm_i_plugin_mutex_unlock (&malloc_mutex);
if (ptr)
return ptr;
By default, try to use calloc, as it is likely more efficient than
calling memset by hand.
*/
- scm_i_plugin_mutex_lock (&malloc_mutex);
- SCM_SYSCALL(ptr= calloc (sz, 1));
- scm_i_plugin_mutex_unlock (&malloc_mutex);
+ SCM_SYSCALL (ptr = calloc (sz, 1));
if (ptr)
return ptr;
char *
scm_strndup (const char *str, size_t n)
{
- char *dst = scm_malloc (n+1);
+ char *dst = scm_malloc (n + 1);
memcpy (dst, str, n);
dst[n] = 0;
return dst;
return scm_strndup (str, strlen (str));
}
-void
-scm_gc_register_collectable_memory (void *mem, size_t size, const char *what)
+static void
+decrease_mtrigger (size_t size, const char * what)
{
- scm_mallocated += size;
+ scm_i_pthread_mutex_lock (&scm_i_gc_admin_mutex);
- /*
- we could finish the full sweep (without mark) here, but in
- practice this turns out to be ineffective.
- */
+ if (size > scm_mallocated)
+ {
+ fprintf (stderr, "`scm_mallocated' underflow. This means that more "
+ "memory was unregistered\n"
+ "via `scm_gc_unregister_collectable_memory ()' than "
+ "registered.\n");
+ abort ();
+ }
+
+ scm_mallocated -= size;
+ scm_gc_malloc_collected += size;
+ scm_i_pthread_mutex_unlock (&scm_i_gc_admin_mutex);
+}
+
+static void
+increase_mtrigger (size_t size, const char *what)
+{
+ size_t mallocated = 0;
+ int overflow = 0, triggered = 0;
+
+ scm_i_pthread_mutex_lock (&scm_i_gc_admin_mutex);
+ if (ULONG_MAX - size < scm_mallocated)
+ overflow = 1;
+ else
+ {
+ scm_mallocated += size;
+ mallocated = scm_mallocated;
+ if (scm_mallocated > scm_mtrigger)
+ triggered = 1;
+ }
+ scm_i_pthread_mutex_unlock (&scm_i_gc_admin_mutex);
+
+ if (overflow)
+ scm_memory_error ("Overflow of scm_mallocated: too much memory in use.");
/*
A program that uses a lot of malloced collectable memory (vectors,
do GC more often (before cells are exhausted), otherwise swapping
and malloc management will tie it down.
*/
- if (scm_mallocated > scm_mtrigger)
+ if (triggered)
{
unsigned long prev_alloced;
float yield;
+
+ scm_i_scm_pthread_mutex_lock (&scm_i_sweep_mutex);
+ scm_gc_running_p = 1;
- scm_i_thread_put_to_sleep ();
-
- prev_alloced = scm_mallocated;
- scm_igc (what);
- scm_i_sweep_all_segments ("mtrigger");
+ prev_alloced = mallocated;
+
+ /* The GC will finish the pending sweep. For that reason, we
+ don't execute a complete sweep after GC, although that might
+ free some more memory.
+ */
+ scm_i_gc (what);
- yield = ((float)prev_alloced - (float) scm_mallocated)
- / (float) prev_alloced;
+ yield = (((float) prev_alloced - (float) scm_mallocated)
+ / (float) prev_alloced);
- scm_gc_malloc_yield_percentage = (int) (100 * yield);
+ scm_gc_malloc_yield_percentage = (int) (100 * yield);
#ifdef DEBUGINFO
fprintf (stderr, "prev %lud , now %lud, yield %4.2lf, want %d",
- prev_alloced, scm_mallocated, 100.0*yield, scm_i_minyield_malloc);
+ prev_alloced,
+ scm_mallocated,
+ 100.0 * yield,
+ scm_i_minyield_malloc);
#endif
if (yield < scm_i_minyield_malloc / 100.0)
float no_overflow_trigger = scm_mallocated * 110.0;
no_overflow_trigger /= (float) (100.0 - scm_i_minyield_malloc);
- scm_mtrigger = (unsigned long) no_overflow_trigger;
+
+
+ if (no_overflow_trigger >= (float) ULONG_MAX)
+ scm_mtrigger = ULONG_MAX;
+ else
+ scm_mtrigger = (unsigned long) no_overflow_trigger;
#ifdef DEBUGINFO
- fprintf (stderr, "Mtrigger sweep: ineffective. New trigger %d\n", scm_mtrigger);
+ fprintf (stderr, "Mtrigger sweep: ineffective. New trigger %d\n",
+ scm_mtrigger);
#endif
}
-
- scm_i_thread_wake_up ();
+
+ scm_gc_running_p = 0;
+ scm_i_pthread_mutex_unlock (&scm_i_sweep_mutex);
}
-
+}
+
+void
+scm_gc_register_collectable_memory (void *mem, size_t size, const char *what)
+{
+ increase_mtrigger (size, what);
#ifdef GUILE_DEBUG_MALLOC
if (mem)
scm_malloc_register (mem, what);
#endif
}
+
void
scm_gc_unregister_collectable_memory (void *mem, size_t size, const char *what)
{
- scm_mallocated -= size;
- scm_gc_malloc_collected += size;
-
+ decrease_mtrigger (size, what);
#ifdef GUILE_DEBUG_MALLOC
if (mem)
scm_malloc_unregister (mem);
again in scm_gc_register_collectable_memory. We don't really
want the second GC since it will not find new garbage.
-
- Note: this is a theoretical peeve. In reality, malloc() never
+ Note: this is a theoretical peeve. In reality, malloc () never
returns NULL. Usually, memory is overcommitted, and when you try
to write it the program is killed with signal 11. --hwn
*/
- void *ptr = scm_malloc (size);
+ void *ptr = size ? scm_malloc (size) : NULL;
scm_gc_register_collectable_memory (ptr, size, what);
return ptr;
}
void *
scm_gc_realloc (void *mem, size_t old_size, size_t new_size, const char *what)
{
+ void *ptr;
+
/* XXX - see scm_gc_malloc. */
- void *ptr = scm_realloc (mem, new_size);
- scm_gc_unregister_collectable_memory (mem, old_size, what);
- scm_gc_register_collectable_memory (ptr, new_size, what);
+
+ /*
+ scm_realloc () may invalidate the block pointed to by WHERE, eg. by
+ unmapping it from memory or altering the contents. Since
+ increase_mtrigger () might trigger a GC that would scan
+ MEM, it is crucial that this call precedes realloc ().
+ */
+
+ decrease_mtrigger (old_size, what);
+ increase_mtrigger (new_size, what);
+
+ ptr = scm_realloc (mem, new_size);
+
+#ifdef GUILE_DEBUG_MALLOC
+ if (mem)
+ scm_malloc_reregister (mem, ptr, what);
+#endif
+
return ptr;
}
scm_gc_free (void *mem, size_t size, const char *what)
{
scm_gc_unregister_collectable_memory (mem, size, what);
- free (mem);
+ if (mem)
+ free (mem);
}
char *
("scm_done_malloc is deprecated. "
"Use scm_gc_register_collectable_memory instead.");
- scm_gc_register_collectable_memory (NULL, size, "foreign mallocs");
+ if (size >= 0)
+ scm_gc_register_collectable_memory (NULL, size, "foreign mallocs");
+ else
+ scm_gc_unregister_collectable_memory (NULL, -size, "foreign mallocs");
}
void
("scm_done_free is deprecated. "
"Use scm_gc_unregister_collectable_memory instead.");
- scm_gc_unregister_collectable_memory (NULL, size, "foreign mallocs");
+ if (size >= 0)
+ scm_gc_unregister_collectable_memory (NULL, size, "foreign mallocs");
+ else
+ scm_gc_register_collectable_memory (NULL, -size, "foreign mallocs");
}
#endif /* SCM_ENABLE_DEPRECATED == 1 */
HCoop / bpt / guile.git / blobdiff