/* Support for sbrk() regions.
Copyright 1992, 2000 Free Software Foundation, Inc.
- Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
+ Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com */
-This file is part of the GNU C Library.
+/* Copyright (c) 2010. The SimGrid Team.
+ * All rights reserved. */
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
-
-The GNU C 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
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
#include <unistd.h> /* Prototypes for sbrk (maybe) */
#include <string.h> /* Prototypes for memcpy, memmove, memset, etc */
+#include "xbt.h"
#include "mmprivate.h"
-static PTR sbrk_morecore PARAMS ((struct mdesc *, int));
+static void* sbrk_morecore (struct mdesc *mdp, int size);
#if NEED_DECLARATION_SBRK
-extern PTR sbrk PARAMS ((int));
+extern void* sbrk (int size);
#endif
/* The mmalloc() package can use a single implicit malloc descriptor
/* Use sbrk() to get more core. */
-static PTR
+static void*
sbrk_morecore (mdp, size)
struct mdesc *mdp;
int size;
{
- PTR result;
+ void* result;
- if ((result = sbrk (size)) == (PTR) -1)
+ if ((result = sbrk (size)) == (void*) -1)
{
result = NULL;
}
return (result);
}
-/* Initialize the default malloc descriptor if this is the first time
- a request has been made to use the default sbrk'd region.
-
- Since no alignment guarantees are made about the initial value returned
- by sbrk, test the initial value and (if necessary) sbrk enough additional
- memory to start off with alignment to BLOCKSIZE. We actually only need
- it aligned to an alignment suitable for any object, so this is overkill.
- But at most it wastes just part of one BLOCKSIZE chunk of memory and
- minimizes portability problems by avoiding us having to figure out
- what the actual minimal alignment is. The rest of the malloc code
- avoids this as well, by always aligning to the minimum of the requested
- size rounded up to a power of two, or to BLOCKSIZE.
-
- Note that we are going to use some memory starting at this initial sbrk
- address for the sbrk region malloc descriptor, which is a struct, so the
- base address must be suitably aligned. */
-
-struct mdesc *
-__mmalloc_sbrk_init ()
-{
- PTR base;
- unsigned int adj;
+#define HEAP_OFFSET 20480000 /* Safety gap from the heap's break address */
- base = sbrk (0);
- adj = RESIDUAL (base, BLOCKSIZE);
- if (adj != 0)
- {
- sbrk (BLOCKSIZE - adj);
- base = sbrk (0);
- }
- __mmalloc_default_mdp = (struct mdesc *) sbrk (sizeof (struct mdesc));
- memset ((char *) __mmalloc_default_mdp, 0, sizeof (struct mdesc));
- __mmalloc_default_mdp -> morecore = sbrk_morecore;
- __mmalloc_default_mdp -> base = base;
- __mmalloc_default_mdp -> breakval = __mmalloc_default_mdp -> top = sbrk (0);
- __mmalloc_default_mdp -> fd = -1;
- return (__mmalloc_default_mdp);
+void *mmalloc_get_default_md(void) {
+ return __mmalloc_default_mdp;
}
-
+/* Initialize the default malloc descriptor. */
+#include "xbt_modinter.h"
+void mmalloc_preinit(void) {
+ __mmalloc_default_mdp = mmalloc_attach(-1, (char *)sbrk(0) + HEAP_OFFSET);
+ xbt_assert(__mmalloc_default_mdp != NULL);
+}
+void mmalloc_postexit(void) {
+ /* Do not detach the default mdp or ldl won't be able to free the memory it allocated since we're in memory */
+ // mmalloc_detach(__mmalloc_default_mdp);
+}
