1 /* Copyright (c) 2010. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 /* Redefine the classical malloc/free/realloc functions so that they fit well in the mmalloc framework */
11 static void *__mmalloc_current_heap = NULL; /* The heap we are currently using. */
13 #include "xbt_modinter.h"
15 void *mmalloc_get_current_heap(void)
17 return __mmalloc_current_heap;
20 void mmalloc_set_current_heap(void *new_heap)
22 __mmalloc_current_heap = new_heap;
25 #ifdef MMALLOC_WANT_OVERIDE_LEGACY
26 void *malloc(size_t n)
29 if (!__mmalloc_current_heap)
32 LOCK(__mmalloc_current_heap);
33 void *ret = mmalloc(__mmalloc_current_heap, n);
34 UNLOCK(__mmalloc_current_heap);
39 void *calloc(size_t nmemb, size_t size)
41 size_t total_size = nmemb * size;
43 if (!__mmalloc_current_heap)
46 LOCK(__mmalloc_current_heap);
47 void *ret = mmalloc(__mmalloc_current_heap, total_size);
48 UNLOCK(__mmalloc_current_heap);
50 /* Fill the allocated memory with zeroes to mimic calloc behaviour */
51 memset(ret, '\0', total_size);
56 void *realloc(void *p, size_t s)
60 if (!__mmalloc_current_heap)
63 LOCK(__mmalloc_current_heap);
66 ret = mrealloc(__mmalloc_current_heap, p, s);
68 ret = mmalloc(__mmalloc_current_heap, s);
71 mfree(__mmalloc_current_heap, p);
73 UNLOCK(__mmalloc_current_heap);
80 LOCK(__mmalloc_current_heap);
81 mfree(__mmalloc_current_heap, p);
82 UNLOCK(__mmalloc_current_heap);
86 /* Make sure it works with md==NULL */
88 #define HEAP_OFFSET (128<<20) /* Safety gap from the heap's break address.
89 * Try to increase this first if you experience
90 * strange errors under valgrind. */
92 void *mmalloc_get_default_md(void)
94 xbt_assert(__mmalloc_default_mdp);
95 return __mmalloc_default_mdp;
98 static void mmalloc_fork_prepare(void)
100 if (__mmalloc_default_mdp)
101 LOCK(__mmalloc_default_mdp);
104 static void mmalloc_fork_finish(void)
106 if (__mmalloc_default_mdp)
107 UNLOCK(__mmalloc_default_mdp);
110 /* Initialize the default malloc descriptor. */
111 void mmalloc_preinit(void)
113 if (!__mmalloc_default_mdp) {
114 __mmalloc_default_mdp =
115 mmalloc_attach(-1, (char *) sbrk(0) + HEAP_OFFSET);
116 /* Fixme? only the default mdp in protected against forks */
117 if (xbt_os_thread_atfork(mmalloc_fork_prepare,
118 mmalloc_fork_finish, mmalloc_fork_finish) != 0)
121 xbt_assert(__mmalloc_default_mdp != NULL);
124 void mmalloc_postexit(void)
126 /* Do not detach the default mdp or ldl won't be able to free the memory it allocated since we're in memory */
127 // mmalloc_detach(__mmalloc_default_mdp);
128 mmalloc_pre_detach(__mmalloc_default_mdp);