zmalloc.c

   1 /* zmalloc - total amount of allocated memory aware version of malloc()
   2  *
   3  * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include <stdlib.h>
  32 #include <string.h>
  33
  34 #ifdef __APPLE__
  35 #include <malloc/malloc.h>
  36 #define HAVE_MALLOC_SIZE
  37 #define redis_malloc_size(p) malloc_size(p)
  38 #endif
  39
  40 static size_t used_memory = 0;
  41
  42 void *zmalloc(size_t size) {
  43     void *ptr = malloc(size+sizeof(size_t));
  44
  45     if (!ptr) return NULL;
  46 #ifdef HAVE_MALLOC_SIZE
  47     used_memory += redis_malloc_size(ptr);
  48     return ptr;
  49 #else
  50     *((size_t*)ptr) = size;
  51     used_memory += size+sizeof(size_t);
  52     return (char*)ptr+sizeof(size_t);
  53 #endif
  54 }
  55
  56 void *zrealloc(void *ptr, size_t size) {
  57 #ifndef HAVE_MALLOC_SIZE
  58     void *realptr;
  59 #endif
  60     size_t oldsize;
  61     void *newptr;
  62
  63     if (ptr == NULL) return zmalloc(size);
  64 #ifdef HAVE_MALLOC_SIZE
  65     oldsize = redis_malloc_size(ptr);
  66     newptr = realloc(ptr,size);
  67     if (!newptr) return NULL;
  68
  69     used_memory -= oldsize;
  70     used_memory += redis_malloc_size(newptr);
  71     return newptr;
  72 #else
  73     realptr = (char*)ptr-sizeof(size_t);
  74     oldsize = *((size_t*)realptr);
  75     newptr = realloc(realptr,size+sizeof(size_t));
  76     if (!newptr) return NULL;
  77
  78     *((size_t*)newptr) = size;
  79     used_memory -= oldsize;
  80     used_memory += size;
  81     return (char*)newptr+sizeof(size_t);
  82 #endif
  83 }
  84
  85 void zfree(void *ptr) {
  86 #ifndef HAVE_MALLOC_SIZE
  87     void *realptr;
  88     size_t oldsize;
  89 #endif
  90
  91     if (ptr == NULL) return;
  92 #ifdef HAVE_MALLOC_SIZE
  93     used_memory -= redis_malloc_size(ptr);
  94     free(ptr);
  95 #else
  96     realptr = (char*)ptr-sizeof(size_t);
  97     oldsize = *((size_t*)realptr);
  98     used_memory -= oldsize+sizeof(size_t);
  99     free(realptr);
 100 #endif
 101 }
 102
 103 char *zstrdup(const char *s) {
 104     size_t l = strlen(s)+1;
 105     char *p = zmalloc(l);
 106
 107     memcpy(p,s,l);
 108     return p;
 109 }
 110
 111 size_t zmalloc_used_memory(void) {
 112     return used_memory;
 113 }