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 <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <pthread.h>
  35 #include "config.h"
  36
  37 #if defined(__sun)
  38 #define PREFIX_SIZE sizeof(long long)
  39 #else
  40 #define PREFIX_SIZE sizeof(size_t)
  41 #endif
  42
  43 static size_t used_memory = 0;
  44 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
  45
  46 static void zmalloc_oom(size_t size) {
  47     fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
  48         size);
  49     fflush(stderr);
  50     abort();
  51 }
  52
  53 void *zmalloc(size_t size) {
  54     void *ptr = malloc(size+PREFIX_SIZE);
  55
  56     if (!ptr) zmalloc_oom(size);
  57 #ifdef HAVE_MALLOC_SIZE
  58     used_memory += redis_malloc_size(ptr);
  59     return ptr;
  60 #else
  61     *((size_t*)ptr) = size;
  62     used_memory += size+PREFIX_SIZE;
  63     return (char*)ptr+PREFIX_SIZE;
  64 #endif
  65 }
  66
  67 void *zrealloc(void *ptr, size_t size) {
  68 #ifndef HAVE_MALLOC_SIZE
  69     void *realptr;
  70 #endif
  71     size_t oldsize;
  72     void *newptr;
  73
  74     if (ptr == NULL) return zmalloc(size);
  75 #ifdef HAVE_MALLOC_SIZE
  76     oldsize = redis_malloc_size(ptr);
  77     newptr = realloc(ptr,size);
  78     if (!newptr) zmalloc_oom(size);
  79
  80     used_memory -= oldsize;
  81     used_memory += redis_malloc_size(newptr);
  82     return newptr;
  83 #else
  84     realptr = (char*)ptr-PREFIX_SIZE;
  85     oldsize = *((size_t*)realptr);
  86     newptr = realloc(realptr,size+PREFIX_SIZE);
  87     if (!newptr) zmalloc_oom(size);
  88
  89     *((size_t*)newptr) = size;
  90     used_memory -= oldsize;
  91     used_memory += size;
  92     return (char*)newptr+PREFIX_SIZE;
  93 #endif
  94 }
  95
  96 void zfree(void *ptr) {
  97 #ifndef HAVE_MALLOC_SIZE
  98     void *realptr;
  99     size_t oldsize;
 100 #endif
 101
 102     if (ptr == NULL) return;
 103 #ifdef HAVE_MALLOC_SIZE
 104     used_memory -= redis_malloc_size(ptr);
 105     free(ptr);
 106 #else
 107     realptr = (char*)ptr-PREFIX_SIZE;
 108     oldsize = *((size_t*)realptr);
 109     used_memory -= oldsize+PREFIX_SIZE;
 110     free(realptr);
 111 #endif
 112 }
 113
 114 char *zstrdup(const char *s) {
 115     size_t l = strlen(s)+1;
 116     char *p = zmalloc(l);
 117
 118     memcpy(p,s,l);
 119     return p;
 120 }
 121
 122 size_t zmalloc_used_memory(void) {
 123     return used_memory;
 124 }