git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/allocators.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Libmemcached library
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker All rights reserved.
   7  *
   8  *  Redistribution and use in source and binary forms, with or without
   9  *  modification, are permitted provided that the following conditions are
  10  *  met:
  11  *
  12  *      * Redistributions of source code must retain the above copyright
  13  *  notice, this list of conditions and the following disclaimer.
  14  *
  15  *      * Redistributions in binary form must reproduce the above
  16  *  copyright notice, this list of conditions and the following disclaimer
  17  *  in the documentation and/or other materials provided with the
  18  *  distribution.
  19  *
  20  *      * The names of its contributors may not be used to endorse or
  21  *  promote products derived from this software without specific prior
  22  *  written permission.
  23  *
  24  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  26  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  27  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  28  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  29  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  30  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  34  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  */
  37
  38 #include <libmemcached/common.h>
  39
  40 void _libmemcached_free(const memcached_st*, void *mem, void*)
  41 {
  42   if (mem)
  43   {
  44     std::free(mem);
  45   }
  46 }
  47
  48 void *_libmemcached_malloc(const memcached_st *, size_t size, void *)
  49 {
  50   return std::malloc(size);
  51 }
  52
  53 void *_libmemcached_realloc(const memcached_st*, void *mem, size_t size, void *)
  54 {
  55   return std::realloc(mem, size);
  56 }
  57
  58 void *_libmemcached_calloc(const memcached_st *self, size_t nelem, size_t size, void *context)
  59 {
  60   if (self->allocators.malloc != _libmemcached_malloc)
  61   {
  62      void *ret= _libmemcached_malloc(self, nelem * size, context);
  63      if (ret)
  64      {
  65        memset(ret, 0, nelem * size);
  66      }
  67
  68      return ret;
  69   }
  70
  71   return std::calloc(nelem, size);
  72 }
  73
  74 struct memcached_allocator_t memcached_allocators_return_default(void)
  75 {
  76   static struct memcached_allocator_t global_default_allocator= { _libmemcached_calloc, _libmemcached_free, _libmemcached_malloc, _libmemcached_realloc, 0 };
  77   return global_default_allocator;
  78 }
  79
  80 memcached_return_t memcached_set_memory_allocators(memcached_st *self,
  81                                                    memcached_malloc_fn mem_malloc,
  82                                                    memcached_free_fn mem_free,
  83                                                    memcached_realloc_fn mem_realloc,
  84                                                    memcached_calloc_fn mem_calloc,
  85                                                    void *context)
  86 {
  87   if (self == NULL)
  88   {
  89     return MEMCACHED_INVALID_ARGUMENTS;
  90   }
  91
  92   /* All should be set, or none should be set */
  93   if (mem_malloc == NULL and mem_free == NULL and mem_realloc == NULL and mem_calloc == NULL)
  94   {
  95     self->allocators= memcached_allocators_return_default();
  96   }
  97   else if (mem_malloc == NULL or mem_free == NULL or mem_realloc == NULL or mem_calloc == NULL)
  98   {
  99     return memcached_set_error(*self, MEMCACHED_INVALID_ARGUMENTS, MEMCACHED_AT, memcached_literal_param("NULL parameter provided for one or more allocators"));
 100   }
 101   else
 102   {
 103     self->allocators.malloc= mem_malloc;
 104     self->allocators.free= mem_free;
 105     self->allocators.realloc= mem_realloc;
 106     self->allocators.calloc= mem_calloc;
 107     self->allocators.context= context;
 108   }
 109
 110   return MEMCACHED_SUCCESS;
 111 }
 112
 113 void *memcached_get_memory_allocators_context(const memcached_st *self)
 114 {
 115   return self->allocators.context;
 116 }
 117
 118 void memcached_get_memory_allocators(const memcached_st *self,
 119                                      memcached_malloc_fn *mem_malloc,
 120                                      memcached_free_fn *mem_free,
 121                                      memcached_realloc_fn *mem_realloc,
 122                                      memcached_calloc_fn *mem_calloc)
 123 {
 124   if (self == NULL)
 125   {
 126     return;
 127   }
 128
 129   if (mem_malloc)
 130   {
 131     *mem_malloc= self->allocators.malloc;
 132   }
 133
 134   if (mem_free)
 135   {
 136     *mem_free= self->allocators.free;
 137   }
 138
 139   if (mem_realloc)
 140   {
 141     *mem_realloc= self->allocators.realloc;
 142   }
 143
 144   if (mem_calloc)
 145   {
 146     *mem_calloc= self->allocators.calloc;
 147   }
 148 }