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
  33  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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     free(mem);
  44 }
  45
  46 void *_libmemcached_malloc(const memcached_st *, size_t size, void *)
  47 {
  48   return malloc(size);
  49 }
  50
  51 void *_libmemcached_realloc(const memcached_st*, void *mem, size_t size, void *)
  52 {
  53   return realloc(mem, size);
  54 }
  55
  56 void *_libmemcached_calloc(const memcached_st *self, size_t nelem, size_t size, void *context)
  57 {
  58   if (self->allocators.malloc != _libmemcached_malloc)
  59   {
  60      void *ret = _libmemcached_malloc(self, nelem * size, context);
  61      if (not ret)
  62        memset(ret, 0, nelem * size);
  63
  64      return ret;
  65   }
  66
  67   return calloc(nelem, size);
  68 }
  69
  70 struct memcached_allocator_t memcached_allocators_return_default(void)
  71 {
  72   static struct memcached_allocator_t global_default_allocator= { _libmemcached_calloc, _libmemcached_free, _libmemcached_malloc, _libmemcached_realloc, 0 };
  73   return global_default_allocator;
  74 }
  75
  76 memcached_return_t memcached_set_memory_allocators(memcached_st *self,
  77                                                    memcached_malloc_fn mem_malloc,
  78                                                    memcached_free_fn mem_free,
  79                                                    memcached_realloc_fn mem_realloc,
  80                                                    memcached_calloc_fn mem_calloc,
  81                                                    void *context)
  82 {
  83   /* All should be set, or none should be set */
  84   if (mem_malloc == NULL && mem_free == NULL && mem_realloc == NULL && mem_calloc == NULL)
  85   {
  86     self->allocators= memcached_allocators_return_default();
  87   }
  88   else if (mem_malloc == NULL || mem_free == NULL || mem_realloc == NULL || mem_calloc == NULL)
  89   {
  90     return MEMCACHED_FAILURE;
  91   }
  92   else
  93   {
  94     self->allocators.malloc= mem_malloc;
  95     self->allocators.free= mem_free;
  96     self->allocators.realloc= mem_realloc;
  97     self->allocators.calloc= mem_calloc;
  98     self->allocators.context= context;
  99   }
 100
 101   return MEMCACHED_SUCCESS;
 102 }
 103
 104 void *memcached_get_memory_allocators_context(const memcached_st *self)
 105 {
 106   return self->allocators.context;
 107 }
 108
 109 void memcached_get_memory_allocators(const memcached_st *self,
 110                                      memcached_malloc_fn *mem_malloc,
 111                                      memcached_free_fn *mem_free,
 112                                      memcached_realloc_fn *mem_realloc,
 113                                      memcached_calloc_fn *mem_calloc)
 114 {
 115   *mem_malloc= self->allocators.malloc;
 116   *mem_free= self->allocators.free;
 117   *mem_realloc= self->allocators.realloc;
 118   *mem_calloc= self->allocators.calloc;
 119 }